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, December 13, 2006

The Quickening

Welcome, Gentlereader, and come in. My apologies for my brief absence – my humble scrawl is at the mercy of the tides of creative flow. For those not yet aware, my writing is in plain font, while Laura’s is in italics. She has been diligently keeping the blog up during my creative hiatus – thank you Laura.

Foolish is the man who entrusts that which he cannot afford to lose to the roll of the bones, but poor is the man who ventures nothing. The wise man knows exactly how much to leave to chance, so this is my study.

Soon we will begin the final stage of the refit, and there is much to be done. The tasks ahead fall generally into three categories: those which I know are required, those that I know that I do not know of, and those which are entirely unanticipated. That which can be anticipated can be accommodated easily, but as in most worthwhile endeavors, there is also the element of pure chance.

Where chance is unavoidable or desirable, one can only parry faith, so faith it is. In these cases, it of great value to have basis and fortification for your faith. Basis in your preparations, mental and physical, and fortification from your Spirit. Without basis and fortification, faith is only a wish, the fates as fickle as the toss of the die.

The Time is drawing near. I am now endlessly preoccupied with the coming months, and can bear the burden of the present only with measured difficulty. My mind swims with the preparations, repairs, arrangements, logistics, and the nagging doubts that haunt the minds of those who bear responsibility for great undertakings.

My vision precedes my steps, and I exist mostly in the time to come. My body yearns to be reconciled with my sight in the tasks ahead; my hands ache to grasp the tools with which I will chip away at the domain of fortuna, plowing chance asunder where the stones allow the planting of favorable crops.

These anxious thoughts bring me to ponder their roots. It is the domain of life to be an organizing force in a world of essential entropy. It is from the chaos that our power is drawn, focused by all life forms to create and maintain order. Without entropy, there can be no life, no energy, yet entropy itself is the nemesis of all life, forever bound in a circle of order and chaos, the Ouroboros. (Or-O-bOr-Os) More depth into this subject here on the Bogon Flux blog



.....back to the here and now......


We are in Cleveland, Ohio. We have stored our rolling home in Knoxville,TN, and are being generously hosted by Laura's Aunt Pat and Uncle John. We are grateful for their warm hospitality, and for the ease at which they put us - it is often difficult to be a houseguest, especially with a family, but we feel no such stress here. More gracious hosts I cannot imagine - we feel truly at home. Soon we depart for Columbus, southward to recover our little hut on wheels, then southeast towards Free Spirit. We may stop and see my nephew Trygg if the opportunity presents itself.

Our love goes out to all those friends, family, and supporters out there who we will miss this holiday season, may you have much joy and be surrounded by good friends and loved ones.

Fare thee well, gentlereader.

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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 =