Shark fin sled build question

Discussion in 'Replica Props' started by DarkHelmet, Sep 14, 2018.

  1. DarkHelmet

    DarkHelmet Sr Member

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    Would there be an easier and less costly way to make the JAWS fin sled as shown in the pic? It looks to be pretty basic except all the pneumatics. Anything cheaper and more modern that can replace the pneumatics?

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  2. ZeroSum

    ZeroSum Well-Known Member RPF PREMIUM MEMBER

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    So if I'm understanding the picture correctly, the pneumatics are for controlling the rudders? Could a submersible solenoid do the same job? Obviously it would require a source of power, so that would need to be sealed. That's the big issue, really. Pneumatics replace the need to have electrical stuff underwater.
     
  3. 13doctorwho

    13doctorwho Sr Member RPF PREMIUM MEMBER

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    Depending on what you're plan is maybe you don't need the rudders. It's a question of how much fine control you need. That comes down to what you're planning to do.
     
  4. Apollo

    Apollo Legendary Member RPF PREMIUM MEMBER

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    What are you trying to do?

    Put more more WOWIE in Maui?! :lol


     
  5. DarkHelmet

    DarkHelmet Sr Member

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    Thanks gentlemen.

    Apollo, I'm working on a family drama webseries set here in Hawaii. In preproduction but writing quick episode plots for my producer to pitch. We have two pilot episode treatments, one involving a shark. If we can get a sled built, we'd rather go with that as our pilot.
     
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  6. DarkHelmet

    DarkHelmet Sr Member

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    I was thinking an airplane remote control rig since the sled would have the same pitch, roll and yaw axis but would those servos be strong enough in water? Probably why they had to use pneumatics. What say some of you?
     
  7. McFlyte

    McFlyte Member

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    I suppose it depends on the script and shots you need to capture, but do you need the extra control? Could you pull a simpler sled with or from a boat or from shore?
     
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  8. TazMan2000

    TazMan2000 Sr Member

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    I would check out videos on how real sharks look swimming near the surface. The rear fin is used for propulsion and constantly moves from side to side. Contrary to popular belief, sharks do not usually attack on the surface, and prefer to attack from below. If the rear fin is out of the water, their shark's speed and maneuverability is greatly reduced. Check out videos of Universal Studios Jaws ride and see their extremely expensive rigs that look extremely fake compared to how sharks really look in the ocean.

    TazMan2000
     
  9. 13doctorwho

    13doctorwho Sr Member RPF PREMIUM MEMBER

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    I've read some articles on Great White sharks and they don't tend to get that close to land. It's usually a misidentified bull shark. I looked it up after Deep Blue 2. This rig idea seems very expensive.
     
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  10. joberg

    joberg Master Member

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    The rig has to be heavy enough no to "bob" into the water. So you're dealing with quite the heavy support already...regular servos won't do, hence the pneumatic set-up on that blueprint. You could make it as a "one-depth-rig" (without the pitch, yaw and roll). A motor, ballasts & rudders to keep it at a "normal" depth at the surface of the water...or a simple sled (rudders, ballasts and no motor) pulled by cable by a truck on the beach.;) Good luck!
     
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