From: krnet-bounces@mylist.net To: John Bouyea Subject: KRnet Digest, Vol 346, Issue 9 Date: 7/3/2004 9:00:00 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: Drilling Holes in Spars - stress riser? (Wesley Scott) 2. RE: Rotary (larry severson) 3. Re: Stall warnings (larry severson) 4. Re: Stall warnings (Dan Heath) 5. Re: Cockpit fresh air supply (Timothy Bellville) 6. Re: Re: KR> Stall warnings (skphil@charter.net) 7. Re: Re: "DOG-CUSSING" (Phillip Matheson) 8. Re: Stall warnings (larry severson) 9. Re: Cockpit fresh air supply (Phillip Matheson) 10. Re: Sanding before glueing ?? (Phillip Matheson) 11. Re: Stall warnings (Dan Heath) 12. Re: Yahoo groups feature list (Phillip Matheson) ---------------------------------------------------------------------- Message: 1 Date: Sat, 3 Jul 2004 19:21:43 -0500 From: "Wesley Scott" Subject: Re: KR> Drilling Holes in Spars - stress riser? To: "KRnet" Message-ID: <003d01c4615c$e3c21750$a62e0704@pbrain> Content-Type: text/plain; charset="iso-8859-1" Looking at a simple vertical shear moment diagram for a wing fuselage arrangement like the KR(treating the spar as a beam) with a questionable but perhaps not unrealistic assumption that the vertical load on the two longerons is equal (this assumes the weight of the plane is centered within the fuselage including the pilot or the fuselage structure equalizes the loads) and the wing loading is symetrical, the vertical shear force on the spar inside the fuselage is zero and the bending moment is constant and at its maximum across the entire width of the fuselage. The vertical shear force is zero because of the assumption that each wing provides half the lift which is half the weight of the plane X G factor and that load is transferred to the fuselage structure at the longeron. ref: section 5-8 Shear and Moment Diagrams, Mechanics of Materials, 3rd Ed. Higdon, Ohlsen, Stiles, Weese and Riley, John Wiley & Sons, NY, copyright 1976 ----- Original Message ----- From: "Stephen Jacobs" To: "'KRnet'" Sent: Saturday, July 03, 2004 3:24 PM Subject: RE: KR> Drilling Holes in Spars - stress riser? > I can see where this would be needed in what I would assume would be > the working part of the wing ( mostly outside the WAFs ). > > +++++++++++++++++++++++++ > > In the interest of us non-structural types getting the facts straight > and not breaking our necks: > > I would have thought that the further outboard we go, the lower the > bending loads on the spar - thus the lower all the stresses > (compression, tensile and shear). Is that not why the spar can be > tapered? > > Surely the point of max stress for any beam or truss is point where > the load works through the longest moment arm - in our case, right in > the centre of the airplane (for spars). > > I can see that the fuselage structure may have a minor influence on > the spar stress analysis but I figured the fuselage is not > contributing anything meaningful, it is designed for structural > integrity in its own rights (mainly for/aft axis) with the gussets and > doublers in the spar /fuselage area being there to keep the fuselage > attached to the wing. > > If anything, the spar is a significant contributor to the fuselage > strength. > > Sorry to keep tugging at this one, but it is important in my > application. I want to put the elevator push-rod through the rear > spar and the rudder cables down the centre through both spars. That > way all the controls go down the middle, the antenna (RF) leads all go > down one side (over the spars) and the electrical power supply wires > have max separation by going aft way over on the other side. > Hopefully that will keep the "noise" from strobes /beacons /pumps away > from the antenna leads. > > The input from Donald R has me convinced that I will be Ok with a > small hole in the centre of the front spar (Just enough for two rudder > cables); plus a hole through the rear spar (enough for two cables and > the push rod) both holes with tapered (feathered) reinforcing rings > both sides of each spar. > > Take care > Steve J > > > > _______________________________________ > 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: 2 Date: Sat, 03 Jul 2004 18:44:59 -0700 From: larry severson Subject: RE: KR> Rotary To: KRnet Message-ID: <5.2.1.1.0.20040703184257.02492e68@pop-server.socal.rr.com> Content-Type: text/plain; charset="us-ascii"; format=flowed >One glaring deficiency with the KR series aircraft has >been lack of power and over sensitivity of controls and since Jeanette >seems as though she is not interested in addressing these problems for >whatever reasons, perhaps it is time that we take over and improve the >little bird to a position it so rightfully deserves. The KR2 is VW bug efficient, not Corvette powerful. It can be changed, but why???? Larry Severson Fountain Valley, CA 92708 (714) 968-9852 larry2@socal.rr.com ------------------------------ Message: 3 Date: Sat, 03 