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dimes

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- TL;DR Summary
- How does the speed of the wheel and size of the ball affect the variance of results in roulette?

Hi all,

I've been a roulette player for more than 10 years (although I took time off here and there) and it's only now that I'm trying to understand the physics of the game. Basically my strategy in roulette is to divide the wheel roughly into two halves (let's call them A and B). My theory is that in roulette there will invariably be variance. In other words, if A comes up 5 times in a row, B will be due to come up soon.

However I have been proven wrong many times, and I have seen some unbelievable results where the ball can land in A 10-15 times in a row. Now that brings me to the question of why?

The ball is manually flicked by a dealer, so there is force and velocity. The wheel is also spun by the dealer - sometimes fast and sometimes slow. The dealer can also choose to use a small or big ball.

Now if the ball lands in A 10 times in a row, is the dealer doing something specific to get the ball to land there? That is, have they fallen into some routine or pattern? How many spins will it take to show the dealer has fallen into such a pattern? 10 spins? 20 spins? 30 spins?

This brings me to the real question: in which scenario would more variance be created? By variance I mean the ball landing in A and B relatively equally, as opposed to it landing in one half 10 times in a row.

1. Wheel is spun slow and the ball is heavy

2. Wheel is spun fast and the ball is heavy

3. Wheel is spun slow and the ball is light

4. Wheel is spun fast and the ball is light

My thinking is that if the wheel was NOT moving at all, it would be easier to train a dealer to hit A or B intentionally. The difficulty of this gets harder once the wheel is spun, and then of course the difficulty gets increasingly harder as the wheel is spun even faster.

I'm keen to hear people's thoughts on this, and please feel free to correct any assumptions I have made.

PS. And yes, I know the casino odds, but here I am only interested in the physics of the roulette wheel and what difference the various factors can make.

I've been a roulette player for more than 10 years (although I took time off here and there) and it's only now that I'm trying to understand the physics of the game. Basically my strategy in roulette is to divide the wheel roughly into two halves (let's call them A and B). My theory is that in roulette there will invariably be variance. In other words, if A comes up 5 times in a row, B will be due to come up soon.

However I have been proven wrong many times, and I have seen some unbelievable results where the ball can land in A 10-15 times in a row. Now that brings me to the question of why?

The ball is manually flicked by a dealer, so there is force and velocity. The wheel is also spun by the dealer - sometimes fast and sometimes slow. The dealer can also choose to use a small or big ball.

Now if the ball lands in A 10 times in a row, is the dealer doing something specific to get the ball to land there? That is, have they fallen into some routine or pattern? How many spins will it take to show the dealer has fallen into such a pattern? 10 spins? 20 spins? 30 spins?

This brings me to the real question: in which scenario would more variance be created? By variance I mean the ball landing in A and B relatively equally, as opposed to it landing in one half 10 times in a row.

1. Wheel is spun slow and the ball is heavy

2. Wheel is spun fast and the ball is heavy

3. Wheel is spun slow and the ball is light

4. Wheel is spun fast and the ball is light

My thinking is that if the wheel was NOT moving at all, it would be easier to train a dealer to hit A or B intentionally. The difficulty of this gets harder once the wheel is spun, and then of course the difficulty gets increasingly harder as the wheel is spun even faster.

I'm keen to hear people's thoughts on this, and please feel free to correct any assumptions I have made.

PS. And yes, I know the casino odds, but here I am only interested in the physics of the roulette wheel and what difference the various factors can make.