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BHM's Homesteading & Self-Reliance Forum
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  #1  
Old 07-16-2011, 10:49 AM
nadja nadja is offline
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Default Emergency Hand Crank Generator

Well, I think I found something this morning that may interest a lot of you. I don't know much about it just yet, but still worth taking a look.


http://www.facebook.com/pages/Hurricane-Wind-Power-Wind-Turbine-Technologies-LLC/146553008723813
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  #2  
Old 07-16-2011, 10:22 PM
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Just remember: Watts is watts. Cranking a generator requires you to exert enough energy to a) produce the electrical watts plus overcome the mechanical resistance. In other words, you're converting bacon & eggs into electricity, which requires lots of bacon and eggs!
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Old 07-16-2011, 11:55 PM
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Maybe. 50 watts. I'd like to take a look inside it.
Till then.... I know this one works:
http://www.ccrane.com/more-categorie...gy-source.aspx
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Old 07-17-2011, 12:13 AM
Mad_Professor Mad_Professor is offline
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For that kind of money a high output junkyard 12V alternator (ca. 120 amp) hooked up to an old stationary bicycle frame w/pedals , Complete the system with several deep cycle batteries and power inverter.
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Old 07-17-2011, 01:53 AM
patience patience is offline
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These devices would work okay for powering a radio and some LED lights in a camping situation, I think. For serious power, it would take a LOT of human effort to produce very much. I read somewhere that a world class cyclist can put out about 1/4 HP for a short time. One HP = 746 watts for an hour. So, 1/4 HP for an hour = 186 watt/hours.

That is enough to run my 60 watt flat screen TV, my 30 watt notebook computer, and a few CFL lights for an hour. I would think you'd be pretty pooped after doing that power generation, too. I vote for a solar panel and a battery.
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Old 07-17-2011, 11:25 AM
nadja nadja is offline
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Quote:
Originally Posted by patience View Post
These devices would work okay for powering a radio and some LED lights in a camping situation, I think. For serious power, it would take a LOT of human effort to produce very much. I read somewhere that a world class cyclist can put out about 1/4 HP for a short time. One HP = 746 watts for an hour. So, 1/4 HP for an hour = 186 watt/hours.

That is enough to run my 60 watt flat screen TV, my 30 watt notebook computer, and a few CFL lights for an hour. I would think you'd be pretty pooped after doing that power generation, too. I vote for a solar panel and a battery.
But, if you backed up an old 10-speed bike to it, added a pully to the shaft , then you could go through the gears on the bike and you would most likely put out some amazing power. Gear ratio would help you atain that I should think
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Old 07-17-2011, 12:40 PM
J R Adams J R Adams is offline
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Quote:
Originally Posted by nadja View Post
But, if you backed up an old 10-speed bike to it, added a pully to the shaft , then you could go through the gears on the bike and you would most likely put out some amazing power. Gear ratio would help you atain that I should think
A bicycle would just transfer your out put from your arms to your legs. Legs are generally stronger so you could generate more power longer with the legs.

HP = (torque X rpm) / 5252

You would input torque and rpm through the pedals and sprocket. Changing the gear ratio will change the torque - RPM relationship but will not magnify the HP input you are generating.
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Old 07-17-2011, 02:04 PM
grumble Male grumble is offline
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Good point, JR. Another thing to consider is that pedal powering a generator doesn't develop momentum, so there'd be no shifting through the gears, the load would be constant. To get momentum, a big flywheel would have to be added to the contraption.
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Old 07-17-2011, 04:29 PM
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That makes me exhausted just thinkin about it.
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Old 09-27-2011, 10:44 AM
Mitch Male Mitch is offline
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Hummmm, I built one once with a $2 bicycle and an old 36V DC motor off a satellite dish drive arm (dumster dived) and a cheapo volt meter to monitor output. All you got to do then is add one 10 year old kid to crank it

Mitch
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  #11  
Old 09-27-2011, 11:51 AM
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Quote:
Originally Posted by Mitch View Post
Hummmm, I built one once with a $2 bicycle and an old 36V DC motor off a satellite dish drive arm (dumster dived) and a cheapo volt meter to monitor output. All you got to do then is add one 10 year old kid to crank it

Mitch

Thats the ticket....get a 10 yr old hopped up on Halloween candy
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