The Steamboating Forum

Speed in knots....

Displ. 2.5 5 10 15 20
2000 6.29 7.93 9.99 11.44 12.59
3000 5.50 6.93 8.73 9.99 10.99
4000 4.99 6.29 7.93 9.08 9.99
5000 4.64 5.84 7.36 8.43 9.27
6000 4.36 5.50 6.93 7.93 8.73
7000 4.14 5.22 6.58 7.53 8.29
8000 3.96 4.99 6.29 7.20 7.93
9000 3.81 4.80 6.05 6.93 7.62
10000 3.68 4.64 5.84 6.69 7.36

How accurate this is at very low power levels
isn't clear, because it doesn't take into account
skin friction.

- Bart
'

Probably a complete coincidence but my boat, which I'm guessing weighs about 2000 lbs and is rated at 5 b.h.p., will just hit 6.3 kts. What with various fudge factors and efficiencies, I suspect that 2.5 s.h.p. isn't far off!

Of course, the pressure soon drops at wide open throttle, hence my interest in all these gadgets to crank out more steam.

Mike


Mike

Those other numbers were for a boot 30' on the waterline.... yours is 24' IIRC:

2000 5.63 7.09 8.93 10.24 11.26
3000 4.92 6.19 7.80 8.93 9.83
4000 4.47 5.63 7.09 8.12 8.93
5000 4.15 5.22 6.58 7.54 8.29
6000 3.90 4.92 6.19 7.09 7.80
7000 3.71 4.67 5.88 6.74 7.41
8000 3.55 4.47 5.63 6.44 7.09
9000 3.41 4.30 5.41 6.19 6.82
10000 3.29 4.15 5.22 5.98 6.58

While this doesn't affect our little day launches as much, cruising boats often run heavier
than people consider... what with water, fuel, people, food, drink, etc. many boats run
heavy, esp. on trips. A couple of us beefy crew and a bit of lunch, and we've added
25% to the weight of your boat

- B art

It's worth noting that at 6.3 kts. the stern wave is alarming! Far beyond anything that might be considered 'hull speed'.

Which comes back to my old niggle. What the hell is the waterline length. It seems like a very illusive number. Mine varies from 20' to 24' depending on speed.

Mike

Waterline length is customarily measured at rest. Racing sailboats often had excessive overhangs to gain unmeasured W.L. while heeled.

As far as a clipper bow goes, If it looks good to you, there is most likely no reason not to use one. If it interferes with something, or is more trouble than it's worth aesthetically to build, plan something else. I've changed my plans so many times, it could be considered a portfolio .

Hey Bart

You know… I do have a copy of skenes elements somewhere. I got it 16 years ago when I was trying to get my ducks in a row for a 47’ Cutter I had designed. I will have to go dig that out of the bookcase!

What kinda draft do you think would be ideal? There are a lot of islands in the sound with no docks. Nosing into the shore is what I was hoping for rather than hauling a dinghy about. But if the dinghy is the way I have to go then so be it.

Yes I will trailer. I have the storage space at home and plenty of easy boat launches on Lake Washington and the Puget Sound within an hour of me. I don't fancy dropping that kinda money into a hole in the water just to let someone else watch over it during the off-season.

My rig is a 1969 Ford 1ton 4x4 diesel and will be setup with a bunk for a fifth wheel towing arrangement so moving the boat and trailer around will be no problem. I have run some numbers and think the whole shebang will be just under 7000#. That is launch and trailer together.

Sleep aboard yes for two inside the cabin and wherever anyone else can flop out a sleeping bag in comfort. Yes there will be a head; some of the females I know will not travel far from an electrical socket let alone a privy. Take a look at Annabelle I will be a foot wider but that is what I am aiming for, saloon, frilly canopy and all.

Range is a decent day putting around or long straight shots. For the short day/weekend trips I will use wood /w oil backup and for the long hauls I will fit extra tanks for oil /w wood backup. Or the tanks may be built in, it all depends on how things work out during construction.

A self-inflating something will be carried in case of accidents.

The truck and trailer will not be over the 8’ wide mark and under the 75’ max length of the state patrol set limits. The trailer I will be building for the launch will be a fifth wheel.

Thank Ya much for the input.

Cheers, Scott

Hey dhic001

After reading a lot I kinda got the idea the straight up stem was more of a common build than anything else.

I think the final beam will be more like 7' something, anyway I will be happy if it can hold five knots, just so long as I don’t have to use the ores! And since I am aiming for something I can take on long trips more storage room is better.


Thank Ya Much for the input!

Cheers, Scott

Hey Mike

Yes I may have some problems getting her off the shore. If that becomes the case then I will have to find an anchor and a dinghy...


Thank Ya for the input!

Cheers,
Scott

Hey Fred

I had not considered that angle, I will be roaming around on the Puget Sound sooner or later and it gets pretty choppy sometimes so go over the waves rather than through them sounds better to me. Bobbing up and down does not bother me, in fact I seem to be immune to motion sickness unless I get stuck in a dryer… don’t ask…

Thank Ya for the input!

Cheers,
Scott

Hey Detriotug

Thanks loads for the video link! That water looks about like what we see here on the Puget Sound most of the time and I have sailed on it enough to know it is fine by me.

I spent a few years around 1985 driving tractor-trailer combos in this area. The most interesting items I ever carried were the pilings they used during the construction of the Spokane Street Bridge. Tractor, jeep, steer-car, jeep and all were 135 feet long. We transported them four at a time down from Associated sand and gravel in Everett. The next most interesting were a set of six bridge beams from a place here in Woodinville. They were 90 feet long each and 9.6 feet tall. There was one per truck/steer-car combo and they were delivered to Cashmere over the pass during the winter. Did you know that it takes a little over 5 hours to chain up 48 brake axles in the snow on top of the pass? That was an interesting night.

Thank Ya for the input!

Cheers,
Scott