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Just remember that when one uses a modern engine to replace those of yesteryear a problem soon becomes apparent. The old engines usually had a max rpm in the 1400-1700 range while more modern engines are usually up in the 2600-3000 range. Hence the old engines produced a lot more torque per rpm. What it boils down to is that when one uses more modern engines you can't use a scale propellor. Newer propellors have smaller diameters to efficiently use the power available for the lower-torque, higher-rpm modern engines. However, this said, plenty of people use modern engines because they have no choice......certainly understandable. The aircraft sound different from the originals but that's a pretty small price to pay to be able to get up into the air.
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