Mark: I have read on the KRnet that it has been done but all are short on details of the repair part. I have not done much with fiber-glass so I may be over blowing my concern about cuting into the glass tha was applied in a particular fashion which would have its integrity changed by the repair. If this were a car no problem but cars do not fall out of the sky either.
Don ------------------------------------------------------------------------ Mark Langford wrote: > I'm sure somebody (lots) have retrofitted wing tanks. If you'd take > this thread to KRnet, you'd probably find one or more. > Mark Langford, Harvest, AL > see homebuilt airplane at http://www.N56ML.com > email to N56ML "at" hiwaay.net > > ----- Original Message ----- > From: D F Lively > To: Mark Langford > Sent: Friday, March 24, 2006 10:07 PM > Subject: Re: KR2s Wings > Mark: > > Yes the Fuel Tank would do that and I am considering that > anyway but leery about opening up the bottom of the wing and > then the integrity of the repair. Anyone ever done a > reto-fit of tanks into the wing? Would like to get rid of > most of the fuel in the cowl tank anyway. > > Don > ------------------------------------------------------------- > > Mark Langford wrote: > > > I don't know. I didn't build mine per plans. Can you > > not put in a stiffening rib inside? Wouldn't a fuel tank > > accomplish that? > > Mark Langford, Harvest, AL > > see homebuilt airplane at http://www.N56ML.com > > email to N56ML "at" hiwaay.net > > > > ----- Original Message ----- > > From: D F Lively > > To: Mark Langford > > Sent: Friday, March 24, 2006 9:14 PM > > Subject: Re: KR2s Wings > > Mark: > > > > They are but do not like sounds that I hear when > > they flex. > > > > How difficult are the wings to redo? Would the > > best way to go be to go down to the spars and > > start over, ribs and all? I am considering > > retro-fitting wing tanks anyway and that might > > require that I redo that area anyway. > > > > Don > > ------------------------------------------------- > > > > Mark Langford wrote: > > > > > I don't know. Mine are carbon fiber and stiff > > > as can be. I would think that they shouldn't > > > be that way, but I'll bet yours are stiffer > > > than fabric... > > > Mark Langford, Harvest, AL > > > see homebuilt airplane at http://www.N56ML.com > > > email to N56ML "at" hiwaay.net > > > > > > ----- Original Message ----- > > > From: D F Lively > > > To: Mark Langford > > > Sent: Friday, March 24, 2006 7:45 PM > > > Subject: Re: KR2s Wings > > > Mark: > > > > > > Still inspecting my project and > > > observed an "Oil Canning" tendencey > > > be rween the spars on the bottom of > > > the inner (2) bays of the out-board > > > wing section when pushed on, is this > > > normal or should they be very rigid? > > > > > > Don > > > -------------------------------------- > > > > > > Mark Langford wrote: > > > > > > > They may be Diehl wing skins if > > > > they have premolded tips, which > > > > would mean that they are basically > > > > 2S wings (that's where 2S wings > > > > came from). The plane at the top > > > > of http://www.krnet.org/ has Diehl > > > > tips (this plane was build by Dan > > > > Diehl). > > > > Mark Langford, Harvest, AL > > > > see homebuilt airplane at > > > > http://www.N56ML.com > > > > email to N56ML "at" hiwaay.net > > > > > > > > ----- Original Message > > > > ----- > > > > From: D F Lively > > > > To: Mark Langford > > > > Sent: Thursday, March 23, > > > > 2006 7:46 PM > > > > Subject: Re: KR2s Wings > > > > Mark: > > > > > > > > Thanks a lot, I will > > > > look! This to me was a > > > > big deal because it > > > > deviated from the -2 > > > > plans and there is > > > > absolutely no way of > > > > telling how it was done > > > > and since it has the > > > > Pre-moldeed tips the tips > > > > extend about 1/2 to 1 > > > > inch beyond the trailing > > > > edge which is what > > > > attracted my attention > > > > and then noticed that the > > > > distance from the aleron > > > > to the tip was way over > > > > plan and that got me > > > > wondering if I should > > > > not go back to "as > > > > designed" but