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
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
Milo, The planetary carrier has the hardened race for a stacked needle
thrust bearing behind it with the other side race of this thrust bearing
against the back cover of the housing. The front thrust bearing hardened
race is against a bolt on flange attached to the prop shaft that the
planetary carrier bolts to the other side of.
This front (for the tractor installatioin) thrust bearing is also restrained
against the housing. The combined planetary carrier/ bolt on flange act as
the thrust ring around the crankshaft. The case back cover is not shown in
the drawings.
It could be a plate like Jeff makes for Tracy's box. There is considerable
gear load from the helical gearing. Inside the planetary drum on the car is
a brass washer for one direction and parts we don't use on the other side.
The little thrust bearing on the accessory end of the E-shaft of the engine
is intended for keeping the E-shaft lobes from walking around and running
against the side housings.
The prop thrust and helical gear load far exceed the capacity of this
bearing. As far as the governor goes, it wouldn't be part of the PSRU but
rather something belt driven off the engine. The propshaft however should
be drilled for the oil passage into the center of the shaft for a constant
speed prop The ability to use the constant speed prop option is what would
provide commercial success of this venture. The governor would be part of
the prop. I am inclined to think the aircraft engine manufacturers supply a
place to mount the governor and only include it as an extra cost assembly.
Better to buy it from MT so it matches up. I don't see what advantage a
"kit" for such a simple device could be. The minimal assembly time is
insignificant compared to the time to machine the components and it would
likely discourage some sales.
george grimes
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