I've just been reading about an interesting experiment that took place in the early 80s. Socata, in a project financed by Lycoming, Primagaz and the French Transport Ministry, clocked up 250 hours on a TB10 converted to run on liquid propane. According to an EADS Socata book, the result was an aircraft that was both faster and quieter than the TB10. The LPG was stored in tip-tanks, which probably made for a more interesting spin if nothing else.
The aircraft was displayed at the Paris Airshow in 1983, but the project was cancelled, apparently when the various partners involved couldn't agree with the French Government on how to tax the fuel!
Plus ca change.
Many thanks to Rod Simpson for the photograph.
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