Robinson Hot Aire engine running

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Tom Jamboretz

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I have just finished making a Robinson hot aire engine from castings I bought from Polly Model Engineering in the UK. It was touch an go trying to get it running. Mostly from air leaks I could not find easily. It runs very nice now. Attached is a recent photo. The thermo siphon tank is 4" x 4" . It is running on propane made form a torch. TJ

DSCN9772.jpg
 
I find that pressurizing the cylinders through the transfer port between hot and cold sides with a blow off nozzle from a compressor set at low psi reveals the internal leakage area.
 
Good job indeed. You've done well - they are notoriously "testing" to get running right.
 
Good idea about pressurizing to find leaks. I'll try that when it stops performing. TJ
 

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