Ultra-Light Kayak Motorization (T500) – Range Backup for the Hobie Kayak

Build Kayaks, SUPs, Surf
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Hi everyone,

I’d like to share my current project: motorizing my Hobie Lynx.

My goal isn’t to build a speed demon, but a reliable and, above all, ultra-light backup system for extended tours (approx. 25–45 km / 15–28 miles).

I usually pedal about 20–25 km per tour, so the motor is intended to handle the return leg or serve as a safety net. My target average speed is around 4–5 km/h (approx. 2.2–2.7 knots).

Focus: Weight vs. Range

Weight was the primary factor in every component choice. I wanted the lightest possible setup without sacrificing the range needed for long days on the water

Technical Setup

* Motor: Blue Robotics T500 Thruster.

C: Matching BlueBoat ESC.

* Control: Blue Robotics Controller Board via potentiometer.

* Battery: HRB 22,000mAh 6S (22.2V) Semi-Solid Battery. I specifically chose this for its excellent energy-to-weight ratio. It’s paired with a smart Daly BMS.

Electronic Components

* Dual-Box System:

I am using two separate enclosures.

Box 1 houses the battery and the BMS.

Box 2 contains the ESC and the Controller Board. This setup isolates the ESC’s heat from the battery cells to ensure better thermal management.

Construction & Mounting

* Custom 3D-printed Polycarbonate (PC) motor mount.

* Mounting Method: The mount will be attached using heavy-duty Velcro (the “screwless license plate” type). It provides an incredibly strong bond while keeping the weight down and allowing for easy removal.

Strategy & Timeline

To maximize the lifespan of the components, I plan to throttle the total power to approx. 80%.

I’m currently waiting for the last few parts for the battery box. Completion is expected in 4–6 weeks, with water testing scheduled for early June.

Questions & Feedback

I am sincerely grateful for any suggestions or improvements! I’m particularly interested in:

* Heat Development: Does anyone have experience with the T500’s operating temperatures during continuous use at 80% load?

* Box Design: Is the internal air volume of a sealed ESC box sufficient as a thermal buffer, or should I integrate additional cooling/heatsinks?

Looking forward to your thoughts and technical advice!

Best regards!

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Hi @JustBob -

Sounds like a fun project! There are quite a few kayaks and SUPs out there powered by Blue Robotics thrusters! In answer to your questions -

  1. T500s at 80% load running continuously in water should be just fine at that higher voltage.
  2. It’s hard to know without knowing the material and size of the box - if aluminum you’d certainly be ok, if sealed and plastic you’ll likely be fine but only testing can really determine!
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