1900g motor, only 103mm x 85mm
- Thread starter Lowell
- Start date
Malcolm
10 kW
Nice! You'll need to maintain a speed of 100 kph just to keep that little powerhouse cool!
TylerDurden
100 GW
Wieviel geld costet das motor?
500eu? Mehr?
500eu? Mehr?
TylerDurden
100 GW
Miles said:
Ouch. The ETEK's a bargain by comparison.
But, if you want small...
That would make a helluva pocketbike.
8)
Malcolm
10 kW
Was wondering the same myself. Couldn't find any efficiency figures for this motor.
Got me thinking about cooling and I realized I know very little about the efficiency of different cooling methods. For instance, if you fit an effective blower fan to a motor like this, how many watts of heat can you dissipate per watt of power input to the fan? I know it depends on the temperature difference, but I couldn't even guess at a ballpark figure for say a 50C temperature difference. Can anyone point me in the right direction?
Not sure about cooling fans, but I would use ambient airflow to start with, and then increase heat sink surface area until the motor temperature was what I wanted. A fan directly on the output shaft could augment low speed cooling.
Miles said:Lowell said:
Not sure I'd call hanging off the side of the bike nice packaging
True, but it sure beats an Etek on the side of the rear wheel! I was thinking it would fit better inside the rear triangle.
Having the motor unsprung would be nice, but adds complexity. If you look at the Blade, they use a belt drive to a jack shaft, and then chain drive off that so the rear suspension will pivot properly.
http://www.electricmoto.com/gallery.php?gallery=1&reference=gallery_blade#
Lowell said:
Yes, I like that arrangement. With a Kv of 160, you'll need a jackshaft....
Also, see the Jackelope set-up - slightly simpler.
Randy's system - mounting as close to the pivot as possible - is a reasonable compromise, though....
Even at 60mph, that motor wouldn't even break a sweat, and 60mph of air ducted through it should easily dispose of the 350-400w of waste heat.
The only question would be whether the motor makes enough low RPM torque to flick the front wheel up at will anytime with 9:72 gearing. 8)
The only question would be whether the motor makes enough low RPM torque to flick the front wheel up at will anytime with 9:72 gearing. 8)
Lowell said:
In that case, it's a question of what efficiency you get at 3/4 of peak efficiency rpm.... bearing in mind the reduced heat dissipation at the slower speed....
At 70% efficiency, you'd have a 1350Watt heater, right?
Malcolm
10 kW
Call me a wimp if you like, but 60 mph sounds pretty hairy on a mountain bike frame – or are you planning to build a special frame for this one Lowell?
It might work, but it will sound like a vacuum cleaner.
For air cooling, a 10w blower can probably dissipate 1000w of heat with good flow.
For air cooling, a 10w blower can probably dissipate 1000w of heat with good flow.
safe
1 GW
- Joined
- Dec 22, 2006
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- 5,681
6000 rpm is tough to manage.
Go cart rear sprockets can run as large as 114 teeth and use the #35 chain which is strong enough for some pretty significant power. (at least 5 hp if not more) Front sprocket of 11 is about as small as you want to go before your efficiency drops due to friction. So you get:
6000 * 11 / 114 = 579 rpms which is somewhere near 45 mph or so. (which means you could use an even larger front sprocket or have three or four gears to experiment with... 11, 12, 13, 14)
It definitely looks possible...
Go cart rear sprockets can run as large as 114 teeth and use the #35 chain which is strong enough for some pretty significant power. (at least 5 hp if not more) Front sprocket of 11 is about as small as you want to go before your efficiency drops due to friction. So you get:
6000 * 11 / 114 = 579 rpms which is somewhere near 45 mph or so. (which means you could use an even larger front sprocket or have three or four gears to experiment with... 11, 12, 13, 14)
It definitely looks possible...
patrick_mahoney
100 W
I vote you use the motor the way it's supposed to be used: put a propeller on it and mount it to the front of your bike.
Now before you point out how silly this idea is, give it some thought. No more problems with air cooling - no matter the grade. No more concerns about gearing. And it won't sound like a vacuum cleaner - it would sound more like a Cessna. It would be unique...
Ok, it's a silly idea.
Now before you point out how silly this idea is, give it some thought. No more problems with air cooling - no matter the grade. No more concerns about gearing. And it won't sound like a vacuum cleaner - it would sound more like a Cessna. It would be unique...
Ok, it's a silly idea.
TylerDurden
100 GW
patrick_mahoney said:
What the hell... I can take it all the way to stoopid.
Ditch the bike, keep the prop, put handles on the motor and use it like a sea-scooter with yer rollerblades.
Roadrunner is mine.
