Billing Nordkap Motor

[Tim RoweParticipant @timrowe83142]

Being more of a sailing person I would like some advice on the motor on a Billing Nordkap.  I want it to be quite powerful as I am toying with the idea of trawling a net.   I bought a 2.5:1 geared 450 motor but it seems huge so I may have gone completely over the top.

I am now thinking that a 350 would be better?  By the way, I have no idea what 450 or 350 stands for.

Advice much appreciated.

Tim

[Stephen GarradParticipant @stephengarrad28964]

Have a look at the late Dave Milbourn’s article “But I don’t understand electronics” in the Hints & Tips on the forum. Its very good & gives a table of different motors & their applications at the end.

Stephen

[Tim RoweParticipant @timrowe83142]

Thanks Steven. I will do that.

Tim

[ashley needhamParticipant @ashleyneedham69188]

I would suggest a low Kv brushless would be the “modern” replacement for a geared motor. Something like cheap 28mm outrunner of 1000Kv would power a decent size prop without breaking sweat. Not sure how big a prop we are talking here?

On a 7.2v stick, you would only be talking of 7000 rpm.  One thing a geared unit does get you is good low speed control. I have a big 2 blade 60mm paddle shaped prop on the London powered by a 2.5:1 geared 540 motor and you can get some very low revs on it, barely moving (so you can admire the prop).

Obviously towing a trawl net calls for oomph, and these cheap brushless deliver well over 100 watts normally which is good compared to the output of a “normal ” 540, or even a 600.

Ashley

[Tim RoweParticipant @timrowe83142]

Thank you Ashley.  I will check the prop size.  It is the biggest I could fit in the aperture and probably twice the size of the one in the kit.

Tim

[Tim RoweParticipant @timrowe83142]

Hi Ashley

The motor is an MFA Como Drills 919D Series

It seems to be rated 2,900 rpm at 6v

The prop is four bladed and measure 58mm diameter so probably a 60mm in the brochure.

Tim

[ashley needhamParticipant @ashleyneedham69188]

The 919d series has a 540/1 motor. This a very  low powered 500 can sized unit, however the gearing will up the torque by quite a bit. Obviously running it with 7.2 stick will get you a bit more, and the motor is capable of 12v doubling the speed.
<p style=”text-align: left;”>Depending on the pitch ( and some of these big 4 blade props can be a bit anemic) a 28mm motor might be pushed however on 6v it will likely cope.</p>
If you have a 3s battery then powering the 919 with it would give you enough oomph without any worry.

Ashley

[Tim RoweParticipant @timrowe83142]

Brilliant Ashley

Thanks very much

Once Ray has stopped flooding me with work I will get back to building Nordkap!

Tim

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