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Dec 30, 2019, 08:18 PM
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Got the motor and ESC in and the servo hooked up.. Plumbing is waiting on parts that will be coming in over the next month or so..
With the motor that I have, it looks like anything over 6V on the power will be a bit too much.. But that works out for the type of batteries I'm looking at.. ( 6V Gel Cells)

Superstructure progress is below..
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Dec 30, 2019, 10:19 PM
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Yup, 6v. SLA works well for me. Just the right max speed. Didn't have to use water cooling. Wired in a second SLA to switch in series to provide 12v for my fire monitor pump.
Jan 04, 2020, 07:53 PM
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After some consideration, I decided to go with a brushed 540 motor and ESC instead of the way too hot brushless I had.
Below is the installation of the 540 motor, ESC, and water jacket for the motor..
Jan 05, 2020, 11:29 AM
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I'm not sure if you get lucky with a series 540 motor. For my feeling the motor is too small for a 27 lbs boat with a 60 (2.36') to 70 (2.75'') mm diameter prop.
I measured the prop diameter from the following side view:

A too small motor will draw more current than needed that translates in overheating and water cooling. The battery doesn't last as long as a could with a better adjusted motor.

The tug needs the following rpm under load depending on prop diameter: 2400 rpm (60mm), 2100 rpm (70mm). No load would be about 4000 rpm (60mm), 3500 rpm (70mm). The motor should provide an output of 30+ W. These are ball park numbers to avoid destroying motors or ESCs.

An example for a fitting motor is the Krick MAX Power 900:

Or the MFA Torpedo 800:

Or from Loyalhanna Dockyard motor #HTI:
Or from Loyalhanna Dockyard motor #6372:

I'm sure you can find more motors that are availabe in your part of the world. My Google search provides mostly German results.
Regards, Volker
Jan 05, 2020, 01:01 PM
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More specifically, the motor is a CG 550. specs below

Goldburg 550 Turbo
2528 Rev/volt
85 mOhm internal resistance
2 amps no load current

Should draw about 27 -28 amps on 7 cells .

I'll look at the ones you suggested though..
Jan 05, 2020, 05:09 PM
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Finally got the dinghies built.. that was a lot of fussy work and sanding...
Jan 05, 2020, 11:26 PM
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Hi Kodama. Just as a matter of interest, if you have a Princess Auto in your location, that is where I buy all my brushed motors. There is no indication on them as to whether they are a 550, 650, or 900 but they are a pretty skookum motor for the $. Find them in the surplus motor area. Have never got a dud yet and I have a lot of them. Great tug motors for 6 or 12 v use.

Jan 06, 2020, 10:19 AM
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There is one in town, but I've never been there... Not easily accessible by public transit.. ( no car)
But I'll look into it on the weekend..
Jan 06, 2020, 01:37 PM
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Great information on motors here. I have an Axi 4120/14 here. Was thinking about gearing it. Might be a bit to much though. It's a beast.
Jan 13, 2020, 06:42 PM
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Got a Raboesch 65mm prop installed with a 301-07 propshaft. Nice fit.

Also working on gear for my axi motor. Not sure I will make this work though. Part 5 video is out. Slowly It's becoming a ship.

Jan 15, 2020, 10:55 PM
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And here we are with the railings installed on the superstructure.
I also received the water pumps, and the relays for the receiver to switch them on/off, and to control the lights..
Jan 16, 2020, 12:23 PM
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Nice work Kodama. Where did you get lights and relays?
Jan 16, 2020, 04:27 PM
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Ebay mostly.. For the relay/power controllers.. LED's I'm making from parts or cannibalizing dollar store LED flashlights, etc..
Nav LED's are from an aircraft Nav light kit that I'm re-purposing.

I'll post the Ebay links when I get home..

One of the items:

Another, from Hobbyking:

And the pumps:
Last edited by Kodama; Jan 16, 2020 at 10:48 PM.
Jan 17, 2020, 03:14 PM
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Thanks Kodama
Jan 18, 2020, 12:44 AM
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If I may ask, do you remember where you got the crane and winch for your boat from?

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