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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Thursday, February 01, 2007

Uhhhhh... Tamer, your boat is on fire!!!


So, there we were, peacefully enjoying our lunch in the cozy confines of the trailer when we hear Deena (A wonderful person who has been around here with her partner, Don for ages) say, "Tamer..... your boat is on fire!!" I still haven't figured out how all those boys got out from around the settee and made it to the boat so quickly. Blayde even went without his shoes! When we got to the boat (about 300 ft away), Don already had a hose and it and had extinguished the 5-7 foot flames.



I have to steal a famous line from South Park to share my personal thoughts on this event...

"I learned something today."

Tamer was busy up on deck welding, grinding, welding, and grinding, while Blayde stood fire watch (ironic, huh?). Valin and I were inside the boat cleaning all of the work areas, so they were also less of a fire risk. I sent him out onto the deck with a bag of old moldy curtains, and pieces of junk wood from the interior, to put there until we got off the boat the next time. First mistake; You never put flammable trash in the same area that someone is welding and grinding!!! Second mistake; You don't remember to haul the trash off of the boat and put it in the dumpster, so that it can catch fire, and no one knows it was you that made the first mistake!!! Third mistake; if you are going to make the first 2 mistakes, you should inform the Foreman of what you have done :-)



The water soaked remnants of very flammable trash on the back deck (also known as the Poop Deck). Tamer and I were thinking of inventing a new flammable drink, and calling it 'The flaming poop deck'.



After the messy clean-up.... Fortunately, we will be sandblasting and repainting this part of the boat before we launch!!


posted by CT | 6:43 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%


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 =