Forums: Skydiving: Safety and Training:
Wing loading

 


akarunway  (A 143885)

Mar 10, 2004, 3:36 PM
Post #1 of 14 (1401 views)
Shortcut
Wing loading Can't Post

I was always told there was no such thing as a stupid question so here goes. Out the door = you and total gear. Once you deploy your main shouldn't your wing loading be caculated - your main


TALONSKY  (D License)

Mar 10, 2004, 3:42 PM
Post #2 of 14 (1387 views)
Shortcut
Re: [akarunway] Wing loading [In reply to] Can't Post

Well, technically the canopy (fabric plus suspension lines) is holding the weight of it's self too so wing loading is based on your exit weight (you plus gear)
Kirk


DeNReN  (B 5642)

Mar 10, 2004, 3:46 PM
Post #3 of 14 (1385 views)
Shortcut
Re: [akarunway] Wing loading [In reply to] Can't Post

I am not a instructor! I am a student!

Your worried about a few lbs?...damn...to take a "dump" before a jump will not effect your W/L that muchWink


freakydiver  (D 26421)

Mar 10, 2004, 3:49 PM
Post #4 of 14 (1380 views)
Shortcut
Re: [akarunway] Wing loading [In reply to] Can't Post

Huh - never really thought of it that way - it would only be a few pounds, but good thought... I am not smart enough to answer this question tho - come on engineers!!!


SkydiveMO  (D License)

Mar 10, 2004, 3:51 PM
Post #5 of 14 (1379 views)
Shortcut
Re: [akarunway] Wing loading [In reply to] Can't Post

Yep! the only way you're going to subtract your main is by cutting it away. Then you can recalculate your wing loading on the reserve Wink


Zoter

Mar 10, 2004, 3:57 PM
Post #6 of 14 (1366 views)
Shortcut
Re: [SkydiveMO] Wing loading [In reply to] Can't Post

hmm didnt think about that when I ordered my big reserve.....guess I'll have plenty of time to on the long slow canopy ride down on that bass ass reserve when ( and I think thats the right mentality rather than if...) I have to chop !!Wink


Premier billvon  (D 16479)
Moderator
Mar 10, 2004, 4:07 PM
Post #7 of 14 (1352 views)
Shortcut
Re: [akarunway] Wing loading [In reply to] Can't Post

Your main parachute loading is equal to your exit weight divided by the square footage of the parachute. The main is included; it has to support its own weight, after all.


pilotdave  (D License)

Mar 10, 2004, 4:09 PM
Post #8 of 14 (1350 views)
Shortcut
Re: [akarunway] Wing loading [In reply to] Can't Post

It's no different than calculating the wing loading of a plane. Since most planes store their fuel in the wings, they're a very significant percentage of the weight of the plane. Wouldn't make any sense to leave them out of the calculation.

Dave


JumpCrazy  (B 5282)

Mar 10, 2004, 6:40 PM
Post #9 of 14 (1305 views)
Shortcut
Re: [billvon] Wing loading [In reply to] Can't Post

In reply to:
The main is included; it has to support its own weight, after all.

I see what you are saying about the chute carrying its own weight, however, the weight that matters in wingloading of a chute - that is the weight that affects the performance - is the suspended weight right? The suspended weight (you and rig minus main) is what affects turn rate and dive of the canopy. Sooo even though we are only talking about 6 or so pounds, I think that the effective wingloading should not technically include the main. Does this make sense?


(This post was edited by JumpCrazy on Mar 10, 2004, 6:41 PM)


dubbayab

Mar 10, 2004, 6:45 PM
Post #10 of 14 (1304 views)
Shortcut
Re: [DeNReN] Wing loading [In reply to] Can't Post

Your worried about a few lbs?...damn...to take a "dump" before a jump will not effect your W/L that much
------------------------------------------------------------
WORD!Tongue


Premier billvon  (D 16479)
Moderator
Mar 10, 2004, 7:36 PM
Post #11 of 14 (1282 views)
Shortcut
Re: [JumpCrazy] Wing loading [In reply to] Can't Post

>I see what you are saying about the chute carrying its own weight,
> however, the weight that matters in wingloading of a chute - that is
> the weight that affects the performance - is the suspended weight right?

No. A canopy must generate enough lift to counter the entire weight of the system; there's no aerodynamic 'trick' that allows the weight of the wing to not be supported by this lift. If you doubled the weight of the canopy (say from 6 pounds to 12) the performance of the canopy would change a bit; it would be similar to what happens when you add 6 pounds of weight in a weight belt, at least in a steady glide.


Blahr

Mar 11, 2004, 5:36 AM
Post #12 of 14 (1201 views)
Shortcut
Re: [akarunway] Wing loading [In reply to] Can't Post

Of course.

Additionally, when measuring my total body weight, if I'm standing up I dont include the weight of my legs.
Since they are holding me up their mass doesnt count CrazyCrazyCool


(This post was edited by Blahr on Mar 11, 2004, 5:36 AM)


kallend  (D 23151)

Mar 11, 2004, 11:39 AM
Post #13 of 14 (1137 views)
Shortcut
Re: [Blahr] Wing loading [In reply to] Can't Post

In reply to:
Of course.

Additionally, when measuring my total body weight, if I'm standing up I dont include the weight of my legs.
Since they are holding me up their mass doesnt count CrazyCrazyCool

So a fat-ass obese person who's sit-flying can exclude the weight of their ass?


propilot  (C License)

Mar 11, 2004, 5:51 PM
Post #14 of 14 (1095 views)
Shortcut
Re: [billvon] Wing loading [In reply to] Can't Post

In reply to:
>I see what you are saying about the chute carrying its own weight,
> however, the weight that matters in wingloading of a chute - that is
> the weight that affects the performance - is the suspended weight right?

No. A canopy must generate enough lift to counter the entire weight of the system; there's no aerodynamic 'trick' that allows the weight of the wing to not be supported by this lift. If you doubled the weight of the canopy (say from 6 pounds to 12) the performance of the canopy would change a bit; it would be similar to what happens when you add 6 pounds of weight in a weight belt, at least in a steady glide.



Amen.Smile



Forums : Skydiving : Safety and Training

 


Search for (options)