On Aug 24, 2010, at 22:44, redu wrote:
>
> Weird specs!
>
(snip)
> They should say:
>> Cruise 4.0 R thrust is comparable with 9,9 hp gas outboard thrust at
> boat speed of 0 m/s.<
> This is possible, as propeller is better, and el-motor thrust is good
> at low rpm.
This thrust number is referred to as the "Bollard Pull Test" and is
usually applied to tugs. For my cruising boat, I am interested in this
zero-velocity thrust figure (unobtainable from outboard manufacturers)
because I'd like to know against what sort of wind loading (separate
topic) I can still try to make forward progress, or, especially,
maneuver inside a marina when it's blowing.
For my 9.9hp Yamaha Hi-Thrust outboard (the 323cc not the 232cc
version), I measured around 250#. These outboards have significantly
higher thrust than 'conventional' 9.9hp outboards.
http://www.katiekat.net/Cruise/KatieKat2003E.html#050503
Having the static thrust number from Torqeedo (214# for the Cruise
4.0R) allows an apples-to-apples comparison and for me is quite
acceptable if I wish to replace the Yamaha. Wish all outboard
manufacturers did this.
JoeS.
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