Speed 400 tailplane stresses? - RC Groups
Thread Tools
Oct 10, 2009, 04:03 PM
Registered User
golem's Avatar

Speed 400 tailplane stresses?

Dug this plane out of mothballs a couple weeks ago and will be upgrading to brushless. Beginning to get curious as to how much stress is imparted on the horizontal tail surfaces which are only Monokoted 3/32" balsa (12" width) and whether it should be a concern? With a 10.5% airfoil she's not likely to be a real speedster but I'd rather beef up the stab than rebuild after a failure.

Last edited by golem; Oct 10, 2009 at 04:10 PM.
Sign up now
to remove ads between posts
Oct 10, 2009, 05:02 PM
Registered User
peterangus's Avatar

Try this static test.

With the motor at full whack, apply full up and full down elevator.

If it shows no sign of distress, that should give some reassurance.
Oct 11, 2009, 10:22 PM
Registered User
golem's Avatar
Thanks, I'll give it a go.

A bit of musing --- For some reason my thinking is there really are minimal forces being placed in the rear horizontals. To me seems the stabilizer simply cuts through the air with the only stresses placed on it coming from the elevator while in deflection, which shouldn't be all that great at this size and speeds.


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Anybody use two packs for speed 400 twins? Daniel English Electric Plane Talk 69 Feb 26, 2014 05:49 PM
best speed 400 plane? kartman24 Electric Plane Talk 31 Feb 04, 2014 12:41 PM
Speed 400 Pusher peterv Electric Plane Talk 16 Jun 15, 2006 06:43 PM
Speed 400 Q-tee Greg Bartel Electric Plane Talk 3 Apr 28, 2001 02:34 PM
Speed 400 Batteries mt_100 Electric Plane Talk 3 Apr 24, 2001 01:28 AM