From: krnet-bounces@mylist.net To: John Bouyea Subject: KRnet Digest, Vol 347, Issue 94 Date: 3/6/2005 9:02:33 PM Send KRnet mailing list submissions to krnet@mylist.net To subscribe or unsubscribe via the World Wide Web, visit http://mylist.net/listinfo/krnet or, via email, send a message with subject or body 'help' to krnet-request@mylist.net You can reach the person managing the list at krnet-owner@mylist.net When replying, please edit your Subject line so it is more specific than "Re: Contents of KRnet digest..." Today's Topics: 1. Re: teeny weeny project update (Glasseyegav) 2. Re: teeny weeny project update (Mark Langford) 3. RE: teeny weeny project update (Brian Kraut) 4. emag electronic ignition (Don Chisholm) 5. Stainless Steel on Firewall (raybeth123@sbcglobal.net) 6. Re: project update suggestions/questions (Scott Cable) 7. Re: project update suggestions/questions (Bubba) 8. Re: teeny weeny project update (Glasseyegav) 9. Re: Stainless Steel on Firewall (Mark Jones) 10. W & B and other progress (Dan Heath) 11. Link to the W & B Sheet. I forgot to include it. (Dan Heath) 12. Re: W & B and other progress (Mark Jones) 13. Re: W & B and other progress (Dan Heath) 14. Link to Sheet (Dan Heath) 15. Re: W & B and other progress (Mark Jones) 16. Re: Link to Sheet (Barry Kruyssen) 17. Gauge (Colin & Bev Rainey) 18. Fuel gauge not working. (Dan Heath) 19. Re: Fuel gauge not working. (larry severson) 20. Re: project update suggestions/questions (Mark Langford) 21. Re: teeny weeny project update (Barry Kruyssen) ---------------------------------------------------------------------- Message: 1 Date: Sun, 6 Mar 2005 17:26:08 +1000 From: "Glasseyegav" Subject: Re: KR> teeny weeny project update To: "KRnet" Message-ID: <001c01c5221d$c3d158c0$0100000a@vic.bigpond.net.au> Content-Type: text/plain; charset="iso-8859-1" Hi Mark Am I to understand that you plan to go without a carb heat cable and allow full automatic operation operated by ram pressure alone?? Gav . Carb heat > valve and ram air valve are both cable actuated, but next time I'll > make the > carb heat a weighted affair, so when ram air is on, carb heat will be > off because the ram pressure and a little more weight will force it > closed (it's > on sintered bearings and flops around nicely), and when ram air is > off, carb > heat will automatically be on because the engine is sucking on it. I think > it would work that way now, if I didn't have a cable connected to it, > but I > could tweak the design to make sure it worked as expected. I get > smarter after I build something that's almost right! > ------------------------------ Message: 2 Date: Sun, 6 Mar 2005 10:51:40 -0600 From: "Mark Langford" Subject: Re: KR> teeny weeny project update To: "KRnet" Message-ID: <002701c5226c$c4f91e00$1202a8c0@1700xp> Content-Type: text/plain; charset="iso-8859-1" Gav wrote: >Am I to understand that you plan to go without a carb heat cable and >allow full automatic operation operated by ram pressure alone?? Right now it's not, but when I build the next one it will be that way. The carb heat valve flapper is a nice tight fit, but swings freely. The flapper is stainless steel, so is heavy enough to always return to the closed position with no other influence (it's supported on oil impregnated sintered bronze bushings. The way it is now, I could shut off both ram air and carb heat air, and starve the engine for air, which would not be good. I did a web page for it this morning, so see http://home.hiwaay.net/~langford/corvair/airbox/ for more details... Mark Langford, Huntsville, Alabama see KR2S project N56ML at http://home.hiwaay.net/~langford email to N56ML "at" hiwaay.net -------------------------------------------------------------- ------------------------------ Message: 3 Date: Sun, 6 Mar 2005 12:09:02 -0500 From: "Brian Kraut" Subject: RE: KR> teeny weeny project update To: "KRnet" Message-ID: Content-Type: text/plain; charset="us-ascii" Ahhh, the dreaded two left sides. Welcome to the sheet metal world. You know that somewhere out there someone building a sheet metal plane has built two entire left wings before they noticed. Brian Kraut Engineering Alternatives, Inc. www.engalt.com -----Original Message----- From: krnet-bounces+brian.kraut=engalt.com@mylist.net [mailto:krnet-bounces+brian.kraut=engalt.com@mylist.net]On Behalf Of Mark Langford Sent: Sunday, March 06, 2005 11:52 AM To: KRnet Subject: Re: KR> teeny weeny project update Gav wrote: >Am I to understand that you plan to go without a carb heat cable and >allow full automatic operation operated by ram pressure alone?? Right now it's not, but when I build the next one it will be that way. The carb heat valve flapper is a nice tight fit, but swings freely. The flapper is stainless steel, so is heavy enough to always return to the closed position with no other influence (it's supported on oil impregnated sintered bronze bushings. The way it is now, I could shut off both ram air and carb heat air, and starve the engine for air, which would not be good. I did a web page for it this morning, so see http://home.hiwaay.net/~langford/corvair/airbox/ for more details... Mark Langford, Huntsville, Alabama see KR2S project N56ML at http://home.hiwaay.net/~langford email to N56ML "at" hiwaay.net -------------------------------------------------------------- _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to KRnet-leave@mylist.net please see other KRnet info at http://www.krnet.org/info.html ------------------------------ Message: 4 Date: Sun, 6 Mar 2005 13:58:51 -0500 (EST) From: Don Chisholm Subject: KR> emag electronic ignition To: krnet@mylist.net Message-ID: <20050306185851.58012.qmail@web88007.mail.re2.yahoo.com> Content-Type: text/plain; charset=us-ascii thanks Brian, good lead.They don't have them for Continentals yet but are working on it. Looks to be slicker setup than LSE ignitions and for my application easier to do than LSE Don Chisholm ------------------------------ Message: 5 Date: Sun, 6 Mar 2005 14:22:45 -0600 From: Subject: KR> Stainless Steel on Firewall To: "KRnet" Message-ID: <001e01c5228a$42605d50$89489445@DELL> Content-Type: text/plain; charset="iso-8859-1" KRNET< I will soon be adding fiberfrax and the stainless steel to the firewall. Does the stainless steel bond well to the fiberfrax? Ray Goree Ray Goree 817-795-4779 ------------------------------ Message: 6 Date: Sun, 6 Mar 2005 13:36:13 -0800 (PST) From: Scott Cable Subject: Re: KR> project update suggestions/questions To: KRnet Message-ID: <20050306213613.76832.qmail@web53010.mail.yahoo.com> Content-Type: text/plain; charset=us-ascii Mark, Nice work on the airbox (as usual)....however, I did notice a couple of areas that I was wondering about: 1.) The heat muff is secured by wrapping safety wire around it? What prevents vibration from allowing the heat muff to move around and start chafing the header? Also, wouldn't vibration cause the safety wire from moving around and then possibly falling off? The off-the-shelf heat muff uses hose clamps to secure the muff to header, could you cutoff the forward side of it to allow air into it? Then secure it to the header with the rear hose clamp. 2.) I noticed what appeared to be platenut holes for the carb mount, yet you stated in the text (2nd to bottom picture) that you needed to get your daughter to start the nuts. In your improved (next) version will you utilize platenuts? 3.) The air filter looks like it needs something to support it in the center. Especially since you added a diffuser plate to the center of the filter. From the way it is supported only along the top and bottom, it concerns me that the combination of ram air and engine vacuum could cause the filter to collapse, then get sucked down to the carb and block off the airflow to the carb during flight....Not a good thing. My suggestion is to add vertical "vanes" to the angles that support the filter, or add an angle to the ram air diffuser plate that is the same height as the filter... or some other method that would prevent the filter from collapsing. 4.) Please re-think the emergency air-valve. Adding it would serve two functions: a.) emergency air source if both valves are shut. b.) Act as an additional source of cowling air if the heated air from the muff is inadequate for conditions. Don't use a magnet, but rather a very light helical, torsion spring to keep the valve closed until it was necessary. If you hinge the emergency air flapper around the existing ram air valve pivot, you could add an additional hole to front of the airbox, and at least the emergency air source would be filtered. 