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Unread 13-01-2017, 00:19
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Re: Realistic high goal scoring rate

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At 25 ft/s, that's about 12 lbs of thrust. I don't think you'll be going to space today with that engine.
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Unread 13-01-2017, 01:03
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Re: Realistic high goal scoring rate

Anybody tested the amount of bounce the balls have against the entrance?
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Unread 13-01-2017, 10:25
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Re: Realistic high goal scoring rate

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Originally Posted by Kevin Sevcik View Post
How fast is the ball traveling at the apex of your trajectory? The slowest speed on your trajectory is what you should use with pitch to calculate balls per second.
The model is simple and does not calculate the influence of any drag or lift based on ball spin. In terms of rate, I use the muzzle velocity and pitch as representative of the rate of the balls leaving the shooter. Assuming all balls will have the same velocity profile and land in the Boiler, then what goes out of the shooter at a specific rate gets scored at the same rate. Right?

And yes, the feed rate to the shooter is the rate limiting step. Recognize, too, that feeding multiple balls to a multiple-ball wide shooter will increase the discharge rate. It may also create in-flight interactions which could reduce efficiency of scoring.
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Unread 13-01-2017, 10:35
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Re: Realistic high goal scoring rate

I'm thinking the best teams will be around 10 balls/second. During our Ri3D Testing, we were around 1.25 balls/second. This was only with 1 shooter on our robot, and a fairly unaggressive agitator. I imagine some teams will have three or more shooters on their robot and very aggressive agitators.

We're going to be seeing some robot machine guns out there... this game is going to be a fun one.
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Unread 13-01-2017, 10:37
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Re: Realistic high goal scoring rate

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Originally Posted by rick.oliver View Post
The model is simple and does not calculate the influence of any drag or lift based on ball spin. In terms of rate, I use the muzzle velocity and pitch as representative of the rate of the balls leaving the shooter. Assuming all balls will have the same velocity profile and land in the Boiler, then what goes out of the shooter at a specific rate gets scored at the same rate. Right?

And yes, the feed rate to the shooter is the rate limiting step. Recognize, too, that feeding multiple balls to a multiple-ball wide shooter will increase the discharge rate. It may also create in-flight interactions which could reduce efficiency of scoring.
Those balls aren't traveling at a constant speed, even without drag. If you shoot a ball straight up, it doesn't keep going at the same speed, gravity slows it down. Vertical speed drops to 0 at the top of the arc. At the top of the arc, the balls are closer together because they only have the horizontal component of velocity left. At 86 degrees, you don't have much horizontal component. Specifically, 15 in/s. So you can only shoot 3 per second in a straight line without a traffic jam in mid air. There, I checked your math for you.
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Unread 13-01-2017, 10:39
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Re: Realistic high goal scoring rate

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Originally Posted by Kevin Sevcik View Post
Those balls aren't traveling at a constant speed, even without drag. If you shoot a ball straight up, it doesn't keep going at the same speed, gravity slows it down. Vertical speed drops to 0 at the top of the arc. At the top of the arc, the balls are closer together because they only have the horizontal component of velocity left. At 86 degrees, you don't have much horizontal component. Specifically, 15 in/s. So you can only shoot 3 per second in a straight line without a traffic jam in mid air. There, I checked your math for you.
and this is why I'm hoping most shooters are shooting NOT from the front of the boiler, but instead further back
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Unread 13-01-2017, 10:42
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Re: Realistic high goal scoring rate

I would take a bet and say 3 balls a second will be the average scoring rate. Just a thought though.
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Unread 13-01-2017, 12:59
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Re: Realistic high goal scoring rate

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Originally Posted by Daniel_LaFleur View Post
and this is why I'm hoping most shooters are shooting NOT from the front of the boiler, but instead further back
Point blank shooters need to be 2 or 3 wide to make any sense, honestly.
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Unread 13-01-2017, 13:05
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Re: Realistic high goal scoring rate

