Build A Power Boat , Powered By Wind

did you try craigslist?

 

The solar boat had lunched last year

Thank you!
The solar boat:

http://www.guardian.co.uk/environme...olar-powered-boat#/?picture=361034528&index=9

I think our design would be more practical in use than that solar boat. Most
of the coastal area is windy in the world. The wind turbine will get more
energy than solar panel in average. It is difficult to blend the big area of
solar panels to a normal boat also.

 

Your design isn't even workable let alone more practical than the multimillion dollar project you linked to. Looks more like an Ethiopian princess in distress letter than a legitimate proposal. Some folks tried to give you advise but you ignore it and go on about efficiency and investment. Which has pretty much led everyone to right off the idea as a scam.

I'm thinking that if your going to insist on continuing to ask for money on a project that is so obviously impractical then it might be time to ask that the thread be closed.

 

Seriously windboat. Tell us the range and charge times with average yearly wind speeds in your area. Plus show your calculations.

 

Thinking is great, but you need to do some basic calculations, as we keep pointing out to you, something which you seem intent on ignoring.

Do you actually understand the basics, like how much energy there is in a given cross section of wind at a given wind speed? Have you heard of, and understand, the Betz limit?

I've already pointed out the cube law relationship between wind speed and power, a relationship that means that wind generators produce very little power at low wind speeds. This will, as I have already pointed out to you, mean that you have a massive deficit in charging power, compared to propulsive power used.

Don't be so quick to suggest that solar power is less capable than wind power, either. Solar has significant advantages, as panels can be incorporated into the deck and cabin top at the design stage, as in that vessel you linked to, plus sunlight is available every day, and even in cloudy conditions modern panels can work well. Solar panels don't need a big heavy mast, either, neither do they create significant additional windage, so their poorer efficiency when compared to a wind generator is very largely offset by other factors.

 

Clouds are often associated with wind, and sunshine with calm conditions. So it appears as though wind and solar would be complimentary. I'd rather a lot of panels and a smaller wind gen or 2 compared to the other way around though.

 

Jeremy's solar boat is good

Jeremy's solar boat will cruise 8 hrs and recharge in 12 hrs of sunlight, that is
very good. In Taiwan, there are some solar boat use for sight-seeing in lake
and river. Their spec are double hull ,2X20KW motor, 13 m long, dead weight
5000 kgs, solar panels 3KW,battery capacity: 26KWh(recharge tine 10hrs sun light). The performance
in Max. speed 9Kts, run out in 45 mins, the range=6.75 nm
in slow speed 3kts , last for 9 hrs, the range= 27 nm
the boat cost US$300,000 each. Photo:
http://www.wretch.cc/blog/liautiamding/25019503

 

Yacht maker didn't like renewable energy always

We are trying to clean the world. Do you know diesel oil pollution have do to your lungs?

 

do some basic calculations

This project is to dominate renewable energy, generally will not make profits in 1st boat or nearby.
You ask about the range of the boat, I can tell you roughly only, because there are too many variable factors in real using
batteries. The motor 100KW , the battery capacity 108KWh in max speed 14kts ,run out in 1hr, range =14nm . In slow speed 4-5kts run out in 7 hrs , range=35 nm.
Re the charge time, 10kts wind =5 m/sec, the wind turbine produce 1.2KW( subject to different brands and needs to check
the performance curve of each individual wind turbine) it takes 100 hrs to charge batteries. In our area, the mean annual wind speed is 5-6 m/sec around coast , 5KW wind turbine will produce 6500KWh among the year, 54 times of recharge approximately
in a year. That is equal to recharge weekly. If the owner curise 30nm every week , then goes 1620 nm in one year. You can

do market research, how many private boat onwer cruise exceed 1620 nm ? In our country less than 5%.

 

windboat

What if the unlucky future owner wants to visit some relatives up the coast over a weekend. Easy distance, 60 nm both ways?

Is this too much to ask?

Lurvio

 

In some emergency conditions, These methods will not against laws:
1. use shore power to recharge batteries
2. bring a gasoline generator on board and charge batteries
3. put a sail on mast, the wind will do push the boat

 

have you figured out the weight of the hull vs the length and then determined the resistance. Might shed some light on why other than simply a one hour burn the project looks kinda shaky. Knock that motor down to say 12kw and then recalculate for say a 3 hour burn time and see what kinda difference it makes. 12kw might end up being enough to get the same speed as that 100kw and most likely with greater range.

1200wats pr battery ( 100 amp hrs at 12 volts ) = 10 batteries pr hr at 100% efficiency or 30 batteries for 3 hours. Going cheep and using car batteries ( your way better off with something like the Roll Surette ) your weighting in at about 35lbs each or 1000lbs vs the 6000lbs you proposed. If your boat is 15 meters or 52ft then its hull speed is about 9 knots not the 15 your proposing, by keeping the speed down to bellow hull speed your getting the best bang for the buck. A boat weighting in at 20,000lbs at 52ft would need about 15hp to go about 7knots. If you got it down to about 15000lbs you might be able to eek out another knot and dropping it another 5000lbs gets you another knot. At which point you start getting into going over the hump to planing speeds, which your not going to be doing with a helicopter stuck on top of what looks like a blunt nosed barge. So if you don't need more than say 12kw of power then why insist on a motor ten times the size required ? Your still going roughly the same speed and distance.

I've played with my own electric designs and no mater how you slice it unless its just a launch, its just not a workable plan, and its hugely expensive.

 

12 kw of power seems not enough

Our project is a boat 16m long, dead weight 9~11 MT. In some circumstances(onshore wind and current), a 12KW motor will make the boat
nowhere but pier.

For some small electric boat, dead weight 1000 kgs below. You may use
motor 3KW-15KW Brushless dc motor (48V, 60V,72V) with controller, to optimize your system. That will not cost you too much. You can e-mail
me for details. Or, you can use an old golf car's motor. that will help

 

This calculation is massively in error, because you are ignoring Peukert losses, those which come from the combination of battery internal resistance and chemical energy transfer losses, both of which are heavily dependent on discharge rate and will be high for rates around 1C or more.

Your 108kWh nominal battery pack will have an effective capacity of around 80% of this at discharge rates of 1C, so will only give around 86kWh of stored energy.

For battery longevity you need to ensure that the batteries are never discharged below around 25% remaining capacity (doing otherwise will massively shorten their life) so this further reduces the usable battery capacity down to about 65kWh.

At 100kW your battery will run the boat for less than 40 minutes.

If your wind generator can produce 1.2kw in a 10kt wind, then it must have a peak rating that is much higher than the 5kW that you quoted earlier. A typical 5kW wind generator will struggle to deliver more than around 600 watts in a 10kt wind, many will produce less than this.

You are also ignoring the charging losses, which mean that you will need to generate around 20% more power than apparently required to get the batteries re-charged.

As I have said repeatedly to you, you really do need to go and do the calculations properly if you are intent on pursuing this project. At the moment there are very large, and optimistic, errors in the figures that you have presented.

 

Do you have evidence to support that claim? Have you determined hull resistance and windage? Do you know how much power the boat really needs or are you just guessing?

Here's a question for you. Imagine that your boat has sails, instead of the motor, but that it has the same weight, length, beam etc. How much power do you think that the biggest set of sails you could fit would give you? The power calculation is quite easy, all you need to know is the wind speed, boat speed, the sail area and the efficiency of the sails in converting wind power into propulsive power.

I think you will be surprised at just how little power even a big sailing boat delivers from its sails.