Jul 2004 19:06:00 -0700 From: larry severson Subject: Re: KR> Stall warnings To: KRnet Message-ID: <5.2.1.1.0.20040703190413.02478538@pop-server.socal.rr.com> Content-Type: text/plain; charset="us-ascii"; format=flowed At 04:09 PM 7/3/2004 -0700, you wrote: >I searched the archives and didn't find to much on stall warnings and I >haven't noticed too many people installing them. What is the consensus >regarding them for KR projects. I have seen some low priced ones at wicks >and A.S. Get a Dynon D10 EFIS with their pitot tube. This combination will supply angle of attack information. A given airplane always stalls at the same angle of attack, not speed or attitude. Larry Severson Fountain Valley, CA 92708 (714) 968-9852 larry2@socal.rr.com ------------------------------ Message: 4 Date: Sat, 3 Jul 2004 22:18:21 -0400 (Eastern Standard Time) From: "Dan Heath" Subject: Re: KR> Stall warnings To: "krnet@mylist.net" Message-ID: <40E768ED.00000C.02956@COMPUTER> Content-Type: Text/Plain; charset="iso-8859-1" RE: A given airplane always stalls at the same angle of attack, not speed or attitude. On my first BFR, my instructor set out to disprove that theory. He had me keep applying power while continuing to increase the angle of attack. By the time I got to full power, we were almost hanging on the prop and the airspeed was reading zero and no stall. I found that very interesting. "There is a time for building and a time for flying, and the time for building has long since expired." See N64KR at http://KR-Builder.org - Then click on the pics Daniel R. Heath - Columbia, SC See you in Mt. Vernon - 2004 - KR Gathering ------------------------------ Message: 5 Date: Sat, 3 Jul 2004 22:19:07 -0400 From: "Timothy Bellville" Subject: Re: KR> Cockpit fresh air supply To: "KRnet" Message-ID: <001b01c4616d$495b8280$6d2b4b0c@HPHome> Content-Type: text/plain; charset="iso-8859-1" I have two small Naca ducts in my canopy frame that work great,I control the air flow on the inside with twist vents. Tim ----- Original Message ----- From: "Dan Heath" To: Sent: Saturday, July 03, 2004 1:28 PM Subject: Re: KR> Cockpit fresh air supply > Well, I guess I will reply to myself. > > I think you could put a NACA duct on the side of the fuselage up near > the firewall and run a hose to the instrument panel were you would put > those neat little thingys, or it might be better to bring the air in > from the cowling and route through the firewall. Although, there may > really be a better thingy than those thingys, but I am not really sure > what it might be. > And going through the firewall has it's advantages and disadvantages, > but I > really don't know what those might be as I have never done that > before. Well > I know one thing, putting a NACA scoop on the pilot end of the > fuselage doesn't work, so I guess you should not do that. > > And if that does not clear it up, just let me know and I will explain > it another way. > > "There is a time for building and a time for flying, and the time for > building has long since expired." > > See N64KR at http://KR-Builder.org - Then click on the pics > > Daniel R. Heath - Columbia, SC > > See you in Mt. Vernon - 2004 - KR Gathering > > > > -------Original Message------- > > > > From: KRnet > > Date: 07/02/04 18:32:13 > > To: krnet@mylist.net > > Subject: KR> Cockpit fresh air supply > > > > No, not hot air, I have plenty of that. How are you, who have gotten > to that > > point, doing your fresh air supply for the cockpit. I was going to use snap > > vents in the side of the fuselage, but, have decided that the > uncovered part > > of the hole is too large. I am thinking of those little swivel things > like > > they have on the airliners or something like that. > > > > I am interested in everything from the intake to the outlet. > > > > Thanks in advance. > > > > "There is a time for building and a time for flying, and the time for > > building has long since expired." > > > > See N64KR at http://KR-Builder.org - Then click on the pics > > > > Daniel R. Heath - Columbia, SC > > > > See you in Mt. Vernon - 2004 - KR Gathering > > > > > > > > > > _______________________________________ > > to UNsubscribe from KRnet, send a message to KRnet-leave@mylist.net > > please see other KRnet info at http://www.krnet.org/info.html > > > > _______________________________________ > 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: 6 Date: Sun, 4 Jul 2004 2:24:30 +0000 From: Subject: Re: Re: KR> Stall warnings To: KRnet Message-ID: <391tnc$2d9evi@mxip06a.cluster1.charter.net> Content-Type: text/plain; charset=ISO-8859-1 You can stall a plane in a dive. I also am interested in hearing some more on stall warnings that are Low Cost Mr. Cheap Steven Phillabaum Auburn, Alabama 2 mile final for 36 > > From: "Dan Heath" > Date: 2004/07/04 Sun AM 02:18:21 GMT > To: "krnet@mylist.net" > Subject: Re: KR> Stall warnings > > RE: A given airplane always stalls