Hello Roy.
Thank you for your detailed reply 👍.
Very informative.
Never checked the loadings that way but will try it out.
Regards Bill.

Hi I can't identify the motor, but it looks 'interesting'. Deciding on running current / load is more difficult. That is what size of propeller will it drive?

There is a rule of thumb which seems to work fine. You will need a multimeter that reads up to 20 amps.
Apply the battery and put the meter in series and run the motor. Then using a pair of pliers grip the shaft and stop the motor and measure the current. Only stall the motor for the shortest time as it can disturb the magnetic field.

Divide the stall current by 5 i.e. take 20% and this will almost certainly be the most efficient running current for the motor.

If you look at the technical performance graphs of DC motors you can see how this seems to work out. (Often very nice 2nd. hand commercial motors are relatively cheap, and they last forever).
I have used it and motors seem to run cool and perform OK. Most mystery motors have come from a commercial source and as a tip 24volt motors powered by just 6 NiMh cells (7.2 volts) will turn a large propellor relatively slowly and suit a bulk carrier very well.

As a tip you can run an electric motor on just 3 volts from a modern esc which will have a bec for the receiver. Isolate the red wire from the esc and use a 4.8 volt battery directly into the receiver. Wire the 3 volt battery into the esc / motor circuit.

regards
Roy

Gents.
Thank you all for your thoughts on the above thus far.
Des-Eustace your thoughts along with LewZ give me scope for more investigation.👍👍👍
Having taken the gearbox section carefully apart there is a center cog with a three cog planetary reduction gear system inside.
Regards
Bill.

540 size motor case with Krick reduction gearbox --(Bestell-Nr 42129 6:1)

It looks like a 3D printed gear box to me as it looks like ones I have seen in some 3D printer STL files😊

Kind of looks like this:

https://cdn.billiger.com/dynimg/QtzYZJ9BvP9sp-axk5xLqPt4H9rycHjeBa9LTdXG2DAzk8-q

Could possibly be a starter motor off a Jap motorcycle.

Definetely no deca or hectoperms that’s for shure

Gents.
There was a very interesting discussion recently on Motors namely Decaperm and Hectoperm neither of which in all my years I had any knowledge of.

This brings me to the attached photographs.
Can anyone enlighten me as to the name/make type etc of this motor which has lain in my bits box for a while.
I have searched the serial numbers shown but to no avail.
There are no other marks or details on the motor to give any clue as to identity.
I have tested at both 6 and 12 volt and it works well on both.
The black section at one end seems to be a gearbox/reduction type configuration.
Any thoughts would be appreciated.
Regards
Bill.