Noticed quicker acceleration while holding water bottle?

[jack.luis]

Using my motors?

[SquishyCat]

jet engine, duh

[fessyfoo]

@ross_forp

now lean to your maximum & then add a counterweight, what happens?

that’s not more acceleration until you hit the limit that you are at max lean.

@fessyfoo

may mean you can absorb more force with less lean and therefore perhaps max lean can balance greater thrust? but you’d also loose some acceleration to having to accelerate more mass… hmm.

so for the same input force, ie what our boards can give us now. that we can already balance without a water bottle. you don’t get more acceleration you get less due to increased mass.

[ross_forp]

All i’m saying is in a 1/4mile drag race, a counterweight would likely be an advantage…

[rosco]

Is that why these drag racers are long?

[ross_forp]

https://www.summitracing.com/parts/hsd-c-014e

[jack.luis]

Is this another solution looking for a problem?

[tuckjohn]

@ross_forp

@fessyfoo

I’m not sure you can actually ignore the center of mass moving.

I havent ignored it…

@ross_forp

If you over simplify the problem by ignoring that the center of mass moves forward

Huh

[ross_forp]

@tuckjohn

Huh

I ignored it in my verbal explanation, not the mathematical one

90kg Counterweight:
Center of Mass
((90 * 0)+(100 * 1))/(90+100) = 0.5263m
^Center of mass is 0.5263m from Counterweight
Torque from counterweight:
90kg * 9.8m/s^2 * 0.5263m = 464.19Nm torque from counterweight
Force from car:
464.19Nm / 0.5m = 928.38 N force from car
Acceleration from force & mass:
928.38N / (90kg + 100kg) = 4.8862m/s^2acceleration

100kg Counterweight:
Center of Mass
((100 * 0)+(100 * 1))/(100+100) = 0.5m
^Center of mass is 0.5m from Counterweight
Torque from counterweight:
100kg * 9.8m/s^2 * 0.5m = 490Nm torque from counterweight
Force from car:
490Nm / 0.5m = 980 N force from car
Acceleration from force & mass:
980N / (100kg + 100kg) = 4.9m/s^2 acceleration

110kg Counterweight:
Center of Mass
((110 * 0)+(100 * 1))/(110+100) = 0.476m
^Center of mass is 0.476m from Counterweight
Torque from counterweight:
110kg * 9.8m/s^2 * 0.476m = 513.128Nm torque from counterweight
Force from car:
513.128Nm / 0.5m = 1026.25 N force from car
Acceleration from force & mass:
1026.25N / (110kg + 100kg) = 4.88m/s^2acceleration

[jack.luis]

GPT4 is really impressive wow

[rosco]

Can you please explain what you are going on about in plain English.

20 word limit

[ross_forp]

@rosco

Can you please explain what you are going on about in plain English.

20 word limit

When you’ve reached your lean limit, apply more thrust by using a counterweight. More acceleration.

[rosco]

@ross_forp

More acceleration

Push thumb wheel with thumb

[jack.luis]

@ross_forp

apply more thrust by using a counterweight

I don’t understand how a counterweight adds thrust, what is it pushing against?

[rosco]

Who is reaching their lean limit?

[ross_forp]

@jack.luis

I don’t understand how a counterweight adds thrust, what is it pushing against?

The force from the board is off axis with your center of mass. This generates a backwards tilting torque. Adding a forward ballast mass counteracts this torque.

[jack.luis]

[rosco]

@Flyboy’s leg throttle would be good for this discussion. Lean forward board goes faster

[tuckjohn]

I think @ross_forp’s point is that if you’re falling off the back of your board, adding a counterweight to the front will prevent this?

However, he neglects that falling off the back of the board isn’t a problem any of us have(and thus isn’t a limitation)

[jack.luis]

@ross_forp

backwards tilting torque

Around what axis does this torque apply?