Stirling engine generator/hub motor idea

Jemma Hawtrey

New Member
Dec 29, 2007
288
2
0
Essex, UK
Given we run IC engines on the bikes we are all wasting one large energy resouce... aka the heat from the exhaust.

These engines when running produce a hot exhaust which is just basically transmitted to air in the fumes and by radiant heat.

How about fitting up the muffler of an engine with a stirling heat engine running a small 12v generator (a bottle wheel dynamo for example). The power from this could be used to trickle charge a battery on the bike all the time the engine is running and/or used to provide lighting.

The battery could then be utilised to power a hub motor for short bursts, such as hill-climbing or fast running for short periods...

The advantage of this idea is that there is no drag on the drivetrain so it doesnt slow the bike.

just a thought..

Jemma xx
 

stude13

New Member
May 28, 2008
404
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north bend wa.
hi jemma; i enjoy your way of looking at the possibilities of these little engines. as soon as i can i will try nitro idea, the sterling is beyond me. again you go girl. mitch
 

Tj Bunch

New Member
Jun 18, 2008
139
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Jemma, Always thinking outside of the box that is so cool. I never get these cool ideas my brain is always confused with other Crap lately.
 

Jemma Hawtrey

New Member
Dec 29, 2007
288
2
0
Essex, UK
Jemma, Always thinking outside of the box that is so cool. I never get these cool ideas my brain is always confused with other Crap lately.
Umm... I have plenty of 'crap' to distract me at the moment... being almost to the point of eviction and a terminally ill girlfriend being the two major issues at the moment.
But its true, I do have a unusual mind that seems to go off at tangents... another being using a stirling engine generator to help power offices, using the waste heat from all the servers & computers in said offices

Jemma xx
 

deacon

minor bike philosopher
Jan 15, 2008
8,117
3
0
north carolina
The only think I see that would cause me to wonder is the extra weight of the components not the generator but the battery it charges. It might be good to run a lighting system while the bike was moving but I wouldn't try to store the excess. The weight of the storage would probably cancel out any good from the generator.

Lights and horn now there's the ticket.
 

deacon

minor bike philosopher
Jan 15, 2008
8,117
3
0
north carolina
I have run ebikes they call hybred but they have no heat source. I have never run a gas and electric bike. I would think they would be terribly heavy and hard to manage though.
 

badjester

New Member
Aug 31, 2008
12
0
0
seattle area
Maybe if you wrapped a length of the exhaust with a coil that heated vegetable oil and fed into a small resevoir you could use this heated oil as the expansion side of the engine and use some fins on the air cooled vacuum side.

Then the stirling engine could keep running even when you are done riding and could then charge the batteries over a longer period of time.

Running the stirling engine on a shimano hubs an idea I've kicked around awhile. But I've only worked with beer can engines myself and have yet to make that much power, but I've seen engines that could and would probably benifit from one.

These engines get pretty big and make little power to size, but , it really aint that necessary to make huge watts when these batteries will only absorb so many watts per hour anyways. Maybe a smaller output but long lasting and "FREE" generator would be good? interesting.

Cool idea... last one I thought I'd see here but you made it apply. Rock on.
 

lennyharp

New Member
Jul 19, 2008
429
1
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Mesa Arizona
Here is a hybrid in the works at Staton-Inc...

Motorized Bicycles Detail Page

Motorized Bicycles Detail Page

It will be pricy but should be well done when he does it. The technology is here we just need more people doing the builds. I am not the right motor/engine guy to do the early work but will jump on board down the line when I can understand it enough to do it in a repair on the road situation. They are heavy and will use extra energy for now.