>From: "Steve and Lori McGee" <lmc...@maqs.net> >15 Gs - hahhah - hehheh - in a tail, thats a good one. > > >----- Original Message ----- >From: "Phillip Matheson" <mathe...@dodo.com.au> > > Reasons > > 1. twisting of the elevator tips > > 2. the mass balance arm and mountings must be able to carry 15 times the > > weight of the mass balance > > ( 12 times minimum and 3 for safety factor). > > >From this I would be concerned at adding 4130 lead filled tubing or >similar > > to my elevator tips.
Steve, I respectfully mention you may want to rethink your comment. Several factors are present in the structural integrity of balance weights positioned forward of the pivot line on aircraft control surfaces. I'm sure an educated structural engineer like Mark or Don could chime in here to expound on my comments but yes, G load would be a consideration due to the forward extended moment of the counterbalance center. As the moment increases, so does the required integrity of the potential point of failure. A pull of G-factor on the airframe would result in an increased load factor on an arm supporting an extended moment/weight combination. Think of it this way: Would 1 lb. positioned at a moment of 8 inches exert the same failure mode as 1 lb. positioned at a moment of 2 inches when introduced to a 4 G pull. I just spent Friday, Sat and Sunday at a formation clinic using the T-34 formation flight manual for a wingman card to allow formation flight performace inside waivered airspace. The carrier brake from echelon requires a 2.5-4 G pull from a 60 degree bank at 150. While this may seem docile to some, remember the load factor on the flying surfaces increase at back increases. Just food for thougt. Dana Overall Richmond, KY i39 RV-7 slider, Imron black, "Black Magic" Finish kit 13B Rotary. Hangar flying my Dynon. http://rvflying.tripod.com/aero1.jpg http://rvflying.tripod.com/aero3.jpg http://rvflying.tripod.com/blackrudder.jpg do not archive _________________________________________________________________ Tax headache? MSN Money provides relief with tax tips, tools, IRS forms and more! http://moneycentral.msn.com/tax/workshop/welcome.asp
