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Additional thought (or question...).
With most soft coupling designs, if the soft part fails, the hard
parts can rattle against each other but motive force is still
transmitted, at least for some time (hopefully long enough to get
back on the ground safely). What happens with your design if the
soft part does fail? (Failure analysis shouldn't assume no
failure; it should ask about the results of a failure.)
Please know that we're all grateful someone is trying to make
drives available. I'm hoping that I'm giving constructive
feedback; not criticism.
Charlie
On 6/23/2017 11:55 AM, Charlie England wrote:
Isn't that average torque? The pulses
are nowhere near as bad as a piston engine, but peaks are
significantly higher than average. I can't help but think that
if soft couplings worked at shaft diameter, we'd see a lot more
of them in production use (I haven't).
But I'm not creating things, I just assemble others' stuff. :-)
On 6/22/2017 11:23 PM, Neil Unger wrote:
Charlie, the torque from the engine is something like 280 Ft/
Lbs from memory. This coupling was tested at 400 ft / lbs
with just a slight movement. Time will tell who is right.
Neil.
On 6/23/2017 12:46 PM, Charlie
England wrote:
Uh, not that I know anything, but
if I did, I'd say I see your problem. :-) Isn't the stress
on a soft coupling that close to the 'axle' going to be
massive? I thought that the whole reason for putting the
soft components out at some significant radius from center
was to reduce the load on them.
Charlie
On 6/22/2017 8:50 PM, Neil Unger wrote:
All , As usual I forgot to attach a photo, This is the
first one with the green Polyurethane flex that was a
failure. New one has a further lightened Alloy base with
a rubber flex. Neil.
On 6/23/2017 11:40 AM, Neil
Unger wrote:
Kelly and all, The flexdrive I now have under test for
the new redrive bolts directly onto the E shaft and is
not connected in any way to the flex plate, other than
to hold it onto the E shaft. I originally used
polyurethane as the "Flex" but it disintegrated within
hours.
Next was to go back to a flex rubber vulcanized
coupling that looks great but yet untested. The rubber
is the same as engine mount rubber and if that fails
there are many grades of rubber available. Results
shortly once I get my new Fuel Tech ECU to actually run
the engine!! Neil Unger.
On 6/23/2017 11:15 AM, Kelly
Troyer wrote:
Mark,
The RD2C direct "Rigid" connection from
flywheel to the Redrive is somewhat a mystery to
me and I suspect to most on the "Flyrotary"
list.........I have never seen any photos of this
setup and only vague descriptions.........I do
not know if any on
the list purchased A RD2C and am aware of only
the one installed on Tracy's RV8.........
If any on the list has more knowledge or
actually has seen one please speak up and provide
photos if possible.........I personally have gone
with the a (13 lb) steel flywheel and the"Soft"
damper provided with the RD1C by Tracy......This
is the "Fix" for a failed Gen 2 flex-plate used by
Dave Leonard on his Turbo/13B RV6 while racing at
Reno..........
Kelly Troyer
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