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, May 17, 2009

White Point, Bahamas 3-17/3-19

One day we were able to take a little trek around the uninhabited area of Black point Island with Nathalie and Olivier. These particular flowers are not that amazing, until you consider that they are growing alone out of pure rock face. To me they were very strong to have overcome all the obstacles to come alive!



This is something that I will not even try to explain.... It overwhelms me...
The trash in this very small area was shocking, and it was the worst that we saw in all of the Bahamas. It is obvious that this area is not frequented by the locals!



I will be the first to admit that Tamer had a hard time dealing with the fact that he had run out of French Vanilla creamer for his coffee. This was all I had to offer him in his time of need, so I did :-) In reality, the trash that came into the little harbor here was absolutely disgusting. I was shocked by how much of it must of come from really far away.



Here is looking out over the West side of the Island. This is the beach where we would land and have our campfires. I was unable to fit Free Spirit into this picture, but P'tit Louis is gorgeous in the anchorage.



Some of the scenery from the West side of the island, also the Atlantic side, which is much more aggresive on the terrain than the Bahamas Banks.



The Mushroom :-)



A scenic picture of the Atlantic side.



And yet another, although if you look carefully to the middle of the right side of the picture, you will see Nathalie and Olivier from P'tit Louis.



Sing the tune everybody..... "I'm a model, you know what I mean, I do my little dance on the white rock" :-)



Nathalie in a field of ???? Overlooking that West side of the island.



Free Spirit and P'tit Louis rafted together, with one of their dinghy's headed out to pick up crew for the bon fire... A later post...



posted by CT | 4:20 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 =