Original Posted By: Craig Lawler
Not much has been said here about the wing spar fittings at the top ofthe wing struts. On the Scout drawings the spar fitting sticks outperpendiular to the spar. ALL these fittings should be in line with thewing struts AT THE SAME ANGLE! I believe the Air Camper drawings showthem at at an angle but not in line with the struts. One of the guyshere mentioned this in passing but I think more attention needs broughtto it.Earl MyersNot much has been said here aboutthe wing sparfittings at the top of the wing struts. On the Scout drawings the sparfittingsticks out perpendiular to the spar. ALL these fittings should be inline withthe wing struts AT THE SAME ANGLE! I believe the Air Camper drawingsshow themat at an angle but not in line with the struts. One of the guys herementionedthis in passing but I think more attention needs brought toit.EarlMyers________________________________________________________________________________
Pietenpol-List: wing spar fittings
Pietenpol-List: Re: wing spar fittings
Original Posted By: Earl Myers
The Citabria had problems with the straps at the outboard end of thelift struts. An AD was issued and everyone had to change their straps.They went to a channel shaped strap (always in line with the line of theforces). Of course the Citabria is aerobatic and subjected to up to 3Gnegative loads.Lauren mailsorter-101-2.bryant.webtv.net (8.8.8/ms.adl.990907) with ESMTPDate: Thu, 16 Sep 1999 11:45:05 -0400________________________________________________________________________________
The Citabria had problems with the straps at the outboard end of thelift struts. An AD was issued and everyone had to change their straps.They went to a channel shaped strap (always in line with the line of theforces). Of course the Citabria is aerobatic and subjected to up to 3Gnegative loads.Lauren mailsorter-101-2.bryant.webtv.net (8.8.8/ms.adl.990907) with ESMTPDate: Thu, 16 Sep 1999 11:45:05 -0400________________________________________________________________________________
Pietenpol-List: Re: wing spar fittings
Original Posted By: David Swagler
I was sort of ignoring this thread until I realized what it was about. TheChristavia also uses a C-chanel of 0.090 plate. there is only one chanelper strut end and is located on the inboard faces of the spar. There isalso a 1/8" plate fitting that sits inside the chanel giving almost 1/4"of metal holding on those struts. The outboard sides just have the 1/8"fittings. The reasoning given by the designer was that in a hard landing,the struts ends tend to be pushed apard and the fitting can actually bebent as a restult. The chanel stiffens up the fitting.KenOn Thu, 16 Sep 1999, Lauren Williams wrote:> The Citabria had problems with the straps at the outboard end of the> lift struts. An AD was issued and everyone had to change their straps.> They went to a channel shaped strap (always in line with the line of the> forces). Of course the Citabria is aerobatic and subjected to up to 3G> negative loads.> > Lauren> > Ken Beanlands B.Eng (Aerospace)Calgary, Alberta, CanadaChristavia MK 1 C-GREN________________________________________________________________________________
I was sort of ignoring this thread until I realized what it was about. TheChristavia also uses a C-chanel of 0.090 plate. there is only one chanelper strut end and is located on the inboard faces of the spar. There isalso a 1/8" plate fitting that sits inside the chanel giving almost 1/4"of metal holding on those struts. The outboard sides just have the 1/8"fittings. The reasoning given by the designer was that in a hard landing,the struts ends tend to be pushed apard and the fitting can actually bebent as a restult. The chanel stiffens up the fitting.KenOn Thu, 16 Sep 1999, Lauren Williams wrote:> The Citabria had problems with the straps at the outboard end of the> lift struts. An AD was issued and everyone had to change their straps.> They went to a channel shaped strap (always in line with the line of the> forces). Of course the Citabria is aerobatic and subjected to up to 3G> negative loads.> > Lauren> > Ken Beanlands B.Eng (Aerospace)Calgary, Alberta, CanadaChristavia MK 1 C-GREN________________________________________________________________________________