Sport Pilot wrote:

The model
diesel engines will not turn as fast as the gas or methanol/nitro
engines because the fuel (ether and kerosene) will not burn as fast.


I say again: there is no magic rule that says "diesel burns slower" than
gasoline. Increasing the boost pressure can increase the burn rate AS
MUCH AS YOU WANT. Its just not done most of the time, because no one
WANTS a 7000 RPM engine when a 4000 RPM engine is available to do the
same job. People only build 7000 RPM engines when there's no other way
to get the power.

This is because the fuel burns slower,
not because of the cycle, because all, the spark ignition gas engine,
the glow plug methanol/nitro engine, and the compression ignition
engine, are actually otto cycle engines.

No, that's already been covered. Diesel (true diesel with either direct
or pre-chamber injection) is a subtly different cycle than the Otto
cycle. Its constant-pressure combustion instead of constant-volume
combustion.