HMS Norfolk Electrics Page 2


I had a SENIOR MOMENT when installing a Robbe switch module as I had presumed that the input voltage was the same as the one pictured on the left. This was a high powered unit 4.8 to 24 volts. BUT IT WAS NOT. It was only 4.8 to 6 volts and my being a SILLY OLD SOD I put 12 volts through it and that cost me £109.00. OH WHAT A PRATT you would say. But it happens when your mind is trying to do too many things.

Lower supply wiring and 12 volt BECs

The wiring looks in a muddle but it is not.
I used 2 x 6 way high quality stainless steel leaf strip connectors as these would not cut or shred the wires. There are about a hundred metres of wire aboard the model. I have used a spiral wire tidy as this makes it less messy. Forward of the connector strips is an extra plinth holding a 4-way strip connector supplying 12 volt power through a ribbon cable, then onward to the twin heat sinks, each containing two BECs. Also I installed a 4-way strip connector for the 5-volt supply to the forward RX and the aft RX including other modules. The reason I have put in two extra BECs is in case one goes down when attempting a record and I would be extremely MIFFED indeed if that happened! The searchlights that will be installed on the bridge wings and halfway back on the lower wings of the smokestack will be using the normal 12-volt supply. Instead of using grain of wheat bulbs I will be using ultra bright white LEDs and I will be inserting 470-ohm resistors for the LEDs.


Battery Compartment and Wiring


 These then feed the FR15HX-AN Electronize Speed Controllers. These use Power MOSFET`s that are more efficent type of transistors. You can use a supply of 6 to 24 volts and as you know when using 24 volt batteries that are fully charged will give up to 26 volts. These speed controllers survived 24 hours in apalling weather conditions on the River Waveny on 20th & 21st June 2013 enabling us to complete 101 miles.


We originally used two heavy duty German electric motors but we found that they could only rev to 1800 rpm so we bought High Quality British made. These were 24volt DC electric motors and would rev to 4000 rpm and these were made by Parvalux.

Build 22