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, May 02, 2008

Yacht Basin To Bunch Beach

Many people do not realize the little differences between living on land and living aboard. So instead of parking your car in your garage/driveway, we tie off the dinghy in wind and waves to board our ship. Generally we have a boarding ladder off of the port (left)side of the boat, but depending on the water conditions it is sometimes easier to board from the aft (back) of the boat.



Drake hanging out in his favorite place on the boat - the rigging.



Nana and Blayde painting with the watercolors.



Our good friend Gina joined us for the day trip from Ft. Myers Yacht Basin to Bunch Beach (near Ft. Myers Beach). She had come in to run me around the day before to provision, and just decided to stay. Looking back with fond memories of this day, I miss the sails that needed sweatshirts :-)



Now, Nana and Drake are doing some painting.



Piloting through the most treacherous area during the trip out of the Caloosahatchee River. It is REALLY narrow, REALLY shallow, and REALLY busy. It has been nicknamed 'The Miserable Mile', and is circled by the Tow Boat US folks. We made it through fine of course, because I have the finest Skipper around!



Looking back on The Miserable Mile.....



Our very first Ocean channel marker!!!!!!



Blayde checking out the swell from the bow sprit. Now we can taste the salt air when we breath, and it is quite refreshing.



Shep had dove below after we anchored to check and see if the prop was fowled, but it was fine.



I am SOOOOOO proud of this young man!!!!!!!!!!




Blayde, who I am also soooooo proud of, motoring the dinghy for us to go explore the shore.



posted by CT | 3:49 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 =