A junk in the making? Can I make a 65ft circumnavigate vessel?

StainM,

The diet coke is to ensure low sugar content, ever try burn sugar in engine?


Now my problem is the propellar type and shaft, any ideas..............


What do you think of trimaran 65? workable in my shipyard? I think this is an advance project and I am just a beginner.....

Many people suggested Trimaran because the big space, fast hull, more sail and look different........ any input?


WDH

 

Maybe a quick stop at Galician Rías....?

 

Welly,
Working out numbers from the Bruce Trader 65 drawing in your attachement, here some basic parameters for her, assuming engine power as 205 HP (DIN, propulsion only):

Block coefficient: 0.47
L/B 3.54
D/L = 221.28
SA/D = 15.29
6*HP/D = 12.25
HSPD = 10.27 Kn
CSF = 1.43
MCR = 60.18
AVS = 118.34 º

So she looks like a medium weighted (quite light), safe, comfortable, nicely canvassed, sensibly powered globetrotter. My labeling shoud be M 15/12. A very nice motorsailer, indeed!

Note 1: I have a doubt at AVS value, as I have guessed an HD of 3.94', because at Bruce's drawing it is only stated draught as 6' that I understand as draught under her fixed long keel

Note 2: As stated Lwl and disp in Bruce's drawing are not the same as I guessed in my previous post, now you'll now need continuous 205 HP (DIN) at the engine, and a 39" x 36" 3 bladed propeller.
If you want to go 4 blades, then you'd need a 37" x 35" one. Bollard pull should be in the range of 4,800 pounds. (All rough numbers)

 

Joke Welly and yes I have tryed burning sugar in engine and it's not a problem. That it destroy engine is something I can not figure out. Ome off those myth I gues. With temperatures abow 1000C what is left off sugar?
NOTHING

 

Galician Rias.... is a must..... beautiful place, I have a feeling Europe have different feeling and view like looking through a brilliant diamond. perfect cut.

Thanks, I will try to figure out the math with someone on the reply. I only secondary school educated...... so........ it does take time. my drive however will help me......

Thanks a millions.

WDH

P.S. The picture with the wine seem to be sea worm? U can eat Indonesian frying sand worm at Lombok Island.......Indonesia

 

What is your opinion StainM on Gilly's lastest calculation, since you are also a Porpulsion guy............... Any other alternative option, what is 5 blade for? fast planning hull?

Does the length of the shaft effect the performance of engine? I heard you can reverse install the shaft so the engine in on the shaft, save more spaces.

 

" what is 5 blade for? "

Blade area.

The most efficent prop would be a 2 blade , of proper size but to get the required blade area the diameter would be rather large.

The big 2 blade advantage (besides powering efficency ) is the ability to install a prop brake on the shaft and line the prop up behind the deadwood for minimum drag.
A good compromise if you don't have $12K+ US for a CP or VP prop.

If the boat is to SAIL! reducing prop drag is necessary, have you ever towed a 35 inch drogue ? Performance ZERO!

FAST FRED

 

No, for God's sake! They are 'percebes' (Pollicipes cornucopiae), a galician quite common (and expensive) barnacle. They are delicious.
The wine is an sparkling Galician white whine, from 'alvariño' grape. It serves cold and is excellent to be enjoyed with shellfish dishes. The 'alvariño' grape is said to have come to Galicia in the Middle Ages, brought by German monks wanting to produce here a 'Libfraumilch' style wine,
More on Galician wines:
http://www.idealspain.com/pages/Food/galiciawine.htm
http://www.msnbc.msn.com/id/11622735/
http://www.everywine.co.uk/every-wine/indexb1.html

 

Welly,
If two bladed you'd need something like 41" x 36" for a 205 HP 1800 rpm engine (heavy duty), 3:1 gear. With a 2:1 gear, 29" x 23" would be enough. You have to find out what space you have to locate the propeller, allowing for proper clearances.
Cheers

 

CP and VP prop what is the diffrent any picture to show?

I intent to get shallow draught keel, will bilge keel or tandem keel any good for me in term easy docking for bilge keel and tandem for better steering and against storm? Just curious..........

As for trimaran vs catamaran for circumnavigation which is more optimised?

Thanks

 

Here is picture of the initial design of the interior just send by email so any comment? It is too simple, I have ask for better design.

 

Jeff can this thread be moved to Open discussion please..... Because it will include alot of info general and not very optimised to be in this sub-forum THANKS.

Wellydeckhand

 

Propeller blade

Are 2 bladed propeller efficient for full displacement motor sailor (100 footer)? Can they be 'close' like the smaller size ? I had like to know about something simpler and cheaper than a variable pitch (vp).

 

Are 2 bladed propeller efficient for full displacement motor sailor (100 footer)?

Theoretically yes , but it would be really hard to get the required blade area in the draft of most boats.

The CP controllable pitch or VP variable pitch prop of 4 blades will probably be best choice.
IF the boat is to motor only , no sailing expected , a metal fixed pitch will be just fine.

FAST FRED

 

I have asked around, they all suggested the 3 blade system, 4 blade for strong engine......

I have hear alot of rusted hull dotted the Australian lanscape because of the popular Do-It-Yourself mentality without equipment, weld knowhow and money..... I gotta be careful myself.

WDH