Hi John, Still not with you buddy on the "today's servos.........torque is not an issue". Physics is physics. Aerodynamic law pertains whether the surface is driven directly or with linkage. If one gains (for arguments sake) double the power by a 2 to 1 linkage advantage then your system will need twice the amount of servos to deflect the same surface the same amount of deflection. This is like telling an engineering professor that you can lift a 50 ton beam with a 25 ton jack, your rational is that the jack travels 12" but you only need to go 6". I'll give you the "no machine is 100%" but by no means will two ballinks rob 50% power from the servo.

Would you advise a client to use only two 8611a's on a 52" 7 x 4.5" tapered aileron delivering 35 degree deflections with your system?

As for the gromets producing more slop than the gear lash, can't walk down that road with you either. You will have some motion but not more than the moving of the servo arm. Plus the most play the gromets will render would be at high deflection (i.e. 3D rates) where resolution is not much of an issue. At neutral we'd see little play and most of it is caused by motor vibration. How do you supress motor vibration on the direct drive system with out something that absorbs the vibration like the gromets?

Just like today's servos produce more power than yesterday's, today's servo arms produce less flex than those of yesterday as well. There are double arms that have no flex.

Again, it's a cool process and I"m glad you've got tons of proven flights on yours. I'd be happy to fly with you if I get down your way some time!

Take care..........Mark