at the same angle of attack, not > speed or attitude. > > On my first BFR, my instructor set out to disprove that theory. He had > me keep applying power while continuing to increase the angle of > attack. By the time I got to full power, we were almost hanging on the > prop and the airspeed was reading zero and no stall. I found that very > interesting. > > "There is a time for building and a time for flying, and the time for > building has long since expired." > > See N64KR at http://KR-Builder.org - Then click on the pics > > Daniel R. Heath - Columbia, SC > > See you in Mt. Vernon - 2004 - KR Gathering > > > > > _______________________________________ > 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: 7 Date: Sun, 4 Jul 2004 12:27:22 +1000 From: "Phillip Matheson" Subject: Re: KR> Re: "DOG-CUSSING" To: "KRnet" Message-ID: <006501c4616e$70668400$0000fea9@StationW2k04> Content-Type: text/plain; charset="iso-8859-1" Well done Mark, you do a great job Phillip Matheson matheson@dodo.com.au Australia VH PKR See our engines and kits at. http://www.vw-engines.com/ http://www.homebuilt-aviation.com/ See my KR at Mark Jones web http://mywebpage.netscape.com/n886mj/pmkr2.html ------------------------------ Message: 8 Date: Sat, 03 Jul 2004 19:26:47 -0700 From: larry severson Subject: Re: KR> Stall warnings To: KRnet Message-ID: <5.2.1.1.0.20040703192441.0246eea0@pop-server.socal.rr.com> Content-Type: text/plain; charset="us-ascii"; format=flowed At 10:18 PM 7/3/2004 -0400, you wrote: >RE: A given airplane always stalls at the same angle of attack, not >speed or attitude. > >On my first BFR, my instructor set out to disprove that theory. He had >me keep applying power while continuing to increase the angle of >attack. By the time I got to full power, we were almost hanging on the >prop and the airspeed was reading zero and no stall. I found that very >interesting. Angle of attack is the relative wind (not the path of the airplane through the air) over the airfoil. The prop contributes to that air flow. Larry Severson Fountain Valley, CA 92708 (714) 968-9852 larry2@socal.rr.com ------------------------------ Message: 9 Date: Sun, 4 Jul 2004 12:38:40 +1000 From: "Phillip Matheson" Subject: Re: KR> Cockpit fresh air supply To: "KRnet" Message-ID: <007401c46170$046d2630$0000fea9@StationW2k04> Content-Type: text/plain; charset="iso-8859-1" Dan I did see a great NACA scoop placed on the Leading Edge or just below the leading edge on the centre section . I was told it worked great. Phillip Matheson matheson@dodo.com.au Australia VH PKR See our engines and kits at. http://www.vw-engines.com/ http://www.homebuilt-aviation.com/ See my KR at Mark Jones web http://mywebpage.netscape.com/n886mj/pmkr2.html ------------------------------ Message: 10 Date: Sun, 4 Jul 2004 12:45:29 +1000 From: "Phillip Matheson" Subject: Re: KR> Sanding before glueing ?? To: "KRnet" Message-ID: <007e01c46170$f8191000$0000fea9@StationW2k04> Content-Type: text/plain; charset="iso-8859-1" I ran a Wire brush along my spars and roughed them up, ( Lightly) then blew them off. ( after reading about this some time back) Phillip Matheson matheson@dodo.com.au Australia VH PKR See our engines and kits at. http://www.vw-engines.com/ http://www.homebuilt-aviation.com/ See my KR at Mark Jones web http://mywebpage.netscape.com/n886mj/pmkr2.html ------------------------------ Message: 11 Date: Sat, 3 Jul 2004 22:45:34 -0400 (Eastern Standard Time) From: "Dan Heath" Subject: Re: KR> Stall warnings To: "krnet@mylist.net" Message-ID: <40E76F4E.000012.02956@COMPUTER> Content-Type: Text/Plain; charset="iso-8859-1" RE: Angle of attack is the relative wind (not the path of the airplane through the air) Thanks, Larry, now I understand what made that work that way. "There is a time for building and a time for flying, and the time for building has long since expired." See N64KR at http://KR-Builder.org - Then click on the pics Daniel R. Heath - Columbia, SC See you in Mt. Vernon - 2004 - KR Gathering ------------------------------ Message: 12 Date: Sun, 4 Jul 2004 13:02:16 +1000 From: "Phillip Matheson" Subject: Re: KR> Yahoo groups feature list To: , "KRnet" Message-ID: <00ab01c46173$507e6310$0000fea9@StationW2k04> Content-Type: text/plain; charset="iso-8859-1" Why Change it, IF it an't fully BROKE. I think the minor problems should be given a chance to be fixed. Phillip Matheson matheson@dodo.com.au Australia VH PKR See our engines and kits at. http://www.vw-engines.com/ http://www.homebuilt-aviation.com/ See my KR at Mark Jones web http://mywebpage.netscape.com/n886mj/pmkr2.html ------------------------------ _______________________________________________ See KRnet list details at http://www.krnet.org/instructions.html End of KRnet Digest, Vol 346, Issue 9 ************************************* ================================== ABC Amber Outlook Converter v4.20 Trial version ==================================