Sig Rascal 40 - Ground Handling Problems?
 

I have a Sig Rascal 40 running a Thunder Tiger 46 Pro 2-stroke engine. The plane has always been kinda squirrely on take off...doesn't track very straight at all. Anyone else have this problem?

RE: Sig Rascal 40 - Ground Handling Problems?
 

As light as the plane is, and with its long tail moment, it will weathervane very easily if you're taking off in a crosswind, plus it does what all tail draggers do when you hit the throttle--turn left if you don't counter with right rudder. It's probably the most difficult plane I have to keep straight on take-off; I practice with it for that reason.
You might want to play with the landing gear and bend the axles to toe in the wheels a little; just enough to notice they're not parallel, a couple of degrees. Toe -in makes the plane want to self correct its straight ahead roll.

RE: Sig Rascal 40 - Ground Handling Problems?
 

Another thing perhaps worth trying: take the undercart off and reinstall it back to front so the wheels are a little closer to C of G. It may not look quite right but may improve ground handling.

Mine's not too bad on the ground (grass), but on the odd occasion, I have got into a bit of an overcorrection cycle with it on take off than can look kinda messy.