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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Tuesday, July 01, 2008

Cumberland Island 6-10/6-14

Cumberland Island was an incredible mixture of different flora. On the East side there were beautiful, near empty white sand beaches with natural dunes; and on the West side it was similar to being somewhere in a jungle in Central America. Here are Tamer and the boys walking straight through the middle from one side to the other. We were anchored on the West side, and had to dinghy to shore and walk about a mile to get to the beach.

The boys immediately stripped down and started a sand ball fight :-)

For those of you that have had the opportunity to spend some time with Drake, you will understand how this picture captures his very being!

Walking back from the beach to the dinghy dock... It was an outstanding, breathtaking walk full of birds, spiders, and bugs.

The island is also inhabited by tons of wild horses. We got to see this one up close, and Drake thought that she was an orphan because she was so skinny and all alone. It made him really sad....

A big, nasty, dead jelly fish..... Oh yah, we also learned that you cannot bring a metal detector into a federal park, or you can be fined up to 2,000 dollars!

Tamer and I found this sea sponge on the beach during his birthday walk. We surmised that the red part was still alive, but the tan colored side had already died. We threw it back to the sea in hopes that we could save it, but found it back on shore when returning down the beach an hour later. The textures on the different sides were also very different, the tan was less slimy and more porous.

A HUGE, (also dead) horseshoe crab!!

After staying at Cumberland for a few days, we then went south across the St. Mary's River, and back to Florida to provision for the next leg of our journey. The little town is called Fernandina Beach and was really a neat place to visit, even though we only had a day. Down near the mooring area there is a lot of little shops, bookstores, pubs and they even had a great little farmer's market.
Here is Tamer returning from his share of the provisioning (90%). This bike has been a godsend to us, and I am sooooo glad that he built it back in Alaska. It can be taken to shore in the dinghy, gets 100 miles to the gallon, goes about 15 mph, and hauls an inordinant amount of stuff!!!

A close of shot of Tamer's hauling capabilities... Amazing!


Blogger Terrie said...

Well looks like Tamer is slipping write into the cruising lifestyle. But when he quits shaving we'll know he completely gone over to the other side! That's a pic I've gottta see. Tell the boy's Robbies misses them.

1:38 PM  
Blogger Gayle said...

The first photo "walking into the jungle" almost looks like it's from a movie set...too pretty to be real! I think I mention your adventures to someone almost daily. What a cool bike!

2:21 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%


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 =