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Old Sep 08, 2006, 11:00 AM
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althulas's Avatar
Banbury,Oxfordshire,UK
Joined May 2002
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Quote:
Originally Posted by boomerace
File or grind off to fit and be sure and use heat paste when you put it on! Heat paste is available from Radio Shack.
boomer
Or use some cpu paste from your local computer store. You only need a thin smear to fill in those surface imperfections.
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Old Sep 08, 2006, 11:56 AM
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Syracuse, NY (USA)
Joined Dec 2004
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Thanks. I started to sand the plastic (before I posted the prior msg), but then had second thoughts. I'll probably file the metal (heat sinc) down instead. All I had on hand in the basement was sandpaper, and it was getting late.

The other issue is the heat sinc is a very tight fit (I could not get it ontothe motor - was not brave enough to push any harder!). I think I'll need to bend it to make the diameter/hole larger, or is this normal and I won't damage the motor?

I have very good CPU paste - "artic silver 5".

I had a few markes on the foam that I hid with spackling. The DAP lightweight spackling also hides the foam "beads" with just a very thin coat. I fear those "beads" will show through the (thin coat of) paint. Does anyone ever cover the whole plane with it and does the spackling stick long term? It adds no weight it seems to me.
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Old Sep 08, 2006, 12:03 PM
Off 2 The Edge of Reality
TeamTEOR's Avatar
Scottsdale, AZ
Joined Sep 2003
7,479 Posts
I have yet to see that spackling fall off. Maybe if you got it wet with water it might tho. As for pushing the sink onto the motor, I felt the same way, I was not going to damage the motor to push it on. Is that sink ment for other motors or applications?
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Old Sep 08, 2006, 12:34 PM
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althulas's Avatar
Banbury,Oxfordshire,UK
Joined May 2002
567 Posts
Quote:
Originally Posted by Block
Thanks. I started to sand the plastic (before I posted the prior msg), but then had second thoughts. I'll probably file the metal (heat sinc) down instead. All I had on hand in the basement was sandpaper, and it was getting late.

The other issue is the heat sinc is a very tight fit (I could not get it ontothe motor - was not brave enough to push any harder!). I think I'll need to bend it to make the diameter/hole larger, or is this normal and I won't damage the motor?

I have very good CPU paste - "artic silver 5".

I had a few markes on the foam that I hid with spackling. The DAP lightweight spackling also hides the foam "beads" with just a very thin coat. I fear those "beads" will show through the (thin coat of) paint. Does anyone ever cover the whole plane with it and does the spackling stick long term? It adds no weight it seems to me.
I spackled my fuse and sanded it down 2 times then painted and gave a final coat of polyc/ water soluable floor varnish which gave a vey shiny finish to boot. http://www.rcgroups.com/forums/showt...48#post5770448 post 432
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Old Sep 08, 2006, 02:08 PM
Forever WTTM Pilot #7
Buzz's Avatar
Daytona Beach, Florida, United States
Joined Aug 2002
10,838 Posts
Quote:
Originally Posted by boomerace
File or grind off to fit and be sure and use heat paste when you put it on! Heat paste is available from Radio Shack.
boomer
What Boomer said. I dremeled mine until they fit, then smeard it with heat paste. I never understood why they were all too small to fit on the motor.

Chuck.... I'm stupid today! Explain your sandpaper thing again?

(mutters as he realizes he just cast out bait with a hook, for himself.)
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Old Sep 08, 2006, 02:51 PM
I even seen a house fly!
LedKitty's Avatar
Montreal!
Joined Oct 2003
2,671 Posts
I can't believe I'm being this anal, but being an IT geek, I must emphasize that you want to make sure you have a smooth but thin coat of thermal paste to maximize the heat transfer between the motor and heatsink. If the coat is too thick, it will hamper the heat transfer.

Gazooks that was nerdy of me... :P

In other news I now have nothing airworthy as I managed to pancake (and I use that term quite accurately) my Citabria Pro on Monday during a fit of stupid in questionable conditions resulting from itchy thumbs caused in turn by downright bad weather conditions until then

It is fixable, but it's rather gruesome work, so I'm taking a break from it :\
On a related note, my builds (a Vickers Vimy mk4 and a A6M2-N Rufe) have been progressing quite a bit of late!

While waiting for Fishy's replacement wings, my friend Eric has offered me his old E-Starter so I'll have something to fly FIRST thing I'm gonna do is buy some 2.5" DuBros to replace those hideous plastic wagon wheels @_@ Those things put me into apoplectic fits! hehehe

K
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Old Sep 08, 2006, 03:02 PM
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Joined Jun 2006
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Quote:
Originally Posted by TeamTEOR
Eric I had the same problem, and I never found a fix, I guess I could have used a dremel to take some meat off of the heat sink, but that defeats the purpose. I chose in the long run not to use it. I would be interested in hearing a fix for that as well. I would still like to use a sink on my Feigao 12mm motor inside the IPS box.
I too had to grind the heat sink a little shorter to fit on the stock IPS gearbox. When I upgraded to the Feigao it was a tighter fit, but it was mostly due to the tips being a little 'bent in', I take it from cutting during manufacturing (which is likely why heat paste is so important). Once I removed the sticker from the motor and sanded the inside corners of the heatsink I was able to push it on there. The fit was certainly snug, I didn't have paste at the time and so didn't use any, but it seems to be working well and I don't have the patience to remove the motor again, it was hard enough to slide it in there in the first place. Also couldn't get the screws on it properly, but the fit is so snug it's not going anywhere.

