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, June 22, 2009

Georgetown Exumas, Bahamas ~ The Beginning ~ March 19th

Our very first view of Georgetown Harbor... We had spent 3 weeks in the Bahamas at this point and never shared an anchorage with more than about 30 boats, so this was overwhelming! We arrived right after the Georgetown Cruising Regatta, so there were only about half the boats there that had been anchored just the previous week. I was super excited for the boys to have the chance to meet and spend time with other cruising kids!
Most of the boats anchored on the East side, which is on Stocking Island, it is also the same side as The Monument, Hamburger Beach, The Chat N Chill, St Francis Resort & Marina, and Sand Dollar Beach. Georgetown was about a 20 minute Dinghy ride towards the West on the mainland.

Our first sunset, off the stern of the boat, was rejoiced by numerous conch shell calls as the sun dipped behind the horizon. It is a cruisers custom that I was never aware of until our time in here in the Bahamas.

Our first day ashore was also Tamer and I's 24th Anniversary... It was so awesome to celebrate in such a beautiful place :-) After the scheduled 'adults' volleyball at 2pm, all the kids gather to play their own no holds barred games.

The boys were just happy to be hanging out and playing ashore with new friends.

Drake, enjoying the tree swing...

And being as high up as I would allow him to go in the tallest tree around! "But Mom, the view is so cool from up here, and I will be fine." :-)

Paul, Matthew and Bretton having some fun of their own with Andei, further down the beach in front of Chat & Chill.

The intense color of the water here never ceased to amaze me! My amazing Captain and I escaped for a little date for our first trip to Georgetown proper.

Birdies resting at the Dinghy dock at Exuma Markets.


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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%


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

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. =
  Prop rpm max =
  Prop rpm cruise =
  Pitch =
  Diameter =
  Static Thrust =
  Cruise HP =
  Cruise HP% =
  SL Ratio =
  DL Ratio =
  SL Max =
  HP Required =