Sunday, October 25, 2020

Re: [electricboats] Quest for 2X Hull Speed

It was designed by Jurgen Sass, and this is the first build of his design.

I also picked up a 4 year old Lehr 2.5hp outboard.  I just figured out why it was cheap, the oil fill plug in the lower unit is stripped.  It should not be too difficult to fix.  I removed the engine assembly, and now I am working on a plan to retrofit an electric motor.  Ampflow has some nice brushed DC motors, but the efficiency curve is very narrow at the top.  I am concerned that my operating range may not be optimal.  It seems the BLDC motors are more efficient and the efficient range of operation is much wider.  I found the options to very limited given the 1,000 to 1,500 watt requirement.  Many of the motors do not have detailed performance specifications, and others seem to be very inefficient for that power range.  Perhaps the best option is the 1,500 watt Golden Motor BLDC-108.  If anyone has other ideas/options, I am interested.  I am also concerned that there will be a significant efficiency loss with the 7.25x6 (options up to 7.25x8) propeller, and there is not sufficient clearance below the cavitation plate to increase the diameter.  Increment two might be a custom build of the lower unit with Epropulsion propeller above...

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