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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Wednesday, December 26, 2007

P'tit Louis Floats Again

The crew of P'tit Louis had decided to put up the masts once they were launched and in the slipway. We had to rally up quite a crew to carry them to their temporary spot next to the slipway.



Nathalie and Olivier posing (under duress), while Stefan makes one last trip up the ladder....



Nathalie and Hugo, having a happy moment!



The lift getting positioned and ready!



Nathalie and John, having a last minute talk :-)



From left to right...
Hugo, Olivier, Deana, Raoul, Alan, Stefan and ??, watching all the action from a far.



Valin, Drake and Blayde watching the excitement from the back of Margaret's truck.



The big blank hole that was left after they were gone.... It was really sad for us, and we were a little nervous about who our new neighbor would be. (More on this later)



Olivier looks on while Stefan starts rigging the pulleys on the top of the lift to aid in raising the masts.



Eventually Alan and Olivier join Stefan to finish all the dangerous work!



P'tit Louis in the slipway at sunset.... Beautiful!!



At anchor for the first time, masts successfully raised!!



We were invited to join the crew of P'tit Louis for her first river cruise. We also had Tamer's Mom & Dad, and Gina and her boyfriend Duker along for the ride. It made us really desperate to get Free Spirit in the water along side her.



Tamer happily takes the helm while Mom looks on!


Gina and Duker happy to be aboard!



Valin can almost ALWAYS be found hidden in a corner with a book.... This river cruise gave him the opportunity to get further into his current good read!



Gina lounges and dreams of the day that she too will be floating along side us ~ At least that is what I think she is thinking :-)



posted by CT | 1:23 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 =