5.) I was more than a bit suprised not to see the airbox made out of Carbon Fiber or at least fiberglass. The rest of the cooling system was made from composite... Of course, just get the thing flying is certainly a factor here I'm sure. Mark Langford wrote: http://home.hiwaay.net/~langford/corvair/airbox/ for more details... Scott Cable KR-2S # 735 Wright City, MO s2cable1@yahoo.com __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ------------------------------ Message: 7 Date: Sun, 6 Mar 2005 16:03:45 -0600 From: "Bubba" Subject: Re: KR> project update suggestions/questions To: "KRnet" Message-ID: <03f901c52298$5e87ab10$0200a8c0@Katana> Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Scott Cable wrote: > > 3.) The air filter looks like it needs something to support it in the > center. Especially since you added a diffuser plate to the center of > the filter. From the way it is supported only along the top and > bottom, it concerns me that the combination of ram air and engine > vacuum could cause the filter to collapse, then get sucked down to the > carb and block off the airflow to the carb during flight....Not a good > thing. My suggestion is to add vertical "vanes" to the angles that > support the filter, or add an angle to the ram air diffuser plate that > is the same height as the filter... or some other method that would > prevent the filter from collapsing. I agree. I've watched a "puny" little 3/4 liter inline 4 fold a K&N in half at full throttle. We fixed that problem with safety wire crossed over the carb side of the filter laced through the sides of the airbox and twisted tight. It was in a superbike airbox so we didn't have much room to work. > 4.) Please re-think the emergency air-valve. Adding it would serve > two functions: > a.) emergency air source if both valves are shut. > b.) Act as an additional source of cowling air if the heated air from > the muff is inadequate for conditions. Don't use a magnet, but rather > a very light helical, torsion spring to keep the valve closed until it > was necessary. If you hinge the emergency air flapper around the > existing ram air valve pivot, you could add an additional hole to > front of the airbox, and at least the emergency air source would be > filtered. How about a door controlled by a vacuum servo? If there's too much vacuum in the airbox for whatever reason the emergency air will open automatically. I'd put the intake for that air source somewhere hot just in case. -- Steve N205FT mysticz28@swbell.net He who seeks will find, and he who knocks will be let in. ------------------------------ Message: 8 Date: Mon, 7 Mar 2005 09:07:19 +1000 From: "Glasseyegav" Subject: Re: KR> teeny weeny project update To: "KRnet" Message-ID: <003b01c522a1$3f376080$0100000a@vic.bigpond.net.au> Content-Type: text/plain; charset="iso-8859-1" : Re: KR> teeny weeny project update > Gav wrote: > > >Am I to understand that you plan to go without a carb heat cable > >and allow full automatic operation operated by ram pressure alone?? > > Right now it's not, but when I build the next one it will be that way. > > Sorry Mark!! I don't personally think that's a good idea for a number of reasons. 1. What happens if you want to test the operation of your carb heat on the ground and your air filter is partially blocked ?? The lower pressure in that area will always suck the valve open putting the carb heat on and reducing performance. 2. If the ram pressure keeps the carb heat turned off, then what's to keep the carb heat turned off while on the ground and letting the engine suck up all of that unfiltered air through the heat muff when you most need filtered air? Gav ------------------------------ Message: 9 Date: Sun, 6 Mar 2005 17:23:22 -0600 From: "Mark Jones" Subject: Re: KR> Stainless Steel on Firewall To: , "KRnet" Message-ID: <009d01c522a3$83160840$6401a8c0@wi.rr.com> Content-Type: text/plain; charset="iso-8859-1" Not really.....but then you really do not have to worry about it bonding. The way I did mine was to use high temperature fireplace caulk and spread it on the wood firewall. Press the fiberfrax on to the firewall. Apply another thin coat on the fiberfrax and set the stainless firewall