I have a friend (who has the title of being the first jet flyer in my area) who flies a DV8R with a 20lb turbine. It weighs 43lbs at takeoff. It takes a minute for it to bet up to speed but once its there there is nothing to it, flies beautifully, just like a big pattern ship. I'm guessing top speed is around the 150mph range. In fact, he let several people fly this jet on a buddy box (its what got me hooked on jets). Not sure why he put a 20lb turbine on this jet.

Not saying that you should follow his steps, just saying that don't rule it out, it can be done successfully.