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, June 03, 2007

Windows & Hatches

I do realize that the last post should have come after this one... Oops.....



Here is Tamer, removing the second window. We had taken out the first one, in the middle spot next to him, a while before to provide ventilation in the Salon.



Most of the old windows were not installed correctly the first time, and were breaking while they were being removed. All the windows that were already broken, or damaged during this project, were so because they had been pressure fitted and were touching the frame in 2 corners.
Oh yah! I mustn't forget to take a moment to explain Tamer's beautiful, multi-function hat. The heat has been getting to all of us now that Summer is really here. When it is 93', with about 85% humidity, no one likes to work in the sun. So..... To make his life more tolerable he bought this solar powered - fan blowing on your forehead safari hat on...... EBay! After some slight modifications done by Captain Smyth, the hat now also charges batteries for when you are not in the direct sun, and has a LED light installed. I really think that the hat is a great idea, and that the 'extras' are ingenious, but it does not change the fact that sometimes when Tamer is wearing the hat and talking to me, I cannot take him completely seriously :-)



Tamer and Sherron hung visqueen over the insides of the windows, so it would not be as messy inside the boat while I was sanding and grinding.



Here is the Starboard front side window frame, ready for some serious preparation.



Grinding the window frames on the Port rear area, and the sides of the salon cabin top.



That area, done and osphoed.



Tamer and Mom covering the whole cabin top to protect the finished, ready for paint surfaces.



Tah-Dahhhh!!!!!!!!!!!!



Here is an edge of one of the 7 deck hatches. The area was about 1/2" - 3/4" wide and FILLED with scaly rust. Part of this whole project is looking at a task, and having to devise a way to "make it happen"..... This really put us to the test.... I put a total of about 6 hours into each one. Tamer was able to assist me in getting them as clean and free of rust as possible. A huge job to say the least, and much more time consuming than we expected. Now it is on to the window frame portion of the hatches.



Showing off the 'Before' pictures :-)



Here are the new stainless steel hinges that Tamer so beautifully welded on. This is before the welded area has been ground and sanded.



This just shows the deck part of the hinge.



These hatches are awaiting just one more coat of paint, and their lids with new 3/8" safety glass. We should be able to pick up the glass in Fort Myers tomorrow (Thursday, June 14th). There will be a post later with them all finished!




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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 =