LightningRods mid drive kit

Discussions related to motors other than hub motors.
This includes R/C motors, botttom bracket, roller and geared drives.
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LightningRods
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Re: LightningRods mid drive kit

Post by LightningRods » Jan 08, 2018 3:49 pm

A. If I remember from when I was checking the Cyclone out to see if I was interested in it (I wasn’t) the planetary reduction is around 6:1. The primary stage of reduction on my standard mid drives ranges from 3:1 to 5:1 depending on which combination of sprockets or pulleys you use.

B. You can buy a Lightning Rods drive from me. PM me here, or go to my online store. lightning-rods10.mybigcommerce.com
Bullfrog wrote:
Jan 08, 2018 11:57 am

A. What is the overall reduction between the motor and the output shaft of the Lightning Rod Small Block and the Cyclone (if you know it)?

B. Where can I buy the lightning rod kits?
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Re: LightningRods mid drive kit

Post by LightningRods » Jan 08, 2018 4:02 pm

I really like belt drive, a lot, but there are limitations. Trying to get 8:1 reduction in one stage is really difficult with a belt. Getting big reduction in one stage requires a big difference between the driver and driven. This means teensy driver and huge driven. Small drivers have fewer teeth engaged in the belt and are more prone to skipping under load. Using a huge driven opens up the angle of the belt and disengages even more teeth. You can use idlers and other tricks to mitigate some of this but there is still a limit. Going to a coarse tooth pitch like an M8 to increase the torque capacity of the belt just aggravates the huge size of the driven pulley. An M8 pulley is more than 50% larger than an M5.

My personal dream swingarm drive is a two stage belt. 25mm wide M8 GT2 with a low 2:1 first stage and 4:1 second stage for 8:1 overall.

Motorcycles have more room in the frame and swingarm for belt drives because they don’t have to worry about clearing the swing arm with the crank swings or maintaining a Q-factor that won’t turn riders into bow legged cowboys.

I’m with the belt fans on clean, quiet operation, low maintenance and long life.
Powervelocity.com wrote:
Jan 08, 2018 1:25 pm
Making this a one stage belt drive would be perfect in my book, but I understand the challenges retrofitting a wider belt on existing frames. Keeping it very simple, with as few gears as possible.

A custom swingarm could be the way to go. Actually, a custom swingarm with a belt drive compatible with most frames is what I am thinking.
"I don’t mind that they stole my idea, I mind that they don’t have any of their own.”
-Nikola Tesla

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Powervelocity.com
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Re: LightningRods mid drive kit

Post by Powervelocity.com » Jan 08, 2018 7:42 pm

Yep, will have to ditch the pedals to accommodate the belt.

Gotta be a reason belts are used on gas-powered motorcycles with great success. Electric motors are not that much different from this perspective. Well, minus transmission. All we need is transfer the torque from the motor to the wheel and make sure to gear it in the way that it will spin in the most efficient RPM range at least 50% of the time (thinking cruising speed of 40 mph).

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Last edited by Powervelocity.com on Jan 09, 2018 11:41 am, edited 1 time in total.

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Re: LightningRods mid drive kit

Post by LightningRods » Jan 08, 2018 8:08 pm

That’s a pretty perfect illustration. In the case of the Zero S motorcycle the controller draws 550 amps and the final drive ratio is only 4.6:1. So massive torque and relatively little reduction. With a 28 tooth M8 driver the Zero’s belt can take a lot of power. That idler on the slack side improves the belt angle at the driver and engages more teeth.

Getting rid of the pedals and making it a motorcycle makes it easy. The frame and swingarm can be as wide as necessary.
"I don’t mind that they stole my idea, I mind that they don’t have any of their own.”
-Nikola Tesla

Lightning Rods Web Site http://www.lightningrodev.com
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