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bob.verwey(at)gmail.com
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 Posted: Mon Feb 28, 2022 10:03 pm Post subject: WAS: Sizing a B-lead ANL now "master fuse" on the battery bo |
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Sort of related query.
A J3 Cub is being converted to accommodate an 0-200 engine with electric start.
The battery box is behind the baggage compartment, and for the sake of simplicity, there is no master solenoid back there, so there is a hot #4 wire all the way top the firewall.
The only electrical load is the radio and intercom, for which there is a switch and circuit breaker.
I want to add a fuse of some kind at the battery box to prevent a "shower of sparks" welding event if there is an incident which causes the steel bits to cut into the hot battery cable.
What is the likely current draw on a typical lightweight starter for an 0-200, and what is the suggested "fuse " mechanism?
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user9253
Joined: 28 Mar 2008
Posts: 1925
Location: Riley TWP Michigan
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| Posted: Tue Mar 01, 2022 6:48 am Post subject: Re: WAS: Sizing a B-lead ANL now |
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No fuse or fuselink of any type should be installed in the starter motor circuit because
fuses have resistance which will drop voltage and limit current to the starter motor.
Simplicity is a worthwhile goal. However, safety is more important. In the
event of smoke in the cockpit or an imminent forced landing, the pilot should
have the ability to shut off all electrical power at the source (battery).
Install a battery contactor.
Imagine this: The pilot makes a pretty good landing after the engine quits.
But gasoline is leaking and wires are arcing and sparking. The pilot is unable
to exit the aircraft for some reason. He wishes that he could shut off the electricity.
Install a battery contactor.
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