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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Sunday, January 21, 2007

Preparations

So now, here we are.....

Hmmmmmm.........

For those of you (Lucinda), who wonder about details :-) We think that we will be good to follow this schedule for our new lifestyle:

Monday - Friday
Mornings - Tamer works, while the kids and I do school
Afternoons - We all work, I run to do expediting if needed
Evenings - Showers, play time
Saturdays - Fort Myers / Ft. Lauderdale / Palm Beach Expediting
Sundays - Our day of rest, and the weekly Potluck at the Office/Showers/Porch area/ Cocktail Hour Place

We are still not sure if we are going to be able to swing a deal to park the trailer here while we work. We are not willing to pay $17/day to park the trailer, along with the $17/day for the boat to be in the working area. Tamer (because he is a genius), has built a web page for the boat yard, and has offered to install them a Wireless Hot Spot, in exchange for a deal on the trailer. We could move onto the boat, but while we are tearing it apart, and doing sandblasting, it would be REALLY nice to have clean beds and clean kitchen.

We made a trip to Ft. Myers (50 miles) yesterday to go to Sam's Club and Home Depot. I am excited that we were able to get the 5 cu. ft. freezer that will be moved into my Galley before we leave. I was like a kid in a candy store in the frozen food section at Sam's Club:-) It is a little difficult to stock up on meat and vegetables with a 5" x 8" freezer.... We will also have a bargaining tool with the plethera of Ice Cubes we can produce!!

All in all, we are very thankful to all be here, healthy and ready to start work. It is a wonderful thing to fall to sleep every night with the feeling that you really did something that day.


posted by CT | 12:58 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 =