12 b
Paul
You forget about the bolting attachment of the Ford drum plate to to
your design which is additional weight , to compare with my design is
close to your design weight.
I will send you the design later.
Jean Proudhomme
I don't use that Ford part. I fasten the sun gear to the hollow 1.5
inch input
shaft with extended point set screws. They work like splines but
are much lower cost. Tracy used a pin to fasten the sun gear to a one
inch shaft. That failed on Dave Leonard's turbo. It was also welded.
I think you where on the News Letter when that happened.
This is much stronger.
Here it is complete with sun gear.
Paul Lamar
Paul
It look very good design, i am wondering if you use the existing steel
space for your sun gear shaft hole alignment, with my design you do not
need to use it , the flywheel is straight adjacent to the counterweight
and the damper block, it look like a small difference in weight between
the spacer and the ford drum.
Sun gear attached and shaft with those set screw are the best but they
have to be very secure.
JEAN PRUDHOMME
There is a hole in the end of the e-shaft for the pilot bearing.
The rubber bushings will hold the set screws in the coupling block.
Another way is to insert a thin aluminum sleeve in each large hole.
Locktite would also work There are twelve so if one comes loose no big
deal :-)
On the gear end you can use belt and suspenders and weld the front.
Don't weld
the back site as that might weaken the shaft. However the 1.5" inch
hollow shaft is
way over kill for 500 HP.
Given 300 foot pounds which is what you would have with 500 HP the shear
force on a one inch shaft is 3600 pounds I think.
The same torque on a 1.5" shaft is 2400 pounds. Each screw takes only
200 pounds.
Check my numbers.
In this case and aluminum sleeve would also work to keep the screws tight.
Here is something cool if you want to get fancy. It is possible to add a
torque meter
just like a PT6. What that does is measure the unscrewing load on the
helical sun gear.
Exactly like a PT6 gear box.
It is also possible to do away with the sun gear thrust bearing and
allow the e-shaft
thrust bearing at the rear of the engine (aircraft) to take the gear
thrust load. I have
no experience with that so do this at your own risk.
Paul Lamar
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