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[cos918]

Hi All
I was wondering if any know of an alternative to the Graupner 720 BB torque motor .
many thanks
john 

[inertia]

John
It's not ball-raced but this is pretty close ref performance  http://www.componentshop.co.uk/775-dc-motor.html
DM

[cos918]

Thank you very much that will do very nicely .


john

[Stavros]

Or even the MFA 800 motor
 
Dave

[John W E]

hi ya cos918

I was thinking of the MFA Torpedo 800 Marine motor as an alternative then I saw the price haha here's a link to it
http://www.cornwallmodelboats.co.uk/acatalog/mfa1114_1.html
aye
john

[inertia]

The 800 is a size bigger than the 775. It also has only three poles so is a lot "noisier" electrically. The 775 has five poles and is a very quiet, smooth and powerful piece of kit.
On the other hand I'm pretty sure I have a new Speed 720BB Torque in my workshop somewhere; if anyone would care to make me a sensible offer? 
DM

[Time Bandit]

But the 775 is not an exact alternative to the 720 BB.

720BB was below 3000 rpm under load and could easily turn a 70-80 mm brass prop.
The 775 will go up in smoke with such a prop in a heavy boat.

Ebay will probably provide a much closer alternative than this one if you look for a while.
http://www.ebay.de/itm/230914467279?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649

ebay UK - http://www.ebay.co.uk/itm/5mm-Knurled-Shaft-2300RPM-DC-12V-Magnetic-Electric-Motor-FOR-DIY-Toys-/290913422558?pt=LH_DefaultDomain_3&hash=item43bbca8cde

If you want quality try out Buehler motors. industrial standard 12 pole 
http://www.hobby-lobby-modellbau.com/onlineshop/product_info.php/info/p3804_B-hler-499-BB-HQ--Langsaml-ufer-12-Volt----2170.html
Just a german shop, but youŽll probabaly find some in the UK as well

[cos918]

Hi All
thanks for the input,very much appreciated .
A friend of mine is looking at building a boat .
 I have used a 720 on 50mm prop and was very pleased with it so that why i was looking at the 720 motor .


john