substitute aluminum for 4130?

"ChuckSlusarczyk" wrote in message
...
In article om, Bob
Kuykendall
says...

...
where it folds over and sticks to itself. AC43.13 change 2e will
address the repair of duct tape laminates, with specific reference to
brand-name materials that went off the market in 1974.

Hmmm I guess we would need to know the section modulus as well and the
moment of
enertia of th section .Maybe a composite of duct tape and cardboard would
give
better stifness .Ahhhh the possibilities are endless :-)

Chuck (tape 'er down boys tape 'er down ) S


Actually, it should be the optimal substitue for Stitts fabric / Polly blah
blah blah - Duct tape is both self stick and pre-finished...

--
Geoff
The Sea Hawk at Wow Way d0t Com
remove spaces and make the obvious substitutions to reply by mail
When immigration is outlawed, only outlaws will immigrate.

As I remember , it was the substitution of alum. instead of AN Steel bolts
that caused a Thorp T-18 to lose a wing panel at the EAA International
fly-in many years ago , would really want to do the numbers before I would
substitute any material on an aircraft , just the opinion of an old A/C
welder.
Phil Lohiser
Middlefield , Ohio
"Robert Loer" wrote in message
...
Plans call for wing spar to fuselage carry through attach fiitings to be
7/8x1/8 4130 steel. Advisability of using 9/16x 3/16 6061-T6 aluminum as I
have it on hand.

Your thoughts please. I have plans for another ship which uses the
6061-T6.

Thanks

Phil wrote:
As I remember , it was the substitution of alum. instead of AN Steel bolts
that caused a Thorp T-18 to lose a wing panel at the EAA International
fly-in many years ago , would really want to do the numbers before I would
substitute any material on an aircraft , just the opinion of an old A/C
welder.
Phil Lohiser


I remember another that crashed because the builder used pop
rivets in the spar fittings instead of the AD rivets the plans called
for. Too many homebuilders have died because they made substitutions or
other changes without the knowledge necessary to do it. The designer
often has obscure but important reasons for the materials he specifies,
and the naive builder doesn't realize the peril he creates for himself
and others when he decides that he knows it already.

Dan