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.....

Web sailfreespirit.blogspot.com
If you are joining us for the first time, click here for an introduction!
Books and more, at the Schooner Free Spirit Chandelry
Clothes and more, at the Free Spirit Logo Shop!

Monday, January 22, 2007

Yesterday.... All our troubles seemed so far away....

Well, as I mentioned in an earlier post... Sunday's have become and will remain indefinitely as our official day of rest. It is easy to forget that your brain really needs down time to be creative and to recharge. Tamer enjoyed a dingy sailing lesson with Valin & Drake, I enjoyed a good read and cat nap, Blayde was loving the creative, quiet time to experiment with the precious metal clay that he got for his birthday, Valin went crazy with his waxmation and Drake practiced his reading. We ended the restful, peaceful day with the weekly Potluck up at the Office. Of course, we were "really busy" gaining knowledge from our new friends Olivier & Natalie the owners of Petit Lois.... (More on them later) While we were enjoying our cup of wonderful coffee on board with them, the time sort of slipped away, and I ended up having our food ready an hour late for the Potluck. No worries Mon', the party went on til after midnight :-)

So, during our refreshing time on Petit Lois, the boys decided that they were going to each set up a booth to sell their wares at the potluck. (I am sorry that we forgot to get a picture :-( )The previous week, there had been a gentlemen selling garments from around the Guatemala region, who inspired them. They each had some shells, jewelry, and Drake was even selling fishing gear... Our dear friend Rose had sold each of them some sterling silver pieces for dirt cheap, for them to sell along the way to add funds to their sailing kitties. By the end of the night, they became very confident in their venture, each had their own shtick, and made about $20.00 each!! I am soooo proud of them for their entrepreneurial spirit.

~It's five o'clock somewhere~

Tim, the owner of a beautiful Catamaran that is also in the working boat yard, has a business doing karaoke at various engagements in the area. He decided to set up for the Potluck to add some excitement to the party. Little did he know that the Free Spirit Boys, were professionals at Weird Al Yancovich Karaoke.... WHAT FUN they had!! It was a blast, and they had the audience in stitches. I can't believe how much nerve they had, to get up in front of everyone and perform. I am humbled as well by the amount of compliments that we got on them in general. They have made themselves an accepted part of the boat yard community, and earned the respect of all. We are prouder of them than you can imagine.....


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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 =