Chances are (assuming they're using elec. ignition type engines) the planes you have seen are using a fiber optic servo extension which allows you to place the servo wherever you want to for balance/simplicity reasons and not have to worry about RF interference. Another neat feature is you can run the throttle servo off of the ignition battery and help balance out some of the servo draw. Aerografix sells the fiber optic ext. (http://www.aerografix.com/) The site is under construction but I'm sure Roger could help you via e-mail ([email protected]).

I'm sure we'll be seeing more and more of these being used as the amount of high quaility light weight engines continues to grow. Always better to move the servo up front than to add lead.

...........Mark