From: KR-net users group digest[SMTP:kr-net@telelists.com] Sent: Wednesday, December 09, 1998 12:01 AM To: kr-net digest recipients Subject: kr-net digest: December 08, 1998 KR-net users group Digest for Tuesday, December 08, 1998. 1. Re: flywheels 2. Kr wing skins; do they wrinkle in flight? 3. Re: Kr wing skins; do they wrinkle in flight? 4. timing 5. Ignition Systems 6. KR-2S Spars 7. Re: KR-2S Spars 8. Strobes, Nav lights, wheel and brakes, premolded components for sale, 9. Re: KR-2S Spars 10. Re: KR-2S Spars ---------------------------------------------------------------------- Subject: Re: flywheels From: "Mark Langford" Date: Tue, 8 Dec 1998 07:12:42 -0000 X-Message-Number: 1 Mike Taglieri wrote: >Why would a lighter flywheel compromise engine longevity? I'd expect >that the propeller already serves as a kind of flywheel, since it has >rotating mass, so by eliminating the flywheel from the other end, you're >decreasing the likelihood of crank breakage. However, I wish it were >possible to run a starter on a VW from a flywheel behind the prop, like >some other engines we know. A prop has a constantly changing thrust vector which can't help but vibrate the crank, unlike the more "dampening" flywheel. The rear drive setup that Great Plains is working on will isolate the prop from the crank, while keeping the flywheel between the two to dampen pulses from both directions. I predict this will be the end of broken cranks, as long as the stock forged ones or similar are used. I'd still like to know more about crank failures and what types of flywheels are involved. Anybody that wants to share their broken crank experiences are welcome to email me privately at the address below. The starter on the backside of the flywheel would be great, except that there's an engine back there. Mark Langford, Huntsville, Alabama mailto:langford@hiwaay.net see KR2S project N56ML at http://home.hiwaay.net/~langford ---------------------------------------------------------------------- Subject: Kr wing skins; do they wrinkle in flight? From: R.H.Mole@open.ac.uk Date: Tue, 8 Dec 1998 13:46:34 -0000 X-Message-Number: 2 Dear kr flyers, here in the UK, our authorities are concerned that the wing skins of the kr may wrinkle in flight. I personally very much doubt it. But I want to assemble a dossier to present to the Engineering staff. If you fly your Kr regularly then do please email me to say that either the skins don't wrinkle on your ship, or they do - possibly under high 'g' pull outs (and please mention your N number). Our Engineering folk are getting concerned that mixing glass skins on a wooden spar could be problematic and lead to wrinkles in the skin under high 'g'. I guess that the kr is exceptionally strong, as I don't know of any mid air structural failures of the wing. I want to demonstrate that this potential problem is moonshine and does not occur in practice. I do hope that you can provide personal testimonies. Many thanks Richard Mole R.H.Mole@open.ac.uk ---------------------------------------------------------------------- Subject: Re: Kr wing skins; do they wrinkle in flight? From: "Rob Matthews" Date: Wed, 9 Dec 1998 21:24:36 +0200 X-Message-Number: 3 Hi Richard I have seen a kr here in South Africa with a corregated wing (wrinkled). This kr was painted black and the workmanship didn't seem that good. Whether this occurred due to poor workmanship or poor foam to glass adhesion or because it was painted black and the heat caused it to soften the glass i am not sure. this should be a good thread to discuss. Regards Rob Matthews Have A Wonderful Day South Africa ( Sunny Skies ) KR 2 - ZS - VCM -----Original Message----- From: R.H.Mole@open.ac.uk To: KR-net users group Date: Tuesday, 08 December, 1998 03:47 Subject: [kr-net] Kr wing skins; do they wrinkle in flight? >Dear kr flyers, > >here in the UK, our authorities are concerned that the wing skins of the >kr may wrinkle in flight. I personally very much doubt it. > >But I want to assemble a dossier to present to the Engineering staff. > >If you fly your Kr regularly then do please email me to say that either >the skins don't wrinkle on your ship, or they do - possibly under high >'g' pull outs (and please mention your N number). > >Our Engineering folk are getting concerned that mixing glass skins on a >wooden spar could be problematic and lead to wrinkles in the skin under >high 'g'. I guess that the kr is exceptionally strong, as I don't know >of any mid air structural failures of the wing. > >I want to demonstrate that this potential problem is moonshine and does >not occur in practice. I do hope that you can provide personal >testimonies. > > >Many thanks > > >Richard Mole >R.H.Mole@open.ac.uk > > > >--- >You are currently subscribed to kr-net as: mathewrz@iafrica.com >To unsubscribe send a blank email to leave-kr-net-17800J@telelists.com > > ---------------------------------------------------------------------- Subject: timing From: "Jesse Klebsch" Date: Tue, 08 Dec 1998 14:53:14 PST X-Message-Number: 4 Now that I have the rear seal replaced, it's time to put my 1835 back to gether and fly it. What I need to know though is- how do I time the engine when i put the acc. case back on. The mag was not removed from the case. I think all I need to do is pin the mag in the left(?) firing postion and turn the crank to top dead center on the #1 cylinder and then bolt the case back on with mag drive in place. Sound correct?? Jesse Klebsch ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com ---------------------------------------------------------------------- Subject: Ignition Systems From: Kip Anderson Date: Tue, 08 Dec 1998 19:42:31 -0500 X-Message-Number: 5 --------------FE6AAF50B9A13CDF6AB14FA5 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Here are a couple of good sources of information on solid state ignition systems. Electromotive Inc has an excelent installation manual on line. (http://members.aol.com/chanik/ed/kk.htm) Electromotive Inc. Racetech also sells several digital systems including a fuel injection system. (http://www.sdsefi.com) Racetech Simple Digital System Kip in Florida --------------FE6AAF50B9A13CDF6AB14FA5 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Here are a couple of good sources of information on solid state ignition systems.
