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Rotary Engine Con Rod Crank Pin Assy

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75Plus:
Does anyone else find it odd that the Hydra has an even number of cylinders? I cannot remember ever seeing a radial engine that had not either an odd number of cylinders or a multiple there of. The P-47 of WWII fame had two rows of 9 cylinders while the B-36, which never dropped a bomb in anger, had 6 engines each of which had 4 rows of 7 cylinders.

All the WWI rotary engines in the Air Force Museum have an odd number cylinders also.

Joe

tinkerer:

--- Quote from: 75Plus on December 06, 2009, 08:43:19 PM ---Does anyone else find it odd that the Hydra has an even number of cylinders? I cannot remember ever seeing a radial engine that had not either an odd number of cylinders or a multiple there of. The P-47 of WWII fame had two rows of 9 cylinders while the B-36, which never dropped a bomb in anger, had 6 engines each of which had 4 rows of 7 cylinders.

All the WWI rotary engines in the Air Force Museum have an odd number cylinders also.

Joe

--- End quote ---
I did find that odd also. I have worked on several and they were either 5 or 9 cylinder. Never considered that even numbered even existed.

sbwhart:
Hi Chaps

Domestic duties kept me out of the shed today, that and its bloody cold, well for us soft limies it is.

Spent a bit of time in the nice warm house doing a bit of CAD on the crank shaft design, until I'd drawn it out I thought it would just be a simple off set of the con rod, but no on the origional cygnet design the master rod is quite thin 1/8 but in this design this doesn't matter because of the way the bearing is orientated, but the new design requires a thicker rod to give the bearing a bit of width so you have to give the slave rods a bit more crank. Anyway after bit of fidling and head scratching  :scratch: came up with this design.



I'll have to machine the con rods up with an angled web, this goes against my origonal objective of keeping the maching simple, and I've not yet worked out how to machine them.

So what do you think mmmmmmmmmmmmmmmmmmmmmmm

Stew

Stilldrillin:

--- Quote from: sbwhart on December 18, 2009, 04:34:20 PM ---I'll have to machine the con rods up with an angled web, this goes against my origonal objective of keeping the maching simple, and I've not yet worked out how to machine them.

So what do you think mmmmmmmmmmmmmmmmmmmmmmm

Stew

--- End quote ---

Hhhmmmmmmmmmmmmm.............  :scratch:  ::)

David D

Bernd:
Stew,

I'm thinking side forces on the whole assembly.  :med:

Bernd

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