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, June 27, 2007

The Icing

Due to the very unpredictable inclement weather conditions, anything portable now gets painted hanging from the ceiling in the cargo hold. Here, I was painting the 8 - 10 pieces of the inside (water cooled) generator, to prepare them for re-installation. First they got a coat of Amerlock, then a topcoat of Rustolem. I was in heaven painting with the Rustoleum because it is oil based, does not need to be mixed like epoxy, and does not cure while you are using it! The large piece to the right of me is the tray for the generator that Tamer built to fit down into the bilge, to the starboard and right of the engine.

This area is where the old pilot house used to attach to the cabin top. It was blown off during Hurricane Wilma.... Much to our relief because we were going to remove it anyway :-)

One of the things that the installation of the old pilot house taught us, is that you really do not want to mate wood and steel without REALLY good surface preparation. The serious pitting in this area was because they applied the wooden pilot house directly to the steel. Unfortunately the only way to properly prepare the pitted areas is with a while brush on the grinder (as shown). It is a lot more strenuous than a flap disc or standard grinding disc, and spews out little pieces of wire that stick into your skin. Fun, fun, fun :-)

The cockpit, ground and osphoed.... As a reference, this area took about 6 1/2 of straight grinding, then 1/2 hour of Ospho application and sanding block removal the next day. Then it has to be cleaned with zylene and painted with 3 coats of amerlock, which is about 2 -3 hours of work. So, this small area with no difficult surfaces, takes about 9 - 10 hours to finish.

Opposite of the cockpit, I had finished a few days prior....The hatches you see in the lower part of the picture, are the last 2 to be finished!

My plan is to have all of the deck surfaces prepared and waiting for their 3 coats of Rustoleum before we leave in the middle of July. All of the areas will have to be sanded when we return in early October, but hopefully there will be NO grinding!

WOW!! This is what things look like after Laura does her magic. I couldn't ask for a better partner in this project, much less in life. Thank you so much, Laura!

The aft starboard corner of the back deck..... Done! I have been apprehensive about the 110 feet of gunnels, short for gunwales (the area that raises above the deck). There are some very hard to access areas up under the top rail that can only be done with a grinder while you are in yoga like positions.... Anyway, 10 feet done, only 100 to go!!

This is one of the 6 durades (a vent) on the deck of the boat, which are also now ready for Rustoleum.


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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 =