That’s assuming you hit something, if you slide out with no friction it’s equivalent to maybe a 10’ drop, possiblity less depending on stance (full tuck then roll sideways off the board is probably half that)
1 Like
with 4 motors of 220kv, 108a motor current, 49v, the motor torque at ~90mph, 2.41:1, 203.2 mm tires is 4.71nm
3 Likes
slide outs at 60mph I think its a pretty safe assumption your going to hit something unless you find a nice runway somewhere 
3 Likes
Its not the fall that kills you, its the sudden stopping at the end
10 Likes
^wind drag force ~100lbs @ 90mph… ~412a battery amps total between 4 motors at 49.4v… 108 motor current per motor and 103 battery current per motor
11 Likes
Yeah the force is real. My hand has felt this before.
a literal runway 
no curb, no cars, just grass runoff. (Don’t tumble in the grass, you’ll break limbs)
5 Likes
Is this calculated with a person fully standing up or in an aggressive tuck position?
1 Like
Internal potential losses in the battery are directly dependent on the current/(per cell) you push. The 18s battery will most likely have a lower P-count, so the current per battery will increase. Note that when starting, you rely on torque, and torque is directly proportional to current, not voltage.
The 18S battery will probably sag the same maybe even more, regardless of the inherent higher efficiency of 18S and better 40T cells.
3 Likes
Its other cells that have higher discharge so it will still be same discharge rate just higher voltage
1 Like
Lets see what results you get. Either-way Im excited to see what 18S ESC it will be 
1 Like
Yes! Will try step by step higher and we will se where it ends
4 Likes
Video or it didn’t happen
4 Likes
You’re right. It didn’t happen. Let’s see if it will.
No video => no more likes on @mackann’s future posts!
3 Likes
Oh no 
5 Likes
it’s 0.6m^2 frontal area and 0.75 drag coefficient which is loosely based on @MoeStooge ‘s reported power draw around 60mph
2 Likes
You should probably invest in some of those professional motorcycle race suit, where when they fall, the suit has an airbag built in to protect its driver.
Also would using bushings be dangerous at those speed? There is no risk that they just split under high loads?
1 Like
On 7" tire a single plastic spur tooth engages 72 times per second at 90mph.
If its not in an oil bath it will shed its lube. At 4.71 nm with plastics low tolerance for heat I cant see this going well for precision plastic helicals.
I do like the board and the spirit of what Bioboards is doing. A new speed record is well overdue.
6 Likes
This is so fuckin sick! Not a racer , but I love it so much.
Makes me feel good.
Thank you for that.
peace
3 Likes