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View Full Version : How does weight affect flight?


mk.ultra
09-09-2010, 01:55 AM
I'm confused. If a disc is heavier, it has more inertia, so it can potentially be thrown further. But then again if it is heavier it will fall faster. Is this correct or amidoinitwrong?

jimbosprint
09-09-2010, 02:07 AM
The better way to look at it is if it is heavier, it takes more strength to get the same spin (rotational inertia). So if you don't have the snap to throw a heavier disc, it will slow down and fade sooner. A lighter disc will spin easier and can therefore have HSS for longer. Lighter discs are also carried further by tailwinds, while heavier discs fight headwinds better.

Biscuit
09-09-2010, 08:26 AM
A lighter disc will spin easier and can therefore have HSS for longer.

High Speed Stability is the tendency for the disc to pull left (rhbh) early in the flight while speed and rotation are high. Generally, lighter discs tend to have lower high speed stability.

But then again if it is heavier it will fall faster.

Not according to classical physics. Both discs will fall at the same rate.
If both discs are thrown at the same velocity the heavier disc will have more force and be able to maintain the intended flight path longer.

A lighter disc is really only beneficial if a) the user is unable to achieve the potential of the heaver disc, b) the lower stability is desired for a certain type of shot (touch/control, turnover, ), or c) the wind is blowing at a very, very specific angle that assists in some shots.

I wouldn't count on c) and usually recommending throwing the heaviest discs someone can manage.

agent_peebody
09-09-2010, 08:39 AM
thanks Prof. Biscuit!

BogeyNoMore
09-09-2010, 09:22 AM
In addition to being less stable than heavier versions of the same disc, lighter discs provide more glide than heavier discs of the same mold.

While objects fall at the same rate regardless of mass, (if you drop 150g and 170g versions of the same disc, they should hit the ground at the same time), thrown discs don't fall... they glide. Drop a disc from your release height - I guarantee it hits the ground before your drives do.

Less mass means less gravitational force, but the lift force is a function of: a) the disc's shape b) surface area c) velocity (along the line of motion).

A & B really don't change from lighter to heavier discs: less gravitational pull on a disc, same amount of aerodynamic lift - you do the math.

Lest we forget F=ma: With less mass, the same amount of force (generated by you up to the point of release) creates greater acceleration. Therefore, lighter discs leave your hand with greater velocity (all other things being held constant). This should also translate into greater lift... which results in more glide.

Thirdly, I because of their lower mass, lighter discs don't maintain momentum as well, and are slowed quicker due to wind resistance. Hence they go further when the wind doesn't screw them up or they aren't overpowered.

agent_peebody
09-09-2010, 09:23 AM
thanks Prof. BogeyNoMore :)

Technohic
09-09-2010, 09:51 AM
Im really heavy and I cant fly at all.

agent_peebody
09-09-2010, 09:51 AM
what if i spun you REALLLY fast? any lift?

Technohic
09-09-2010, 10:00 AM
hmm when I was a kid, my older brother used to put me on one of those small merry-go-rounds and it would go real fast and eventually I would litterally go flying over a 4' high fence.(at least best results were if I cleared it)

Im a great deal heavier now so not sure he could get me up to speed. I did, however; just do such a thing to my fiance who still weights a great deal less than me but she didnt get much lift. Certainly not enough to clear a 4' fence.

BogeyNoMore
09-09-2010, 10:07 AM
Im really heavy and I cant fly at all.
Max weight Technohic?
Can I get that in FLX? ;)


what if i spun you REALLLY fast? any lift?
Lift - no.
Dizzy - yes.
:sick:


Side note : A.P. you're outta control son. Damn near 5000 posts?
in 3-4 months???!!!!!

Get out and THROW!

simpletwist
09-09-2010, 10:09 AM
hmm when I was a kid, my older brother used to put me on one of those small merry-go-rounds and it would go real fast and eventually I would litterally go flying over a 4' high fence.(at least best results were if I cleared it)

Im a great deal heavier now so not sure he could get me up to speed. I did, however; just do such a thing to my fiance who still weights a great deal less than me but she didnt get much lift. Certainly not enough to clear a 4' fence.

:clap: Laughed out loud with that one.

And is she still your fiance?

Technohic
09-09-2010, 10:11 AM
:clap: Laughed out loud with that one.

And is she still your fiance?

Yes and everything seemed fine immediately afterwards; but once the vommiting stopped, she was really mad.

Women. I just dont understand them.

BogeyNoMore
09-09-2010, 10:21 AM
She must've been R-Pro, cuz Z or Champ plastic can handle that kind of abuse and come back for more.

