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 13, 2008

~ On Our Way To The Big Blue ~

Leaving the dock and new friends in Labelle on our way to the big blue ocean.

Of course, looking back on our departure port we saw the looming squall line quickly approaching, so we set the ship up for rain!

Tamer, motoring ferociously down the river trying to beat the rain. We all ended up getting soaked to the bone!

Approaching our first swing bridge... It was very interesting because the bridge operator had to walk to the midway point of the bridge, and then operate the opening/closure from there. We were also really happy that Terri from Wahini, on her way across the bridge to head home, was stopped by our request to pass. She stood on the shore and waved us through the next bend in the river. What a great surprise!

Me, happily steering through the rain with my bare feet, while Mom prepared a fantastic lunch down below.

Shep, proudly raising the Alaska flag... No pirate flag today folks :-)

I found it utterly amazing that I looked soooooo calm, while Shep and Drake are in the background pretending to maim one another. Being on a boat with all boys eventually numbs you to all of this chaos.

Here we are at the Franklin Lock, tying up for the first time to dolphins. We needed to stay the night here to await the lock opening at 10am the next morning. It was a bit tricky, but each time we have to deal with something new in mild conditions, it makes us that more prepared for doing it in harsh ones. For all these experiences, we are super thankful!

Almost to Fort Myers; and although we had passed the power plant on the highway too many times to remember, the view from the water was way more exciting!

Drake the navigator :-)

This statue is in the river just east of the Fort Myers Yacht Basin. As soon as we passed under the last bridge before there, we had a real porpoise that followed us all the way to the dock. At one point, it looked directly out of the water into my eyes, and I KNEW we were going to have a safe journey.

Nana, sailing peacefully on the back deck.

~An interesting view~

We stopped at the Yacht Basin to get a little fuel, take showers, and do some provisioning. This is just before sunset, headed out to anchor for a couple of nights.

Safely hanging off 2 anchors, at sunset..... Although we are not quite to the Ocean, you can certainly smell the salt from here!


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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 =