MVVS make great engines at a good price: if you want to use a slow revving option the diesel will turn a bigger prop.

I guess you've been using glows in the past, but a diesel would be an option worth serious consideration in that size.

Check this out for the details:

http://www.justengines.unseen.org

but you can get them in the States from Morris Hobbies (if their site is working...):

http://morrishobbies.com/default.php...d5a1902b9528a3

Good luck with your search.