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Old Apr 15, 2011, 08:44 AM
GILL
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United States, NJ, Hopatcong
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Those will work, they run well at 5 volts all the way up to 14 volts. My flat bottom will be running 7.2 or 8.4v.

Hoghappy in researching the flat bottoms I found some that have a shallow step keel in them.


nick_75au so you know where I am coming from I work for Polk/Aristo-craft, I handle the LMP division.(commercial) we are the US reps. for Mabuchi, Nichibo, San-ye, and several other fractional HP motor manufactures.
On average the 5 pole motors have about 5-20% more torque the a 3 pole motor. Motors used in the trains, including ours, Aristo-Craft (G) & RMT (O) are wound for a lower speed and higher torque. These motors are also 0 timed and will run equally will in both directions.
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Old Apr 15, 2011, 02:27 PM
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Hey Gill if you work for Polk, mayhaps you could tell me how to get my hands on a few 00100 speed controllers on this side of the pond...
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Old Apr 15, 2011, 04:06 PM
GILL
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United States, NJ, Hopatcong
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No problem we ship world wide.
Just go to the web site and order the PLK00100.

The more I look at my design, I start to think maybe I should build a full size.
9 ft long. It would fit in my trailer that is 12 ft long. I think that it would make a great recovery boat for the club. Electric trolling motor for power.
I would make the cabin removable.
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Old Apr 15, 2011, 06:55 PM
NeverAgainVolunteerYourse lf
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No matter what you say low current is low torque, the whole low Kv high torque is a myth.

The fact is that spinning a prop at low RPM requires less torque that's why Low Kv motors are brilliant for direct drive applications

http://www.mabuchi-motor.co.jp/cgi-b...ch/e_model.cgi

both 550 3 pole motors have more torque


Nick
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Old Apr 15, 2011, 07:06 PM
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Most of the little tugs shown in this thread look a lot like the 14' mini-tug, the plans for which are advertised in Wooden Boat magazine. Kinda cute---.
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Old Apr 18, 2011, 03:52 AM
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Stuttgart, Germany
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I'm trying to choose a prop now to match to the speed 600, its a 7.2V motor direct drive, and I have room for up to 45mm of prop. Can someone suggest to me a Raboesch brass prop size/blade count that would give moderate speed on 6V from two 4.5Ah sealed lead acid batteries, without burning out my motor? It is water cooled with an aluminum tube coil from graupner.

Thanks in advance..
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Old Apr 18, 2011, 04:25 AM
NeverAgainVolunteerYourse lf
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Which speed 600 the 7.2v ECO or the 7.2v standard

The standard has a KV of 2530, the ECO 1530 so 15180 rpm vs 9180 RPM at 6 volts

The best one is the speed 600 BB Turbo 14.4 with a KV of 1000 for 6000 RPM at 6 volts and 40-45 mm prop, I would put a 25-30 mm prop on the ECO and the smallest I could find on the 7.2 std.

As for blades, whatever takes your fancy, 3 blade D type Raboecsh is what I use for my springers, 3 or 4 blade is not going to have a great deal of difference.

Cheers
Nick
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Old Apr 18, 2011, 06:18 AM
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well crap. I have the 7,2V standard and that doesn't seem like it was a good choice. Looks like I'll be ordering the 600 BB Turbo, its 12V but I think thats the one you mentioned.

http://www.conrad.de/ce/de/product/2...30010&ref=list
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Old Apr 18, 2011, 06:33 AM
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Hey nick,

This isn't a speedboat by the way and the model is 54cm long, isn't that 600BB Turbo for speedboats turning high pitch props? Either way it looks like my 600 standard has too high KV for turning a big prop it would probably drain the battery and overheat pretty quick. Should I go ahead and order this motor?
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Old Apr 18, 2011, 06:39 AM
NeverAgainVolunteerYourse lf
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12v 600 BB turbo is 1450 KV so 8700 RPM at 6 volt only slightly better, maybe they have Speed 500 E 12V same Kv as 14.4 600, with a 35-40 mm prop

This one is much closer to the sweet spot
http://www.conrad.de/ce/de/product/2...30010&ref=list

and the Speed motor

http://www.conrad.de/ce/de/product/2...30010&ref=list
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Old Apr 18, 2011, 06:47 AM
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http://www.conrad.de/ce/de/product/2...30010&ref=list

Will turn a 45 mm prop only on 6 volts might be a little slow,

though it wont be pushing the 4 Kg of a Springer either so might actually be OK
600 BB turbo is really good for speedboats but needs to have more than its rated voltage for good speed, at lower than rated voltage becomes a nice slow motor with enough torque to drive a largish prop.

Nick
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Old Apr 18, 2011, 08:46 AM
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I think I'm going to order this one http://www.conrad.de/ce/de/product/2...30010&ref=list
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Old Apr 19, 2011, 11:52 AM
GILL
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United States, NJ, Hopatcong
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I ran mine on Sunday. 7.2v 1500ma nicad. At full speed with a 30mm 3 blade Raboesch brass prop. Speed is a bit faster then I can walk, duration was 1 1/2 hours +. That's running full for about 70% of the time. Handles very well and will turn on a dime.
Now I just have to finnish painting and detailing her.
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Old Apr 19, 2011, 09:53 PM
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Olympia WA
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Gill RC I'm waiting with baited breath to see some video of how the tug handled on the water. I have been eying these for a few years but have always had to put them on the back burner, maybe this will get me off my duff and build one for the grandson. Jerryj98501
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Old Apr 20, 2011, 06:20 AM
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seems like it took ages but finally I managed to get all the parts cut out and started assembling last night, its looking good but I will really reduce the parts count in my next iteration. It was a chore cutting them all out.
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