-- 
Paul Lamar
-- 
I can loan you mine, but I won't get it out till Monday.
C. Smith



Great I'll see if I can find one today. If I fail I'll
take you up on the loan. Then we will build a proto
for testing.

Jeff says he will make ten sets at a time for
$300 each set. So we need to get ten people together.

Paul Lamar


I am still good for one...

Kevin DeVore
Kerrville, TX

Hi Paul,

Just picking up on this thread, and..  Not sure I've seen the rational for
"why". That being said, I'm aware that Tracy's current version of the drive
has no damper (and does not use the flexplate) That is what he is flying on
the RV-4 and will be changing the RV-8 20B setup to the same. This comes
with a new limitation...  No Metal Props..! (apparently no one is using them
anyway) Though I'm aware that that is Tracy's direction, I'm not aware of
the reason to do so...? From an engineering standpoint (which I'm not by the
way..) I guess I'm in the dark as to the rational. I'm simply a consumer..
I currently have Tracy's 2:85 with the damper/flexplate arrangement. I guess
I (as will others) entrust this decision to...????  Tracy is a pretty smart
guy currently flying a non dampened set-up (again, I've not heard why)

Paul..  you're a pretty smart guy too...  and I appreciate the last thread
that this seems to be being made to the market (me and others) already
possessing drives, so...  Perhaps I missed were the collaboration was to go
in opposite directions.  Maybe some who are reading want to see where your
idea will end up...  as Tracy is flying his set-up. That is also very
convicting.  Perhaps as Tracy has made clear...  No Metal Props. Maybe this
is for those doing just that....???(using metal props)  I know what the
recips do to some wood and fiber props (Ivo), but...  This is a rotary and
drive set up, not Cont.'s or Lyc.'s.   Just seems to be some grey area is
all.

Thanks,

bruce Buksyk


I can't read Tracy's mind but the rest of the world has been dealing
with props as well as other high rotational inertia devices mounted on gear box's
and shafts driven by  intermittent internal combustion engines for a 100 years.
Motor cycle drives are good examples. So too clutch plates in manual transmission cars. Auto trannies have fluid torque converters.

Let me know when he has a 1000 hours on it :)

I just bought a $1000 gear box that connects a turbine to a diesel engine.
Guess what? It has a fluid coupling to deal with the power pulses.
These are used in million mile over the road tractors as in" tractor
trailers".

Tracy has been selling a flex plate drive with ineffective rubber
bushings for years. Rubber is no longer rubber when it is completely
enclosed.

It resonated at 1800 engine RPM. I flew back
from Reno with Dave Leonard in his turbo 13B and I noticed he set less
than 1800 engine RPM on final approach. Dave is among those people that have
destroyed flex plates and sheared pins in sun gears.

In some cases heavy flywheels  bolted directly to the crankshaft
are used to mitigate the torque pulses. Every automotive piston engine that
I am aware of uses a torsional damper on the nose of the crank.

The latest is sheared bolts in planetary ring gear bulkheads.

Paul Lamar


Thanks for the reply Paul..

For the record, I've never installed Tracy's drive.  I has a Ross unit I'd
sent back to Chris (Ross) years ago, and..he fixed it and...    sold it to
someone else.!  I was out $2500 bucks and my drive and lost a lot of trust
in this movement.

I love your idea and have waited on each new drawing..etc.  I just didn't
(don't) know what's going on.  By your comments on using screws instead of
rivets. I'll assume there have been some issues. (?)

The aviation community are great people.  I respect your decision in your
approach to this all and am being led that way (will likely be one of your
needed ten) I'm also aware that it seems the right hand and the left may not
know what each is doing...  and I get that.  We're human..  and frankly I
don't need to know the personals.  Was just curious (and you somewhat
addressed that..) in going with a different method to attach the spline.

Thanks for your frankness.

bruce



The Rotary Engine News Letter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net
You Tube http://tinyurl.com/beqqxas
Copyright 1998-2013 All world wide rights reserved.