Is grass a drag?

Lightweight / Folding / Portable EVs - seats optional

Is grass a drag?

Postby ArgusMcJohnsten » Thu Feb 09, 2017 1:18 pm

I really wasn't sure where to put this..

I'm wanting to build an offroad skateboard/scooter, will have 4 wheels but may incorporate steering, similar to a golf board. It's sole purpose will be extremely low speeds in parks and act as a golf cart for disc golf. I'm still very early in the design phase, but I'm trying to figure out if skateboard trucks and 10" all terrain wheels will be enough, or if the grass would cause a lot of drag and I should figure out an "axle-less" configuration. Such as a highly modified frame of this wagon As said earlier, this will be very low speed, but I'm concerned about the grass hitting the trucks lowering the range.

Please let me know your thoughts and thanks in advance.
Last edited by ArgusMcJohnsten on Thu Feb 09, 2017 1:20 pm, edited 1 time in total. View post history.
ArgusMcJohnsten
10 µW
10 µW
 
Posts: 6
Joined: Thu Feb 09, 2017 1:07 pm

Re: Is grass a drag?

Postby chuttney1 » Thu Feb 09, 2017 4:47 pm

Yes, it is a form of drag.
chuttney1
100 W
100 W
 
Posts: 247
Joined: Wed Apr 03, 2013 2:44 pm
Location: Los Angeles, CA

Re: Is grass a drag?

Postby liveforphysics » Thu Feb 09, 2017 4:49 pm

Grass is draggy depending on the height and other factors.

With 10in wheels and enough torque it should work fine.
Ebikes.ca

My bicycle completes the standing quarter mile in 11.502seconds at 110.56mph.

Giving my time to the electric revolution is done with pleasure. It is no longer fashionable to spit carcinogenic combustion by products in peoples faces as a part of sating daily transport.

Every post is in honor to the free idea exchange that Justin le preserved to grow with an amazingly high quality content in what is the living bleeding edge of LEV development.
User avatar
liveforphysics
100 GW
100 GW
 
Posts: 13980
Joined: Wed Oct 29, 2008 1:48 am
Location: Santa Cruz, CA, USA

Re: Is grass a drag?

Postby spinningmagnets » Fri Feb 10, 2017 1:48 pm

If it's a large and slow powerboard, consider using a single hubmotor in the rear, to make it a tadpole trike. Maybe a 16 - inch Magic-Pie?
User avatar
spinningmagnets
100 GW
100 GW
 
Posts: 9998
Joined: Fri Dec 21, 2007 10:27 pm
Location: Ft Riley, NE Kansas

Re: Is grass a drag?

Postby ArgusMcJohnsten » Sat Feb 11, 2017 10:09 am

Thanks guys. I really can't figure out which way to go. Trucks would be the easiest mounting, would give a bit of suspension, but may not be as efficient depending on how long the grass is. The "axle-less" (don't know what else to call it) would probably be cheaper, less drag, but a bumpier ride, higher center of gravity.

As for the magic pie, it would be more expensive, and I like the idea of changeable gear ratios using brushless motors and belt drives. The tadpole configuration is intriguing..it would make for one less contact patch, but would make another track of grass to be compressed as I'm riding. It would be a little less weight, but would be a little less stable.

Sometimes I think it would be good if I didn't overthink so much.
ArgusMcJohnsten
10 µW
10 µW
 
Posts: 6
Joined: Thu Feb 09, 2017 1:07 pm

Re: Is grass a drag?

Postby kneedeep » Sat Feb 11, 2017 10:22 am

I have that wagon for yard work and it hold a lot of weight but the plastic body is the frame its a wet noodle basically.
Chinese Ebay build in progress viewtopic.php?f=12&t=86149 , been through half a dozen scooter ebikes..No More of those.

I like to build it better than I can buy it. I like to think outside the box...Come to think of it where is that box?
User avatar
kneedeep
100 W
100 W
 
Posts: 122
Joined: Tue Jan 24, 2017 1:59 am
Location: Ontario Canada

Re: Is grass a drag?

Postby ArgusMcJohnsten » Sat Feb 11, 2017 10:36 am

I was just using it as an example of where my mind wandered to to get the most ground clearance, but thank you.
ArgusMcJohnsten
10 µW
10 µW
 
Posts: 6
Joined: Thu Feb 09, 2017 1:07 pm

Re: Is grass a drag?

Postby Nordle » Sat Feb 11, 2017 12:25 pm

:pancake: it's not a drug :mrgreen:
4:20 Noob Hubz! BLAZE it
..sry for dat poor english..
User avatar
Nordle
100 W
100 W
 
Posts: 190
Joined: Mon Jul 20, 2015 1:42 pm
Location: The Alps

Re: Is grass a drag?

Postby Okami » Sun Feb 12, 2017 12:27 pm

Check ''wacky boards'' website.. just search on google for it.. Im sure you will find lots of crazy ideas to properl your imagination further..
Okami
100 mW
100 mW
 
Posts: 42
Joined: Thu Jun 02, 2016 3:00 am

Re: Is grass a drag?

