[PUP] 103.00 oil solution

[Kevin Kearney]

Many of us trawler types come from sailboating, and the look of sticks on boats is pleasent to the eye. Fun to play with, things to climb about on, a source of stability and a reassurance when the iron sail fails, All good,
   
  However, windage will always be with you and have an influence in your speed, fuel consumption and have a hull reactive behavior to waves and wakes, more bob and yaw.
   
  Ask any sailboater that took their mast off about speed and stability with and without.
   
  Also, relative to that Deere engine, the torque peak and the best fuel use numbers are very close to one another in terms of RPM, with the non turbo 4045 that I am presently installing in my 43 lwl boat 1200-1400rpm yield .5-.75gph 220ft pounds of torque, At 2200rpm the numbers are more like 4gph and 180ft pounds.
   
  Anyhow, a close matching of propeller size and gear reduction to hull speed and RPM at best torque and fuel use for your engine is critical--if you have doubts about diesel operation at low speeds then the inclusion of and Exhaust Gas Temperture pyrometer will help you. For the 4045D good operating temps are 900-1000F and max substained is 1150Fish-more than that means overpropped, to much junk on your bottom or to much windage.
   
  A large prop turning slowly is the most efficient, keep prop size within 10% clearance of your appature, and tip speed below 60mph for props over 30 inches. 
   
  Wishig you following seas and pleasent winds. Kevin

Robert STRAGHAN <rstraghan at hotmail.com> wrote:
  My solution to the price of fuel is to mount a motorsailer rig on my new
Diesel Duck 462. I am the first Duck motorsailer built by Seahorse and should
take delivery in 2 months. I suspect that the operating paradigm will be to
keep the 135 Hp Deere ticking over at max torque/economy, and use the sails
for both stabalisation and propulsion.

When I was first thinking about this almost 2 years ago, the consensus from
TWL was that fuel is a small component of the overall cost, and don't bother
spending money on the rig. Granted wind is not free, however time will tell
if the rig was a wise decision. I suspect so.

Robert Straghan
Diesel Duck 462 - Belle
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