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motors

2008-05-29; 08:30:14 EDT

Member Since

2002-09-17

Posts: 4946

Tom,
Keep in mind that all sailboats have a "design speed" built into them. I  
sail on an inland lake and never crack the throttle on my Tohatsu 8hp motor more  
than 2/3rds. That's where I reach the design speed and it's also the most  
efficient speed for the motor. My manual says it burns one gallon an hour at  
full throttle. If I can travel six miles an hour, my six gallon tank gives me  
(in theory) a motoring distance of about 36 miles. 
 
Rummy
 
 
In a message dated 5/29/2008 6:36:32 A.M. Eastern Daylight Time,  
tjhogarty at gmail.com writes:


Mary  Lou,
Thanks, I will keep the ease of flushing the motor in mind when I  buy.  Was
your old 8 a 4 stroke?  Was it high thrust?  If  the 9.9 and the 8 have the
same weight, why not buy the most  powerful?  Is part of the answer related
to inefficiency at low rpm,  ie., if a stronger engine will get to hull speed
at lower rpm, will long  runs at low rpm harm the engine?  In my landlubber's
imagination, I  think a big motor will save my ass some day.  As I get used
to  sailing, I am learning that sailing is probalbly safer than motoring, but
I  do want the ability to cruise long distances, maybe 20-30  windless  miles
with a reliable motor.
Thanks,
Tom Hogarty, boat still on  trailer


Mary Lou Troy-2 wrote:
See the original archive post
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