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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Thursday, April 02, 2009

Marathon

So I welcome you dear blog readers, to take a moment and think about the process you have to go through to do your household laundry.... We had been away from facilities for a while, and had accumulated 13 days worth of laundry for 7-8 people. Although we are conservative with our clothing, as you can see, this can amount to an enormous amount of laundry. Aside from the fact that the dinghy was plum full, we had a 4 mile round trip dinghy ride (1 hour + fuel), 2 one way cab trips, a brisk walk to the store for laundry supplies, the cost of washing in Marathon (more than anywhere I have been yet), and the labor involved for all the above. Thankfully I had the help of my mom, but in the end was out about $100! I can assure you though, that the boat smelled way better when I returned :-)



On Febuary 9th, I went up to Miami to provision the ship for leaving the country. Terrie and Robbie from Wahine came down from Labelle for one last visit, and to take me up there for all this crazy shopping. I had been compiling the list for weeks to insure that we would have everything thing we could possibly need at least through the Bahamas. Of course, we have needed to restock on perishables and meat. About 1/4 of what is here is non-food items that become next to impossible or too expensive to replace in the islands.



We filled not only the whole back of the truck under the cover, but also the back seat of the crew cab! Gina and Bobby came down to the dock we were parked at to offload the provisions. It took me a "few" days to repackage andcreativly store everything safely in the boat.



While we were waiting for parts and weather we had a great time in Marathon. It was great to spend some quality time with old friends and have the time to make some great new ones. Gina and Bretton above, taking a break from dancing.



Paulo Suave to you, my dear :-)



Gina girl helming Free Spirit to Sombrero Key, a snorkeling spot a couple hours sail from Marathon (Boot Key Harbor).



Our new and wonderful friend Erin, introduced to us through Bretton. Hey girl, you are welcome aboard for a visit with us anytime!



Bobby, Gina's new boyfriend, contemplating the confusion of the Gaff Rigged Schooner :-)



~Teamwork and Friendship~



Bobby and Gina enjoying the sail home....



Gina's friend Jackie and Mom, full of smiles and sunshine.



Drake, taking his job of helming VERY seriously!



Bretton, Erin and the boys really enjoying the Ripley's Beleive It Or Not book of wierdness :-)



My young man is growing up sooooo very fast!



Sunset just before the bridge to enter Boot Key.





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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 =