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<DIV>
<DIV>I usually balance the back plate first, then balance the pair
assembled. I also index the backplate and cone so they are re-assembled
the same each time.</DIV>
<DIV> </DIV>
<DIV>Don</DIV>
<DIV> </DIV>
<DIV>In a message dated 12/20/2006 5:40:20 P.M. Pacific Standard Time,
trexlesh@msn.com writes:</DIV>
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<DIV>
<DIV>I am wondering how many balance the spinner assembly... I've
been doing that for years, and I can tell you that I haven't found one
yet</DIV>
<DIV>that didn't need some major grinding. I usually also index the
spinner to the backplate so that every time I have it off and on, it goes back
</DIV>
<DIV>together the same. I always do the indexing first, putting the
heavy side of the spinner to the light side of the backplate. It helps
by offsetting the the imbalance and eliminating a bit of grinding to get it
all in balance... I don't know how important it is on a fuel motor, but
I assume it could have a dramatic effect on the small bearings in the
outrunners....</DIV>
<DIV> </DIV>
<DIV>Rex</DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="FONT: 10pt arial"><B>From:</B> <A
title=mailto:chad@f3acanada.org href="mailto:chad@f3acanada.org">Chad
Northeast</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A
title=mailto:nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, December 20, 2006 5:17
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Cooling
outrunners</DIV>
<DIV><BR></DIV>Hi Dean<BR><BR>The bearing life on my motors has been good, I
have an old 30-10 pushing <BR>500 flights, and my Evo is around 250-300 I
would guestimate.<BR><BR>The bearing issues on the Pletty motors seems to me
to be very related <BR>to prop balance. I use a small aluminum 8mm
bushing (the TT one for <BR>spinners actually) that fits right in the molded
part of the hub <BR>center. APC drilled holes are often not properly
centered so that helps <BR>to ensure I am running the prop as concentric
with the motor as <BR>possible. I know guys have hurt bearings on
these motors running either <BR>the Pletty motor in the nose (In my mind
that system has huge potential <BR>for imbalance) and using APC's drilled
hole without balancing the prop.<BR><BR>Just some of my thoughts on bearings
:)<BR><BR>Chad<BR><BR>Dean Pappas wrote:<BR>> Hi Chad,<BR>> Yes
everything gets better when you don't have to run at peak load very
often.<BR>> Hey ... that's how the best wet setups work too.<BR>> If I
can get the motor temps down without too much fuss, I always will:<BR>>
not just the magnets, but the bearings and gearboxes like it too.<BR>> I
am still waiting to see what happens long term with outrunner
bearings.<BR>><BR>> Why? In the CL Stunt setups, the first couple of
tries with planetary gearboxes were ALL abject failures.<BR>> Gearboxes
were failing in literally a handful of flights. Stunt ships corner hard
(maybe 90 degrees in 1/3 second)<BR>> and we are currently seeing
everything from ~80 flights to >300 flights before outrunner bearing
problems start.<BR>><BR>> Back to RC and heat.<BR>> I block 50% of
the air to the battery (one cheek inlet) with a foam rubber plug on<BR>>
days under 70 F (~20 C) and at maybe 55 F (15 C) I take a piece of tape and
cover half of the remaining inlet.<BR>> That allows me to keep my 5300s
up to maybe 95 ~ 100F on cool days. <BR>> I typically get a 40 F (20 C)
rise on warm days with everything opened up.<BR>> I am also on the
throttle a bit more on hot days.<BR>> The Extremes will be welcome in
that regard.<BR>><BR>> later<BR>><BR>> Dean Pappas<BR>> Sr.
Design Engineer<BR>> Kodeos Communications<BR>> 111 Corporate
Blvd.<BR>> South Plainfield, N.J. 07080<BR>> (908) 222-7817
phone<BR>> (908) 222-2392 fax<BR>> <A title=mailto:d.pappas@kodeos.com
href="mailto:d.pappas@kodeos.com">d.pappas@kodeos.com</A><BR>><BR>><BR>>
-----Original Message-----<BR>> From: <A
title=mailto:nsrca-discussion-bounces@lists.nsrca.org
href="mailto:nsrca-discussion-bounces@lists.nsrca.org">nsrca-discussion-bounces@lists.nsrca.org</A><BR>>
[mailto:nsrca-discussion-bounces@lists.nsrca.org]On Behalf Of Chad<BR>>
Northeast<BR>> Sent: Wednesday, December 20, 2006 12:37 AM<BR>> To:
NSRCA Mailing List<BR>> Subject: Re: [NSRCA-discussion] Cooling
outrunners<BR>><BR>><BR>> Hi Dean<BR>><BR>> Quite true about
the magnets, but I have flown with my motor at 150F and <BR>> on days
where it doesnt get above 65F....I can not tell the difference <BR>> in
performance, probably because there is such excess power in these <BR>>
setups to start with.<BR>><BR>> Pack temperature on the other hand is
very important, OAT below 10-15C I <BR>> have to start restricting
cooling on the batteries or they dont get warm <BR>> enough to provide
good power. The new extreme packs are better about <BR>> this than
the Prolites, but still very noticeable on certain days.<BR>><BR>>
Chad<BR>><BR>> Dean Pappas wrote:<BR>> <BR>>>
Bob, you're a genius!<BR>>> I suggested this to an E-powered CL Stunt
buddy in the Netherlands <BR>>> some months ago because the Stunt guys
have a long history of styling <BR>>> planes with chin scoops placed
far back. These often require a 3/4" <BR>>> long prop drive extension
to place the cylinder back farther, and the <BR>>> use of a short
venturi. They cowl much easier than computer carbs!<BR>>>
<BR>>> Hi Chad,<BR>>> Makes you wonder what some of these guys
were thinking when they <BR>>> placed the cooling and cheek inlets. ??
