Thanks guys for the replies to my query, I think I will add a tape or two of carbon or uni glass around the end of the stub just to set my mind at ease. My worry is hitting an obstacle (mole hill,etc)on a rough strip and causing the gear leg to rely on the wing skin to transfer the backward force of the jolt from the rear spar to the forward spar without deforming the wing enough to "unplug" the gear tube from its pivot bearings at the WAF's. Regards Dene Collett South Africa KR2SRT builder mailto: dene.coll...@telkomsa.net www.whisperaircraft.co.za ----- Original Message ----- From: Martindale Family <johnja...@optusnet.com.au> To: KRnet <kr...@mylist.net> Sent: Monday, April 25, 2005 02:13 Subject: Re: KR> wing ridgidity
> Hi Dean > > That sounds like a neat way to do it. > > My question is how do you get the wheels to finish up forward of the main > spar (assuming a tail dragger) after extension from wells located between > the spars? Do you somehow have the main tube running at an angle between the > spars? > > Also, how far out is your pivot from the fuselage? I guess that having it at > the ends of the stubs would allow the longest gear legs but then more stub > distance and leg length would promote more twist between the spars which > seems to be your concern. I think some uni-directional or carbon fibre > strap, especially across the bottom of the wing between the pivot brackets > wouldn't be a bad thing but I've no engineering analysis to support that. > > >From vague memory, my TC has his gear legs hanging off an extension of the > tube you mention that goes through the centre of the main and stops in the > wing nose. His gear then folds up into the leading edge wing root fillet > which is enlarged to allow it, that is, his legs and wheels all tuck away > forward of the spar. > > I prefer your arrangement Dean but it would mean no stub fuel tanks...hmmm > > John > > The Martindale Family > 29 Jane Circuit > TOORMINA NSW 2452 > AUSTRALIA > > phone: 61 2 66584767 > email: johnja...@optusnet.com.au > ----- Original Message ----- > From: "Dene Collett (SA)" <dene.coll...@telkomsa.net> > To: "KRnet" <kr...@mylist.net> > Sent: Monday, April 25, 2005 6:27 AM > Subject: KR> wing ridgidity > > > > Since my retract gear is attached to a tube running between the front and > rear spars that locates in a self aligning bearing/bush at each end much > like the head of a rod end bearing which is attached by the WAF bolts to the > spars, my question is: How ridgid is the wing with regard to the distance > between the two spars once the skin is laid up (Mark L style skins)? > > For those that have seen the lancair 360 gear, mine is very similar where > it attaches to the wing spars which means that if the spars move approx 1/2" > further apart, the gear will become "unplugged". My stubs are not yet > skinned and the rear spar is able to move forward and back with very little > effort. How much force would it take to cause the wing to "stretch" once > skinned and attached to the outer wing? > > I suppose I could put a wrap of uni-directional tape around the wing in > the area of the WAF's?? > > Regards > > Dene Collett > > South Africa > > KR2SRT builder > > mailto: dene.coll...@telkomsa.net > > www.whisperaircraft.co.za > > _______________________________________ > > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > > to UNsubscribe from KRnet, send a message to krnet-le...@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-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html >
