Wed Dec 15, 2010 1:14 pm
Wed Dec 15, 2010 10:45 pm
greatgonzo wrote:Yes, yes, I know the way constant speed propeller works. I m ean I wouldn't design the system but I have the picture . The question is were the crosschanges possible by CE props - did CE continue to manufacture the blade mounting system with no changes for 6 series. It's logical, but is it real? The other possibility is the change of a spline in the engine, or is it?
The P&W Graham White's book says all the C series engine equiped Thuntherbolts used C642-B40 propeller. I still can't find out is there any connection of the number with the shape of the blade and if the mysterious C-642-B ever existed.
Its easier with HS. Only one type on P-47s.
51 fixer - thank You for Your answer. Moved me a step forward and they all count .
Thu Dec 16, 2010 12:11 am
Thu Dec 16, 2010 7:02 am
A 60 spline "C" series crank will not fit in a 50 spline "B" series case, as far as I know. The nose case for the "C" series engine is completely different than a "B" series. I will have to give it some more thought on the interchangeablity of the propeller. I would recommend contacting Butch Maxwell of Maxwell propeller at Crystal Airport, Crystal Minnesota. He is still working on counter-weighted HS props and I think he does Hydo-matics as well. He is a real sharp guy, and he might be able to answer your question.
Thu Dec 16, 2010 11:36 am
greatgonzo wrote:It is. But the possibility of changing the prop by changing the shaft is a thought too. The reduction case is different in C series but it does not mean the shaft has to be different from engine side. I doubt it would be the same becouse of different gearing systems used by R2800. It is possible to overcome in theory, but I suspect it would need presise tooling as the shaft would have to be dismantled and rebuild and balance problems could have arise.
The real, real question is what was going on with CE P-47 props. I have 3 and let's say 1/2 types of propellers and five confirmed configurations.
I'll try to look for the guy. Thank You for all the help.
Thu Dec 16, 2010 1:32 pm
Thu Dec 16, 2010 2:54 pm
greatgonzo wrote: C542S-A6 (toothpick) and later –A114 (asymmetrical Paddleblade) propellers.
Thu Dec 16, 2010 4:32 pm
Thu Dec 16, 2010 5:50 pm
greatgonzo wrote:I've seen this page before, but missed one thing. The #2 Shank is repeated in both series (I probably was to lazy to check the new word in the dictionary ). It would suggest the blades to be interchangeable. This could cover the field modifications. I still wander which screws have been mounted on M/N Thunderbolts on the line. The source I mentioned gives B40 for all off them. And which blade is '40'?
The shaft itself could be the same, but I think more of that wheel shaped collar attached to it supporting the planetary reduction gearing. As Republic used three gearing ratios for A/B series and another two basicly for C series, the part would't be the same for all of them. I don't know is it possible to change these parts, but they look like fixed to the shaft strongly to me. But it is another story now.
Fri Dec 17, 2010 5:58 am