Two interesting products at at the 2012 Miami Boat Show were the propane-fueled outboards from a company named Lehr Inc., based in Los Angeles. Lehr offers 2.5 hp and 5 hp propane powered engines that voyagers can use on their tenders and dinghys. Lehr makes the point that, environmentally speaking, propane is a superior fuel to gasoline. It costs less, doesn’t spill, reduces particulate emissions and hydrocarbon emissions. Another nice advantage for anyone who who has tried to get an outboard started, these engines have no choke and require no priming.
The Lehr outboards can be run using either a 16.4 oz camping bottle size tank that screws into a fitting on the back of the engine or a five gallon remote tank that connects to engine via a fuel hose. Here's a video of the Lehr engine in action.
http://www.oceannavigator.com/content/cleanest-outboard
Reportedly - the 2.5 hpgets about 1 hour of running time from a 1 lb bottle, and the 5 hp gets about 40 minutes run time.
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