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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Friday, May 02, 2008

Bunch Beach & Beyond

Nana exploring Bunch Beach at sunset.....



I hope to never bore you with pictures of sunsets over the ocean.



The boys, and Terrie's son Robbie, from Wahini played well after dark in the creature filled water.



I had to slip just one more in there :-)



Terrie, Mom and Gina having cocktails on the beach. Terrie had brought Robbie out to play and visit one more time. We ended up seeing them again, but it was really nice to be met on shore by friends!



Amazing sea life was abound on this beach... More so than any other place that we have visited. A local shell collector informed us that Bunch Beach was a protected area and there are something like 100,000 living creatures in every square yard of beach. You are also fined $500 if you remove any living thing from there. We of course, did not take any chances, but held and inspected many things we had never seen before.



Cool snail, huh??



Blasted! How did another one get in here???



Just a lit'l crab...



So, this is what happens when you "think" that you have gone to shore during low tide and you leave the dinghy. Apparently, the tide was going out, because we ended up having to carry it about 20 feet when we left. It's all fun and games, and noone got hurt!



Drakes first time jumping off the rail and into the ocean. All the boys had been waiting for what seemed like an eternity to do this.



Then Blayde....



then there was Valin, who wanted to test the water off of the swim ladder, before jumping in head first. Eventually, they were all swimming away!



Some very odd plant on Fort Myer's Beach.



This Momma was also on Fort Myer's beach, and we enjoyed watching her feed her babies.



1 Comments:

Blogger Gayle said...

I'm so bummed we didn't have a chance to get together when you were here. I would've loved to hear of your adventures, but I guess your blog will have to do. Looks like you're back at the fun...take care, travel safe, and keep posting lots of photos. ~Gayle~

4:33 AM  

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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 =