in place. It will cure and hold the stainless but does tend to separate over time. However, this does not matter because you will be installing a lot of things on the firewall such as the engine mount, etc which will all hold the stainless firewall in place. Mark Jones (N886MJ) Wales, WI USA E-mail me at flykr2s@wi.rr.com Visit my KR-2S CorvAIRCRAFT web site at http://mywebpage.netscape.com/n886mj/homepage.html ----- Original Message ----- From: To: "KRnet" Sent: Sunday, March 06, 2005 2:22 PM Subject: KR> Stainless Steel on Firewall > KRNET< > I will soon be adding fiberfrax and the stainless steel to the firewall. > Does the stainless steel bond well to the fiberfrax? > Ray > Goree Ray Goree 817-795-4779 > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to KRnet-leave@mylist.net > please see other KRnet info at http://www.krnet.org/info.html > ------------------------------ Message: 10 Date: Sun, 6 Mar 2005 19:06:06 -0500 (Eastern Standard Time) From: "Dan Heath" Subject: KR> W & B and other progress To: "krnet@mylist.net" Message-ID: <422B9AEE.00000D.02184@DANHOMECOMPUTER> Content-Type: Text/Plain; charset="iso-8859-1" Please take a look at this W & B sheet. At the bottom is the part where the station for the engine can be adjusted. The yellow highlighted cells are where the numbers go. The engine is at a negative station as the firewall is used for the datum. Any constructive comments, or error corrections will be greatly appreciated. This weekend we did the W & B over again after carefully calibrating the scales. Bathroom scales leave a lot to be desired, but the numbers pass the reasonableness test. Great news, the plane weighs 624# empty and the GC is OK as it is, but I think that moving the engine forward will make it better. Tell me what you think. More great news, we put 5 gal of fuel in it and no leaks have been found. Bad news is that the fuel gauge does not work. One thing on choice of fuel, I first bought some Exxon 93 Octane to use for the pump tests and the odor is enough to kill you. This time I bought Amoco and it has about the same odor as avgas. The wings are now fully painted and we have worked out the fuel system. Now, as soon as the engine placement is decided, I will finish up the cowling, the only big thing left. See N64KR at http://KR-Builder.org - Then click on the pics There is a time for building and a time for FLYING and the time for building has expired. Daniel R. Heath - Columbia, SC See you in Mt. Vernon - 2005 - KR Gathering ------------------------------ Message: 11 Date: Sun, 6 Mar 2005 19:09:48 -0500 (Eastern Standard Time) From: "Dan Heath" Subject: KR> Link to the W & B Sheet. I forgot to include it. To: "krnet@mylist.net" Message-ID: <422B9BCC.000013.02184@DANHOMECOMPUTER> Content-Type: Text/Plain; charset="iso-8859-1" Please take a look at this W & B sheet. At the bottom is the part where the station for the engine can be adjusted. The yellow highlighted cells are where the numbers go. The engine is at a negative station as the firewall is used for the datum. Any constructive comments, or error corrections will be greatly appreciated. http://kr-builder org/WeightAndBalance/Weight_Balance_N64KR_Calibrated_Scales_EnginePlacement xls This weekend we did the W & B over again after carefully calibrating the scales. Bathroom scales leave a lot to be desired, but the numbers pass the reasonableness test. Great news, the plane weighs 624# empty and the GC is OK as it is, but I think that moving the engine forward will make it better. Tell me what you think. More great news, we put 5 gal of fuel in it and no leaks have been found. Bad news is that the fuel gauge does not work. One thing on choice of fuel, I first bought some Exxon 93 Octane to use for the pump tests and the odor is enough to kill you. This time I bought Amoco and it has about the same odor as avgas. The wings are now fully painted and we have worked out the fuel system. Now, as soon as the engine placement is decided, I will finish up the cowling, the only big thing left. See N64KR at http://KR-Builder.org - Then click on the pics There is a time for building and a time for FLYING and the time for building has expired. Daniel R. Heath - Columbia, SC See you in Mt. Vernon - 2005 - KR Gathering ------------------------------ Message: 12 Date: Sun, 6 Mar 2005 18:15:51 -0600 From: "Mark Jones" Subject: Re: KR> W & B and other progress To: "KRnet" Message-ID: <00c101c522aa$d7f6fd40$6401a8c0@wi.rr.com> Content-Type: text/plain; charset="iso-8859-1" - Original Message ----- From: "Dan Heath" . > Bad news is that the fuel gauge does not work.