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Old Apr 11, 2012, 06:36 AM
Supersonic Engineering
GordonTarling's Avatar
UK, Greater London, Uxbridge
Joined Mar 2001
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Here's the video. I have to say that Bruce looks VERY realistic - well done!
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Old Apr 11, 2012, 09:37 AM
Registered User
Stockholm
Joined Jan 2010
70 Posts
Hi Rick, in my future projekt i have been thinking about using an electrical
windscreen-wiper engine.
You can by them on the junk-yard.
Then you get an arm that is going back and forward+good torque.
This is of course if you have the space and 12V to feed the engine.
Steering by sliding the hole package back and forward.

Just my thoughts about the teknology here.
Strong servos must bee around, just a question about what you like to pay.
Maybe hobbyking.com has what you need?

// Mats W
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Old Apr 11, 2012, 05:02 PM
RC sub dude
CaptainNemo12's Avatar
Montreal, Quebec, CANADA
Joined Nov 2004
301 Posts
I believe this is the correct video:

Rc great white shark (1 min 2 sec)


Looking good!

To put up a video, simply copy and paste the youtube URL in your address bar into the message.
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Old Apr 12, 2012, 03:40 AM
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I crash ALOT !'s Avatar
North Narrabeen, NSW, Australia
Joined Feb 2008
87 Posts
Thanks for the video Nemo, yeah Mats I have a wiper motor but I don'y know how to turn it into a servo , I have a guys coming across to help me this weekend with that , see what he can do , The sevro in there at the moment is a Tonegawa-Seiko PS-050 High Torque Servo
[TONEPS050] that cost me $260 and I think it got water in it so I think is @##$$%^ed I want to build a servo with 120 to 150 kg of torque but what still has speed , Don't know if I can get the two , I really want more speed . You can see in the video looks real but thats its top speed. Thanks again for everyones help with the videos and all the support THANKS VERY MUCH !. We need more sharks built so we can get our own section in rcgroups :}
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Old Apr 12, 2012, 10:08 AM
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Stockholm
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But why do you ned to turn it in to a servo?
Cant you just power it with an ESC and let it run?
If you bay a complete unit it schould go back an forward when you put the power on.
The downside is that you cant control where it stops so esy..
Well, you can if you put some thoughts into it actually.
You need to ad some circutbrakers atatched to the arm maybe?
Keep us uppdated.

// Mats W
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Old Apr 14, 2012, 08:44 PM
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I crash ALOT !'s Avatar
North Narrabeen, NSW, Australia
Joined Feb 2008
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The way I have it set up , if you look on page 1 there is a photo there of the first servos I had , They as well as the big servo I have now is hooked up to the alerion channel on my radio so if you want he tail to go right you move the stick to the right left move it left you have fantasic control over the tail there is no esc just the radio battery and servos I use the servo because it is easy to waterproof with the latex . I can't see any other simple way of doing it .
Cheers
Rick
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Old Apr 15, 2012, 11:24 AM
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Stockholm
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Readymade servos have their bennefit but i think that it might be hard to inkrease the speed.
Ceep upp the god work anyway.
Im folloving your progrees with great interest.
We really need more radiocontrolled swimming kreatures here.
Its strange that theres so litle to find on the net??
Maybe time to start a new thread and ask people to fill in there tips?

// Mats W
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Old May 13, 2012, 02:44 AM
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I crash ALOT !'s Avatar
North Narrabeen, NSW, Australia
Joined Feb 2008
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Just an update on what's going on , I want Bruce to swim quicker I'm making a servo out of a stepper motor {HIGH TORQUE CNC NEMA 23 Stepper Motor 28kg.cm . Guy at the electronics store is going to help {Or should I say make it for me } I should get it back in a month , it should take me a month , so give it two months an check back in then to see if he is swimming quicker , Cheers
Rick,
PS if the guy can do this I'm post how he did it so noone else has this hassle
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Old May 13, 2012, 02:35 PM
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Stockholm
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Hi Rick, lets hope that this makes Bruce kvicker now.
Looking forward to your uppdate.
Here i Stockholm the temperature is just reaching 18-20C.
Summer is cooming :-)
Im thinking about designing a sailboat from scratch.
I have allways wanted that.
Just have to get rid of some airplaneprojekts first.

// Mats W
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Old May 13, 2012, 04:24 PM
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Joined Sep 2004
379 Posts
If you use a geared motor with a wheel on it set so that it would alternately pull one cable than the other similar to the cables used on a motorcycle throttle then you could adjust the speed of the alternating tail movement by simply changing the speed of the motor.

Also a bilge pump set to discharge on the bottom at about pectoral fin distance could also be a simpler way to generate forward thrust while still using the alternating tailfin without reinventing the tail motion.
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Old May 14, 2012, 11:51 AM
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Stockholm
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Somewhere i have an article about a brittish gay (i think), that
put a bilge pump as steering aid.
It was pumping through the geels.
It was a model of an great white chark.

Maybe a hidden propeller in the mouth ??
No, the movement of the fin and the "real" function is important here.
Im sure that Rick will be successfull.
Keep up the god work.

// Mats W
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Old May 15, 2012, 02:54 AM
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I crash ALOT !'s Avatar
North Narrabeen, NSW, Australia
Joined Feb 2008
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Thanks for the suggestions Car' , but I think the tail hooked up to just the throttle would not work for me I would have no control over the direction , if you watch the video the way I turn it is hole the alierion to the right the tail will hold to the right and Bruce heads that way , I can see how I could control the direction as well as I can with a servo motion on the alieron channel , And like Mats said the challenge is to get Bruce swimming just like a shark ,no other propulsion systems , pure tail ! :} Cheers anyway and thanks again
Rick
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Old Jul 21, 2012, 06:27 PM
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North Narrabeen, NSW, Australia
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Ok , just an update, I've been trying to get two different people to make me a servo out of a motor, NOTHING as yet as happened from them , BUT I did find a mob that make what I'm after I think . They are called Device craft ,{ http://www.devicecraft.com/wimoseco.html } in the US I have odered from them a windscreen wiper motor converted to act like a servo that runs through a pot' I shopuld be able to connect that to a sevro with a linkage arm, When I start it I'll put some pics up of the setup, Hope everyone is well ? see ya
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Old Jul 22, 2012, 01:05 PM
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Thanks for the update! I
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Old Oct 31, 2012, 02:31 AM
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North Narrabeen, NSW, Australia
Joined Feb 2008
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Ok , I'm sooooooo close to getting Bruce back in the water , I think I have found the last of my leaks in the WTC I have made in his belly ! If anyone is going to try and build one ,BUILD YOUR WTC BOX FIRST !! build the shark around it , What a hassle:{ Like I said I have the windscreen wiper motor/ servo , thats ready to go, I have made a lid and gasket for the WTC, but I keep getting leaks in it , my trouble is retro fitting the belly into a WTC, I kept taking it down to the lake ,putting it in getting a leak , after the tenth time !!! I ended up hooking up fitting in a hose connection and filling the WTC with water and find the leaks that way, Ill try and put some pics up on what Im talking about, Hope everyone is well :} Cheers
Rick
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