The motor smoked the first time I ran the boat:

- Boat: Billing Boats, White Star (length 54cm), www.cornwallmodelboats.co.uk/acatalog/billing_boats_white_star.html

- Battery: LRP Hyper Pack 4000 – 7.2V, www.lrp.cc/en/products/vtec-batteries/stick-packs-6-cells/produkt/lrp-hyper-pack-4000-72v-6-zellen-nimh-stickpack/details/

- Motor: Graupner Speed 400 6V (3321), www.cornwallmodelboats.co.uk/acatalog/graupner_3321.html

Battery is connected to the motor through a plain on/off switch (full speed all time, no speed control, no rc). I control the rudder with a rc taken from a cheap rc car.

What is a suitable solution to the problem?

Thanks,
Anders

Does your hull use a prop? What size in diameter?

The problem is you are asking a lot from that motor to attain the speeds you are getting from it. It simply does not have the mass to dissipate the waste heat produced. A larger motor with slower RPM's would be better suited.

I would also recommend picking up an ESC for you receiver to power the motor. This will result in greater efficiency and control.

Ryan

Ryan, thank you for your response! And thanks for all the info you give in the thread "Choosing an Appropriate Fast Electric Setup"!

The hull uses a 3 blade plastic prop, 35mm in diameter.

Could you, or others, recommend a specific motor that will be suitable?

Also, what is recommended, direct drive or a motor with a gear box attached?

I would like to avoid ESC, since I use a simple rc that is taken from the cheapest rc car I could find (approx. 10USD).

Thanks,
Anders

Look in to the 500 or 600 size motors. The 12v version spins at slow RPM's and will use a larger prop. The hull might be a bit slower but will provide reliable power. Direct Drive is preferred.

The information found in this forum is for fast electric boats. You may be mislead if you read the information in this particular forum. If you go back to the main boating forum page and click on scale boats you could get a better answer from those guys as they run boats more similar to yours.

Ryan

Thanks again.

Here is a picture.

Also, there is no room for a larger prop.

/Anders

Love the LEGO

You may want to consider a lower wind in the 500/600 can size. Perhaps the 9.6v version to turn the 35mm prop at a decent rate. You would be better off talking to the scale boaters as I have limit experience with these hulls.

Ryan