my new carbon fiber cheetah!

[kfxguy]

what prop u running?

I dunno yet. I have about a dozen different ones up to a 51mm. Im sure this motor will turn any prop I throw at it. Lol

[kfxguy]

Why don't you care for the servo plate? I build almost all my cats with them. I think they look a lot bettet than any other mount. Plus you get the additional carbon bling.

Sorry. Didn't see your post. I think it takes up too much room to be honest. I think it looks good for sure, but could be half the size. If I don't get ride of it, it will be because its carbon and has snazzy looking logos in it.

[kfxguy]

Im pretty excited! I did something really cool (I think) to my hatch. Over the course of a few days I added expanding foam to it. Once it cured (I kept cutting the middle open because it wasn't curing) I cut it to shape. Then I sanded it flat. Of course I checked the motor clearance lol.
Then I made a template like I do for my inlays. I transferred the shape to some cf cloth. Then I used cf resin to attach it to the hatch. The idea is a slick look and keep water out of the foam. Tell me what you think......
Foam after cutting and sanding
20131125_194158.jpg

The carbon spray glued on
20131125_200247.jpg

Finished. I think it turned out pretty nice!
20131125_201631.jpg

[kfxguy]

And this is what spray foam does. Was shocked when I cut it open.....

20131124_105429.jpg

[TheShaughnessy]

I was wondering about the foam melting from the resin.

I'm also wondering why you used CF as a cooling jacket. While it does look good CF isn't the greatest material for heat transfer. See chart http://www.christinedemerchant.com/c...ductivity.html

When there exists a temperature gradient within a body, heat energy will flow from the region of high temperature to the region of low temperature. This phenomenon is known as conduction heat transfer, and is described by Fourier's Law. (Quote from site previously linked to).
I've always viewed a cooling jacket as a heat sink in addition to allowing water direct contact with the motor can. Carbon simply doesn't allow the amount of heat transfer Al or Cu are capable of.

You seem pretty handy why not make one out of copper? you can see in the chart i linked to Cu is only beat by slver and diamond which obviously wouldnt be cost effecient. I fashioned a jacket for my 1515 1y out of a scrap piece of 2" copper pipe. I had to reduce the diameter which I did by removing a section and then soldered it back together using the cut out section. You may not have to do much if you have a 1717 , a 2" piece might be the perfect size.

Just a thought.

[rickwess]

And this is what spray foam does. Was shocked when I cut it open.....

[ATTACH=CONFIG]108512[/ATTACH]

Stop using the spray foam in a can! With all the CF you're using, surely you can splurge on some 2 part foam?

[dasboata]

This is what I use in all my building job it also help in making the hull stronger http://aeromarineproducts.com/boat-foam.htm

[kfxguy]

I was wondering about the foam melting from the resin.

I'm also wondering why you used CF as a cooling jacket. While it does look good CF isn't the greatest material for heat transfer. See chart http://www.christinedemerchant.com/c...ductivity.html

When there exists a temperature gradient within a body, heat energy will flow from the region of high temperature to the region of low temperature. This phenomenon is known as conduction heat transfer, and is described by Fourier's Law. (Quote from site previously linked to).
I've always viewed a cooling jacket as a heat sink in addition to allowing water direct contact with the motor can. Carbon simply doesn't allow the amount of heat transfer Al or Cu are capable of.

You seem pretty handy why not make one out of copper? you can see in the chart i linked to Cu is only beat by slver and diamond which obviously wouldnt be cost effecient. I fashioned a jacket for my 1515 1y out of a scrap piece of 2" copper pipe. I had to reduce the diameter which I did by removing a section and then soldered it back together using the cut out section. You may not have to do much if you have a 1717 , a 2" piece might be the perfect size.

Just a thought.

The resin didn't melt the foam. That was uncured foam on the inside. Secondly.....if I needed heat transfer from the air colling something off....I would have made the jacket out of metal. Because it is water cooled, im using water to do the heat transferring. Everytime I check the temp, the can is completely cool. I guess I see no reason to worry with it. Lol.

I probably could have done it out of copper or aluminum,

But I really wanted a carbon one. I honestly feel the water will be enough to draw the heat away. You have to also consider the fact that the can an the motor don't even touch metal to metal but are separated by o rings which kills a bunch of that heat transfer.

[Fella1340]

the hatch looks excellent, you just cant resist that spray foam can you? I hope you've put it away for the rest of the build!

[TheShaughnessy]

You are probably right it won't make a diff carbon fiber vs copper. I used copper o rings thermal transfer paste and silicon. I figured the water would carry away heat from the motor and heat absorbed by the jacket. I push the motor pretty hard and thought copper would be optimal, not to mention it didn't cost me anything. http://forums.offshoreelectrics.com/...cooling+jacket. Forgot to link to the pics of mine.

[kfxguy]

You are probably right it won't make a diff carbon fiber vs copper. I used copper o rings thermal transfer paste and silicon. I figured the water would carry away heat from the motor and heat absorbed by the jacket. I push the motor pretty hard and thought copper would be optimal, not to mention it didn't cost me anything. http://forums.offshoreelectrics.com/...cooling+jacket. Forgot to link to the pics of mine.

Nice cooling jacket you made!

[kfxguy]

the hatch looks excellent, you just cant resist that spray foam can you? I hope you've put it away for the rest of the build!

Heck man...I spent like 5 bucks on that can of foam....I was trying to get my moneys worth! Lol

[Fella1340]

Put down the can and back slowly away from it with your hands up.....

[kfxguy]

Put down the can and back slowly away from it with your hands up.....

Lmao!

[kfxguy]

I had to test it to make sure it floats. Well it does. Lol

20131128_100953.jpg


I apologize this build is going pretty slow. I've got other things going on right now and im still waiting on parts from hobby king......been over three weeks. Ill rethink it next time I go to order from them. I order stuff from china alot and usually takes a week or so. I did get started on my recovery boat today and its near finished. Its turning out pretty dang nice. It has lots of carbon fiber used on it.