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Forum: Technique & Strategy Yesterday, 10:03 PM
Replies: 154
Views: 3,641
Posted By DG_player
It means the equation Precession = Torque /...

It means the equation Precession = Torque / (Moment of Inertia * Spin) is a very very good approximation for high spin rates.

That's pretty much it. There's no magic spin speed where physics...
Forum: Technique & Strategy Yesterday, 08:53 PM
Replies: 154
Views: 3,641
Posted By DG_player
There's no such thing as a "true gyroscope". ...

There's no such thing as a "true gyroscope".

If it's spinning it acts like something that's spinning. Period, that's it. There's no magic spin rate that makes something become gyroscopic. The...
Forum: Technique & Strategy Yesterday, 08:38 PM
Replies: 154
Views: 3,641
Posted By DG_player
For what, you special magical disciness that...

For what, you special magical disciness that defies the laws of physics?
Forum: Technique & Strategy Yesterday, 08:18 PM
Replies: 154
Views: 3,641
Posted By DG_player
...other than the actual real physics involved. ...

...other than the actual real physics involved.

Let's see what's your explanation is:

The wavy effect of disc flight causes it to cooridinate around the super spin field of disciness.
Forum: Technique & Strategy Yesterday, 08:13 PM
Replies: 154
Views: 3,641
Posted By DG_player
SW, you have no clue what he's even talking about...

SW, you have no clue what he's even talking about so quit quoting him.

After your hole spiel on polhode motion I'm completely convinced you have no clue what you're talking about and are aren't...
Forum: Technique & Strategy Yesterday, 08:05 PM
Replies: 154
Views: 3,641
Posted By DG_player
Definitely a funny video. Like I said, I'll...

Definitely a funny video.

Like I said, I'll respect your opinion on how to throw a disc, not on the physics behind why it flies the way it does.
Forum: Technique & Strategy Yesterday, 03:50 PM
Replies: 154
Views: 3,641
Posted By DG_player
It comes down to momentum and energy, and the...

It comes down to momentum and energy, and the conservation laws that govern them.

Angular momentum = (moment of inertia) * (spin)

If you take a flat uniform disc for example: Let's say it...
Forum: Technique & Strategy Yesterday, 08:49 AM
Replies: 154
Views: 3,641
Posted By DG_player
It starts out wobbly, and get's less wobbly...

It starts out wobbly, and get's less wobbly throughout the flight. It doesn't go wobbly -> unwobbly -> wobbly.

I refer you to:

https://www.youtube.com/watch?v=5Sn2J1Vn4zU

Watch the whole...
Forum: Technique & Strategy 07-22-2016, 08:58 PM
Replies: 154
Views: 3,641
Posted By DG_player
What's the squiggly line?

What's the squiggly line?
Forum: Technique & Strategy 07-22-2016, 05:40 PM
Replies: 154
Views: 3,641
Posted By DG_player
:confused: Are you saying the center of the...

:confused:

Are you saying the center of the disc is going to follow the squiggly path?
Forum: Technique & Strategy 07-21-2016, 10:53 PM
Replies: 154
Views: 3,641
Posted By DG_player
Ok, what do you even mean by that? What...

Ok, what do you even mean by that? What increases? What exactly are you referring to when you say the "modulation increases"?
Forum: Technique & Strategy 07-21-2016, 10:51 PM
Replies: 154
Views: 3,641
Posted By DG_player
What you just quoted explains the exact same...

What you just quoted explains the exact same thing that is happening here (from one of your prior posted youtubes):


NeXIV-wMVUk

If you watch the wheel, it doesn't precess a perfect 90...
Forum: Technique & Strategy 07-21-2016, 11:53 AM
Replies: 41
Views: 1,509
Posted By DG_player
In addition to ultimate discs having a "flat"...

In addition to ultimate discs having a "flat" pitching coefficient. You also have to remember that it's only at a high angle of attack for a very short time after release.