I'll take 3 accurate bps over a spray and pray any day.
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Unread 13-01-2017, 13:14
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Re: Realistic high goal scoring rate

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I'll take 3 accurate bps over a spray and pray any day.
In this game, I don't know. If you're shooting at 3 bps, it takes you 16 seconds to shoot a Hopper's worth of balls for 16 points. If you shoot at 10 bps at 50% accuracy, you take 5 seconds to shoot a Hopper's worth of balls for 25 balls or 8 points in 5 seconds. It obviously depends on the accuracy and the shooting rate, but I'd take the second robot in this case.
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Unread 13-01-2017, 13:37
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Re: Realistic high goal scoring rate

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In this game, I don't know. If you're shooting at 3 bps, it takes you 16 seconds to shoot a Hopper's worth of balls for 16 points. If you shoot at 10 bps at 50% accuracy, you take 5 seconds to shoot a Hopper's worth of balls for 25 balls or 8 points in 5 seconds. It obviously depends on the accuracy and the shooting rate, but I'd take the second robot in this case.
especially with a fast ground pickup. Shoot two hoppers of balls, pickup your misses for cycle 3.

I think really effective shooters will either have figured out the distance, speed, accuracy problem, or will shoot layups massively quickly with open top hoppers to recycle the misses. If it takes you 5 seconds to empty your hotter, your first misses are already back in it by the end.
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Unread 13-01-2017, 14:00
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Re: Realistic high goal scoring rate

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Originally Posted by Kevin Sevcik View Post
especially with a fast ground pickup. Shoot two hoppers of balls, pickup your misses for cycle 3.

I think really effective shooters will either have figured out the distance, speed, accuracy problem, or will shoot layups massively quickly with open top hoppers to recycle the misses. If it takes you 5 seconds to empty your hotter, your first misses are already back in it by the end.
I consulted a very, very intelligent aero friend of mine and called in a favor. His model indicates an optimistic 7 bps directly in front of the goal from a single stream shooter. Coincidentally the tube below the funnel will accommodate 3 fuel with 1/4" between game pieces and between game pieces and the wall. I'm seeing something on the order of 18-21 fuel per second in our future potentially. I will go on record as saying that you need some kind of metering ahead of your shooter and that interface will be EXTREMELY critical if you're aiming for this kind of Lunacy™.
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Unread 13-01-2017, 14:20
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Re: Realistic high goal scoring rate

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Originally Posted by BoilerMentor View Post
I consulted a very, very intelligent aero friend of mine and called in a favor. His model indicates an optimistic 7 bps directly in front of the goal from a single stream shooter. Coincidentally the tube below the funnel will accommodate 3 fuel with 1/4" between game pieces and between game pieces and the wall. I'm seeing something on the order of 18-21 fuel per second in our future potentially. I will go on record as saying that you need some kind of metering ahead of your shooter and that interface will be EXTREMELY critical if you're aiming for this kind of Lunacy™.
Once you work that out, you should wind it up to 8 or 9 per stream, just for the video of the midair traffic jam falling back on your robot.
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Unread 13-01-2017, 14:26
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Re: Realistic high goal scoring rate

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In this game, I don't know. If you're shooting at 3 bps, it takes you 16 seconds to shoot a Hopper's worth of balls for 16 points. If you shoot at 10 bps at 50% accuracy, you take 5 seconds to shoot a Hopper's worth of balls for 25 balls or 8 points in 5 seconds. It obviously depends on the accuracy and the shooting rate, but I'd take the second robot in this case.
50% accuracy doesn't qualify as spray and pray for me. If you can find a way in any scenario to more than triple your bps at an exchange of only half the accuracy, I'd take that deal too.
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Unread 13-01-2017, 14:31
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Re: Realistic high goal scoring rate

There's flywheel shooter spray and pray where you pump out as many balls as you can past a flywheel shooter at a somewhat sustained rate for a few seconds in somewhat the same area.

Then there's "I shoot my entire hopper at once" spray and pray where you fling 50 balls into the air at once and hope that a large portion of them land in the goal funnel.
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