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Areo spike

#3
Or if your really into doing difficult stuff, there was a hobby thing called a pulse jet that ran off GAS. Can still get never been fired ones on fleabay every so often. There is a reason they have never been run..... kinda like a GHQ engine from the 1940's
 

Fluburtur

Cardboard Boy
#5
Pulse jets are still used quite a lot in rc plane, less complex than jet engines.
As for the aerospike, I guess you know it is a type of still experimental rocket engine and not a jet engine that can be used on aircraft.
 

Fluburtur

Cardboard Boy
#7
Yeah probably, if you have the proper materials and can get the model to mach 3 in order to ignite it.
So far the fastest rc model is an unpowered glider with a speed record of about 850kph so you have a bit of a long way to go.