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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Monday, August 13, 2007

St. Augustine July 15th-17th

We finally left the boat yard on Sunday July 15th, with great expectations of a much needed break. Here are the boys enjoying the surf on the beach in St. Augustine that evening. We stayed here for the first 2 nights of our journey, to take a few moments to catch our breath.



The sunset from the East coast of Florida is not near as glorious as from the West, but was still beautiful, especially with Nathalie in the foreground :-) We took the liberty of enjoying our first night off by having a glass of wine, and some fabulous appetizers.



Just an interesting view....



And....... They're off and running!!!!!!!!!!!!!



The boys spent a considerable amount of their "out of the water" time, building forts and burying army guys with sand bombs. I am pretty sure that beach goers will be finding them for years to come :-)

After working in the searing Florida sun for 6 months; and applying sunscreen, I never would have thought..... I had some of the worst sunburn of my life! In between my toes, my entire scalp, the backs of my hands, and the worst was my lower lip. The boys were not as bad, fortunately, but were still peeling in spots for a week. Ya know, I learned something today :-)



Now, this is one excited boy!! Check out the air space between his feet and the beach!!



The lighthouse in St. Augustine was amazing. This is the view from the ground floor, we didn't go to the top during this visit. It was about 90 degrees, we were all sunburned, there were wasps infiltrating the walkway around the top, and it is 219 steps to the top.



Practicing their knot tying skills with Tante (Aunt) Nathalie in the basement of the keepers house.



If you are planning on visiting Free Spirit during her cruising, be sure to study up on these!



Here she is, in all her glory.

posted by CT | 12:24 PM

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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 =