If you watch the brodie...
Forum: Technique & Strategy 07-21-2016, 11:01 AM
Replies: 154
Views: 3,641
Posted By DG_player
I accept your point that I misinterpreted him in...

I accept your point that I misinterpreted him in assuming he was attributing late flight fade to the magnus effect.

A top isn't actually wobbling. It's just precessing in a circle. The...
Forum: Technique & Strategy 07-20-2016, 10:54 PM
Replies: 154
Views: 3,641
Posted By DG_player
I saw your post. You keep quoting sections about...

I saw your post. You keep quoting sections about polehode motion and how it's the path a rotating object takes from rotation around it's axis of minimum inertia to maximum inertia. Which is...
Forum: Technique & Strategy 07-20-2016, 10:48 PM
Replies: 154
Views: 3,641
Posted By DG_player
There's one part in the entire link you provided...

There's one part in the entire link you provided that talks about turning left late in flight. He attributes it to the Magnus effect. Given that's the only part where he discusses turning left late...
Forum: Technique & Strategy 07-20-2016, 09:40 PM
Replies: 154
Views: 3,641
Posted By DG_player
I'm just going to straight up ask you a question:...

I'm just going to straight up ask you a question:

What do you think the axis of maximum inertia is for a disc, and what do you think the axis of minimum inertia is for a disc?
Forum: Technique & Strategy 07-20-2016, 09:04 PM
Replies: 154
Views: 3,641
Posted By DG_player
I'm not going to argue with the guy's...

I'm not going to argue with the guy's credentials.

I'm sure he's pretty sharp if he works for NASA jet propulsion. He may reconsider some of things he said back in college though:



I'm not...
Forum: Technique & Strategy 07-20-2016, 05:05 PM
Replies: 41
Views: 1,509
Posted By DG_player
If you watch the Brodie video, it looks like he's...

If you watch the Brodie video, it looks like he's throwing it downward at like a -15 degree down angle, while holding the nose of the disc maybe 5 degree or so above the horizon.

So you're talking...
Forum: Technique & Strategy 07-20-2016, 10:53 AM
Replies: 154
Views: 3,641
Posted By DG_player
Once again, you've quoted someone referring to a...

Once again, you've quoted someone referring to a disc flying through atmosphere. Not a disc barrel rolling on it's own accord without external torques being applied.
Forum: Technique & Strategy 07-20-2016, 10:51 AM
Replies: 154
Views: 3,641
Posted By DG_player
I don't think anyone is arguing against that. ...

I don't think anyone is arguing against that. I'm just arguing your contention that it's due to changing the position of the COM, rather than changing the airflow over the disc and it's flight...
Forum: Technique & Strategy 07-20-2016, 10:48 AM
Replies: 154
Views: 3,641
Posted By DG_player
I'm not sure you should be taking an undergrad's...

I'm not sure you should be taking an undergrad's physics report as definitive.

He gets the section you bolded on wobble wrong.

He also attributes the fade at the end of flight to the magnus...
Forum: Technique & Strategy 07-20-2016, 09:22 AM
Replies: 41
Views: 1,509
Posted By DG_player
Stall is purely a function of angle of attack. ...

Stall is purely a function of angle of attack. However if you have any experience with aircraft, you'll be aware that the airspeed indicator gives a "stall speed", and rarely will there be a...
Forum: Technique & Strategy 07-19-2016, 01:06 AM
Replies: 154
Views: 3,641
Posted By DG_player
I'm done arguing with you sidewinder. I...

I'm done arguing with you sidewinder.

I will continue to respect your opinion on how to throw a disc.
Forum: Technique & Strategy 07-18-2016, 08:47 PM
Replies: 154
Views: 3,641
Posted By DG_player
That has absolutely nothing to do with whether...

That has absolutely nothing to do with whether it's a principal axis or not.

Secondly a continuously applied torque will not cause wobble, it will cause precession.
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