Two Hulled Impeller Boat RC (experimental)

by wersy, published

Two Hulled Impeller Boat RC (experimental) by wersy Apr 12, 2014
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I wanted to use the full thrust of my impeller. As seen in the video of the impeller boat: http://www.thingiverse.com/thing:274054
the high positioned and heavy motor capsized it already with little throttle.
So I took two long boats and put them together to get something like a two hulled boat. The one is allready puplished: http://www.thingiverse.com/thing:284692
The second one is the enlarged impeller boat.
Both needs a bridge to mount the impeller housing which connects the boats.
Actually it needs only one rudder. This should be on the motor boat with the keel.
Of course two bords also need more power. So you can only make speed if you use a pretty strong motor.
Sometimes you hear a sibilant noise. Then splash water comes into the turbine. And at the end there was also some water in the boat :-)
The big advantage: it will hardly capsize ;-)
And don't miss to close the stern tube. I used M2 srews covered with heat shrink tube. Otherwise you will not only get splash water into the boat...


The best is, if you print the hull with spiral vase methode. Then you will get a neat surface without any noses from layer change.
The hull is 3.0 mm thick.
I printed with layer hight: 0.3 mm and width: 0.6 mm.
Anyway, you have to print it hollow with one perimeter otherwise it will not fit inside the interface part.

The interfaces are supposed to put them fifty-fifty in the gap of each hull part. In this way the the hull parts are aligned and easy to glue.
Before gluing you should mask the edges of the hulls with tape to keep them clean from glue.

Layer hight: 0.3 mm
Width: 0.5 mm
Infill: 0.5
Solid layer: 2 on bottom and top

The hull of the impeller boat became wider after printing it. This is due to the flat floor in the boat that generates tension. Therefore I designed one bridge plus 3 mm.
There are M3 holes to fasten the impeller housing with screws M3x10 mm.
And M2 holes to fasten the bridge to the hull with screws M2x5 mm.
I recommend to put metal strips between the screws and the hull to protect the hull from penetration. For this I used brass strips 6 x 80 x 0.2 mm.

All remaing parts you can take from:
http://www.thingiverse.com/thing:284692 (motor boat enlarged)
http://www.thingiverse.com/thing:272132 (motor boat)
http://www.thingiverse.com/thing:274054 (impeller boat)

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Wirklich ein tolles projekt. Ich würde das gerne für was spezielles verwenden.
Wäre es möglich die CAD Daeien zu bekommen?
Ich arbeite zur Zrit mit Sketchup

Du kannst die STLs in Sketchup bearbeiten.
In Sketchup hat ein Kollege das Speed Boat 3 sogar mit zusätzlichen Schienen am Unterwasserschiff und einen Wellenbrecher auf dem Vordeck versehen.

Can I get the list of supplies for the this project? ASAP Thank You

I wouldn't recommend to build the two hulled boat at once.
The prerequisite is to print the impeller very precise. The impeller must be very good centered and run almost vibration-free. Otherwise it will hit the housing and may break.
Please pay attention to what I wrote about the danger when running my high speed impeller!
To get the boats running somewhat fast, you need a strong motor like the outrunner Roxxy which I used. I have this motor
for my air planes and it is not cheap http://www.robbe.de/roxxy-bl-outrunner-2834-08.htmlhttp://www.robbe.de/roxxy-bl-o...
It has a special hole pattern. If you use a motor with a different hole pattern it will not fit to the housing.
For all this, I would recommend to build the impeller boat first http://www.thingiverse.com/thing:274054http://www.thingiverse.com/thi...
It requires only a little motor. You need these parts for the big one anyway.
In this case the requirement to the impeller must be not so high because it needs less motor speed.
BTW, you don't need to build the motorboat for the two hulled boat project. You can also build the enlarged impeller boat twice.
Going step by step you can see early on whether you want to continue. On this way you will find all needed information.
As you can see in the video, driving the two hulled boat fast will spray water in the impeller and the boats.
Note, this is an experimental :-)

Impeller Boat RC - spiral vase printable
by wersy

thank you we will keep all this in mind when making it.

Hatte schon beim ersten Bootsvideo das Gefühl, die Fahrten finden in Hoechst statt. Nach diesem Video habe ich nun Gewissheit. Viele Grüße an den Jahrhundert-Lake aus Bad Schwalbach.

Und ich hoffe, ich muss in diesen Lake nie reinsteigen - trotz einiger sehr riskanter Manöver mit der nächsten Version: "Tragflächenboot" :-)

would it not be better to shift the impeller a bit more to the rear of the boat. My rc swap-boats have their props about 1/3 to 1/4 of the length of the boat from the rear, not half way the boat. Apart from a little more weight in the rear.

At about 1:15 in the video Wersy shifts the weight a bit more to the back of the boat. :)