This type of control horn has too many force transfer points and is more susciptible to long term problems. The biggest advantage it offers is manipulation of the moment arms such that a small servo will serve the purpose just fine. What's the big deal?? CPLR recognized this and uses it to his advantage. So can you.
regards,
MattK
ORIGINAL: jamesjoneill
Hi Jason,
yes they do, although I never worked out why. All it does is transfer the force from the internal pushrod to the two outer pushrods - the same as a Y-pushrod would, and yet it does it with more precision and less slop than most if not all other methods. Thus it should not effect the required overall servo power, that should be governed by the surface size, flying speed etc only.
I work on the principle that I don't require the ultimate in speed (unlike a heli tailrotor for instance), so I might as well go for the maximum torque I can. The theory being that this should allow the servo to hold the surface position no matter what. I have settled on the JR DS8401 as being one of the best F3A servos about at the moment (11kg, 0.18s).
However as with all of these things, personal choice comes into it and if BPLR is happy with the 9254 then fair play. It doesn't seem to be holding him back!!
One thing that occurs to my cynical mind - I wonder if they changed the servo name plate over to psyche out the opposition???
James