Doug, Paul

I'd like to learn more about using a taper vs a spline for the prop hub.

Could either of you offer any additional commentary on that?

Thanks
Ken Bauman

Ken,
Me too!
I had a quick look on the Internet and found reference to 'Morse Taper'
which is 5/8" per foot. I haven't checked the Mazda taper as yet.
There are 'Taper Locks' devices available also, but I kinda like the idea of
having a keyway like the Mazda e-shaft.
Anything over 16 degrees isn't considered self-locking and shallow tapers
are considered the best 'self - locking'.
There are a number of slightly different tapers designed by different
companies for different applications ( I suppose).

If you find anything more appropriate to our particular needs, you would be
so kind as to share the information.
George ( down under)

The best reference I know for information on tapers is the book
_Machinery's Handbook_ that has been published in consecutively numbered
editions since early in the last century.  There are dozens, if not
hundreds, of  "standard" tapers.  Many of them were developed and
promoted by particular machine tool companies.  (It reminds me of the
current camera flash memory situation.)

A taper that might be appropriate for this application is the taper that
Continental used on the range of air cooled Standard Military Engines
that they developed during the 1960's for general purpose military use.
It is 0.200 inches/inch or about 11.3 degrees.

Aubrey

I recall Everett Hatch saying (years ago) that the taper on the Mazda
flywheel took the entire torque load.  The key is only there as an
index.  He was really big on researching details.  Had gobs of NASA
references and such.


Mike McGee, RV-4 N996RV, O320-E2G, Hillsboro, OR
13B in gestation mode, RD-1C, EC-2

Yes I actually visited Everett a couple of times at his farm in Oregon.
When we went out to a local restaurant for lunch he would bring along
his copy of Taylor :)

The Internal Combustion Engine in Theory and Practice.

Volume 1: Thermodynamics, Fluid Flow, Performance. Second Edition
Revised.

Volume 2: Combustion, Fuels, Materials, Design. Revised. Charles
Fayette Taylor. The MIT Press Cambridge Massachusetts, and London
England.