Call me crazy but, I make some .0049 engines and will sell them for 1.2 billion dollars each. It's over powerful for the Funtana 40 and if you do put it in the Funtana 40 DO NOT FLY ABOVE 1/3 throttle. Also use a 20lb lead block for counter weight. You will also need to sign some release forms if you use it on the funtana 40. This engine will however, fly a 1/2 scale just fine as long as you use crow. This may be illegal for me to sell such a powerful engine so don't tell on me.