Paul,
I am confused. We were working IAW the attached sketch.
Using a regular 540 thrust bearing instead of a plain bearing without
thrust edges, as illustrated on the sketch.
Do you have misgivings with this arrangement? Milo
Does this help?
Paul Lamar
Help me here, I am sorry, are you saying that the 540 thrust bearings cannot
carry the thrust loads?
Milo
I am saying it is not possible to use them. They are not in the right
places once you cut the Lyc crank shaft down let alone a pusher configuration.
Use needle bearings instead... for both pusher and tractor thrust bearings.
They are very cheap and lube is not an issue.
You will need them for the helical gear anyway as well.
The original Ross had all needle bearings for both shaft and all thrust
configurations. They worked fine for years and they weigh next to nothing.
You just have to be careful when using them in high RPM applications.
Those tiny needles get to go real zinging along :)
2700 RPM for the prop is no problem.
You can't use them on the prop shaft and still transfer the engine oil
pressure to the prop.
Paul Lamar
--
Paul, I am screwed up like Hogans goat. Your expertise in this matter is
far superior to mine, and I am not trying to change your mind I am only
trying to understand. Please do not get frustrated because I am so stupid.
You are a friend of mine and I greatly admire your contribution to our
individual projects. 1st I did not plan on a controller governor to simply
things, reduce wt, and complexity, less cost, etc. 2nd that requires no
cutting on the 540 shaft, and using the regular thrust bearing setup. What
I am not sure of is the shaft machined for pusher thrust loads. 3rd by
bolting the pinion assy. directly to the shaft it becomes part of the shaft
and requires no bearings between it and the shaft because fore and aft
propeller thrust loads are transmitted to the regular engine thrust
bearings. 4th Any helical thrust movement in the pinion assy is already
designed in the pinion and has the ability to slide fore and aft inside the
outer ring. 5th The pinion assy(crankshaft) has the ability to slide fore
and aft on the engine drive shaft caused by heat expansion and helical
movement.
For what-ever it is worth this is what I would at least try do with every
ones input to help me.
For your info I think a kit is the way go, just minimum machine components,
let the guys scrounge the nuts, bolts, gears, etc.
I am in contact with a very reputable Swiss company to produce a machined
kit. Surprising they have asked for specifics, and I would like for you to
be Aero Kinetics, Inc. Engineering Project manager, if things work out I
will be pleased to give you a cut. If we can get a kit to come in at around
2K I think it will sell.
Milo
Not to worry. I'll keep working on the 3D DWG's. It will dawn on you.
It's a combo of needle bearing and one large plain bearing.
The pusher thrust goes through the planet carrier into the case.
Here are some more 3D's.
Paul Lamar
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