Postby StephensEngineering » Mon Feb 13, 2017 11:16 pm

For something very slow and for off-road only I may suggest looking for some durable small tank treads, I bet you could find something, Then incorporate a leaning system like the Swagway boards to adjust which side moves faster during leaning
StephensEngineering
1 µW
1 µW
 
Posts: 3
Joined: Sat Feb 11, 2017 11:33 am

Re: Is grass a drag?

Postby ArgusMcJohnsten » Tue Feb 14, 2017 7:08 am

Played around in sketchup and came up with this as a very rough design. Razor scooter front end for steering, the boxes with the colors in them are the golf disc holders.
Attachments
Capture2.PNG
ArgusMcJohnsten
10 µW
10 µW
 
Posts: 6
Joined: Thu Feb 09, 2017 1:07 pm

Re: Is grass a drag?

Postby Flexscoot » Fri Feb 17, 2017 2:26 am

except if the grass is very deep, you should be fine with 10"wheels (large part of the drag of grass comes from the softness of the grass roots where smaller wheels (like 8" mtb wheels) "punctures" and causes drag )...

If you plan to ride it in seated position, that mean that your weight will be mainly on the aft wheels... in this case a delta 3 wheels could be almost as stable as a 4 wheelers and you will have the benefit of a simple and efficient steering
Flexscoot
10 W
10 W
 
Posts: 68
Joined: Thu Jun 27, 2013 4:34 am

Re: Is grass a drag?

Postby ArgusMcJohnsten » Sat Feb 18, 2017 8:46 am

Thanx FlexScoot. I'll probably be sitting about 50-75% percent of the time.
ArgusMcJohnsten
10 µW
10 µW
 
Posts: 6
Joined: Thu Feb 09, 2017 1:07 pm

Re: Is grass a drag?

Postby ecycler » Mon Mar 13, 2017 2:12 pm

Couple of thoughts:

1. In the right conditions (dry, short, and consistent turf) I am able to easily ride my dual diagonal longboard with 90mm wheels over grass. It has 4+kw which is beyond more than enough power, but I would not do it on a nice lawn. The wheels act kind of like mini steam rollers!
2. Make sure to get as wide and soft of tires as possible. It makes a big difference with floatation and impacting the turf the least. Your tenure of using it will be quite short if it leaves tracks and damage.
3. Your sketchup has way too short of a wheel base, unless you like racking yourself on the handlebar stem. Consider using a snowboard as the deck and reinforcing it with a frame underneath. That will likely give you a light and durable platform.
4. You can probably borrow some parts from an old california go-ped to make the build easier... things like folding handlebars are nice for transporting.
Any grease is better than no grease.
The best exercises are the ones you enjoy doing.
I strongly prefer vehicles without doors.
ecycler
10 kW
10 kW
 
Posts: 825
Joined: Thu Apr 03, 2014 9:30 pm
Location: USA

Re: Is grass a drag?

Postby ArgusMcJohnsten » Tue Mar 14, 2017 11:12 am

1. The more I think about it, I probably won't need that high of frame clearance, as said, the tires will be the main contact points anyway.

2. I plan on going with garden cart, tires for testing (whenever that finally happens [darn homeowner expenses]) as they're cheap and easy to find

3. I take more a "spit it out" approach to designs and get a basic idea and make changes once I see it in person. That design is 40" wheel base, but the angle probably makes it look a little different. The handlebar stem I just took a guess on, hoping for a height that works sitting or standing. So it's probably too tall, also making the dimensions seem off.

4. I don't have a welder, so a lot of the parts will be salvaged from other items. In the sketchup, I used a razor scooter folding stem, that way I didn't have to model something from scratch. I do like the California GoPed fold design a lot better though.
ArgusMcJohnsten
10 µW
10 µW
 
Posts: 6
Joined: Thu Feb 09, 2017 1:07 pm

Re: Is grass a drag?

Postby ecycler » Tue Mar 14, 2017 12:46 pm

From my younger years I will vouch that goped bars can hold up to some serious, serious abuse!
Any grease is better than no grease.
The best exercises are the ones you enjoy doing.
I strongly prefer vehicles without doors.
ecycler
10 kW
10 kW
 
Posts: 825
Joined: Thu Apr 03, 2014 9:30 pm
Location: USA

Re: Is grass a drag?

Postby Flexscoot » Tue Mar 14, 2017 12:58 pm

40" wheelbase is similar to my flexscoots so it should be ok. However, it depends upon the height of your seat, ie fully seated position or semi-seated position, as the second takes less space and is also more stable.
Flexscoot
10 W
10 W
 
Posts: 68
Joined: Thu Jun 27, 2013 4:34 am


Return to Stand-up E-scooters and E-skateboards

Who is online

Users browsing this forum: No registered users and 6 guests