RE: SPE 43
I think the operative word is "tendency". You would have to agree that a lighter plane flies better than a heavier one.Thats why competition planes strive for the lightest possible setup. Plonking a larger and heavier engine does not necessarily improve performance but it does mean that the Vstall and landing speeds would be higher and handling characteristics altered. If a plane has a "tendency" to be snap happy, the condition will be aggravated with a heavy engine and additional balance weight behind.
What Walt was trying to say is that some planes due to design and heavy airframe (CMpro planes like the Yak in particular) have a "tendency" to snap if the wingloading goes up which is plausible. Using a large and heavy engine will work on some plane designs like the thick foiled stiks but I bet it will not fly better than a lightly loaded one!
I keep my planes light and resort to higher capacity engines only if the weight increase is very minimal.