The person who suggested a Kraft 61 was either joking or does not know what a Keil Kraft Super 60 is!
The Super 60 is a very old trainer and a favorite in England in years gone by, it suits much smaller engines in the .30 range. Might be worth considering electric too.
This same question was posed on the ModelFlying site and had a number of interesting replies see http://www.modelflying.co.uk/forums/...s.asp?th=55526