Talk:Republic XP-72

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I updated the top speed figures, based on the August 1974 Wings magazine article on the XP-72 and the Wasp Major engine. There is to clarify actual demonstrated performance, vs planned performance with the later dash 19 supercharged engine.

As the article references interview notes with XP-72 test pilot Tom Bellinger, the reported top speed information should be considered more relevent than the 1961 reference the original Wiki entry was based upon.

[edit] Shaft-driven turbo-supercharger?

I see that this wiki page carries the same general wording as the William Green source: " . . the 28-cylinder Wasp Major, the turbo-supercharger for which was placed aft of the cockpit, being geared to an extension shaft extending backward from the engine . ."

As I understand it, the P-47 fuselage was so large because of the decision to locate its turbocharger aft of the pilot, which meant a large duct (carrying HOT exhaust gas from the engine to the turbine of the turbocharger), and another large duct (carrying compressed air from the supercharger to the intercoolers). It appears the same rationale was used on the P-72; its fuselage is larger than needed merely to fair with the engine diameter, and its three-view clearly shows a ventral exhaust dumpgate ahead of the tailwheel, similar to that of the P-47. So, the question: why drive a turbo-supercharger with both hot exhaust gas and a mechanical shaft? That doesn't make sense, but since Green included it in his P-72 entry, he must have had a reason. Does anybody know??? Raymondwinn (talk) 19:05, 13 January 2008 (UTC)