There is an allowance for brushed motors, but they must have flame suppression screens on the vents. This is similar to brushed alternators used in gasoline powered inboards. Like marine grade alternators, the motors should have a "Marine UL" sticker, orange, not yellow, to signify they've passed testing. Blower motors, electric bilge pumps, even electric fuel pumps most often use brushed motors.
Additional measures can be taken by adding a flammable vapor detection system.
Better yet, change the stove to butane. Butane is lighter than air, and unlike propane, will not collect in the bilge.
Arby Bernt
Advanced Marine Electric Propulsion
From: dan.randolph <danlrandolph@gmail.com>
To: electricboats@yahoogroups.com
Sent: Monday, May 6, 2013 9:07 PM
Subject: [Electric Boats] brushed motors inside boat
So Canada and the US both disallow the use of brushed motors inside a boat if it has a propane stove. Yet several of the well respected, by this list, purveyors of pre-assembled options use: Perm or Lemco (all variations of brushed Lynch motors).
My question: is this (use of brushed motors inside) a serious issue (assuming all the proper propane use precautions, such as turning off gas at tank when not in use, shut off switches in cabin, and sniffers), or is it an example of poor self management leading to regulation that with proper management is not needed.
Brushed motors have significant advantages that obviously lead some towards their use. Yet burning in a boat at sea is not something to be laughed at.
Looking forward to a lively discussion.
- Dan
My question: is this (use of brushed motors inside) a serious issue (assuming all the proper propane use precautions, such as turning off gas at tank when not in use, shut off switches in cabin, and sniffers), or is it an example of poor self management leading to regulation that with proper management is not needed.
Brushed motors have significant advantages that obviously lead some towards their use. Yet burning in a boat at sea is not something to be laughed at.
Looking forward to a lively discussion.
- Dan
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