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R2 Hobbies 36" Cat build.

R2 Hobbies 36" Cat build.

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Old 01-19-2015, 03:18 PM
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Default R2 Hobbies 36" 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 01-19-2015, 03:36 PM
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You might want try less cells with that motor or get a low kv motor to run 5-6 cell lipo.
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Old 01-19-2015, 03:44 PM
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You think? It's a 2250kv motor. Will 5S-6S over spin it? I used to run it on 4S but with 5S everything seemed to run cooler...if that's possible.

EDIT: Yup. This page spells it out nicely.

http://www.radiocontrolinfo.com/rc-b...ss-boat-motor/

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Old 01-19-2015, 05:56 PM
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Go with a motor with a cooling jacket and motor like this and you will be a lot more happy, just not sure how good your homemade stuff would work.

http://www.offshoreelectrics.com/pro...artan-Combo-v3
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Old 01-21-2015, 03:41 PM
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Excited to see the completed boat
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Old 01-28-2015, 10:12 PM
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Some updates.

I did some more graphics on the hull in silver carbon vinyl, and white pin striping.

I received the hardware and installed it. I made a backing plate out of Delrin to help support the rudder/strut. I installed the drive tube and shaft. I completed the cooling jacket for the Tekin, and it holds pressure. It also has a lot more volume than the typical cooling jacket which is good for burst cooling. But, I did decide to pickup a different motor too. I will complete the boat with the Tekin motor, but I will switch to the leopard motor when I am more comfortable with the boat.

The Leopard is a 4200 watt 4-pole unit 1480kv. That's about 5.6 Horsepower on 6S at 115 amps. I got a good deal on ebay for it. I think it's too much power but we shall see.












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Old 02-11-2015, 05:59 PM
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The motor was too high for the cowl, so I cut and lowered the "firewall", and removed some ply from directly under the motor, for clearance.




Rear battery location gives a good CG location.



Used a Traxxas truck box to keep the Rx dry, and the wiring tidy.



Ready for Spring.

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Old 02-12-2015, 06:57 AM
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Turned out nice.
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Old 02-12-2015, 10:55 AM
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Excellent build, should be fast as hell.
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Old 05-01-2015, 07:51 PM
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Well, you be the judge. It still needs some strut angle and depth adjusting, and I think the rudder is a tad too small, but when it settles in a straight line...


+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.


https://www.youtube.com/watch?v=_HPXtfW6Kdg

Build tip:
Add glass reinforcement under the deck, around the four corners of the hatch opening. It begins to crack there rather quickly.
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Old 05-04-2015, 11:53 AM
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That's one heckuva' boat. Like a fine piece of art!
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