Carlos:

If you can't find somebody that's done retracts on a Tiger 2 tail-dragger, I'd go look at the "Long Awaited UltraSport Build Thread" and see how the retracts are done there. Both planes are low wingers, the biggest difference is the US has a tapered wing where your Tiger's is constant chord.

If you're going to use mechanical retracts, your biggest problem may be getting the retract push rods to not bind where they connect with the retract servo arm. As I remember, the wing on my Tiger 2 wasn't too thick, and the top of the servo may be far enough above the top of the wing to create a problem.

I suppose you could go to a set of air up/spring down pneumatics, but it wouldn't be cheap.

You'll have a ball with your Tiger, it's a great 2nd plane.

Fred