Radislav

Ninebot One E+ at -25°C

35 posts in this topic

3 hours ago, Radislav said:

How long it will go when it's freezing cold outside.

The Ninebot performed great! I noticed you are very skillful in jumping up and down curbs! I was very impressed with how smoothly the Ninebot traveled on the areas that had some snow. I have not been successful on surfaces that have snow on them. Sooner or later my wheel hits ice under the snow and slips.

1

Share this post


Link to post
Share on other sites

A very well made video!!! Almost poetic:D Winter and snow riding has a special quality. And you have quite some skills. Nice app tips too.

Qs:

What kind of helmet is this? And how did your feet not freeze? And your legs, you wear anything under the jeans other than knee pads?

Did you ever ride on a frozen river/lake? I would do that in an instant if I could.

Do you worry about road salt, is that a thing to consider?

0

Share this post


Link to post
Share on other sites

Thank you, guys! :)

9b1 exceeded my expectations in deed. I thought it would go 10 km max in -25°C. 

Moscow authorities use quite an advanced anti-ice chemistry on the roads and pavements. That's why it's not slippery here in winter. Nevertheless we drive carefully leaning the body less.

I am trying to keep my Ninebot clean inside by washing it in a bathroom twice a week with strong and warm jet of water into the gap between the chassis and the wheel to prevent the salt to do any harm to the wheel.

I have thermo protection underwear made for alpine skiing. 2 pairs of thick socks too. So I don't feel cold too much. In most cases, the temperature in Moscow in winter is 0...-15°C. The pleasure of riding a unicycle worths that a lot! :)

I am an ex pro speed skater. That's why I am not afraid to jump out on a flat ice. As to EUC, it looses grip on a clean and flat ice only. If an ice is not that perfect, a unicycle behaves well and slips much less than a human foot. I explain it to myself by the fact that specific pressure of the wheel down to the surface is much higher in this case, especially when you lower a tyre pressure a bit.

Edited by Radislav
2

Share this post


Link to post
Share on other sites
4 hours ago, Radislav said:

I explain it to myself by the fact that specific pressure of the wheel down to the surface is much higher in this case, especially when you lower a tyre pressure a bit.

Lower tyre pressure means however lower specific pressure on the surface, not higher specific pressure. In any case, adhesion is in general considered to be independent of the size of the contact patch! It mainly depends on the down force and the involved materials. Why is walking more slippery? Taking steps during walking involves lateral forces which is how friction can be lost. Tyre rubber may also be superior to sole rubber. Lowering the tyre pressure has probably the advantage to lead to less compression and to less shoving of the snow.

0

Share this post


Link to post
Share on other sites

Yes, that's right. When considering that the contact spot of the (even down-pressured to 2 atm) wheel is nearly twice as narrower as a foot - the down force is twice as much for the wheel. Plus we have all the body weight on this single spot instead of two spots for two legs - this gives the wheel a result of 4 times stronger down force than a foot. Plus better rubber grip. Conclusion: electric unicycle is the safest vehicle on the planet :)))) It should definitely help to sell them.

2

Share this post


Link to post
Share on other sites
6 hours ago, Radislav said:

Yes, that's right. When considering that the contact spot of the (even down-pressured to 2 atm) wheel is nearly twice as narrower as a foot - the down force is twice as much for the wheel. Plus we have all the body weight on this single spot instead of two spots for two legs - this gives the wheel a result of 4 times stronger down force than a foot.

Not really, sorry for the bad news. The down force is the same, independently of how large the contact patch is. We do not talk about the pressure which depends on the patch size, we talk about the force which is pretty much equivalent to weight here. Weight does not dependent on what we stand on. So decreasing (or increasing) the contact patch size doesn't help. Increasing the weight also does not help. While it increases adhesion it also increases the moments we want/need to control with the adhesion.

0

Share this post


Link to post
Share on other sites

Pounds per square inch is much higher. Full body on 2 square inches or full body on 20 square inches. 

0

Share this post


Link to post
Share on other sites

Sure, that is the definition of pressure. But pressure is not the determining factor for adhesion or friction. Determining is pressure times area, which is pounds per square inch times square inch, which is pounds.

If we could increase friction by making the contact patch size smaller, formula one car tyres would certainly look entirely different.

0

Share this post


Link to post
Share on other sites

Theory can be various but in reality everyone of us noticed that the road suddenly becomes much more slippery than it seemed after we stepped down from a unicycle.

Edited by Radislav
0

Share this post


Link to post
Share on other sites

@Radislav, I never wanted to suggest that your observation is wrong, I only suggested that we would need a different explanation, one which does not contradict widely accepted physical models (and I suggested two possible explanations which, AFAICS, do not contradict known physics).

Edited by Mono
0

Share this post


Link to post
Share on other sites

Well that was fun.  I really liked the poem towards the end, very funny.  Well done.