I liked the > > > > added wing area because > > > > it gets the stall down to > > > > the magic 51 mph at close > > > > to 900# > > > > > > > > I did some preliminary > > > > bend stress checking at > > > > 900# and 1260# gross wts > > > > on the center main spar > > > > section and got in the > > > > upper 400's psi anf the > > > > lower 700's psi > > > > respectively which is > > > > well under the 1300 psi > > > > limit I found for Spruce > > > > Bending stress. Not done > > > > with that though because > > > > I do not do this often > > > > and need to give it a > > > > closer look to make sure > > > > I have all the loading > > > > covered. > > > > > > > > Don > > > > -------------------------- > > > > > > > > Mark Langford wrote: > > > > > > > > > There are basically two > > > > > differences in two > > > > > wings. The 2 wing had > > > > > aft WAFs > > > > > (wing attach fittings) > > > > > that were straight on > > > > > the stub spar, > > > > > connected to > > > > > WAFs that were bent > > > > > three degrees forward > > > > > on the outer spar. > > > > > This gave a > > > > > certain amount of > > > > > forward sweep to the > > > > > trailing edge. The S > > > > > uses aft WAFs > > > > > that are ALL bent 3 > > > > > degrees, which doubles > > > > > the amount of sweep of > > > > > the > > > > > trailing edge, making > > > > > the wing more tapered. > > > > > They use the same spars > > > > > (in > > > > > the interest of not > > > > > changing the wood kit) > > > > > but graft on a hoaky > > > > > 12" foam > > > > > spar connected by > > > > > wrapping it with > > > > > fiberglass, and then > > > > > add an 8" foam wing > > > > > tip to the end of > > > > > that. If you'll > > > > > download the AS48/45 > > > > > templates from > > > > > http://www.krn > > > > > t.org/as504x/templates.html > > > > > you'll get a pretty > > > > > good idea of > > > > > what the spars look > > > > > like at different > > > > > distances from the > > > > > aircraft centerline > > > > > (station numbers). > > > > > These are not stock > > > > > airfoils, but like I > > > > > said, may help > > > > > clear things up a > > > > > little. Note the > > > > > phantomed spars at some > > > > > locations, and > > > > > the notes around them > > > > > regarding foam or > > > > > optional or whatever. > > > > > > > > > > Mark Langford, Harvest, > > > > > AL > > > > > see homebuilt airplane > > > > > at http://www.N56ML.com > > > > > > > > > > email to N56ML "at" > > > > > hiwaay.net > > > > > > > > > > ----- Original Message > > > > > ----- > > > > > From: "D F Lively" > > > > > <riksh...@interl.net> > > > > > To: "Mark Langford" > > > > > <n5...@hiwaay.net> > > > > > Sent: Thursday, March > > > > > 23, 2006 7:03 PM > > > > > Subject: KR2s Wings > > > > > > > > > > > Mark: > > > > > > > > > > > > I read a entry on > > > > > KRnet from back in > > > > > 11-03, I believe, RE > > > > > Wing > > > > > > construction > > > > > differences between > > > > > the -2 & -2s. To me > > > > > it seemed to > > > > > > indicate that there > > > > > was nodiffernce in the > > > > > spars and that the wing > > > > > > > > > > > extention were about > > > > > 10-1/2 inches and foam > > > > > construction.with an > > > > > added > > > > > > rib at the end maybe > > > > > only a 3/32 plywood > > > > > added to the outer face > > > > > of the > > > > > > spar to extend them. > > > > > > > > > > > > You seem knowledgable > > > > > and experienced with > > > > > the KR varient designs > > > > > and > > > > > > was wondering if you > > > > > could make how the 2s > > > > > outer wing is built > > > > > more > > > > > > clear. I need to > > > > > know because this > > > > > project I took over > > > > > appears to have > > > > > > 2s wings, anyway the > > > > > Oa lengthof the outer > > > > > wings is 94 to 95 inche > > > > > which > > > > > > gets me to a wing > > > > > area of about 85 SF and > > > > > gets me a theoretical > > > > > stall of > > > > > > 50.87 mph. Can you > > > > > help me with how -2s > > > > > wings are built? > > > > > > > > > > > > Don > > > > > > > > > > > > > > > > > > > > > >
