I'm still flying my Carl Goldberg Super Chipmunk. I wish I would have taken the time to install retracts in it. I'm going to strip the covering off and redo the plane this winter. If I can remove the landing gear blocks without destroying the wing I might go with retracts after all.
After a crash and repair I went with an air brushed military theme for fun. That has to go this winter.
But even with the Saito 100 I found it lacking for power. It was just over 8 lbs.
For fun I put a Saito 120S in it. It works very well. Finally happy with the power and I might just leave it in there. It's a touch over 10 lbs now.
But I think if I would have installed retracts in it, it would have flown much cleaner and the Saito 100 would have been fine.
https://www.youtube.com/watch?v=uDbCIRuyICE