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Glad youโve solved the problem. Now weโre ready to see some in-water photos.๐ BTW, I would also put one drop of blue Locktite on the shaft. Once, I neglected to do that & lost a R.H. prop while backing down even though the prop was tightly screwed to the shaft. Duhh!
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To me that is a system designed to fail; a prop screwed onto the drive shaft on one end & screwed into a fixed object ( the rudder post) on the other. As an experiment I suggest you remove the shaft to rudder post fitting and run the motor to see if the shaft screws farther into the prop & binds the motor. All on the bench of course. Results should give clue(s) about next steps.
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Again, to more or less echo what Chris suggested, take the prop off the shaft. Try disconnecting the shaft from the motor, remove the motor, slide the shaft forward to remove it. Take photos, before & after. The suggestions will be more meaningful & you will get a complete view of what you are faced with.
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If you would care to enlarge the photo will find a grub-screw through the prop and into the prop shaft, as well as the vice jaw marks on the rudder brass sheet. Regards. Gary.
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Having just given you my opinion on your prop shaft problem I thought I should back it up with the following photo, it might not look very pretty but it will be both effective and manoeuvrable, hopefully and as it turns to ninety degrees it will act as a brake. Regards. Gary.
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My humble opinion on this propeller problem is, the prop is to large for the recess it is housed in. one doesn't normally fit a prop which leaves hardly any clearance room. Also, I should like to add that the rudder looks nice but is far to small to be affective and responsive, especially considering the oversized propeller. For the record I have been designing and building model boats for the last FIFTY years.
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The other thing is you could try is to loosen the shaft where it goes into the motor connector (some photos inside the hull would be useful) and then screw the shaft into the prop until the prop comes up against the plain/unthreaded part of the shaft which will stop the prop tightening any further when driving the boat. This assumes that the threaded section of the shaft isn't far ahead of the prop though as otherwise you may not have enough leeway at the motor end.
Failing that you are going to have to take the prop shaft out to see exactly what the situation is and which other option would be best.
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Scratch building 7 Faireys at a scale of 1:12
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