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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Sunday, December 31, 2006

Superman goes bald for '07

In a startling new years resolution, Superman reportedly has vowed to remain without hair through the year of 2007. Although his reasons for this change in appearance are not clear, he has confirmed that "it will not have any effect on my ability to fly or see through textiles, and that's all that really matters". Asked about the sudden presence of facial hair, he said only "well, I don't want people confusing me with Sinead O'connor".

Wonder Woman, who had "no comment" on the issue, was seen yet again accompanying superman, casting new doubt on her rumored engagement to the green lantern. While the green lantern could not be reached for comment, this new sighting in downtown metropolis adds fuel to the speculation that surfaced when the infamous "superfriends" video was posted on the internet by an unknown source. The invisible man, also reported to be in the risque video circulating the web, has categoricaly denied any connection, saying "Can you see me in the video? No. because I wasn't IN the video. I don't even know those people."

Vidographer and self styled sceptic Michael Moore, the first to call attention to the presence of the Invisible Man in the video, was quoted as saying "No one can tell me that there isn't an invisible man, standing right there.. see it? Yeah, right there where it looks like no one is standing, but there's just enough room. Right there is where he is standing, just watching." Mr Moore is said to be nearing completion of his controversial documentary film "Fahrenheit 912: the invisible menace"

2 Comments:

Blogger jennifer said...

I thought I would start the new year celebration by catching up on your blog. You two have made an imprint in my life that will always exist no matter where life takes me and I am so appreciative to know the two of you. I hope your dreams take you everywhere you have ever hoped. Take care and I will be seeing you somewhere down the road...... ;-)

6:06 PM  
Anonymous Anonymous said...

A healthy, happy, and prosperous New Year to the Smyth family and all readers from

Dee and Hank Smith

10:22 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 =