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.....

Laura
CT

Wednesday, June 30, 2010

Coming Into Luperon ~ June 2nd, 2009

In the distance here, you can see P'tit Louis's sails heading into Luperon Harbor... We were SOOOOO excited to see green topped mountain's!!

Land Ho!!

~Heading In~

Our first view of "Gringo Hill"... More later....

P'tit Louis waiting for us to enter the Harbor flying what we call their Apostrophe Sail.

The land around the entrance to the Harbor...

More land masses...

Our very first view of all the boats in Luperon Harbor! We were excited to be here for Hurricane Season :-) We never thought that we would have to wait out not only one, but 2 seasons.... Everything happens for a reason!!

Just a lil' birdie welcoming us to Luperon!

Ubuntu, waiting at anchor for us to enter the Harbor :-)

P'tit Louis, doing the same as Ubuntu... Waiting for us... Mind you, we were allowing them to both come in first :-)

Our first sunset in Luperon Harbor!

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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 =