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, February 23, 2009

Trisha & The Beach

Trisha, the closest thing to a daughter that I will have until I have daughter-in-laws, took time out of her vacation with family to visit us on the boat while we were in Labelle. We were all so happt o have a chance to spend some time with her and share our dream. She ended up staying a week, through New Year's and it was wonderful. The day we picked her up, we went to the beach in Venice Beach, Florida. It was great for all of us to get out and have some fun!



Drake, covered in sand after being buried, builds a fort of sorts.



Bretton 'lends a hand' to Valin who is carrying the boogie boards back from the beach.



~Sunset~



A great shot of new friends ~ Bretton and Trisha



Trisha, Valin, Blayde, Drake, Paul and Bretton enjoying an evening game of Cranium on the City dock in Labelle.



Trisha is absolutely terrified of heights, so I challenged her to overcome her fears and get up into the crow's nest via the Bosuns' chair. After many threats and shakes, she made it up the spreader bars, and I was SOOOO proud of her!!



Of course, while Bretton, Blayde and Paul let her down, they had to tease her a little with letting the lines go faster than they needed too... All in good fun!!



Paul and Trisha at the KC Masterpice BBQ cook-off, where we went to watch Robert & Waddie shoot off the cannon. Bet you didn't know that there was a whole culture of people that travel around and do BBQ cook-offs?!?!



Bretton, Trisha, Paul and Blayde enjoying a little photo sharing and UTube in Paul's room.

Thanks for coming to spend time with us Trishawww, I love ya!!

posted by CT | 2:38 AM

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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 =