Mabuchi no longer list details of your motor
and as it is from an ex flyer chances are it has been cooked at some time in its life.
I agree it is not easy to check for shorts but a reasonable meter will show any major problems.
Pitch is often marked on the props near the boss but an explanation I have seen on the web:
Pitch: theoretical distance the prop travels on each rotation
. This is theoretical because water is not a solid medium and the prop slips. 10 to 30% is normal, the lower numbers are found only on hi-performance props, specially prepared.
Constant Pitch: the pitch is the same across the entire propeller
's working surface, or blade face.
Progressive Pitch: the pitch is lower at the leading edge and increases progressively along the trailing edge.
Consider a prop that runs in a liquid media with a constant pitch, the tip of the prop rotates faster than the hub. Conversely, if the angle at the tip is lower, the water speed on all prop surfaces will be the same. in this case, the performance is far better. Progressive pitch props offer better planning performance.
So if you were to get some graph paper or paper with 1mm markings and set the prop on a shaft over the paper and measure the start point then rotate thro 360deg and measure the finish point this will give you the theoretical pitch.
Over the years I have amassed a fair number of props and usually try various before I decide on the best for the model
Try what you have with the 6v battery
(looks just right for the model
) and see how it sails
From experience I know that this type of model
is difficult to get going and all our club model
s have coarse pitch brass prop
s. Speed will depend on the motor
but with a geared motor
you should be able to reduce the revs to give scale speed.
I look forward to hearing how you progress in a couple of weeks.