Hey has anyone straped one of these to their bike? for fun!

I think you'd be far better off using a gas motor directly driving the wheels, and use a regen controller to recharge the batteries.
 
45 Lbs ouch. You can buy a little 4 stroke gas engine kit and strap it to the ass of your bike and it only adds about 14 lbs.

http://www.bikeengines.com/
 
It says it only does 650 Watts of output, I don't know if that would be enough to power my e-bike as it is (960 watts max). That is a scary thought to carry around more battery power than a portable generator :!:
 
sabrewalt -i like that 4 stroke engine nice 0.81kw continuous! and only 14lb!

do you think it would be more efficient to charge the batteries than to turn the wheel? you could set the motor at the peak efficient rpm. if you charge and discharge the batteries at the same time would they over heat or would you just simply be using the batteries as a big capasitor (balancer reservoir) so it would stay cool?

shame it doesn't mention noise DB's. i'm interested in this for a series hybrid bike but i don't think it would pass as an electric bike anymore.

Cheers
 
I was going to build a generator using a Honda GX-31 4stroke motor. I have most of the pieces, but not the time. I think the whole thing would weigh under 10 lbs. A rack mount would make it easily detachable, and just a few wires to plug in.

The generator only needs to supply the average power needs of the motor, which are much less than the peak. Even if the generator could only supply half the power needed, that would double your range before you would be forced to slow down.

The generator can be designed to keep the motor at it's most efficient rpm, which largely makes up for the losses in the electrical. If I use a brushed motor as a generator it would be easy to use it as a starter, so automatic/remote control would be easy.

While some would argue that using any kind of gas ICE is bad, due to range limitations imposed by current battery technology, it might make sense for long range applications. It should be possible to run it on E85 ethanol or pure ethanol with minimal modifications.

On the downside, it sounds like a weed whacker. Not real loud, but still a weed whacker. Vibration might be sort of an issue too, but isolated mounting would reduce that.
 

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i think battery over heating will be a problem but i'm not sure.

keep me posted

Cheers, Matthew
 
Fechter: What sort of wattage numbers do you think that 10lb package will produce? Do you think it could do 8-900W continuous?
 
Monstor, Those little engines put out between 70 db's at Idle to 85 db's at Full Throttle according to the website. This is measured at 3 Ft.

By contrast, Revopower reports there non existant "wheel" at
Less than 65 dB at a distance of 7.5 m. 7.5 Meters is over 20 ft away. So at 3 ft your probably looking at 85Db as well.

A hybrid is an interesting idea. Sneak out of the neighborhood on Electric power and then fire up your engine out on the main roadway.

That 200 MPG they report for the Golden Eagle could actually be stretched to over 300!!!!!!
 
According to the spec sheet:

Type 4-stroke, overhead valve single cylinder
Total Displacement 31 cm³ (1.9 cu in)
Bore & Strike 39 x 26 mm (1.5 x 1.0 in)
Max Horsepower (Gross) 1.1 kw ¹(1.5hp ) at 7,000 rpm
Max Torque (Gross) 1.64 N·m (0.17 kgf·m, 1.21 lbf·ft) at 4,500 rpm
Compression Ratio 8.0
Fuel Consumption 340 g/kWh (250 g/HPh, 0.55 lb/HPh)
Cooling System Forced-air

Assuming 85% efficiency for the generator, would give a max around 850W. Running at maximum power will make it wear out pretty fast. It's also not the most efficient rpm. I was thinking of running it at more like 600W.
 
Almost 3000Wh/kg :D

Even if you take the generator package weight plus 1kg of fuel, it's still over 500Wh/kg. I'd gladly ditch a few battery cells for that kind of energy density.
 
I have a Yamaha 1000 Watt generator (I use it on remote fishing trips to keep the battery in the camper charged), and have seriously considered strapping it onto my trailer for a long and/or multi day ride. The generator has a low speed setting which is in the mid 50's for decibels. It will run for about 10 hours on 1/2 gallon of gas. It weighs less than 30 pounds. One reason I haven't tested it out, I only use one 2 amp charger for the 36V 36AH SLA pack, and would want to push at least 10 amps at the pack, maybe more.
 
