This Video of a Motorized Spool Proves Me Right

Video needed more "As an electrical engineer, I'm overqualified for this!" But I'm once again convinced to join Team Mehdi!

Circuitmike

Steve Mould would've gotten away with it if it wasn't for Medhi and his meddling eyebrow.

ZTK

I'm curious what the effect looks like in a vacuum. Maybe the chain is moving easy through the wake of itself through the air, like an aeroplane.

James Heazlewood

Chain Siphon really, not a chain fountain. You're still right, Mehdi. You will always be right about this. The height of the arc is set by the maximum speed the chain reaches before it hits the ground... That speed determines the "jerk" on the top of the pile.

This is surely a key moment in the quest for anti-gravity!

FULL BRIDGE RECTIFIIAAA

That would be interesting. Also, he should use a small but flat surface that would not be facing up but something like a 45°, to check if the direction of the fountain is still straight up, or if it has any impact at all on the path.

It’s basic inertia - the rising chain has a certain velocity, by the time it changes direction from up to down it will have travelled some distance, just like if you threw a ball upwards. Also, assumption that chain will travel through whatever trajectory you give it is false. Steve’s chain on the floor seems to travel through those curves he made BECAUSE of friction, not despite it. The chain will try to reach its destination in the most energy-efficient manner. If you were to do this on a frictionless surface, it would collapse much faster. That’s why there’s a curve tractrix

The rod test is really interesting, maybe you can try it with something like a fishing line, that would really minimize any "leverage" happening

Allan Lindqvist

@12:30 I think I saw exactly what is going on. The chain rises because the length of chain going around the curve is added to the amount of the chain that is falling. But the entire chain is falling at a constant velocity, so the added length hast to go somewhere and the only “somewhere” to go is up.

so why did the chain at 2:14 raises above the floor? it looks like the force vector in this experiment is perpendicular to what we saw in other one's. It reminds me of gyroscope effect

Very cool! In the pipe experiment it looks like the chain gets a kick up when it reaches the portion resting on the pipe. Would a rig recording the forces on the pipe be too hard to set up/too low sensitivity to pick up the puny kick force?

I like this time of day! It's 10:00 am for me

I've watched this backwards... time to watch the first.... (:

nice it seems I am first one to comment

Hussam Aldean Mohammed Abbas