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PostPosted: 02 Jun 2013, 17:19 
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Joined: 28 May 2013, 12:47
Posts: 22
Location: Stellenbosch
This is my RC speed boat I built in January this year. The whole boat is made out of model grade ply of various thicknesses. The boat uses a surface piercing propeller which I also made from scratch.


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Starting by obtaining plans from the internet, I used these plans only as a reference, and made a lot of changes to the original design. By boat is a lot shorter than the original design.

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Cutting out all the ribs with a jigsaw.

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Starting to cover the boat with thin ply.

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My new boat alongside my old smaller one, who is getting pretty tired.


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The 14V motor which will power my boat. I scratch built a clear plastic water cooling jacket around it. Water will be forced around the jacket as the boat picks up speed, keeping the motor cool 8)

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Inlet and outlet tubes.

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Fully adjustable trim plates and rudder.


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Speed controller setup.

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Buoyancy added.


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Drive shaft installed. :smt023


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Spray rails added.


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Home made propeller, I used brass plate, Q-bond and some commonsense.


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Paint!!


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My Dad helping me out with the spraying.


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A thing of beauty.


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PostPosted: 02 Jun 2013, 17:35 
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Joined: 28 May 2013, 12:47
Posts: 22
Location: Stellenbosch
:smt023 Video of my boat!! :smt023


http://www.youtube.com/watch?feature=pl ... vfpYX-vjqY


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PostPosted: 03 Jun 2013, 00:03 
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Joined: 01 Apr 2012, 04:49
Posts: 2852
Location: Wellington, New Zealand
You have some seriously good skills mate......tanks, boats! You got an RC aircraft hiding somewhere..? :D


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PostPosted: 03 Jun 2013, 09:02 
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Joined: 07 Apr 2008, 11:50
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Interesting that the rudder is offset outside the propeller's stream, what effect does that have?


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PostPosted: 03 Jun 2013, 09:29 
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Joined: 28 May 2013, 12:47
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Location: Stellenbosch
Dankie vlamgat! :-k My dad is the one who is more into RC aircraft, although I always went to fly with. About 6 years ago my dad received an old, half built large scale RC de Havilland tiger moth kit which was in very poor condition. (the kit was partially built in the 80's and stored, the rats left their mark!) We completed the plane together, and I did some extra detailing in the 2 cockpits. The tiger came out very nice, but it has been a while since she took to the skies. :smt023 Will post some photos later on. :mrgreen:


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PostPosted: 03 Jun 2013, 17:37 
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Joined: 28 May 2013, 12:47
Posts: 22
Location: Stellenbosch
Roger the Dodger wrote:
Interesting that the rudder is offset outside the propeller's stream, what effect does that have?


Yes Roger, it does look rather strange! It is out of the prop turbulence because the boat uses a surface piercing propeller. As you can see in one of my photos, the shaft exits at the bottom of the transom, this means that only about 55-60% of the prop is submerged at high speed. The prop will then naturally cavitate, leaving a mix of high speed water and bubbles in its path. A rudder needs to be fully submerged in "clean" water to work effectively. The offset rudder overcomes this problem, and gives much better handling at all speeds. :smt023


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PostPosted: 03 Jun 2013, 18:53 
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Joined: 03 Apr 2013, 18:00
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Very good work Hein, you have mad skills dude!!!!


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PostPosted: 15 Oct 2013, 21:41 
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Joined: 28 May 2013, 12:47
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Location: Stellenbosch
Thanks Drifter :smt023

Here are some more pictures after I slapped on some paint.

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http://i1067.photobucket.com/albums/u42 ... old059.jpg

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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! VIDEO !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

https://www.youtube.com/watch?v=N1cymf2 ... oVcVTNtA5Q


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