Yeah .... I checked with the girrrls early on and they could not help me.
Great resource though.

---

From: Tom Walter <roundrocktom@yahoo.com>
Sent: Sunday, July 18, 2010 9:08 AM
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Tie Down Hardpoints

Thomas,

No idea what plane you are building, but Cozy Girls had some plates made from
aluminum and alodined. http://www.cozygirrrl.com/aircraftparts.htm

With threading, generally depth should be 1.5 times the bolt diameter -- for a
steel bushing. So 1/4" bolt, means a 3/8" steel bushing is fine. I like to go a
little thicker with aluminum (you mentioned 28tpi which implies steel, as for
aluminum I would use 20 tpi). 1/4" steel plate seems almost too heavy. 0.071"
4130 plate with a welded in bushing would be fine. Primer and painted and no
rust worries (My fuselage is 4130 tubing).

Tom Walter





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