I got the hub back today Paul.
When will the dimension drawings be available?
Tell Frank I will spring for the $250 if you will handle the sales
Milo
Jim Rudholm found some heat sink surplus and much cheaper. I called them and they have 175 in stock. The size is enough
for 3 heat sinks. The cost for 3 would be $25.
Here are the PSRU dwgs.
It would be better if I sent you an IGES or DXF.
What dwg program are you using? The dims are in the IGES or DXF files.
Paul Lamar
These alloy steel screws are 135,000 PSI and the diameter at the root of the thread is at least .2 inches. So the area
is 0.031. Times 10 for ten screws is .31 square inches. Times 135,000 PSI = 42,000 pounds shear.
The bolt circle radius is roughly 1 inch so that is
42,000 inch pounds of torque in theory. Divided by 12 for foot pounds or 3490 foot pounds.
The prop torque is 3.17 times 200 foot pounds engine torque or 635 at the engine torque peak.
That is a factor of safety of 5.5 in theory.
Putting it another way the stress on the bolts is 24,000 PSI in theory.
They should be inspected for cracking at ten hours or so and then once a year there after. Or just put new ones in.
Paul Lamar
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Here is a trick to strengthen the joint about 20%.
Buy longer bolts than necessary so there is a straight section of bolt inserted in the end of the cut down recycled
Lycoming crank shaft.
Drill the end of the shaft for the length of the straight section.
Then cut them off at the desired thread depth.
This is a major improvement from a metal fatigue point of view as you are not starting with a thread notch.
Paul Lamar
Paul I am sorry I did not read your instructions properly. We received your planet carrier drawing ok.
We do not have a drawing program. If we had one, I would not know how to use it! I am very ignorant reference computers. When we have drawings to do, the wife Wenjin does them, but she is at work every day so it takes time for me to respond with a return drawing. milo
Does you wife use Catia?
If so she could try this IGS.
Paul Lamar
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