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, February 22, 2009

Back To Labelle ~ Our Florida Home

The Labelle Flea Market is one of our favorite Saturday pastimes. It was great to share it with our new crew while we were in Labelle outfitting and preparing to leave the country. I know that there are never many pictures of me for the blog, so we have Bretton to thank for this rare, although embarrassing photo :-)



Blayde and Valin finagling over a bunch of radishes.



Our dear and wonderful friends Robert, Terrie & Robbie on SV Wahine were so wonderful to us during our 5 weeks in Labelle. I cannot express our thanks enough for their friendship and kind unselfish nature. They are currently on a 18 month plan to move aboard and cruise their 60 foot steel boat.
Above, the boys and their 8 year old son Robbie went in search of bamboo and scored big. See it being trailed behind the dinghy??



Robbie, using all his strenght to haul it to shore so they can 'build' something out of it. Hmmm... As a matter of fact, I cannot remember what happened to it after the adventure of finding it.... :-)



Robert and his wonderful Father, Waddy built and travel locally with this amazing air powered watermelon(or whatever is handy) cannon. A few years back Waddy was asked and accepted an oppurtunity to act as a consultant on Junkyard Wars. They are very smart, creative and a like minded crew for Tamer. I was shocked at the power of this thing to launch watermelons!!



What a creative name, huh??



Bretton, a gifted photographer, was snapping some great shots atop the ladder when I took this picture.



Bretton, Paul, Blayde, Valin, Drake and Terrie watching a blast off!
P.S. Although this picture would indicate that Paul and Bretton were involved in a serious face off, this was definatly not the case :-)



Well duh?!?! Didn't you know that these roosters are always in the parking lot of the Labelle Post Office??



Paul and Robert, chillin' during Terrie and their son Ronnie's mutual birthday party.



Mother and son cutting the cake...



Our sweet Mom Sherron, saying hello!



Mmmmmm.... That cake was some yummy stuff :-)


posted by CT | 11:55 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 =