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Single stage and two speed versions were;
-45
-57
-93
-97
-101
-109
-111
-131
What do you mean by "internal spur" gearing? Epicyclic gearing was also sometimes referred to as planetary spur gearing.
My understanding is that to have EPICYCLIC gearing, some of the gears involved in the system must, a/ rotate about their own axis and, b/ must also rotate, as a whole, about a common point. The Earth rotates about its own axis AND it also rotates around the sun, hence PLANETARY movement.
In both the diagrams you provide, conditions a/ and b/ are met, thus they are epicyclic or planetary gearing systems.
Internal spur gearing is where the pinion on the end of the crankshaft meshes with a surrounding ring gear that has teeth on its INSIDE. Both gears rotate around their own axes but NOT around a common axis.
P.S. "auxhiullery" is spelt AUXILIARY.
Also, from the above cut-away it looks like the V-1710's supercharger had a vaneless diffuser.
Dan Whitney's Vees for Victory is incorrect in this regards. Theres a nice list published by Air Material Command which gives the model designations of USAF engines including details on usage, powers, displacement, supercharger details, prop details etc.
KK,kool kitty89 said:Admiral, looking through the data (as well as some articles on the P-39/P-63) most of those 2-speed engines you refer to are actually the early 2-stage versions. (lacking intercooler) It is mentioned in the engine description, though only one impeller size is mentioned.