> Dan, Is that sending unit a mechanical float type or capacitance? Mark Jones (N886MJ) Wales, WI USA E-mail me at flykr2s@wi.rr.com Visit my KR-2S CorvAIRCRAFT web site at http://mywebpage.netscape.com/n886mj/homepage.html ------------------------------ Message: 13 Date: Sun, 6 Mar 2005 19:15:54 -0500 (Eastern Standard Time) From: "Dan Heath" Subject: Re: KR> W & B and other progress To: "krnet@mylist.net" Message-ID: <422B9D3A.000015.02184@DANHOMECOMPUTER> Content-Type: Text/Plain; charset="iso-8859-1" Float type, el cheapo Auto Zone type that Jerry bought. See N64KR at http://KR-Builder.org - Then click on the pics There is a time for building and a time for FLYING and the time for building has expired. Daniel R. Heath - Columbia, SC See you in Mt. Vernon - 2005 - KR Gathering -------Original Message------- From: KRnet Date: 03/06/05 19:13:20 To: KRnet Subject: Re: KR> W & B and other progress - Original Message ----- From: "Dan Heath" .. > Bad news is that the fuel gauge does not work.> Dan, Is that sending unit a mechanical float type or capacitance? Mark Jones (N886MJ) Wales, WI USA E-mail me at flykr2s@wi.rr.com Visit my KR-2S CorvAIRCRAFT web site at http://mywebpage.netscape.com/n886mj/homepage.html _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to KRnet-leave@mylist.net please see other KRnet info at http://www.krnet.org/info.html . ------------------------------ Message: 14 Date: Sun, 6 Mar 2005 19:19:27 -0500 (Eastern Standard Time) From: "Dan Heath" Subject: KR> Link to Sheet To: "krnet@mylist.net" Message-ID: <422B9E0F.000019.02184@DANHOMECOMPUTER> Content-Type: Text/Plain; charset="iso-8859-1" Sorry, it looks like that last link to the sheet does not work. http://kr-builder.org/WeightAndBalance/N64KRWB.xls See N64KR at http://KR-Builder.org - Then click on the pics There is a time for building and a time for FLYING and the time for building has expired. Daniel R. Heath - Columbia, SC See you in Mt. Vernon - 2005 - KR Gathering ------------------------------ Message: 15 Date: Sun, 6 Mar 2005 18:48:11 -0600 From: "Mark Jones" Subject: Re: KR> W & B and other progress To: "KRnet" Message-ID: <00cf01c522af$5bb77ca0$6401a8c0@wi.rr.com> Content-Type: text/plain; charset="iso-8859-1" There is a good possibility that it is simply stuck. I too have a float type and when I filled the tank it the gauge showed empty. I was really p$%$%$% off cause it worked when I tested it. However, the first time I taxied and hit a good bump on the taxi way, the sending unit jarred loose and it now works properly. Possibly this is the case with yours. Mark Jones (N886MJ) Wales, WI USA E-mail me at flykr2s@wi.rr.com Visit my KR-2S CorvAIRCRAFT web site at http://mywebpage.netscape.com/n886mj/homepage.html ----- Original Message ----- From: "Dan Heath" To: Sent: Sunday, March 06, 2005 6:15 PM Subject: Re: KR> W & B and other progress > Float type, el cheapo Auto Zone type that Jerry bought. > > See N64KR at http://KR-Builder.org - Then click on the pics > There is a time for building and a time for FLYING and the time for building > has expired. > Daniel R. Heath - Columbia, SC > See you in Mt. Vernon - 2005 - KR Gathering > -------Original Message------- > > From: KRnet > Date: 03/06/05 19:13:20 > To: KRnet > Subject: Re: KR> W & B and other progress > > - Original Message ----- > From: "Dan Heath" > .. > > Bad news is that the fuel gauge does not work.