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ronb9956
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I’m interested in your views on whether any significant thrust could be obtained using the cooling air and exhaust gases from a model aircraft engine. International class control line speed models (known as F2A) achieve speeds of around 300 km/hr using 2.5cc engines and tuned pipe exhausts that allow the engines to generate around 1.5 KW of shaft power at 40,000 rpm. Assuming about 20% efficiency, that means there is at least 6 KW of heat energy being added to the exhaust air from engine cooling and exhaust gases. The latter leave the tuned pipe at around 350 C. Photos and drawimgs of typical models can be found at http://www.f2aspeed.org/gallery
I’m thinking that if the tuned pipe were totally enclosed in a cowling, and the heated air mixed with exhaust gases then exited through a nozzle, some net thrust might be achievable. Any thoughts on this would be appreciated.
Ron
I’m thinking that if the tuned pipe were totally enclosed in a cowling, and the heated air mixed with exhaust gases then exited through a nozzle, some net thrust might be achievable. Any thoughts on this would be appreciated.
Ron
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