I also have a stinger 40.
I have a irvine quickie 500 engine on it. It is a 6,5cc (.40) only turns a little more RPM than a normal.
When putting a serieus engine on this plane, then it will be fast.
And it is for sure, not a second plane. An old puma from robbe, whit the same engine, can't hold up whit this baby.





when you need more pictures let me here, i will posted, what you like to see