> > > Dan, > Is that sending unit a mechanical float type or capacitance? > > Mark Jones (N886MJ) > Wales, WI USA > E-mail me at flykr2s@wi.rr.com > Visit my KR-2S CorvAIRCRAFT web site at > http://mywebpage.netscape.com/n886mj/homepage.html > > > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to KRnet-leave@mylist.net > please see other KRnet info at http://www.krnet.org/info.html > . > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to KRnet-leave@mylist.net > please see other KRnet info at http://www.krnet.org/info.html > ------------------------------ Message: 16 Date: Mon, 7 Mar 2005 10:50:00 +1000 From: "Barry Kruyssen" Subject: Re: KR> Link to Sheet To: "KRnet" Message-ID: <013e01c522af$99a3d7c0$8200a8c0@technologyonecorp.com> Content-Type: text/plain; charset="iso-8859-1" So with only 1 person onboard you ar at 10.860" while it could be 8" Also you currently have no allowance for baggage. I would try to get to the forward limit with pilot and fuel onboard. regards Barry Kruyssen Cairns, Australia RAA 19-3873 kr2@BigPond.com http://www.users.bigpond.com/kr2/kr2.htm ----- Original Message ----- From: Dan Heath http://kr-builder.org/WeightAndBalance/N64KRWB.xls ------------------------------ Message: 17 Date: Sun, 6 Mar 2005 19:54:01 -0500 From: "Colin & Bev Rainey" Subject: KR> Gauge To: "KRnet" Message-ID: <006f01c522b0$276731b0$9c402141@RaineyDay> Content-Type: text/plain; charset="iso-8859-1" Dan Mine is always slow to respond after fueling, due to the tail being low, so the float is working at an angle, but it does come up after a little taxiing, or in level flight. Changed prop back to Culver today due to lots of little cracks found in used Otto prop, so it is now good for a wall clock if anyone wants to buy it...haha. 30.5 hours and counting.... Colin & Beverly Rainey Apex Lending, Inc. www.eloan2004cr.com crainey@apexlending.com 407-323-6960 ------------------------------ Message: 18 Date: Sun, 6 Mar 2005 19:55:36 -0500 (Eastern Standard Time) From: "Dan Heath" Subject: KR> Fuel gauge not working. To: "krnet@mylist.net" Message-ID: <422BA688.00001B.02184@DANHOMECOMPUTER> Content-Type: Text/Plain; charset="iso-8859-1" Mark, Thanks, Jerry said that this tested good also, when he was calibrating it many many years ago. I will stick a wire in the tank and see if I can lift the float. I sure hope that is all it is, because I don't think that I can get this gauge out of the panel without taking the panel off because of what I had to do to get it in securely. If it were a standard aircraft type gauge then it would not be so much of a concern. See N64KR at http://KR-Builder.org - Then click on the pics There is a time for building and a time for FLYING and the time for building has expired. Daniel R. Heath - Columbia, SC See you in Mt. Vernon - 2005 - KR Gathering There is a good possibility that it is simply stuck. ------------------------------ Message: 19 Date: Sun, 06 Mar 2005 17:03:17 -0800 From: larry severson Subject: Re: KR> Fuel gauge not working. To: KRnet Message-ID: <5.2.1.1.0.20050306170120.021d0be8@pop-server.socal.rr.com> Content-Type: text/plain; charset="us-ascii"; format=flowed > I don't think that I can >get this gauge out of the panel without taking the panel off because of what >I had to do to get it in securely. If it were a standard aircraft type gauge > then it would not be so much of a concern. I replaced mine. Yes, I had to remove the panel, and yes it was a pain, but now it works - for $19 (vs $40 from Spruce - the difference is that the spruce bolt holes are accurate, the automotive aren't). Larry Severson Fountain Valley, CA 92708 (714) 968-9852 larry2@socal.rr.com ------------------------------ Message: 20 Date: Sun, 6 Mar 2005 19:23:24 -0600 From: "Mark Langford" Subject: Re: KR> project update suggestions/questions To: "KRnet" Message-ID: <00e201c522b4$42519e30$1202a8c0@1700xp> Content-Type: text/plain; charset="iso-8859-1" Scott Cable wrote: > 1.) The heat muff is secured by wrapping safety wire around it? What prevents vibration from allowing the heat muff to move around and start chafing the header? What keeps it from moving is the fact that it straddles the down pipes through very tight fitting holes that keep movement to under 1/32", and it's wrapped tightly around the stainless steel spring. I clamped it in place with hose clamps, ran the safety wire around them (and it's trapped in those same holes), and then removed the clamps. It's rather tight, and not going anywhere. I used safety wire because it's far lighter than hose clamps. If it'll make you feel better, I'll wrap three more rounds around it, and run them through holes to guarantee that they stay put. > 2.) I noticed what appeared to be platenut holes for the carb mount, yet you stated in the text (2nd to bottom picture) that