**^^$$!!!<BR>>> The inlet airbox can shroud the aft end of the motor
and the sleeve <BR>>> dump into a front exit plenumm. Now the trick is
the exit from there. <BR>>> I think that a big elbow like a turbopropo
exhaust would be cool, as <BR>>> would be cheek cowls with no entry
holes just exits. The exit plenum <BR>>> just behind the spinner would
have to duct into the cheeks. Notre that <BR>>> flying without a
spinner will wreck the cooling! A row of exhaust <BR>>> stacks like a
P-51 could be boxed in and used to suck the warm air out <BR>>> of the
exit plenum. I need to draw a picture. That'll take a while, <BR>>>
especially around Christmas.<BR>>> <BR>>> The colder the
magnets are, the stronger they are, and the less <BR>>> resistive the
copper is, so cooler is always better for the motor. The <BR>>> same
is true for the ESC: MOSFETs are less resistive the cooler they <BR>>>
are, so everything gets better in the Antarctic except battery <BR>>>
performance.<BR>>> <BR>>>
later,<BR>>> Dean<BR>>>
<BR>>> <BR>>><BR>>> Dean Pappas<BR>>> Sr.
Design Engineer<BR>>> Kodeos Communications<BR>>> 111 Corporate
Blvd.<BR>>> South Plainfield, N.J. 07080<BR>>> (908) 222-7817
phone<BR>>> (908) 222-2392 fax<BR>>> <A
title=mailto:d.pappas@kodeos.com
href="mailto:d.pappas@kodeos.com">d.pappas@kodeos.com</A><BR>>><BR>>>
-----Original Message-----<BR>>> *From:* <A
title=mailto:nsrca-discussion-bounces@lists.nsrca.org
href="mailto:nsrca-discussion-bounces@lists.nsrca.org">nsrca-discussion-bounces@lists.nsrca.org</A><BR>>>
[mailto:nsrca-discussion-bounces@lists.nsrca.org]*On Behalf
Of<BR>>> *Bob
Richards<BR>>> *Sent:* Tuesday, December 19,
2006 9:27 AM<BR>>> *To:* <A
title=mailto:chad@f3acanada.org
href="mailto:chad@f3acanada.org">chad@f3acanada.org</A>; NSRCA Mailing
List<BR>>> *Subject:* Re: [NSRCA-discussion]
Cooling outrunners<BR>>><BR>>> Is there
any reason why you can't duct the air to blow into
the<BR>>> rear of the motor, and provide a way
for it to escape from the front?<BR>>>
<BR>>> Geez, I'm just thinking that leaving
the spinner off, or use a<BR>>> really small
spinner, would be the way to go.<BR>>>
<BR>>> Bob
R.<BR>>><BR>>><BR>>> */Chad
Northeast <<A title="mailto:chad@f3acanada.org>/"
href="mailto:chad@f3acanada.org%3E/">chad@f3acanada.org>/</A>*
wrote:<BR>>><BR>>>
The problem with a lot of composite fuse models
(Twister<BR>>>
included) is<BR>>>
that the inlets in the chin and cheeks are often right at
the<BR>>> rear
or<BR>>> even behind
an outrunner.....so ducting toward them is
very<BR>>>
difficult.<BR>>> I
have to agree that a proper ducting system is crucial
for<BR>>> cooling.
I<BR>>> use a very
simple short radius 90 bend in a peice of
depron<BR>>> that
pulls<BR>>> air in
from the chin, I see about a 20C rise in temp
without<BR>>> it,
other<BR>>> than that
I dont really do anything special. The motor
will<BR>>> operate
at<BR>>> up to 170F
without complaining so as long as its 20-30F
below<BR>>> that
all<BR>>> is good
:)<BR>>><BR>>>
Chad<BR>>><BR>>>
------------------------------------------------------------------------<BR>>><BR>>>
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href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</A><BR>>>
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