Dave,

the servos are fine and a good choice. At least that's what I'm using.

The e-tracts I haven't tried in that size. There are some comments about the nose gear being a little delicate on the electronic side when used with glow engines - due to vibration. I think if you take a little time to insure the wiring is well soldered, protected from vibration and you mount the unit with some sort of damping means, you should be ok. Of course, if one uses an electric motor, then there is no issue.

What engine/motor were you going to use again?

I have used the smaller 10-15 and 15-25 e-tracts and they have been reliable, even with glow engines.

David