1

Share this post


Link to post
Share on other sites

The louder we laugh the longer we live :)  I'm thinking about a heating system for the battery to improve its results in winter.

0

Share this post


Link to post
Share on other sites

If you bought a set of those larger side panels from @1RadWerkstatt, there would be enough room next to the battery to plop in a chemical hand warmer pack or maybe one of those butane hand warmers.

https://www.mec.ca/en/product/5014-829/Hand-Warmer

I don't know how safe that would be with the butane burning inside an enclosure, but maybe with some venting slots cut into the side panels it might be okay?  

There are also those reuseable warmers (snap the metal disc to activate / boil to melt the crystals to reuse) that last for about an hour.  That might be the simplest solution, but you would still need some room to sandwich them around the battery.

https://www.amazon.com/ReDo-Reusable-Warmer-Emergency-Zone/dp/B01HOXM0OE

 

1

Share this post


Link to post
Share on other sites

Hi, does the behavior of the wheel change by theses temperatures ? I mean do the pedal lean a little more forward than usual for example ?

0

Share this post


Link to post
Share on other sites

ILYA2606 on the Ninebot App , is from Moscow . Recently ranked 36 in total miles.

They rolled big miles and mono biathlon awhile ago.

img_1487976162580.jpg

Screenshot_2017-02-24-17-43-36.png

1

Share this post


Link to post
Share on other sites
21 hours ago, Pingouin said:

Hi, does the behavior of the wheel change by these temperatures ?

Hi! The wheel's behavior didn't change at all. I found absolutely no difference since the summertime. 

0

Share this post


Link to post
Share on other sites
10 hours ago, Bob Eisenman said:

ILYA2606 on the Ninebot App , is from Moscow . Recently ranked 36 in total miles.

They rolled big miles and mono biathlon awhile ago.

img_1487976162580.jpg

 

EUC with friends, nice!

EUCs with friends and pretty girls, wonderful!

EUCs with friends and pretty girls, and semi auto pistols and high capacity machine pistols, priceless! 😳

Edited by Smoother
2

Share this post


Link to post
Share on other sites
On 24.02.2017 at 5:18 AM, Hunka Hunka Burning Love said:

If you bought a set of those larger side panels from @1RadWerkstatt, there would be enough room next to the battery...

I've been thinking of buying his 704 Wh battery extension kit. I even artificially enlarged the side cushions to try them on my shins. It felt comfortable but the price didn't :)  considering that my Ninebot will not ride faster afterwards anyway. 

I think the stock cushions have enough space to accommodate electric insoles stuck to the battery to keep it warm. The energy they take of the Ninebot's battery should be much less than the energy the battery looses when it's freezing cold outside. I will write here when it's done, I think it will be interesting mod because not everyone rides in California.

1

Share this post


Link to post
Share on other sites
11 hours ago, Bob Eisenman said:

ILYA2606 on the Ninebot App , is from Moscow . Recently ranked 36 in total miles.

 

Yes, that's him. His Ninebot One has nearly 4000 total mileage that can be seen in the rating in Ninebot official app. 

His DarknessBot app is available on the Apple AppStore now. The version 1.0 supports Ninebot EUCs except A1/S2. Version 1.1 exists in beta status now adding read-only support for Inmotions, GotWay's and Kingsongs. 

0

Share this post


Link to post
Share on other sites
On 2/12/2017 at 8:49 PM, Radislav said:

How long it will go when it's freezing cold outside.

The Moscow State University webcam has been available for viewing for years. A quick look a few minutes ago shows snow still on the ground, looking toward the river from the tower.

Locally in the Boston, Massachusetts area a spring like heat wave has lifted temperatures to the 50's F (or 11 C).

http://cam.mnc.ru

My phone is Android so the app isn't available.

Nice video !

 

Screenshot_2017-02-25-10-14-55.png

1

Share this post


Link to post
Share on other sites
16 minutes ago, Bob Eisenman said:

The Moscow State University webcam has been available for viewing for years. A quick look a few minutes ago shows snow still on the ground, looking toward the river from the tower.

Locally in the Boston, Massachusetts area a spring like heat wave has lifted temperatures to the 50's F (or 11 C).

http://cam.mnc.ru

My phone is Android so the app isn't available.

Nice video !

Thanks :) Moscow weather gives us no heat waves yet. The temperature dropped from 0 to -5°C after 2 days of wet snow making all the pavements extremely icy. Nevertheless a few brave unicyclers went for a group ride today, some of them on spikes, to show to the weather who is the boss :) 

1

Share this post


Link to post
Share on other sites

About 2001 I found a bunch of sketches on a Russian Academy of Sciences website. This one looks appropriate. 

О 2001 я нашел кучу эскизов на русском академии наук сайте. Это выглядит целесообразным.

 

winter_evning_full.jpg

0

Share this post


Link to post
Share on other sites

"Dormitory. Winter evening"

Things got much better since then :) 

0

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now