Martin, I think the 10x10 prop wouldbe good for CL, but IMO it just isn't the easiest to get to know the engine.
What I wrote above, I'm sure of!
But the following is just my opinion, I've never used American commercial fuels.
I get the impression that there are commercial interests involved. Calling diesel fuel "1/2A fuel" or "ABC fuel" implies that you need various different diesel fuels for different engines, which just isn't true, except for fixed compression.
Consider the situation of making up your own fuel, which is all the commercial guys are doing. If you have enough ether content and enough oil content, then any variable compression diesel will run on it. The fact that you may be able to get away with a little less ether or oil, in certain engines,doesn't justify making such a fuel if the basic fuel runs the engine OK. IMHO it's just naughty commercial practice aimedat people who aren't familiar with diesels. It's a logic of "why sell one can of fuel when we can sell two!" It's perfectly possibleto makeone fuel blend that suits all variable compression engines... I'm a life-long diesel lover, and it makes makes me a bit cross to see people inventing constraints and requirements thatjust don't exist.
Apologies for the soapbox!
Brian