Brian
Thanks for the comments. Didn't know you had an Avon doing its thing at Sale, presumably linked to a generator via some extra stages of turbine at the tail pipe.
But how do you get the gas fuel into an Avon? The avtur fuel nozzles would be useless. What gas feed pressure do you need and what is its operating RPM and EGT.
A few years ago I found a couple of Avons, one ex Canberra and one ex Sabre, back of a workshop at Richmond NSW. Both less auxilliary gearboxes so no starters. Ethusiasm had one running using a truck starter motor attached to the gearbox drive shaft and a burning oxy torch poked into a hole where an igniter had been removed. Wish I had had a camera handy.
Perhaps I once flew your Avon.