The LT40 is rated at 5 1/2 to 6 lbs. The PT60 is listed as 7 to 8 lbs. Both planes are very close to the same size but the LT40 will fly well on a 40 and fly awesome on a 46. Someone suggested the Sig Kadet Senior kit. I don't suggest it because it only has 3 channels and is not a strurdy build. Its fuselage is made of a bunch of sticks glued together to form the shape. Bump it too hard on the run way and the tooth pick pile can be very hard and time consuming to repair. The LT40 fuselage is made of aircraft ply which is much stronger and more suited to training. Combine it with a n OS 46AX engine and you will be a happy flyer!