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Steam pinnace Janet

Hi Daniel, thanks for these photos and further explanation. The rudder size should not be any problem, it just needs to be adjusted to swing a bit more. On the other hand the motor seems to be very slow, and if that prop has one blade striking the hull it must be replaced or adjusted. That one blade obviously has a different pitch setting and will never function as it should. Good Luck!
Jim
 
Hello All!
I had a little time to try different motors but I had to change a couple
First I serched for a electric brushed motor with gearbox with 900 rpm
This was three times the rpm of my second motor
Sadly in air the screw worked fine but in water had no power at all20250606_210802.jpg20250606_211330.jpg
 
Often with micro or miniature motors it is not the RPM of the motor, but the torque it can produce at RPM that makes a difference.

As you said, it runs in air with no resistance to motion fine, but add water and there is no torque to turn the blade against the pressure of water.
 
Sometimes it is difficult to find a suitable motor for models. The best thing would be if the manufacturer informs the torque with maximum rpm of a certain motor, but that seldom happens. Therefore they almost always give the power in watts together with supply voltage and max. speed, and that gives already enough information to select a motor for your purpose.

When I have to buy a motor for my model, I try to find one with supply voltage 12 V, max. speed about 2000 rpm and power more than 50 watts. When reduced with a gearbox the final speed on propeller shaft should be around 300 to 500 rpm, and then you should have a suitable motor, at least for my models at scales 1/25 to 1/50.
 
Hello Motti
Second motor was beefier than the third but even if the gearbox has same diameter and mounting holes the pinions don't match
The 775 had great torque and is going well
I will do a video with how is going on pond
Also I bought flickering led for adding light in model
Kind regards, Daniel
 
Hello Daniel,
unfortunately your propeller shaft is mounted a bit too high, otherwise a larger propeller could be mounted.

P6070027.JPG

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P6070030.JPG
For lower speeds, I use four-blade propellers with a high pitch, which still ensure good propulsion.
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Kind regards
Thomas
 
Hello Thomas, you are right
This is my first design so I did a lot of mistakes
some were sandable but some were not
The propeller was smaller in my design so to mount a bigger one I put a teflon piece
Daniel
 
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