Steve wrote:
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.

Hydrogen, for example, is a very rapid burning fuel. Hydrogen can and
has been used in Diesels. I also suspect that natural gas, another
common diesel fuel, burns at a high rate. The slow burn rate with many
liquid diesel fuels is due to the time it takes the surface area of the
droplets to vaporize.