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You're right and probably the exception to the rule for some reason, perhaps driven by the AAC within the initial contract.Joe, XP-47A was featuring V-1710 in the mock-up IIRC.
A question about the XP-40Q-3, If I may.
I've read at the Vee's for victory that it's V-1710-121 was able to deliver 1700 bhp up to 26,000 ft. That was WER, with water/methanol injection. Was that engine featured an intercooler/aftercooler?
I don't have to prove it ... read the books. It's in there.
The government didn't officially release the Allison rights until the late 1940's after the war was over for several years. By then, the V-1710 was out of production. In the 1980's the rights to the V-1710 were acquired by Rolls Royce with the intent to kill it off. But the Allison is still beating the Merlin in tractor pulls all over Europe. It got so bad that the Europen tractor pull association enacted a rule to limit the tractor enines to 1650 cubic inches, coincidentally the displacement of the Merlin.
All we did to address that was to install piston liners with 0.1 inch less bore and the displacement was magically down to 1650 and the Allisons still won. When we did that, they relented and threw out the rule, and Allisons are STILL winning tractor pulls in Europe. We have a friensd over tehre running a tractor that can use 2 or 3 Allisons , na dtheya re easily convetered between round to run in different classes.
A question about the XP-40Q-3, If I may.
I've read at the Vee's for victory that it's V-1710-121 was able to deliver 1700 bhp up to 26,000 ft. That was WER, with water/methanol injection. Was that engine featured an intercooler/aftercooler?
I think probably not.
Some 2 stage Allisons did use an intercooler, but those were the earlier ones. And I don't think they used ADI either.
I don't have to prove it ... read the books. It's in there.
The Allison V-1710 engine design was wholly and solely owned by the US Government! Any changes were to be approved by Congress.
Ever try to get ANY change past Congress? Not easy!
You stated that " Any changes were to be approved by Congress"
On the E9 series of of engines, the first two stage engine to reach flight status the revisions to Allison specification No.137 ran from "A" to "G". Are you trying to say that each one of these changes had to approved by congress? Changes to piston rings or piston webbing had to be approved by congress? changes in vibration dampers or even a substitute carburetor or magneto had to be approved by congress?
A change in supercharger gear ratio had to be approved by congress? there were 9 different gear sets, of which 6 were used to any extent.
Owning the basic rights or controlling the export "rights" of an engine is somewhat different than having to approve every engineering change.
How successful the Allison was/is in tractor pulling competitions in the 1970s-2000s has nothing to do with wither congress had to approve engineering changes or different models of the Allison in WW II.