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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Friday, April 20, 2007

The girls of Glades

In the boatyard, being able and willing to work hard at difficult tasks is a badge of honor among the women. It separates the real "boatyard girls" from the mere passers through or yachties.


Laura,getting ready to grind stanchions. Grinding was very intimidating to her at first, but now she grinds fearlessly with the best.


Laura, painting 'the void"....


...and the focs'l.


Nathalie, exhausted, takes a break from grinding the window openings on P'tit Lois.


and sanding the stern.....


...and the hull....


...and painting the masts.


Julie of Gypsy Otter. She just replaced her engine!!


Deana of Gypsy Queen, Posing for the camera....


... she does a lot of the work on many boats around the yard, and has really finished up Gypsy Queen beautifully. She is soon to be married to Don, also of Gypsy Queen, under the travellift right here in the boatyard! It will be a wonderful celebration.


...showing the latest boatyard colors...


Julie, Nathalie, and Deanna smiling at life....


...as they discuss the latest boatyard fashions and trends. (like how the Norton flap disks are so much better than the ones from Harbor Freight, and how a little linseed oil can spruce up your topcoat, and whether or not cayenne pepper added to bottom paint really improves it or not)


Leona of Jonathon Livingston, being the queen of the boatyard, sips a glass of wine at sunset.


Margaret, of Drummer. Snappy surplus USCG coveralls before....


...And after.



Margaret especially loves to grind coal tar epoxy in the bilges.... or not. Here she ospho's a section of recently ground bilge.


Looking a little disgruntled, but as time would prove, undeterred. Her and Matt have really shown themselves to be a great team, and everyone here has seen them grow closer through the work. In an environment like this, mutual respect is a by-product of the difficult tasks that both partners in a relationship / boat project must overcome.



Margaret removing nuts from Free Spirit's Portholes. This was pre-Drummer, so her boat won't be too jealous.


Kathy, Laura's mother, came to help. She was a godsend for Laura, and helped out a lot on the boat too. Here she works on the skylight that goes on the cargo hatch.

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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 =