Triple Screw Boat

Hi there,

Not wanting to burst your bubble or rain on your parade as they say - but - as you may already know the shape of the hull you are using does not lend itself to be driven at any great speed. But, judging by the propellers and the motors combination you are using, along with the voltage will subsequently make for a bad model to handle at any speed further than the hulls design speed. Hey ho though, it is your model - and that is what modelling is all about - enjoyment. Sail in a shallow lake though, where waders are available

Years ago, when Electronize was in full swing, they used to produce a speed controller which was very basic and you could, literally, switch the signal on and off at any throttle settings and it would not affect the setup of the speed controller. I used this in several models - one of mine being the RAF Crash Tender, where I used an ACTion mixer to control 2 Electronize speed controllers on the outboard motors and the centre motor could be switched on and off independently so I could tootle round the lake running 2 props and when I wanted it to take off like a NASA rocket I switched the 3rd motor in like reheat. Sadly, though, I do not think there are any speed controllers now on the market which allow you to tamper with the signal, Unless of course you can get hold of Electronize speed controllers.

Couple of pics of the internals of the RAF Crash tender.

John

Edited By John W E on 15/07/2022 10:41:16

Mine is just an observation and in no way a critisism but, in real practice the centre shaft would not protrude as much as yours does for very sound engineering reasons. In your model the engineering concerns are not relevant however it does leave you with an arrangement that, to me, just looks a little odd. Extending the keel to come up to the rear of the propeller would be way too much work so it would be interesting to see what it would look like if you simply pushed the centre propeller back a little to reduce the amount of exposed unsupported shaft.

You may well then think that it looks odd not having the props in line but, as I said I simply see it from an engineering perspective.

Go for it Q. It’s your boat, and I rather like the row of props!

I don’t think it will be so fast as to be dangerous on the water, but you may want to ramp up the speed slowly and keep the weight low, and superstructure light.

Ashley

Finally getting to work on the frames...

Getting there Q!

Motr control may be your next issue, three 800’s will not draw excessive current so likely a 30A esc will do, but I would put the hull in the water and try one motor straight across a battery and use a meter to see how much current is being drawn so that you can gauge the total current draw first.

Ashley

Edited By ashley needham on 28/03/2023 09:00:04

Cabin being built.

Q. Nice shape on the cabin.

The very large warship behind....pictures and info please?. In fact some shots of the others would be nice!

Ashley

Thanks, Ashley. For information on the boats in the background, see here: http://www.homeportmodels.com

Can you explain the engineering reasons for your suggestion? I'm curious.