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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Saturday, November 11, 2006

Surfin' USA... Carlsbad (November 5th - 11th)

OK, so "surfing" might be a bit of an overstatement, as anyone watching me might conclude - but I'm having a lot of fun anyway. Ive been learning the basics, sometimes even getting a little ride now and then. Shannon Van De Vanter is my lovely surfing mentor, thank you Shannon for your tips and the use of your longboard. We would also like to say Thank You so very much for your hospitality during our stay! We had an amazing time :-)



This is fun!



The intrepid surfer, preparing to tame the wild California surf...



Shannon teaches the boys some boogie-board basics.



Sunset with Valin and and I in the surf...




Another beautiful, serene, ocean sunset.... While I sat and watched the onset and conclusion of this sunset, with waves crashing on the beach, I came to the conclusion that I will never tire of this sight!!



California Dreamin'



My first time to the beach with Shannon and the kids turned out to be chilly and cloudy, but there was still a ton of fun to be had. The boys, while exploring inside of these rocks, found an "abandoned" backpack... On a later exploration, in a little different area, they discovered more personal items, even a radio!! By this time, one of Shannon's friends had stopped by, and she politely informed us that a lot of homeless people lived amongst the rocks :-) The boys were really incensed that they could not keep their loot!!



Although it was a cloudy, chilly day, it was a perfect day to get in some kite practice. Shannon really enjoyed the challenge, as well as a by stander who brought to the table a skimming board. This added to the excitement for all!!


ADORATION!!!!

posted by CT | 12:45 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 =