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
Milo,
Was your initial question about using a Lycosaur 540 in a pusher about using
the complete engine or just the large bearing part of the crankshaft to build
a PSRU?
Dale Davies
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