Agreed. I built a Sig Kadet LT-40 from a kit. Yes, this is a largish 40 trainer with 900 square inches of wing but I heard they tended to build a little tail heavy. Instead of a lightweight plain bearing 40 engine as shown in the instruction manual I opted to go with a ball bearing 46. With that setup, my LT-40 balanced perfectly with no added balast. I HATE adding dead weight to ANY aircraft.

Certainly not a speed demon, with the TT Pro 46 and a low pitched 11-5 prop, it jumps off the ground and can climb not quite vertically. I do NOT recommend overpowering a trainer when it is being used for basic flight instruction.

When I was on the buddy box with my LT-40, the instructor tended to fly mine around at full throttle. When I started getting more control of it I backed off the throttle about halfway and had a very enjoyable flight experience. At full throttle it climbs excessively, requiring quite a bit of down trim.

Now with over 100 successful flights, we've moved the CG back a tad and have bumped up the throws a bit as well. The TT 46 Pro still has plenty of "oomph" for basic aerobatics.

Now that I'm anxious for more advanced aerobatics, I'm progressing to a Sig 4*60 ARF powered by a Saito 100.