Submitted 2 months ago by Alphane_Moon@lemmy.world to energy@slrpnk.net
https://newatlas.com/motorcycles/yongle-risheng-cg-wind-solar-motorcycle/
Sorry can someone explain how the turbines work? Is the turbine pulling the motorbike forward or is it there to generate power?
The bike has an electric motor so the turbine seems unnecessary. But if the motor is pulling it forward then it’s fighting the turbine so it’s wasting energy (it’s not some perpetual motion device).
Are the solar and turbines there so you park up and the bike charges while you’re shopping?
I just can’t understand why the addition of turbines is helpful here.
you can actually gain energy while moving upwind, it’s counterintuitive but the existence of tacking in sailing (doing a zig-zag upwind) makes it a bit easier to internalize for me.
That’s a little bit different.
In your case, the wind is blowing and the craft is getting energy from it.
I was referring to the energy coming from the motor pushing you through the air and then trying to claim some energy from the wind you created by pushing yourself through the air with the motor.
If there is wind blowing you could in theory get some energy from it, but the thing about sailboats is there is a constant need to adjust the sail when you turn. A turbine on the front isn’t going to be angled correctly whichever direction you turn.
But I think I worked out the reason for the turbine. It’s powered by the battery (it’s not intended to charge the battery) and I think is there to pull the top of the contraption forward so it doesn’t fall over when accelerating.
so you can ride at night
But it doesn’t help. If you are travelling forward under the force of the motor using the electricity, then using the wind from that forward motion to generate electricity with the turbine will produce less electricity than the extra energy needed to propel you forward when you have a turbine on the top creating air resistance. If you could use a motor to travel forward and use a wind turbine to capture energy from that motion in a way that produces more power than you put in, well that would be a source of infinite energy. It violates the law of conservation of energy.
The only thing I can think of is that it generates electricity when you are not moving. But considering the size of it, I can’t imagine it’s worth it to generate that tiny amount of electricity when stopped to then have that increased drag when moving causing you to use more power.
Coming soon to FortNite?
RedSnt@feddit.dk 2 months ago
This is the kind of silly design I was thinking of 25 years ago as I was cursing the headwind on the bikepath on my way home. Not the solar panel roof, but the windmill.
Doesn’t it generate too much drag to be of any use?
keepthepace@slrpnk.net 2 months ago
Yeah the turbine on top does not make sense while driving. It could be something used while it is parked.
Yes, there are contraptions that can extract energy from downwind or upwind vehicles. This is not one of those. On any decent road speed that thing will drag like hell.
Dave@lemmy.nz 2 months ago
I think I’ve worked it out, after some discussion in another comment thread.
This contraption probably has a high centre of gravity and would tip over backwards if you accelerate too fast. They probably worked out a wind turbine on the top spreads the acceleration force and reduces this problem. The turbine is not for generating power, it has a motor and is used to give some thrust to the top.
perestroika@slrpnk.net 2 months ago
I would think the drag is considerable.
I would also worry about stability in a strong side wind.
As a result, I would not like to ride the 2-wheeled version in strong side wind. The 3-wheeled version looks OK, but also suffers from drag.
Besides, to generate power from wind while parking, you would have to choose your parking direction. But you can’t always choose the parking direction - location dictates it often. That kind of a wind generator on a vehicle looks severely half-assed. They should have though two steps ahead.
Swedneck@discuss.tchncs.de 2 months ago
you can gain energy while moving upwind, it makes more sense if you think about how boats can do a zig-zag to sail upwind (tacking).
www.youtube.com/watch?v=u5InZ6iknUM
RedSnt@feddit.dk 2 months ago
Although the video they refer to in your link is about going faster than the wind in the direction of the wind, there is a cool explanation about tacking in it. Both great videos btw.