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Member postings for SloopJohnB

Here is a list of all the postings SloopJohnB has made in our forums. Click on a thread name to jump to the thread.

Thread: Auxiliary Drive for Pride of Baltimore
25/06/2020 10:20:31

Thanks for your replies, the displacement is a factor of 10 out its should be 13.9 kg.surprise

25/06/2020 01:54:34

Oops, I forgot to add the voltage for the winches is 7.2 volts so it would preferable to use the same battery for the motors.

25/06/2020 01:13:24

Hello guys.

I have been a RC sailor for 20 years racing IOM's, DF65 & 95's but decided to do a scratch build classic boat, the Pride of Baltimore II.

I am in the process of building a 1:24 scale boat, the hull is completed and turned over now working on the inside of the boat. I have 2 sets of drawings for reference, copies of the original Thomas C Gillmer drawings and the 1:64 Shipway drawings.

Boats details:


1157 mm LWL

310 mm BeamWL

120 mm Hull Draft

155 mm Keel Draft

1.39 kg Displacement

1.6 knts scale speed

I have started to build a test rig to sort out the sail sheeting and hoisting, I will be using RMG sail winches, which I have recovered from an earlier build (2003) F100 canting keel 1 meter yacht, 3 x 380HD and 1 x 280D winches and 2 Hitec HS-715BB Sail arm servos......plenty of pulling power.

The next thing is the auxiliary drive, the original boat has twin feathering propellers, so I would like to duplicate that setup, after searching the web I came across the Microcosom viable pitch propellers, I believe that the blades rotate thru 90 degrees (+45 to -45) with some re-engineering I could make them feathering by reattaching the blades at 90 degrees, which will cover forward and reverse if the ESC is unidirectional.

The big questions are, I am not great of electronics having spend my life as a mechanical designer, its great seeing product, water steam coming out the end of a pipe, but you can’t see volts, amps and watts out the end of a piece of wire.

Motors, brushless or brushed motors

What size motors

Single or twin motors, if single a dual output gearbox

Gearbox/belt drives, I have calculated about 2000 rpm propeller shaft speed.

Counter and clockwise propeller rotation

Single or 2 ESC, it looks like a single ESC can drive 2 brushed motors.

Do ESC have forward and reverse, some car units do.


Reading some of the topics on forum they are some great minds, so I am looking forward to the recommendations, Thanks a lot.


Regards SloopJohnB

Edited By John Beavis on 25/06/2020 01:16:12

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