need some sagitta 900 help

[alstrahm]

I am restoring an old and beat up sagitta 900. Almost done but have a question from an old mind. All My 6"x5/16[.312] wing rods are bent, all drill rod material. I think one of my old 900's had a titanium rod that did not bend. Any ideas where to purchase one? Thanks.
Al

[jtlsf5]

The best material to replace the old wing rods with is ejector pins, commonly used in machine tooling. This material is very stiff and will not bend. Titanium actually does bend, it just doesn't take a set like steel.

I don't konw where you can get small pieces of titanium, but I have an extra 6.5" piece of 5/16" ejector pin I'll sell you if you can't find anything suitable.

We could probably get this down to you without too much problem, I am in Sacramento and we have some regulars from the bay area that come up to the Davis flying site of SVSS. Let me know if you want to do this.

I might be seeing the Rich Spicer from RnR at an event this weekend. He's in Milpitas.

JT

[Wazmo]

http://www.dixiepins.com/dixie-pins/default.asp

[alstrahm]

JT, thanks for the offer, you would think I would remember ejector pins as I spent 5 years in the injection molding industry in another life. let me see what I can find locally tomorrow. I am not in any hurry cuz I still need to cover the wings. I know a bunch of local guys from here go to your contests and maybe we can work something out for your next contest.
thanks
Allen Strahm

[bobby legue]

Also highly reccommended hilaunch.com
Very helpful to me.
Bobby

[lincoln]

Anyone know the yield strength (and elongation) on these ejector pins? McMaster Carr has them if you need in a hurry. Not terribly expensive either.

All steels are about equally stiff. (i.e. elastic modulus is about the same) (I suppose there may be some exotic exception with lots of other stuff in it.) The difference is in strength, also how it behaves as it starts to fail. (will it bend or break?) While it's true that titanium has a lower elastic modulus than steel and is therefore more flexible, it's very possible to bend it far enough that it stays bent. I used to own 4 bent 3/8" titanium wing rods. One fun thing about titanium is that the cutoff wheel makes spectacular white sparks.