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, March 30, 2006

Ghost Ship gets painted!

On the way up from Ft. Lauderdale last year, it was convenient (if amusing) that most boats gave us a very wide berth while in the waterways, some nearly to the point of running aground. Covered with peeling paint and rust, performing her best "floating ship of doom" imitation, Free Spirit scattered the faint of heart. Somehow our desheveled appearance, along with my 9 year old son giving his presidential wave from atop the cabin trunk gave some the impression that a collision with a lesser vessel was not likely to be of the slightest concern to us:

......With a satisfying crunch, the rusty hulk split our polished fiberglass hull cleanly in two. The death groans of our lost craft could just be heard over the rust chips falling into the water. "just a minute!" called a voice from the other end of the ship. The inflection in the voice gave the impression of minor inconvenience, as if we had just asked for a glass of orange juice. Several minutes later, a balding man with a fresh cup of tea looked down upon us from the foredeck. "thanks, chap - I reckon that'll save me a few on the sandblasting! Care for a tea?" Overcome with incredulity, words failed us completely. "very well then, just clear off to port, we'll be out of your way in a flash, and you can swim over to those pilings".....

Our port of destination was Glades Boat storage, just southwest of lake Okeechobee. Free Spirit was sorely in need of painting, and looked for all the world like a derelict snatched from Neptunes salty grasp. Her paint system had failed due to improper surface prep or incompatible paint, and though only seven years old and completely sound, she was, by a substantial margin, the worst looking boat in the yard. To her credit, although she was in a sad cosmetic condition Free Spirit still looked salty and capable - sort of a ghostship chic - but that she was an eyesore by any measure could not be disputed by a sane man.

We had her hauled to the sandblasting pit, which was at the apex of the right hand turn to go to the entrance of the yard. It so dominated the entrance to the yard that the following passage was added to the driving directions on the informational brochure:

"Driving to the yard after securing the final turn, the rusty ship looms ever larger on the horizon, as the distance separating you from the hulk collapses into a mere wish. At the last possible second, in the very shadow of the ghastly apparition, the road darts to the right, providing a quick, if narrow, escape. "

When we talked to the kind folk undergoing preparations of their own, the question of which ship we were from would inevitably arise. "Oh, ... It's so ......... .......... ........ Big! " It was altogether too kind of them to conceal their true thoughts, which could only have been "rusty....rusty.... must... not.... say.... RUSTY HULK!"

Her transformation could only be described as astounding.

2 Comments:

Blogger SV Free Spirit said...

Yep..... She's a beauty :-)

2:38 AM  
Blogger SV Free Spirit said...

I like the revised version much more..

3:31 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 =