Re: [PSUBS-MAILIST] external Motors for depths of 1000ft

["Captain Nemo" <vulcania@hawaii.rr.com>]

----- Original Message -----
From: "Carsten Standfuß" <MerlinSub@t-online.de>
To: <personal_submersibles@psubs.org>
Sent: Thursday, June 20, 2002 12:39 PM
Subject: Re: [PSUBS-MAILIST] external Motors for depths of 1000ft


 >Motor was filled with lake water (freshwater) - I realise during the dive
that it turns slow - no flash or short securit - still works - I am pretty
shure you lost 20-25 %& efficentcy with a oil filled  thruster.



Carsten,

I'd look for other reasons why you may have experienced a 25% RPM drop.  One
possibility: maybe the brushes were partially "hydroplaning" over the
armature, causing a poor contact: enough to reduce power, but not enough to
stop it from working altogether.   Properly set up, oil-filled Minn Kota's
don't lose much RPM at all.

Pat