So I had an idea...not an original one, I have seen an idea a bit like this one before. But this is my version of it.
My idea is a 12 turbocharger cluster-jet using a common combustion chamber. Using theoretical numbers ((very, VERY loose guesses))
This model should produce twelve times the thrust produced by a single example of the turbojet being used. The turbo units in the model are rough estimations of 76mm/3" inducer turbochargers. Really rough math says somewhere between 90 - 151 lbf thrust each. Lets say we get 125 lbf each. That gives 1,500 lbf pre-afterburner.
The unit is 26" wide, 32" tall and 70" long. And weighs an estimated 800-1200 lbs. The PT7675 by Precision Turbo says that one turbo can make over 1,000 hp in a car, 20% of that is 200 hp per turbo. Giving our model 2,400 hp if the combined exhaust was driving a turbine. But since part of the power is used to drive the turbos themselves and only the excess is used to drive the turbine it could more likely end up around 1,800 hp when accounting for generous losses....I think??
I have a 3D model mockup but I can't seem to figure out how to post images.
Last Edit: Aug 18, 2016 12:26:11 GMT -5 by artorius
Part of the weight is a ceramic composite layer on the inside of the combustion chamber. The innermost layer is a super high temperature, heat storing type ceramic in a 1/2" thick layer. This is meant to help increase the temperature that the flame is burning at making the burn more efficient. Behind this layer is a heat-insulating layer also 1/2" thick. This combines to weigh about 100-125 lbs. This is outside of the combustion can. Which might be able to be coated in a 1/16" insulating ceramic that would prolong the life-span of the can. But maybe this isn't practical.
Never mind this...it would melt the burner can like a smelt.
Last Edit: Aug 18, 2016 14:55:33 GMT -5 by artorius
I wouldn't contemplate trying to make a DIY engine of that size , once past a few hundred horsepower we start to get into the realm of commercially made engines where it'd be cheaper to source a time expired unit than make one