So, have you got her broken in just where you like her now?
You know, where she turns over just the way you like, but not too easily?

;) Just funnin' - not trying to dis your sig other!


Sorry MK - your thread's going sideways.

agent_peebody
09-09-2010, 10:23 AM
i play every morning, usually 2 rounds...can't play today cause my tailbone is screwed up. i can barely walk or i'd be out there

Kaikias
09-09-2010, 10:26 AM
Yes and everything seemed fine immediately afterwards; but once the vommiting stopped, she was really mad.

^^Quote of the Day

BogeyNoMore
09-09-2010, 10:31 AM
Yes and everything seemed fine immediately afterwards; but once the vommiting stopped, she was really mad.
Someone's gonna use that in their sig.

hendersondayton
09-09-2010, 10:36 AM
Good Stuff Here. Didn't know this. Thanks!

Technohic
09-09-2010, 10:41 AM
She must've been R-Pro, cuz Z or Champ plastic can handle that kind of abuse and come back for more.

So, have you got her broken in just where you like her now?
You know, where she turns over just the way you like, but not too easily?

;) Just funnin' - not trying to dis your sig other!


Sorry MK - your thread's going sideways.

The thing with women is they are opposite of discs. The more you break them in, the harder it is to get them to turn over.

hewittdallas
09-09-2010, 11:10 AM
The thing with women is they are opposite of discs. The more you break them in, the harder it is to get them to turn over.

Just keeps getting better and better.... :)

bazillion
09-09-2010, 11:20 AM
Techno, you just spawned a classic :clap: :clap: :clap:

billnchristy
09-09-2010, 11:26 AM
The thing with women is they are opposite of discs. The more you break them in, the harder it is to get them to turn over.

But they will flip on you at a moments notice. :doh:

mk.ultra
09-09-2010, 11:33 AM
High Speed Stability is the tendency for the disc to pull left (rhbh) early in the flight while speed and rotation are high. Generally, lighter discs tend to have lower high speed stability.



Not according to classical physics. Both discs will fall at the same rate.
If both discs are thrown at the same velocity the heavier disc will have more force and be able to maintain the intended flight path longer.

A lighter disc is really only beneficial if a) the user is unable to achieve the potential of the heaver disc, b) the lower stability is desired for a certain type of shot (touch/control, turnover, ), or c) the wind is blowing at a very, very specific angle that assists in some shots.

I wouldn't count on c) and usually recommending throwing the heaviest discs someone can manage.

In addition to being less stable than heavier versions of the same disc, lighter discs provide more glide than heavier discs of the same mold.

While objects fall at the same rate regardless of mass, (if you drop 150g and 170g versions of the same disc, they should hit the ground at the same time), thrown discs don't fall... they glide. Drop a disc from your release height - I guarantee it hits the ground before your drives do.

Less mass means less gravitational force, but the lift force is a function of: a) the disc's shape b) surface area c) velocity (along the line of motion).

A & B really don't change from lighter to heavier discs: less gravitational pull on a disc, same amount of aerodynamic lift - you do the math.

Lest we forget F=ma: With less mass, the same amount of force (generated by you up to the point of release) creates greater acceleration. Therefore, lighter discs leave your hand with greater velocity (all other things being held constant). This should also translate into greater lift... which results in more glide.

Thirdly, I because of their lower mass, lighter discs don't maintain momentum as well, and are slowed quicker due to wind resistance. Hence they go further when the wind doesn't screw them up or they aren't overpowered.

Thanks for the excellent info!

BogeyNoMore
09-09-2010, 11:39 AM
The thing with women is they are opposite of discs. The more you break them in, the harder it is to get them to turn over.

So, that's' my problem!:doh:

BogeyNoMore
09-09-2010, 12:04 PM
Another thing to consider is while lighter discs are less stable, their lower HSS can be offset by throwing them with a tail wind.

Discs travels through AIR, so their stability correlates to their velocity relative to the air, not relative to the ground. Discs thrown with a tail wind are have a lower velocity through the air than they would have if thrown with no wind. When discs are thrown slower, they behave more overstable.

This is why it's suggested to disc up (increase stability) into the wind, and disc down (decrease stability) with the wind. To some degree, you can compensate by changing weights to throw into or with the wind.


Since lighter discs are more greatly affected by wind, they often get more glide out of a tail wind than heavier discs do. I say often, because sometimes, tailwinds can have the effect of "slapping" discs down, as can be observed when putting from a distance with a tail wind.