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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Tuesday, October 10, 2006

Samoa, but without the Samoans....

Laura took a walk with the boys from our Samoa California campsite. They went to the Pacific coast, and made the children walk barefoot the burrs and brambles to toughen them up, accomplishing much the same goals as outward bound without the spendy fee!!

I'll let her tell her tale on this one!

We awoke our first morning in Samoa, just outside of Eureka, CA to a beautiful sunrise over the mountains of Eureka. The boys and I had heard a rumour that there may be whale sighting or stingrays at the Pacific in the early mornings. So we headed out for the "short" walk to the Ocean... We were on a spit of land that was bordered by the Bay on the East, and the Pacific Ocean on the West. The first event in this comedy of errors story, is that although the Ocean sounded like it was just over the next Dune, sounds can be deceiving :-) We ended up walking for about a mile and a half, over many dunes and through tic infested grasses. (much to Blayde's chagrin) We got to the ocean a little tired, hungry and cold, but the boys still proceded to play in the surf of the ocean. The first lesson at the beach was that you never, ever turn your back on the Ocean (or you will get completely drenched). The second was that when you are tired, hungry, cold and wet, you should probally NOT put your socks and shoes on over sand covered feet.... After much discussion, it was decided that they would walk barefoot for a while, until they dried off a bit, and we found a "grassy" area for them to regroup.

Drake, proving to all of us, that the situation could be dealt with, and even with a smile and positive attitude!!

The infamous "grassy" area... You can see a glimpse of dunes in the background of the kids.. As we were approaching this lovely grassy area, the boys started complaining that the grass was hurting their feet, and my response was to tell them to buck up, and maybe they should not have gotten their feet so cold and wet, blah... blah... blah... I ended up telling them to please just clean themselves up, get their shoes on and sit on their jackets. So, while Valin was cleaning up, he kept telling me that there were burrs poking him through his jacket, and I of course told him to, ya know, buck up ect. ect. .....

Hmmm...... See the "made-up" burrs...... This is after we had already started brushing them off. What you cannot see, is me behind the camera, eating humble pie :-)


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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%


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

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. =
  Prop rpm max =
  Prop rpm cruise =
  Pitch =
  Diameter =
  Static Thrust =
  Cruise HP =
  Cruise HP% =
  SL Ratio =
  DL Ratio =
  SL Max =
  HP Required =