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

THE LAUNCH

New Year's Eve and the crew, with new ship's shirts, are ready to do this!!

Tamer, Laura, Valin, Shep, Blayde & Drake Smyth



Tamer and Raoul discussing logistics and last minute details. Now, what was I not supposed to forget to do? (As the travel lift starts up ans heads our direction)



Dearest Shep, It was so great to see such a fulfilling smile on you!



Blayde, as always, calm, collected and ready for anything!



Valin is great at finding things to do while he is waiting out something exciting.



Yep, I am super duper proud to be wearing my new fancy shirt!

P.S. All of the youngest 3 boys, had worked and slaved away while wearing the nice new WHITE t-shirts, and now they are all work shirts :-)




Here is Raoul with popping muscles, attempting to move my special staircase to it's new home at Drummer. I think that we finally ended up using the yard's tractor.




"The Yard Boys".... John, Proctor and James getting prepared to haul us out. (with Hugo trailing)



Here she is, lifted and hanging while the last spots of bottom paint dries before hitting the water.



almost there......................



Olivier, trying to release us from the straps so that we could be floating on our own!



We took up most of the slipway, so it became a group effort to get us pushed out of the mud, off the straps, and free.



Now we know that we are not taking in any water, are off the mud. Time to
get all of our dock lines secured, and stay for a while :-)



Okay, okay so maybe we got a little impatient... We were not in the water for more than a couple of hours, and we HAD to take her out for a spin!!!



Released from the grips of land at last, the good ship Free Spirit is prepared to float in the New Year......



posted by CT | 1:41 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 =