Spiraling Slipstream?
I have the Global 25 sized Me-109 with a 40 FP on it. It requires near full right rudder on take off and if I advance the throttle too quickly it will pull to the left no matter how much rudder input there is. The plane has as much rudder throw as I can possibly get on it. Once in the air it is a fine flying ship. A little Toe-in did help.
Just don't hold full up elevator and hold the tail on the ground until take-off like I see a lot of the people at our field do. They often cartwheel the plane down the runway after tip-stalling it just after breaking the ground and blame it on the wind.
A little off the subject.....I use it for combat. I had a midair with a Sig Wonder and chopped it in about 5 pieces. I T-boned the wonder and went right through it. When it hit there was a loud whack. The wonder looked as if it had really exploded and pieces slowly rained down. I thought my plane was a gonner until it flew out of the Wonder debris. I landed with the motor still running. About an inch of one of the prop blades was missing and the cowl was cracked. This also happened infront of a crowd of probably 500 (?)people. I felt really bad about it but couldn't stop laughing. The guy with the Wonder, who I know, didn't look too happy when he saw me chuckling. Those Germans could sure build tough planes......
Here is a pic. It has seen better days.