er yes, the piston engine will always be more efficient! That's why all the existing Gas turbine cars and trucks are in museums now!
Aircraft gain their advantage by using TurboFans (kind of mix of turbojet and large lower reving fan)flying at high altitude and carrying a load of passengers, then fuel per passenger per 100 miles becomes very economic looking.
Avionics, Not sure where you got 200 N from, I see the quote as 200 Lbs cargo, that would need (in turbojet terms) at least a reliable 230 Lbs or 1000 N thrust, that relates to a Mass Flow required of about 3 kg/sec.
with a stator outlet temp of 1080 k (bordering on the need for Turbine cooling) An engine that size would be more powerful that the average commercial APU... A seriously major project
We did this a few years ago using a Jetcat P120, the bearing will fail after 2 hrs.
if the JetCat P200-SX Turbine so bad would you recommend the Behotec B300F from http://www.altecare.com/behotec300.htm
Have you looked at the Wren turbo prop engines, they make a Helicopter model too
I believe the turboprop produces above 50 lbs of thrust.
With the weight range you are talking about model engines are not going to make it since model aircraft are limited to 55 lbs. ( at least in US)
What are you trying to lift?
sgt ric what i do not get is why cant you just install a micro fuel pump to the turbine wouldn't the vertical problem