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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Monday, August 25, 2008

Everyone Should Read "The Rivah"! July 22nd - October 8th

Welcome to Urbanna, Virginia!! This was the first view that we had of Urbanna. We loved it here and I doubt that we could have found a community that was more welcoming and helpful. We have officially left a "footprint in Urbanna, Virginia".

Here is Blayde, off the deck as you can see, helping to raise the foresail. All the boys are really starting to understand the deck operations on the boat, and are readily becoming fantastic crew.

The way that we found Urbanna in the first place, was from a local magazine called 'The Rivah'. I was reading it one Sunday afternoon on the back deck of the boat, and found a whole section on a little town called "Urbanna". Of course, my first question was, where the heck is Urbanna?? So Tamer rode 38 miles round trip on his back to 'check out' the community and see if it would work for us. I do not think that there could have been a more perfect place! Tamer had to return to Alaska for 6 weeks for contract maintenance, and wanted us to be somewhere safe. The town marina at Upton Point was FANTASTIC!! We had a safe slip, water, electric, showers, laundry, wi-fi and a great staff there.

Here I am next to one of the trolley signs. The trolley runs until Labor day and costs only 25 cents to get where ever in town you need to go. We did not need to use it often though, because the pool, library, grocery store, coffee shop, video store, ice cream parlor, and favorite restaurant/social gathering place were all less than 7/10 of a mile from the marina.

A local church at sunset.....

The beautiful Miss Ann would come into Urbanna, and pass us at the dock every Saturday during their sunset cruise. She has recently been bought, and is out of touring commission.

The local miniature golf course and ice cream parlor provided some great entertainment the day before Daddy had to leave for Alaska on July 28th.

Hmmmmmm..... I think it should have gone in :-)

'The boys'

Blayde doing some work up the mast in the bosun's chair, shares his peace with the blog readers.

The epitome of The South! Garden & Gun was actually a very entertaining and informative magazine to read.


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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 =