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Old Jan 19, 2015, 02:31 PM
Dave
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Putnam Valley, NY
Joined Sep 2007
727 Posts
Build Log
R2 Hobbies 36" Silver Cat Build

I just received the hull, and I am impressed with the quality. The plan is to do a single Tekin T8 motor, which I had laying around, and a 180AMP ESC from Offshore Electrics. It will run on 5 or 6 cells. I am waiting for all the drive componenets coming from Hong Kong. Meanwhile, I began decorating the hull, and figuring out how to make a water cooling jacket for a finned motor, designed for air cooling!

Enjoy the photos.









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Old Jan 19, 2015, 09:25 PM
RcBoater
Joined Feb 2014
272 Posts
Me again. Reason water intake at the bottom with exit on top is so all of motor gets water and bubbles will exit too. Make sure the esc gets water first and then to motor and you don't need a whole lot of water to exit but a small stream is plenty, This way the water will pick up more heat on the way out.
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Old Jan 19, 2015, 10:06 PM
Dave
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Putnam Valley, NY
Joined Sep 2007
727 Posts
Got it thanks. I plan on bonding in, a 3 or 4mm brass tube tangential to the bottom and then exiting tangentially at the top in the opposite direction to create a rotational flow around the motor can.

The O-rings are in very snugly and it's very difficult to force the sleeve to move by hand. I expect it will fully seal as it, however, I do have a second square profile seal that will get glued in to form "end caps".

I may do separate water pickups for motor and ESC, if not, I will put the ESC first.

Thanks for the pointers. I can't wait til Spring!
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Old Jan 21, 2015, 09:03 PM
I feel the need for speed!
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Southern U.S.
Joined Jun 2008
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I made a waterjacket out of PVC one time, worked very well and yours should do fine, looks nice in the clear too. What kv is that motor and what size?
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Old Jan 21, 2015, 09:36 PM
Dave
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Putnam Valley, NY
Joined Sep 2007
727 Posts
It's a rebuilt Tekin T8 Gen 1, with a 2250kv rating. Not ideal but it was free. Tekin says it will handle 5S fine, but not 6S. We are going for top speed runs anyhow. Last time we ran this motor in a boat, it was melting EC5 connectors on 4S, but it seemed to run less current, and cooler, on 5S. I am not sure exactly why.

On the cooling jacket, I plan on gluing in some brass fittings this week and testing it on the bench.
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Old Jan 22, 2015, 11:15 AM
Dave
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Putnam Valley, NY
Joined Sep 2007
727 Posts
So what happens when you are waiting for parts, get bored, and have too much coffee too late at night... and you find a roll of white pinstriping...

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Old Jan 22, 2015, 11:34 AM
I feel the need for speed!
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Looks very nice!
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Old Jan 22, 2015, 01:09 PM
RELAX. You'll live longer
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Brisbane- Australia
Joined Jul 2007
3,413 Posts
It's not too often that Asymmetrical designs are used on boats. Yours looks great.

A guy at ur club brought one of these hulls for show & tell last weekend. I was impressed with the sharp edges & overall finish on the boat.
A nice wide strip of cloth over the deck joint around the inside of the boat too. That's a plus.

Cheers.
Paul.
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Old Jan 22, 2015, 05:52 PM
Dave
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Putnam Valley, NY
Joined Sep 2007
727 Posts
Thanks, I have mixed feelings about the asymmetry, but next will come some lettering, and some "sponsor" stickers to help balance it out.

I finished the cooling jacket today. It holds pressure, and it should cool very well with the submersed finned surface . ;-)

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Old Jan 23, 2015, 01:01 PM
I feel the need for speed!
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Southern U.S.
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Cooler looks great, seems that it will hold a larger volume of water than a standard one too. I also like how the water will flow around it in a circular fashion to the exit. I don't know your thoughts but i sure dont look forward to soldering wires to those tabs, they are so close together, i did it once and didnt care for it...............it will obviously work though.
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Old Jan 23, 2015, 01:15 PM
Dave
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Putnam Valley, NY
Joined Sep 2007
727 Posts
Thanks. Yes, I wanted a circular water flow over the fins. The secret to soldering tabs that close is to have a powerful iron. Quick melt and quick cool.

I bought the clear tubing on McMaster. I had the o-rings already but they have a large selection in metric and standard.
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Old Jan 23, 2015, 03:14 PM
I feel the need for speed!
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What year is the Z in your Avatar photo? Looks like a 240.......72, 73?
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Old Jan 23, 2015, 03:43 PM
Dave
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Putnam Valley, NY
Joined Sep 2007
727 Posts
Good eye, but it's a trick. It's actually a 76 with 72-73 style bumpers.
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Old Jan 23, 2015, 03:57 PM
I feel the need for speed!
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Southern U.S.
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Yeah, it did throw me off, cuz i know those bumpers, but the side and wheels kinda threw me, is it a 260 then?
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Old Jan 23, 2015, 04:59 PM
Dave
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Putnam Valley, NY
Joined Sep 2007
727 Posts
75-78 was the 280Z. 74 was the 260z. Early 74 is a 260z built on 240z chassis. Late 74 was a 260z based on a 280z chassis.

I have the 76 and a 72.
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