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SafeAirOne
Joined: 18 May 2008
Posts: 17
Location: Manchester, NH
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 Posted: Sun May 18, 2008 12:51 pm Post subject: Aluminum Sources / Bending Brake... |
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Hello Everyone,
I've just received my set of drawings for a plans-built 701, and I have my first few (of many) questions already...
I'm trying to plan ahead and see that the wing spar caps are .093" thick, 90-degree extrusions. None of the common (and economical) sources sell 3/32" thick (.0938) 90-degree extrusions called for in the plans. What are all you scratch builders using for wing spar caps? I presume that the answer is 1/8" (.125) thick extrusion with an appropriate-length solid rivet.
Speaking of aluminum, what is the most economical source for 6061 T6? Wicks is the cheapest I've found so far, with Airparts, Inc. coming in a close second. Are there any other sources that might be cheaper?
Finally, what is the longest part I'll have to bend on a brake? I've scanned the plans and think it's the horizontal stabilizer rear spar (at) 2220mm (7'-04" or so). Are there any pieces longer than this that will need to be bent in a brake?
Thanks,
--Mark
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John Bolding
Joined: 23 May 2006
Posts: 281
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| Posted: Sun May 18, 2008 2:21 pm Post subject: Aluminum Sources / Bending Brake... |
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Mark, Trident Metals and Yarde Metals are both Industrial Metal houses
with large stocks and several warehouses, I've ALWAYS found metal cheaper
there. They have sheet as well.
The .093 is a special Zenith extrusion available only from them, as far as
anybody has discovered to date. Weight penalty using the 1/8" is about 4#
and price savings of $300 last time I figured it. Zenith approves the
substitution.
The longerons are a little longer but only if you want to bend them full
length instead of splicing them as in the plans.
John
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