Disc Golf Course Review Explanation of the physics of flying discs (FIXED)
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#181
09-07-2015, 02:42 AM
 wolfmandragon * Ace Member * Join Date: Jan 2014 Location: Morristown, TN Years Playing: 6.1 Courses Played: 19 Throwing Style: RHBH Posts: 2,733 Niced 1,252 Times in 721 Posts

Quote:
 Originally Posted by Kodachrome The only logical conclusion I can come to is that only grip really effects the spin imparted to the disc for any given speed. all that matters is how much of a pinch you've got at the end and where that fulcrum is located. The style of the throw does not enter the equation. Less of a pinch force or inward on the disc=less spin. More of a pinch force or outward on the disc=more spin. However, I think we can all agree that you want to be gripping the disc close to the rim, not out on the flight plate, so I think the argument is impractical. And a loose grip+high launch speed equals early release, also undesirable. So really the question isn't can you consciously influence how much spin is imparted....It's a question of how to produce the most spin for any given throw. And that is simple. Create as fast a hand speed as possible and hang on as tight as you can.

This would only be true if the fulcrums all moved on the same path, but they do not. Fast hand speed straight forward will create zero spin. The disc needs to be moving very fast on a straight-ish line before the contact point is pulled off this line. The quicker the contact point is pulled off line, the faster the spin. The are no free lunches, so some of the forward momentum is robbed and translated into spin. The amount of energy needed to create spin is less than the energy needed to create flight speed, so not a terrible big deal.

Different styles of throws move off line at different rates. It's not about conscious control of how much spin is being imparted, it is about the entire movement chosen and performed.

As far as holding on as tight as I can, I have very good grip strength, the disc is not leaving my hand.... Period.

Last edited by wolfmandragon; 09-07-2015 at 02:46 AM.
#182
09-07-2015, 02:21 PM
 sidewinder22 * Ace Member * Join Date: Nov 2008 Location: Creeping Creek DGC Years Playing: 13.5 Courses Played: 220 Posts: 15,276 Niced 2,994 Times in 1,826 Posts

Quote:
 Originally Posted by wolfmandragon Watch the Swedish throwers on slow motion and you will see a loose wrist. A locked wrist saps power out of any movement. The wrist is loose up until the hit, then it goes firm. Experiment with it, try locking your wrist before the back swing and see what it does to the disc. The tension of locking your wrist will spread to your shoulder. If it was easy to have the timing down perfect, we would all be pros. It takes some students years to learn how to do the proper loose tight loose sequence needed to perform a proper strike. I am using a strike, something that is much easier measured, to show what I mean here.
Several top distance throwers have said they throw with a "locked wrist". The wrist can be somewhat locked into a position before the throw without much strain because there is no momentum on the disc yet. It's only when the momentum increases that firmness increases to somewhat resist bending and loads. A firmer spring that moves less can load and unload more momentum.
#183
05-29-2017, 09:37 AM
 Olorin * Ace Member * Join Date: Jun 2007 Location: Scottsville, VA Years Playing: 40.7 Courses Played: 426 Throwing Style: RHBH Posts: 2,135 Niced 147 Times in 71 Posts

Happy 10th Birthday DGCR!

Lots of good information here but it is mixed in with a great deal of errors so you have to sift out the nuggets. In the end, there is still a great deal that we just don't know for sure about the aerodynamics of flying discs. Look for links to Master's theses and other scholarly papers for more reliable information.
#184
06-16-2017, 09:00 AM
 Olorin * Ace Member * Join Date: Jun 2007 Location: Scottsville, VA Years Playing: 40.7 Courses Played: 426 Throwing Style: RHBH Posts: 2,135 Niced 147 Times in 71 Posts

DG Resources has a summary with links to find technical research papers on the aerodynamics of flying discs.

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#185
06-16-2017, 09:02 AM
 Olorin * Ace Member * Join Date: Jun 2007 Location: Scottsville, VA Years Playing: 40.7 Courses Played: 426 Throwing Style: RHBH Posts: 2,135 Niced 147 Times in 71 Posts

My summary of what makes a RHBH flying disc turns right at DG Resources.
#186
06-16-2017, 09:03 AM
 Olorin * Ace Member * Join Date: Jun 2007 Location: Scottsville, VA Years Playing: 40.7 Courses Played: 426 Throwing Style: RHBH Posts: 2,135 Niced 147 Times in 71 Posts

My summary of incorrect aerodynamic theories of the physics of flying discs at DG Resources. (incomplete)

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#187
06-16-2017, 09:46 AM
 Olorin * Ace Member * Join Date: Jun 2007 Location: Scottsville, VA Years Playing: 40.7 Courses Played: 426 Throwing Style: RHBH Posts: 2,135 Niced 147 Times in 71 Posts

There's only one fact of frisbee fysics that I know for sure:
"Flat flip flies straight"

(I wonder if that eminent aeronautical engineer, Dr. Headrick, coined that jingle too?)

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#188
06-16-2017, 11:31 AM
 FlipFlat Birdie Member Join Date: Sep 2016 Location: Western NY. Posts: 308 Niced 25 Times in 20 Posts

Quote:
 Originally Posted by Olorin There's only one fact of frisbee fysics that I know for sure: "Flat flip flies straight" (I wonder if that eminent aeronautical engineer, Dr. Headrick, coined that jingle too?)
"Flip Flat flies straight "
#189
07-12-2018, 10:43 PM
 DavidIYork Newbie Join Date: Jul 2018 Location: Switzerland Courses Played: 3 Posts: 1 Niced 1 Time in 1 Post

Wow. This was a very interesting read. Thanks so much for putting that together! I'll have to go over this thread again, so much valuable info. I just started playing a little over a month ago and this feels like a goldmine into understanding more about the flight of discs ��

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#190
01-02-2019, 05:13 PM
 OveHalseth Newbie Join Date: Sep 2018 Courses Played: 3 Posts: 2 Niced 4 Times in 1 Post

I'm just missing one bit of information, and that is how much spin will affect the flight path.
In other words if a disc is thrown exactly the same, only thing differs is the amount of spin, how would that affect the flight?

I'm not sure how much you could change the spin of a throw, but if you are dragging the disc by the nose in the throw, you will generate less spin than if you keep the grip on the outside of the disc for as long as possible during the throw, and at the end it will snap out with a lot more spin.

One observation is that wet discs tend to be less stable, and my guess is that that's because you are not able to get that much snap and spin on a wet disc.

And that might also be why sidearm throws tend to need more stable discs?