you needed to get your daughter to start the nuts. In your improved (next) version will you utilize platenuts? The reason I didn't use them yet is because the carb is threaded for 1/4-20 studs, so I'll either have to drill out the threads or use 3/16 bolts and nutplates (which is what I'll do). Next time it comes off I'll add the nutplates anyway, now that I know what a pain it is. That'll be before it flies. > 3.) The air filter looks like it needs something to support it in the center. I appreciate your concern, but I don't think so. It's only 3.5" tall, and supported all the way across the top by an aluminum angle, and has 6 screws holding the bottom. I'm not worried about it. > 4.) Please re-think the emergency air-valve. Adding it would serve two functions: > a.) emergency air source if both valves are shut. > b.) Act as an additional source of cowling air if the heated air from the muff is inadequate for conditions. That's why I said I was going to do a slight redesign and allow it to open automatically, so the engine can't be starved for air. I assure you that this heat muff will supply more than enough warm air for any condition that I will be ever be flying in. > Don't use a magnet, but rather a very light helical, torsion spring to keep the valve closed until it was necessary. If you hinge the emergency air flapper around the existing ram air valve pivot, you could add an additional hole to front of the airbox, and at least the emergency air source would be filtered. But if I had a hole that was open when the ram air was closed, I'd cut the effects of my carb heat muff in half, because I'd only pull half as much air through the heat muff. > 5.) I was more than a bit suprised not to see the airbox made out of Carbon Fiber or at least fiberglass. As I mentioned, the aluminum provides stiff flat surfaces to mount the valves on, that are not susceptible to deformation when heated. I may make a composite one someday, but the valves will be mounted on aluminum planes for that reason. Thanks for your comments. Mark Langford, Huntsville, Alabama see KR2S project N56ML at http://home.hiwaay.net/~langford email to N56ML "at" hiwaay.net -------------------------------------------------------------- ------------------------------ Message: 21 Date: Mon, 7 Mar 2005 14:31:47 +1000 From: "Barry Kruyssen" Subject: Re: KR> teeny weeny project update To: "KRnet" Message-ID: <018e01c522ce$94cda680$8200a8c0@technologyonecorp.com> Content-Type: text/plain; charset="iso-8859-1" Hi Mark I agree with Gav, Sucking unfilter air into that beautiful engine would be criminal. But the again I'm in Australia, in an aera where dust can be found in the air up to 10,000+. It occurs more than I like. regards Barry Kruyssen Cairns, Australia RAA 19-3873 kr2@BigPond.com http://www.users.bigpond.com/kr2/kr2.htm ----- Original Message ----- From: Glasseyegav To: KRnet Sent: Monday, March 07, 2005 9:07 AM Subject: Re: KR> teeny weeny project update : Re: KR> teeny weeny project update > Gav wrote: > > >Am I to understand that you plan to go without a carb heat > > cable and allow full automatic operation operated by ram pressure alone?? > > Right now it's not, but when I build the next one it will be that way. > Sorry Mark!! I don't personally think that's a good idea for a number of reasons. 1. What happens if you want to test the operation of your carb heat on the ground and your air filter is partially blocked ?? The lower pressure in that area will always suck the valve open putting the carb heat on and reducing performance. 2. If the ram pressure keeps the carb heat turned off, then what's to keep the carb heat turned off while on the ground and letting the engine suck up all of that unfiltered air through the heat muff when you most need filtered air? Gav _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to KRnet-leave@mylist.net please see other KRnet info at http://www.krnet.org/info.html ------------------------------ _______________________________________________ See KRnet list details at http://www.krnet.org/instructions.html End of KRnet Digest, Vol 347, Issue 94 ************************************** ================================== ABC Amber Outlook Converter v4.20 Trial version ==================================