Short story, check that it's not just the corners that are causing all the friction. It was evident on mine as they left scratches on the engines when removed. Once sanded those down it was snug but doable. If I had known before grinding, I would have ground it from both ends to remove any imperfections from the cut as the ground end slid on easier than the other end. May have been just the heatsinks I had, but it's worth looking into as it's easy to sand the edges down a little.
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Old Sep 08, 2006, 04:28 PM
Off 2 The Edge of Reality
TeamTEOR's Avatar
Scottsdale, AZ
Joined Sep 2003
7,479 Posts
Kitty, those wings are in the mail, got the email from them day before yesterday. Sorry to hear about the Pro. I still look forward to the Rufe. Got to love how many time I mad money one someone who thought they needed to use an entire tube of Artic Silver on a CPU. On some older CPUs that have diodes on the top I have seen those areas burnt to a crisp.

I'll need to locate that heatsink again. Now that I have a belt sander and some god dremel bits I can get it onto that Feigao motor. Thanks for the tips guys, I thought it was just me back then and left it off.
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Old Sep 08, 2006, 05:30 PM
The figure "9" Specialist
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A Barrier Island in New Jersey, USA
Joined Oct 2003
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Kitty -

Whose (manufacturer) Citabria Pro do you have?

Thanks in advance...

Aeronca
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Old Sep 08, 2006, 06:22 PM
Registered User
Syracuse, NY (USA)
Joined Dec 2004
2,724 Posts
Doggonnit. GWS stuff is such a headache. I filed down the heatsink and the plastic to get it to fit length-wise. However, not only was the heatsink too long, it also goes too far around the motor. I assume I'm supposed to put the heat sinc in the gearbox opening, and then slide the motor into the gearbox hole and the heatsink. But the heat sinc hits the gearbox and does not go in far enough for the hole in the heat sinc to align with the hearbox holes that the motor goes through. I don't have a dremel, so I hope I don't have to cut the heatsink (I'd have to use a hacksaw).

I have the finne pointed up and the open side of the heatsinc down towards the gearbox. The fins hit the gearbox....seems like I need to cuit a fix or two off, or cut the gearbox a lot. Mayeb I''ll find a picture on here that will help me.
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Old Sep 08, 2006, 07:07 PM
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Syracuse, NY (USA)
Joined Dec 2004
2,724 Posts
Ah, it is the wrong heatsink. Just need to trim it some.


http://www.rcgroups.com/forums/showt...nk#post1544212
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Old Sep 08, 2006, 07:34 PM
Been There! Done That!
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Eugene, Oregon, United States
Joined Sep 2001
19,187 Posts
Quote:
Originally Posted by Block
Ah, it is the wrong heatsink. Just need to trim it some.


http://www.rcgroups.com/forums/showt...nk#post1544212
Yeah it's the one for using the motor without the GB or on the fan! I ordered a couple of those also before I found out the difference.
boomer
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Old Sep 08, 2006, 08:02 PM
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Syracuse, NY (USA)
Joined Dec 2004
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My LHS only had one of these...I was so happy to find it at the time and they assured me it was the right one...well, it pretty much is. I'm unsure how I'll cut it. Hacksaw or metal file I guess. My wife just gave me some wine, guess she's trying to get me drunk, so maybe I shouldn't use a hacksaw. :-)
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Old Sep 08, 2006, 11:10 PM
Crash tester
Drunkskunk's Avatar
Texas
Joined Sep 2006
850 Posts
Well now I've gone and done it!

I did it. I admit. I bought one. I didn't realy mean to. It was just there, calling my name.
Now it's home, along with $$$ worth of other odds and ends I needed. And yet, I have no darn clue what to do with this thing.

So here's my real delima. Most of the posts in this thread are about building it ultra lite and floating it around on almost windless days. I'm in Texas. The wind doesn't stop. If I want to fly, I'll have to put up with 10mph winds. So how heavy can I build this?

Another problem I have is what ESC to use. the hobby shop sold me a 5 amp unit to go with it, but it seems like that might be a little small, especialy if I use an 800mha battery.

And another thing.. heh.. Can you tell I'm going about this all wrong? I'm diving in hoping to learn to swim before I drown.. What mods should I consider doing now, in the initial build? I see there are a half million mods in these29 threads. I want to try some eventualy, but which ones should I consider during the initial build that would be hard to do later?
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Old Sep 08, 2006, 11:22 PM
Off 2 The Edge of Reality
TeamTEOR's Avatar
Scottsdale, AZ
Joined Sep 2003
7,479 Posts
Man, that is the same sink I have too, time to caulk it up! I'll order the right one. I am kinda bummed out here. It is not Moth related, so I'll kinda save the long story. Short story is I have a defective motor for my new heli that was supposed to maiden on Sunday. looks like it is going to need to wait a few.
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