This is the initial PSRU design. My CAD designer is using a different
propeller flange design rather than screwed one. When I asked why he
is not using the screwed one these his comments.
"I am certain that the flange using the set screws to has never been
used successfully in practice in a power transmission for an
aircraft. The set screw concept will not support the torque that the
shaft will transfer to the propeller. If you want, I can provide a
model the flange as you have shown but it will most certainly fail in
operation.
The models that I have been working on are sized to handle the 700 Nm
of torque transmission for the duty cycle of the aircraft. The flange
that I has been developed is very similar to the
"tracy-crook-new-shaft2.jpg" image.
Let me know if I should copy the set-screw concept instead of what
has been developed."
Regards
Zahid Rahman
No mention of extended point. I don't think he ever heard of one. The
concept could be an American invention that has not made it to the
UK.
Sounds like he doesn’t understand you can use 24 extended point set
screws.
Is he an engineer or just a machinist? In the UK the engineer name is
applied to many people with out a university degree in engineering.
Ask him to calculate the shear stress on the extended point set
screws and see what he says.
The design submitted is too heavy and the shaft will crack at the
root of the front spline. The designer is a drafts men and not an
inexperienced design engineer. Also very expensive to machine out of
billet 4130 steel and aluminium. The designer obviously has no
experiences designing aircraft gear boxes.
However it is a very pretty dwg :)
Copy the Ross exactly. Have the drafts men draw the Ross and send
that to me. I will check it and make sure the dimensions are the same
as the Ross. Don't send a PDF. Have him give you an IGES file. IGES
files have the dimensions.
Paul Lamar
The attachment shows the 3:17:1 1. This one will go with 135 - 140
HP Single rotor engine ?
2. Can we not use the PSRU combination adapter mount plate ?
Richard with single rotor got 95 HP with 12A. 3. Which base engine
are you suggesting to use for a single rotor with to get 135-140 HP
? Richard Sohn only turned the p-port engine to 6000 RPM. To get
well over a 100 HP you need to turn the 13B or RX8 based single rotor
engine to 8000 RPM with a 3.17 : 1 planetary gear box. The RX8
street car redline is 9000 RPM.
HP = RPM times TORQUE.
Torque is the same more or less and mostly is a function of the
p-port intake manifold length and the displacement of the engine.
If you don't use the adapter plate you will have to make a bell
housing of some sort with built in motor mounts. A sand cast bell
housing is way too heavy. A stock Mazda die cast bell housing has no
provisions for mounting the engine.
Use the adapter plate.
Paul Lamar
Hi Paul,
Do you know if the four pinion and six pinion rear planetary gears have
same dimensions.
Regards
Zahid Rahman
Yes they do.
Paul Lamar
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