Aren;t some of those Hubmotors regenerative??? Soooo Mount up that GEBE kit. The bike will think it's going down hill and recharge the battery via the hubmotor being pushed by the bike engine.

Watcha think????
 
sabrewalt said:
Aren;t some of those Hubmotors regenerative??? Soooo Mount up that GEBE kit. The bike will think it's going down hill and recharge the battery via the hubmotor being pushed by the bike engine.

Watcha think????

That's what I was thinking, sort of a plug in hybrid. The Honda GX50 puts out 1850W and weighs only 5.5kg dry.
 
sabrewalt said:
Aren;t some of those Hubmotors regenerative??? Soooo Mount up that GEBE kit. The bike will think it's going down hill and recharge the battery via the hubmotor being pushed by the bike engine.

Watcha think????

That would work too. That would be a parallel hybrid.
Most controllers won't regen until you exceed the no load speed, but for flatlands, the gas motor might get you there.

I sort of like the series hybrid approach better. Both are workable.
 
This was a concept I was working on for a trailered generator rig, but never did any experimenting:

120V AC generator with voltage regulator to hold close to 120V
Transformer to step down to a voltage just above trickle charge voltage at the battery pack (must consider voltage losses in rectifier and filter)
Bridge rectifier to convert to pulse DC
Coil-capacitor filter to smooth DC

The output voltage DC would be held at a point that would charge the batteries above a trickle charge level, but not enough to cook the batteries during long rides. While under load, the voltage drop on the DC side would cause the AC side to regulate and add power to the gas motor. If the generator could not handle the instantaneous load (for example when first starting out), the batteries would kick in to keep the DC voltage level at their charge level.

I was looking at the Honda 1000W model because it was a nice package and seems reliable. But I don't think you need anywhere near 1000W, at least for my 600W brushed hubmotor. If the batteries provide amps during peak load, and the rest of the time they are in charging mode, I bet you could use a very small gas motor to power the generator, maybe more in the 500W range. My guess is that the generator would need a little bit more than enough wattage equal to cover power use during top speed runs on a slight incline.

Its all theory though, I don't really know how hybrids manage to regulate battery charging and motor control. There may be a better way using a DC generator.

But this is a lot more cost effective:

3.%20The%20PUSHER.JPG


http://www.staton-inc.com/Details.asp?ProductID=2729

Yes, I know. The dark side.
 
i only like the idea of serial hybrid. i see the advantages to parallel but i'm pretty sure i would get pulled over. with serial, the generator would not rev up and down with acceleration, so it would not sound like a motor bike.
 
sabrewalt said:
You can buy a little 4 stroke kit and strap it to the ass.

hmm... yess.
Speaking of strap-ons & fun.

Ever wonder how this bike got such grate efficiency?

img_5808_std.jpg


Here's the never b4 seen cutaway hind-view.
It reveals the dual-drive system that spurs-on the rider to maintain a steady rythym until reaching the peak (or climax, if you will) of the erupting volcano.



Well, it's been a slice guys.
I'm in diep-kimchi now.
I held out as long as I could, but I'm only human.
How could anyone pass-up on being handed such a perfect strate-line?
 

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Lately Turbo, I've noticed you haven't been hanging out here as much as in the past. Now we know why, Porno All-The-Day.

As a practical critique, the battery in that thing she's sitting on couldn't power the bike very far, but might create a potent motivation to pedal harder. Since you're obviously very interested in such things, I say you give it a try and report back to us. :)
 
Toorbough ULL-Zeveigh said:
Thanx to this forum enlightening me about eating horsecock a whole new universe has opened up.

Still not clear if it tastes better slightly seared or sautè in a white-wine sauce.
The french always know best.

C-ya!

Hey, what happened to your naked chickie-on-bike pic?
 
Lowell said:
She will just have to live on in your memory.

Damn! That's always happening to me....
 
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