As a newbie who only has the skill and facilties to build ARF's and not kits, I understand that we are at the mercy of the suppliers to ensure that the quality of the ARF is 100% pre- sales verified. However, as an engineer, I understand that when I have been given specifications for a machine, I stick to these specifications like glue and will not deviate without prior consent of the manufacturer...in the industry that I work in, deviating from the rules can kill. Another way to look at it, I will not buy a device rated for 240v then modify it to suit 110v for here in the US....that would be crazy! Therefore why would I modify an ARF outwith the specifications of the manufacturer then add a bigger engine just because you are "a horsepower junkie"? Yes, R/C is a hobby, R/C can still kill!

Anyway, I'm not trying to put folk's backs up..

Happy Flying!
Flying Scotsman