need 40-65' tugboat plans.

Thanks for all the info guys!!
Yeah the larger volume isn't really an issue for me i plan on running a coal powered steam boiler and engine of my own design... but i do agree finding a tug hull that isn't totally rotted out and in my area also and for cheap not very likely...
Right now i'm pretty much in a research phase... been playing around with some hull designs in a CAD program might send one out to a 3d printing place to have a scale model made up to do some testing!!

 

CAD printed model to test. Wow. Keep us informed please.

 

yeah there's an online company called Shapeways that does 3d printing here is the link
http://www.shapeways.com/
All you have to do is upload the 3d model to the site and the charge by the amount of material used to make it and shipping and they have tons of different materials to chose from! I figure its a fast way to do some inexpensive R&D

 

Hi-- dont know when this thread started- what size hp and boiler hp are you looking to put into your tug?..for a 50 ft'er you can go with 15-18 hp geared down to 3:1 turning at 500 rpms--that should give you lots of torque but your not going anywhere fast...have you though of a smaller tug- using the small tug as a tender vessel?..mal lows designs are great and i am presently finishing off the frames for a 27 ft'er- i have a choice of hydraulic drive or steam. ..since i really wanted twin screws i thought of using two 9.5 hp singles. but this is more expensive than going with a single 18 hp which i can get for about 2800.00 u.s. delivered by a company in india called tiny tech..
anyway- the idea is for the smaller tug to push a small barge , thus making mooring costs non existant.simply anchor the houseboat barge and then use the tug as the tender vessel. seems like having an tug and not at least doing a bit of work is a waste but hey thats me...
I work for a guy that makes steam engines..,adding a boiler will help with ballasting especially if you go with a firetube which is really a marine type since it holds its steam better for longer requiring less tending to feed her.

im very interested in your project--please keep me posted ...

i love tugboats and cant wait to finish mine so i can be steaming her..whether diesel or steam...

 

also here is a good 45 ft design...great for steam too!

 

Data Input
Waterline length in feet: 45 feet

Beam at the waterline in feet: 12.5 feet

Hull draft in feet (excluding keel): 6 feet

Vessel weight in pounds: 70000 lbs

Engine Horsepower: 18 HP
Number of engines: 1
Total Engine Horsepower: 18 HP

Engine R.P.M. (max): 500 RPM
Gear Ratio: 3:1
Shaft R.P.M. (max): 167 RPM

Number of shaft bearings (per shaft): 1
Desired speed in Knots: 7 knots


Horsepower Calculations
This will calculate the maximum horsepower and torque available at the prop(s).

Total available horsepower at the engine(s): 18 HP
Total available torque ft/lbs at the engine(s): 189 ft/lbs
Horsepower loss of 3% per gearbox: - 0.5 HP
Horsepower loss of 1.5% per shaft bearing: - 0.3 HP

Total horsepower available at the propeller(s): 17.2 HP
Total torque ft/lbs available at the propeller(s): 542 ft/lbs

Speed & Power Calculations
Basic displacement speed and horsepower required
Displacement hull speed (1.34 X sqrt of waterline length): 8.99 Knots
Minimum horsepower required at propeller(s) for Hull speed: 138.8 HP

Calculations based on desired speed and available HP
HP required at propeller(s) for desired 7 knots speed: 66 HP
Estimated speed with existing 18 horsepower:
This is the speed we will use for the propeller size. 4.46 Knots

At this point it is important to note that all of the calculations above are based on full RPM and HP. Most engines are rated to run at a percentage of thier full RPM. This is what will determine your maximum cruising speed. The propeller sizing calculations below are based on 90% of full RPM, which allows the engine to develop it's maximum power without overloading. The chart below shows typical engine ratings, you can find this information in your engine specifications.
Recomended RPM for continuous operation
Type of engine % of max RPM
Light-duty gasoline and diesel automotive conversions 70 - 80%
Light-duty or high output marine diesels 80 - 85%
Intermittent-duty marine diesels 88 - 92%
Continuous-duty heavy marine diesels 98 - 100%

Propeller Size
Number of blades Diameter (inches) Pitch (inches)
2 Blade 54.5 X 56.7
3 Blade 51.9 X 56.1
4 Blade 48.8 X 55.0

The propeller sizes shown above do not contain calculations for cavitation or blade loading.
If you find that the recommended propeller is too large to fit your vessel, you can try increasing the shaft speed. Failing this, you can reduce the diameter and increase the pitch at the expense of your propeller efficiency. The rule of thumb is 1 inch of diameter is equal to 1 1/2 to 2 inches of pitch.

 

I planed on designing and building a engine and boiler. For the engine i was thinking of a uniflow type with a boxster piston configuration. id like to build a small scale version of this engine and see how well it works then if and when i find or design a hull i like i could just scale the motor up! right now iv got a lot of stuff on my plate so i havent had the time to experiment with anything but when i get to ill be sure to post more!!

 

geez--not familiar with a boxster piston?..is that a piston valve?..much more efficient than -d valve...love the project--keep me posted..i think steam is amazing...

 

A boxster piston configuration have pistons that move in a horizontal plane they have a natural dynamic balance and a low CG because there flat. i figure if the configuration works good as a combustion engine it should work just as good in a steam engine!
here's a link about boxster combustion engines...
http://en.wikipedia.org/wiki/Flat_engine

And here is a link about the Uniflow steam engine...
http://en.wikipedia.org/wiki/Uniflow_steam_engine

 

After reading those two wiki articles I think you're on to something, but I suspect the finished engine will be quite wide. Depending on the power density of the engine and how big it needs to be for the requisite HP, this may not be a problem.

Maybe you can borrow seabirdship's design for a Tesla turbine for your genset

 

the YTL 45ft tug plan

Hi Tugboat. This is a great plan. Exactly what I am looking for as I want to build this Army YTL 45ft tug boat as a static display model. Do you happen to have hull section drawings of this boat? With the hull sections and the plan you provided I would be able to re-create the tug in a 3D software as the foundation for the static model. Thank you in advance.

Sorry I cannot send an email to you so I have to reply to this thread.

 

I saw them somewhere in the Fremont Tugboat site. It was just the hull lines, no cabin or anything, a top, side and end view with no dimensions but all the lines needed.

This is from there also, with much bigger pictures, about 1/2 inch down the page. It's not what you're looking for, but I just want to document it on this site.



http://fremonttugboat.com/blog/

.

 

Hi SamSam,

It is a great lead. Thank you. I have read Fremont's blog before and it has vast information on tug boats I will dig it deeper there! Cheers!

 

Here are the other drawings for the YTL

View attachment __20101101_0001.PDF

View attachment __20101101_0002.PDF

 

The U. S. Army Transportation Museum at Fort Eustis near Newport News, Virginia has a US Army 45' tugboat built in 1952 on exhibit.
https://www.flickr.com/photos/planephotoman/2427421408/in/photostream/
https://www.flickr.com/photos/planephotoman/2426603227/in/photostream/
http://www.transportation.army.mil/museum/transportation museum/museum.htm