Aeronaut Classic Sports Boat

[Peter Brown 15Participant @peterbrown15]

Hi

I've experimented with different prop sizes and motors for my Aeronaut Classic and finally settled on a 20mm LH brass prop with a 380 brushed motor. The prop looks tiny in comparison with the build but the classic shifts in the water and also there is no heat from the motor even after prolonged running. I had previously fitted a brushless in runner motor on the 2mm shaft with a 30mm prop. The coupling couldn't cope with the revs and I lost the shaft and the propeller. Fun while it lasted.

The current set up can be seen on youtube.

https://www.youtube.com/watch?v=KJpA-MSgCRk

[Peter Brown 15Participant @peterbrown15]

Prop size

[Dave MilbournParticipant @davemilbourn48782]

Peter

Brushless inrunner motors are generally fast-revving with low torque i.e. designed to run through a gearbox. Few model boat props except maybe the surface-piercing type can offer any useful performance with them when driven directly through a coupling and, as you found out, standard model boat couplings are seldom man enough to handle the revs.
From my experience you would have been better advised to opt for an outrunner like the Turnigy one here **LINK** and a 32-35mm 3-blade prop. 20mm is tiny for a model of this size.

Dave M

[Peter Brown 15Participant @peterbrown15]

Hi Dave, it is tiny, however it does propel the boat well without overheating the motor. I do have a spare 25mm brass prop I can try. I agree an out runner is better. Peter

[Peter Brown 15Participant @peterbrown15]

Works well on flat water, struggles on choppy possibly because of the tiny prop.

Edited By Peter Brown 15 on 02/11/2018 11:51:55

[Malcolm FraryParticipant @malcolmfrary95515]

Posted by Peter Brown 15 on 02/11/2018 11:48:34:
Works well on flat water, struggles on choppy possibly because of the tiny prop.

Edited By Peter Brown 15 on 02/11/2018 11:51:55

If the choppiness of the water when it struggles was scaled up to match the boat at full size, you probably wouldn't want to sail in it, at least, not at any speed. Probably more to do with the basic hull design than prop choice, given that in good conditions it runs fast and flat. The waves in the video probably scale up to 1-1½ feet for the boat which appears to be coping just fine.

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