As a former jet engine designer for GE, I can tell you it could cost
MILLIONS more to do it right...and if you make a mistake along the way
you could seriously hurt yourself...and/or burn your house down. Unless
you have some corporate resources (or unlimited personal finances) and
REALLY know what you're doing engineering-wise, I'd highly recommend
against trying to produce your own small turbojet.
I can also tell you that in order to fly turbine models in the USA you
need a special skills cerification from AMA. In general most model
turbines cost from $3000 US upwards...you gotta pay to play. One reason
I don't.
Here's a few more model turbine sources:
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R/C ducted fan installations are cheaper than genuine turbines, though
still expensive. You may want to look into those...though you probably
won't find a thrust rating anywhere near 25 kilos. Design light.
Yeah...just find it interesting how often commercial items are getting
used by the gov (any gov, I suppose...) these days. If it's enough to
hand out pricing breaks and set aside webspace, one has to assume a
substantial market.
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