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Triple Screw Boat

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Queequeg Quint25/06/2021 23:30:43
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94 forum posts
101 photos

I am attempting to build a triple-screw boat that actually works. Here is the hull design that I'm working with. It's 45-inches long, 14-inches wide.

Hull Design

Here are pics of the hull being built:

Hull being built

Hull being built

016d99a1-2c68-47ea-99c8-6b2498c2afe9.jpeg

I will post pics on this thread as things progress. Of course, I am open to suggestions and constructive (no pun intended)-criticism along the way.

Kev.W26/06/2021 00:09:55
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324 forum posts
38 photos

Nearly finished 1I have a 'triple screw boat' it's approx 1070mm long & 175mm wide, it came with 3 'Jumbo 2000' brushed motors, driving 3, 3 bladed 45mm props.

It was rubbish performance, so swapped the motors out for 3 brushless motors,

Using 3, 3cell lipos these proved to be too much , so removed the centre motor & prop (leaving the shaft in, but sealed), now run it on the 2 outer shafts, contra rotating & it does really well as regards scale speed (thumb control helps) and gives scale speed without rolling in the turns.

The boat in question is an old 'Graupner Weisel'

Edited By Kev.W on 26/06/2021 00:12:28

Paul T26/06/2021 15:50:08
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7334 forum posts
1229 photos
2 articles

I had a lot of fun getting a triple setup in my Red Leader MTB.

In order to maintain a shallow pitch on the prop shafts I had to invert the motors and hang them upside down on a special frame.

To maximise the slow speed steering I fitted over size rudders.

ellie motors.jpg

ellie electronics.jpg

ellie rudders.jpg

Queequeg Quint26/06/2021 16:09:15
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94 forum posts
101 photos
Posted by Paul T on 26/06/2021 15:50:08:

I had a lot of fun getting a triple setup in my Red Leader MTB.

In order to maintain a shallow pitch on the prop shafts I had to invert the motors and hang them upside down on a special frame.

To maximise the slow speed steering I fitted over size rudders.

ellie motors.jpg

 

ellie electronics.jpg

ellie rudders.jpg

Lovely set up. I am inspired! How does it handle in the water? Do you control the motors individually? FYI: My battery-friends have built me a 12-volt NiMH which can handle a 30Amp current and has 8,400mAh. I'm taking this project one-step-at-a-time. I'm still keen on using three MFA 800s, but am going to study the hull in person before I go forward with the motor-decision.

Edited By Queequeg Quint on 26/06/2021 16:09:49

Richard Simpson26/06/2021 16:28:34
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649 forum posts
302 photos

30 amps, that's a domestic ring main! You should have some fun with that.

Paul T26/06/2021 16:28:38
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7334 forum posts
1229 photos
2 articles

I used an Action System that Dave Milbourn built for me,

Combined ESC & Mixer provided different levels of power to each motor to enhance the steering..

It handled like a dream and was quite fast even with 600 size brushed motors, mind you I was pushing 18v through them.

Sadly Dave is no longer with us but his layout designs are here Dave sold Action to the Component Shop link who are very helpful in advising the correct system for your setup.

mtb 1 (small).jpg

Queequeg Quint03/07/2021 18:54:34
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94 forum posts
101 photos

The hull arrived today.

46e4a6ea-461a-445a-8448-f9623c0f22e2.jpeg

Edited By Queequeg Quint on 03/07/2021 18:55:15

Tim Rowe05/07/2021 08:43:45
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570 forum posts
577 photos

Helllo QQ

I wonder if there is any particular reason that you want triple screw?

Your hull moulding is very clearly designed for twin screw and to add a third it looks like you would have to shorten the centreline skeg.

Going for three will add complication for no significant advantage if any. If something more complex is your aim however - go for it!

Tim R

ashley needham05/07/2021 16:09:17
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7323 forum posts
156 photos

Q wants three props. That’s what he wants what he really really wants.

Two just does not hit the spot!

Ashley

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