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Apr 25, 2019, 10:43 PM
Which way is it blowing?
SF Sloper's Avatar
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Build Log

Jaws RC Shark Dorsal Fin


I've wanted to design an RC shark dorsal fin for some time.
I finally started building one and will share the progress photos here.
First, I had to come up with a design where the components could be easily accessible, removable and water-proof.
These are some early sketches that I did with the idea of keeping all of the components above the water line.
I used 2" thick rigid roofing insulation and a heavy keel that I removed from one of my other boats.
Last edited by SF Sloper; Apr 26, 2019 at 05:41 PM.
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Apr 25, 2019, 11:11 PM
Which way is it blowing?
SF Sloper's Avatar
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For the drive system I toyed with the idea of using one of the Schottel drives from my unfinished Karl tugboat model but rejected the idea as I intend to finish the Karl some day.
Ultimately, I decided to use a flex drive with an outrunner motor I had laying around.
Apr 26, 2019, 12:20 AM
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Hello

Very interesting project. I built mine a few years ago when i had hernia surgery. I originally used 2 550 motors inside pods in a upside-down T formation with a motor on the ends of the T. Then i replaced them with 1100 gph bilge pumps as i wanted to take it in the ocean. The T in made of pvc pipe the whole assembly slides into the fin from the bottom. In the center of the T i have about 3 lbs of lead fishing weights. Check out the video.

Doug's fin (0 min 59 sec)


Shark sighting (2 min 26 sec)


Doug
Last edited by needabiggerboat; Apr 26, 2019 at 12:34 AM.
Apr 26, 2019, 08:54 AM
Which way is it blowing?
SF Sloper's Avatar
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Really nice, I hope mine looks and performs as well!
Great job!
Apr 26, 2019, 04:53 PM
Registered User
I have toyed with this idea for years. My idea would be to use a 2 liter soda bottle for the below water part. And make it an orca fin.

But that's as far as I have gone with it. Maņana maybe.
Apr 26, 2019, 05:02 PM
Which way is it blowing?
SF Sloper's Avatar
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I was looking forward to start shaping the fin.
I Googled lots of shark images to get a general shape by using a rasp and sandpaper.
It was pretty easy to shape but very messy, a shop vac comes in handy.
Apr 26, 2019, 05:07 PM
Which way is it blowing?
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I used lightweight spackle to fill in the voids.
Time to paint.
I'm using flat black and flat white mixed Rustoleum oil based paint.
I cut some notches on the trailing edge, trying to make it as realistic as possible.
I'm going to spackle and sand again, then highlight it with some darker grey.
Last edited by SF Sloper; Apr 26, 2019 at 05:13 PM.
Apr 26, 2019, 06:49 PM
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Looks great!!!!!!!

Doug
Apr 26, 2019, 07:32 PM
Which way is it blowing?
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Quote:
Originally Posted by needabiggerboat
Looks great!!!!!!!

Doug
Thanks! I'm going for the "5 foot rule"!


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