Guys,

Doh. Bellcrank - thank you!!

There are cutouts for 4 servos so you could have 2 ganged in line on each side.

I was fairly OK with this setup until I heard of one crash in Germany after a suspected elevator servo failed.

Sean, I have pretty much all bases covered redundancy/backup wise except this. I agree you can't plan for everything but giving it some thought and putting it out to you guys may come up with a simple answer.

As for movement, to my mind it requires both servos pushing equally in order to drive the pushrod fore and aft. If one servo fails I think the other servo will just be rotating the bellcrank around the 'pivot' of the bellcrank and not 'pushing' the pushrod fore and aft??

This model is so close to hitting 20kg (and the associated hassle in the UK and international comps with this) that Skygate need every oz shaved off where they can hence the reason most fly with this setup.

Jury still out

Rgds,
Mark