Discover new ways to elevate your game with the updated DGCourseReview app! It's entirely free and enhanced with features shaped by user feedback to ensure your best experience on the course. (App Store or Google Play)
Apparently Timko does know (occasionally) what he's doing since JR's and mine arrived today! Well done, 6 days from U.S. by USPS is totally unexpected and unasked for speed of delivery, probably eligible for some kind of record title.
Matti
Please do not confuse absolute and relative humidities. As Monocacy said, at 30C air can only hold 3% per weight water. Calculated examples at 1000 mbar actual air pressure:
Air densities at 30C with 10% and 100% RH are 1.15 and 1.13 g/l respectively
Air densities at 15C with 10% and 100% RH...
I don't think this is correct. For air density, temperature and air pressure are significantly more important than humidity. Sure humidity has a non-negligible effect but it's small. If you look at the varying conditions people disc golf (-20 F to 120F) and 0 ft to 6000+ ft elevations, the first...
Second this. From what I've learned from here and tried to conclude myself:
There definitely should be active elbow extension involved. There's also passive extension happening due to the "stopping elbow". They combine for the "late acceleration". _Timing_ the passive and active extension is...
If you look at his right hand in the follow through, his middle finger is extended. I have no idea why or how this happens. As if he's not gripping with middle finger at all. Is this one of the known grips?
Matti
Yeah, frame rate gives you smoothness. The slow motion videos I have posted here at DGR are shot at 250 and 300 fps depending on the camera used. Since ~25 fps gives illusion of smooth motion, 250 fps can be slowed down 10x.
On the other hand, slower frame rates can also provide useful data...
Here's a compilation of mostly unpublished slow motion footage from last summer. This time I decided to have pairs of drives side by side so you can try pick up the similarities and differences between some of the top arms. Each pair is first shown real-time then 2.5x, 5x and 10x slowed down...
JHern, I think I see your point but please keep in mind that velocity has squared influence on lift. Throwing disc with 1.4 times its cruise speed will lead to lift force of twice that is needed to keep the disc aloft. That converts to one g of radial acceleration which rapidly renders initial...
Let the discussion start:
In literature pitching moment does change sign but as a function of _AoA_, not speed. This has been stated for all kind of airfoils I have this far found, not just frisbees of which there are much less research results available. In the frisbee studies ( i.e. Potts &...
JHern,
Really can't wait for your results. I've also been thinking for some time now of putting up some sort of simulation/simulator for inspecting and understanding better how discs fly. Having a "live" disc flight chart is a great goal.
I am really interested on your thoughts on how to model...
Did part of my homework and quickly measured flight plate thicknesses of the discs in my previous study. I had to measure quite close to the rim since the micrometer I was using does not allow over 30 mm distance from the edge of the disc.
From Star Destroyer to Dx Aviar, flight plates went...
To clarify: D is the distance from inside of the rim to the center of the disc. It's not diameter of the disc which I did not need in my calculations. Just measured from the inside of the rim to the center of the disc.
To JHern and Bradley. Putters having thicker flight plates explains why...