Electromotive Inc has an excelent installation manual on line.
(http://members.aol.com/chanik/ed/kk.htm) Electromotive Inc.
Racetech also sells several digital systems including a fuel injection system.
(http://www.sdsefi.com)  Racetech Simple Digital System
 

Kip
in Florida
  --------------FE6AAF50B9A13CDF6AB14FA5-- ---------------------------------------------------------------------- Subject: KR-2S Spars From: Olga Saunders Date: Tue, 08 Dec 1998 19:38:49 -0500 X-Message-Number: 6 As per a suggestion by an engineer at RR, I covered both sides of my spars with a shear web. My question is this, do the closed in spaces inside the spar box need to ventilated ? I've heard of similiar closed in air pockets causing delamination at altitude with glass layups. Mike Saunders ---------------------------------------------------------------------- Subject: Re: KR-2S Spars From: Donald Reid Date: Tue, 08 Dec 1998 20:31:27 -0500 X-Message-Number: 7 Olga Saunders wrote: > > As per a suggestion by an engineer at RR, I covered both sides of my spars > with a shear web. My question is this, do the closed in spaces inside the > spar box need to ventilated ? I've heard of similiar closed in air pockets > causing delamination at altitude with glass layups. Most definitely, drill at least one small hole in each enclosed cavity in the spar. Failure to do so can lead to a castastrophic failure of the spar. It is not extremely likely, but there is no reason not to take the precaution. -- Don Reid Bumpass, Va. mailto:donreid@erols.com KR2XL at http://www.erols.com/donreid/kr_page.htm Ultralights at http://www.erols.com/donreid/usua250.html ---------------------------------------------------------------------- Subject: Strobes, Nav lights, wheel and brakes, premolded components for sale, From: "Joseph C. Ricks" Date: Tue, 08 Dec 1998 20:46:54 -0500 X-Message-Number: 8 Advanced Aircraft Elwctronics High Gain VHF Antenna Model VHF-5T $90 3 light Whelen Nav/Comet Flash Strobe kit...A413A HDA remote p/s, 2 A650 wingtip strobe/nav lights, 1 A500 Tail position/strobe light, T3-90 installation kit...$500 Cleveland 5.00 X 5 wheels, brakes, tires and tubes.....$475 KR-2S Premolded Cowling, Turtledeck and Canopy....$300 Add shipping costs to each. Joe Ricks, Atlanta, GA 770 914-2167 (home) 770 356-8545 ---------------------------------------------------------------------- Subject: Re: KR-2S Spars From: HAshraf@aol.com Date: Tue, 8 Dec 1998 21:18:01 EST X-Message-Number: 9 In a message dated 12/8/98 5:29:54 PM Pacific Standard Time, donreid@erols.com writes: << > As per a suggestion by an engineer at RR, I covered both sides of my spars > with a shear web. My question is this, do the closed in spaces inside the > spar box need to ventilated ? I've heard of similiar closed in air pockets > causing delamination at altitude with glass layups. Most definitely, drill at least one small hole in each enclosed cavity in the spar. Failure to do so can lead to a castastrophic failure of the spar. It is not extremely likely, but there is no reason not to take the precaution. >> How about a small pinhole in each web? It should to work too if some one forget to drill the verticle pieces. Haris Ashraf ---------------------------------------------------------------------- Subject: Re: KR-2S Spars From: Robert Covington Date: Tue, 8 Dec 1998 19:50:55 -0700 (MST) X-Message-Number: 10 >Olga Saunders wrote: >> >> As per a suggestion by an engineer at RR, I covered both sides of my spars >> with a shear web. My question is this, do the closed in spaces inside the >> spar box need to ventilated ? I've heard of similiar closed in air pockets >> causing delamination at altitude with glass layups. > >Most definitely, drill at least one small hole in each enclosed cavity >in the spar. Failure to do so can lead to a castastrophic failure of >the spar. It is not extremely likely, but there is no reason not to >take the precaution. > >-- >Don Reid The whole wing needs to be able to equalize to the outside air pressure as well as the spar. So make sure there are vents at the tips or somewhere else, or your wings will inflate at altitude. :) Robert Covington --- END OF DIGEST --- You are currently subscribed to kr-net as: johnbou@timberline.com To unsubscribe send a blank email to leave-kr-net-17800J@telelists.com