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70mm Diameter, Single Shaft Watertight Cylinder
Coming to you from the UK, these beautiful R&R cylinders feature water pump ballast, installed on/off switch, installed servos and much more. 
 
These units are 70mm diameter (approximately 2.75") with an overall length of 18". The 3.5" ballast tank should be suitable for a vast array of boats. 
 
  • Single shaft output
  • Brushed propulsion motor
  • Pressurized pump style ballast
  • Bellows seals for linkages.
  • Snokel valve for true static diving
  • Polycarbonate Tubing
  • Pressure cast Polyester end caps
  • CNC cut equipment trays
  • Complete with Water Pump, Drive Motor,  Servos and on/off switch preinstalled 

Check out my video review of this product here. 

Required for operation: 
  • Suitable RC radio package
  • Pitch controller (optional)
  • BLM failsafe (optional)
  • Electronic speed controller for proplusion motor
  • Electronic speed controller for ballast system
  • LiPo battery
  • Misc. wire and connectors
 
These units are built to order. Please allow 4 to 6 weeks for delivery.

70mm Diameter, Single Shaft Watertight Cylinder

$420.00 Regular Price
$349.00Sale Price
Out of Stock

  • Provided by the manufacter: 

    The valve needs to be located ABOVE the waterline, it doesn't matter where as long as its above.

    The pump fills the ballast tank up to the horizontal baffle, any over fill simply goes out of the vent.


    To surface, simply reverse the pump. The valve allows a small amount of water to re-enter the ballast tank when surfacing and that leak is important as it allows the pump to work. If there is a perfect seal then you will get a hydraulic lock and this will prevent the pump from emptying the tank.

    As the tank is emptying, a negative pressure is generated within the ballast tank and this will be equalised as soon as the valve breaks surface. The horizontal baffle plate gives a small reserve of air so that the pump can prime and also prevents water surge.

    The battery slot is designed to use the Tamiya buggy style of 7.2v battery (I use 3.3ah NMH)


    I use speed controls for both motor and pump (for simplicity) and the MTronics micro marine Vipers are perfect for the job.
    Keep the red "O" rings well greased (I use PTFE grease) or they can become difficult to pull off (Silicone grease will make the rings swell up)
     

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