This note is for Brian Cain.
Hey Brian you made a comment above about a weight code for the
rotor.
This sounds like a perfect opportunity to expound upon our ever
increasing knowledge of Rotary. What weight code were you
refering to?
Is there any markings on our engines that show a weight code? I
am
particularly interested because it would make an inference to
matching
rotors for building engines from parts. Can you enlighten us?
Doug Mueller
13BT RX-6
N900DM
Henderson,NV
"Brian D. Cain" wrote:
Hey Doug,
There's a weight code, to five varying degrees labeled "A" through
"E"
(where weight code "A" is the heaviest), stamped to every rotor on
their
gear side I believe. They're difficult to see on a dirty rotor, but
once
you
give it the spit 'n polish treatment, they're plain as day to see.
According
to the factory shop manual, when assembling an engine, the weight
codes
must be referenced. The rule of thumb is you cannot use a pair of
rotors
where the weight codes are two weights out: For example, if you have
a
"B" weighted rotor, and then your rotary engine buddy down the street
gives you a "D" weighted rotor, they're not supposed to be mated.
But,
if he notices he has either an "A" or a "C" weighted rotor, then
either of
those can be used. I'm not sure of the difference in weight between
"A"
through "E" but I believe it's within grams of one another.
The factory rotating assembly is quite well balanced from the
factory.
Aside from the issue of the eccentric shaft not having a centre
support
to ride on, the engine can be spun very high up from the factory
(8500+rpm).
In any event, make sure you use a weight code that's atleast within
one letter difference, if not the same.
http://bdc.cyberosity.com/pictures/MarioTrevino/EngineRotors1.Jpg
B
Brian D. Cain -/- Grand Prairie, TX -/- bdc196@comcast.com
MSN bdc196@hotmail.com, Yahoo! bdc196, AOL Symajhi, ICQ# 1733105
http://bdc.genxracing.com
http://groups.yahoo.com/group/fc3s_org
http://groups.yahoo.com/group/HaltechSupport--
Hey Brian,
Thanks that is some excellent info. For all you folks building I hope
this doesnt come to you as a surprise but it might make
research for matching parts all that much harder to find.
The AirCraft Rotary Engine NewsLetter. Powered by Linux.
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Copyright 1998-2003 All world wide rights reserved.
"Brian D. Cain" wrote:
I finally found a picture of what I'm talking about. This picture is from
an engine
that I built last October while I was in Lancaster, CA (I'm still upset that
I missed
out on coming over to your place, Paul, had I known). The weight code is
stamped on the gear side, closer to the outer oil control ring, near one of
the
corner seals. The weight code "D" is very visibly stamped on it nearby a
Japanese Katakana symbol. Here's a link to the picture (please
forgive me for the name but I was having a very good day):
http://bdc.cyberosity.com/pictures/BrianSchiller/WhatACleanRotorYo!.Jpg
Brian D. Cain -/- Grand Prairie, TX -/- bdc196@comcast.net
MSN bdc196@hotmail.com, Yahoo! bdc196, AOL Symajhi, ICQ# 1733105
http://bdc.genxracing.com
http://groups.yahoo.com/group/fc3s_org
http://groups.yahoo.com/group/HaltechSupport
The AirCraft Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/
Copyright 1998-2003 All world wide rights reserved.
