Ralph's Hovercraft on fire at Beale Park
Ralph changed his battery pack from seven to eight cells. It was unknown what current was being drawn from the motor but the addition of just one more cell was too much for the speed controller as can be seen in the following photos.
When selecting a speed controller for your model always consider the increase in voltage you may want to make. Also use the highest current spec controller you can afford. Fran and myself always go for a very high peak, eg 200+amps, and a high continuous current, eg 60+amps. With this spec the controllers only get luke warm when handling 20-30 Amps. For lift control we have found the speed controllers used for electric flight are excellent but have no reverse( not needed on lift).
Be wary of current readings taken when operating a speed controller. This applies to controller input and output. Our experience has shown that the readings are quite lower than actual current taken. Check the current by connecting a battery direct to the motor/prop to be tested. The best way is to use a Whatsmeter (product) or shunt device.
Ralph's model was retrieved without any serious damage except for the speed controller which de-wired itself.
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