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, August 30, 2006

Travel Log.

Saturday, Aug 26 1200 Left Fairbanks, southbound. Drizzle. Made Haines Junction about 2400. Right around a 500 mile day.

August 27 1100 After having our first taste of Canadian coffee, we departed Haines Jct. Raised Laird Hot Springs around 2330. Yet another 500 mile day :-)

August 28 Enjoyed Laird Hot Springs!! Great place. Mixed weather.

August 29 Departed 1400. Reached Dawson Creek and the end of the Alaska Highway, (1,523 miles from Fairbanks) at 0200. Stayed at Mile 0 Campground which offered great laundry and shower facilities. Wow, it would seem that the "500 mile" day is standard.

August 30 Explored Dawson Creek, provisioning and maintainance stop. Mostly sunny, wind from the northwest. Seemed like a charming little town, and the locals were a bit more friendly.

August 31 Departed 1200 under sunny skies. Encountered 15-25kt headwinds, decreasing our fuel mileage to 8.76 MPG, a new low. Raised McDonalds restauraunt, (which offers "free" wireless internet) in Quesnel (quenel) around 2000. Tonight we will stay at a Hotel, get our "free" breakfast downstairs and make a run to Tonasket, Washington (420 miles) early with minimal preparation required. We could all use a "real" berth for a night.


More pics from our travels.....



The yard sale (huge mess) we left behind..... Graciously, my brother Kraig said to leave anything we didn't sell, so we did... Thanks Kraig and crew, much appreciated!


Faint Double rainbow at "the sign place"



Me, at "the sign place". Over 50,000 signs, many stolen from public works departments worldwide. Your tax dollars at work!!!


The Traveling Rig, hour zero.




Wow, how fun!!! Thank goodness for MP3 Players :-)





Arriving in the dark, we woke to this at our first stop in Haines Junction. Breathtaking!

posted by CT | 11:28 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 =