Mark Ellis keeps his elbow away from his body when throwing. He's a lot better than I am... and he's older. Check this out... http://www.youtube.com/watch?v=DOECjLjhiTI
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If you are talking 3/4 to parallel sidearm that maybe different, but I don't agree with wrist roll over on a submarine pitch. That's not a powerful motion and rough on the elbow akin to an overhand slider. A submarine pitch doesn't need much wrist breaking, if anything there's some roll under which makes it drop back down from the natural rising delivery. The more underhanded delivery adds more natural movement on a baseball without wrist/forearm rotations.Another large difference between Side-arm pitchers and a side-arm in disc golf is wrist movement at the end. A lot of good side-arm pitchers roll their wrist over, this causes the ball to tail in on a right handed hitter. This fact combined with angle of trajectory is what makes some side-arm pitchers so successful.
I think it goes without saying that rolling your wrist over on a disc golf forehand is not good. My bro was a straight up side-arm pitcher and it took him a long while to work out a clean forehand.
I don't see myself on tape much, but I believer I throw with my arm extended away from my body on my drives. I will admit I try to lock my arm down as much as possible if I am throwing something slower like a Buzz or putter. So in that sense keeping the elbow in helps me. Otherwise I'd say let 'er fly wide.
Think of most discs that you can easily overpower and the release angles required for a nice hyzer shot (FH or BH.) They need to be released at an angle more than 10 degrees below level (your hand goes over the disc and pushes outward) to keep a straight powerful low shot. This is very different from tossing a baseball sidearm where you want an upward release that "breaks" across the plate (causing your hand to slide under the release.)
The stress that would be placed on your wrist with an arm extended hard RHFH hyzer shot seems pretty extreme with your wrist "rolling over and pushing" towards where you are attempting to place your shot. As opposed to your wrist rolling under on a BASEBALL sidearm fastball or an "elbow in" RHFH shot where a lot of that energy is probably released in the tension between your shoulder/elbow as it interacts while you move your elbow forward in a similar throw.
~Nick
Almost none of this applies to a submarine pitch.because a baseball travels quickly for only 60 or so feet, the timing of the release is different. it needs to move slightly downward toward its target and the most power for this pitch is achieved with a fully extended arm at release. the follow through is more across the body with the arm and wrist moving slightly downward with the hand turning over. the stance is more neutral to closed.
with a disc golf sidearm, the wrist position is different. the wrist is somewhat cocked back with the palm facing slightly upward to make the disc flat for the release. unlike a pitch in baseball, the disc wants to be in the air for awhile. the stance is also a bit open. the elbow stays close to the body to create an angle between the forearm and bicep, the best way to get power and accuracy. the arm fully extends for a disc golf sidearm after the disc has been released. try to "snap" your wrist on the release while keeping your palm up. more pop and less arm than a baseball sidearm pitch.
this is why the comparison to the baseball swing is more realistic. the stance is more open to the target in a batting stance than a pitching stance. the wrist and arm also have more angle at impact (or the point of release for a disc golf sidearm). find a picture of a bat making contact with a ball at a decent angle, photoshop the bat out, and put a disc in that person's top hand on the bat. the full extension of the arm in a disc golf sidearm comes after the release, just like after the hit in baseball. the secret is keeping the elbow close and not flipping your wrist. don't close your body. yada yada yada. wordy wordy wordy.
i got chicken pox in first grade...my baseball career was cut drastically short. but i can throw a sidearm.