the-plumber

You might want to re-visit the Hitec web site and/or the Hitec forum(s) here - IIRC Hitec has revised their recommendations for karbonite-geared servos and now specify an upper weight limit for the model, and further advise against using the karbonite servos in gas-engined models.

I _think_ I remember reading that in one or another forum, but don't recall which one.