Log of SV Free Spirit and ships company

The chronicles of the schooner Free Spirit and her crew, embarking on an open ended journey upon the great rolling heap. Free Spirit is currently pursuing humanitarian and commercial goals in the Dominican Republic, on the island of Hispaniola. Working under the Ocean Reach USA and Paradigm Research banners, she is serving as logistics headquarters, workshop, and development laboratory for many ongoing projects. This is the log of her journey.....

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Sunday, June 21, 2009

Birthday's & Celebrations

I guess that I must have put this one in as a celebration of Squat going where no cat has gone before :-) Olivier is attempting to retrieve her from the back of P'tit Louis.



Often, during celebrations on Free Spirit, guests cannot stop themselves from climbing the mast and getting into the Crow's Nest. Here is a fine example by Michael who was on the boat for a potluck with his wife Cate, from their boat "Renaissance".



Michael did not manage to make it into the Crow's Nest, but did get to the spreader bars by hand. Bretton also took this opportunity to cross between the two masts on the tweenstay to celebrate his 3 months aboard Free Spirit Good job guys!



Matthew, just having a great time as he always does!



Bretton, Michael and Cate enjoying the time to meet and make new friends.



Paul never failed to entertain us with his great musical talent. Fellow cruisers would even ask him where his guitar was when they would visit the boat. Thank you Paul for all the great times!



Nathalie, Connie, Joanne and I all went to shore this day in Little Farmer's Cay. Connie's husband Walt and Joanne's, Georges stayed back on the boats. It was definitely one of my favorite places in the Bahamas. Connie was treated like a princess, as it was her birthday! She got a free drink at the little bar (Maybe 80 sq ft.), and a piece of cake from the proprietor of the Ocean Cabin Restaurant and Bar. Our couple of hours ashore sent us all home happy and laden, with ice, eggs and rum :-)



That night we had a potluck on the 2 boats and celebrated Connie's birthday again. While us ladies were in town, each of the boys made her something special from their treasures. She had tears in her eyes when we all sang Happy Birthday, and said that it was one of the best birthdays ever! One thing that is really special about the cruising community, is that you can meet and spend only a few hours with someone, and establish wonderful friendships.



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Introducing Propcalc 4.0

Use Propcalc to easily match your hull with your engine, transmission, and propeller
Put the known data in the top fields, then hit the Update button to get the answers.
Results, of course, should be verified by a Naval Architect or qualified surveyor.
Data is provided for three bladed propellers of average type
For two or four bladed props, use the modifiers shown below.

Fill out the fields as follows:

Vessel LWL (ft) = Waterline length
Vessel Disp (lbs) = Vessel displacement
(max) HP = Rated Engine Max HP
Engine RPM max = Engine RPM at Max HP
Engine RPM cruise = Desired or estimated cruise rpm
(Cruise or Max) Kts = Speed to work the calculations for
Slip = Propeller efficience. 45% is average for a displacement cruiser.
Gear ratio = 1: Gear ratio of transmission
SL Ratio Adj. = This value will be added (or subtracted, if a negative value) to the calculated S/L ratio.

Key information:

If the "hp required" is greater than the "cruse HP", you have your cruise RPM set too low for your engine parameters.
If the "hp required" is significantly less than the "cruse HP", you have your cruise RPM set too high for your engine parameters.
If the "hp required" is greater than the "Max HP", then your target speed is too high for your engine/hull parameters.
The S/L ratio is calculated automaticaly based on your input. It can be adjusted if necessary, but normally it should be left alone.
If the calculated S/L ratio exceeds S/L MAX, then the results are likely to be non-predictive. Try a lower speed requirement.
SL Ratios of 1.1 - 1.4 are typical of displacement hulls. Semiplaning or planing hulls can go higher.

Typical propeller slip values:

Sailing auxiliary, barges, etc less than 9 Kts............45%
Heavy powerboats, workboats 9 - 15 Kts....................26%
Powerboats, Lightweight Cruisers 15 - 30 Kts..............24%
High speed planing boats 30 - 45 Kts......................20%
V bottom race boats 45 - 90 Kts...........................10%


Note:

it is possible to get irrational answers by irrational input , I.E specifying excessive speed for hull type and length
Any attempt to exceed hull speed (1.34 times the square root of the waterline length in feet) with a displacement hull are likely
to fail unless the hull is extremely fine (multihull) or otherwise exceptional. In such cases, an S/L adjustment would be in order.

2 and 4 bladed props:


For two bladed propellers, multiply the diameter by 1.05, and the pitch by 1.01
For four bladed propellers, multiply the diameter by .94, and the pitch by .98


PROPCALC
  Inputs:
Vessel LWL (ft) =
Vessel Disp (lbs) =
  (max) HP =
  Engine RPM max =
  Engine RPM cruise =
  (Cruise or Max) Kts =
  Slip =
  Gear ratio = 1:
  SL Ratio Adj. =
   
    Solutions:
  Prop rpm max =
  Prop rpm cruise =
  Pitch =
  Diameter =
  Static Thrust =
  Cruise HP =
  Cruise HP% =
  SL Ratio =
  DL Ratio =
  SL Max =
  HP Required =