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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
I hold it true, whate'er befall;
I feel it, when I sorrow most;
'Tis better to have loved and lost
Than never to have loved at all.

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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

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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 much

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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!!!

-- (N.DG) "If all else fails – at least try and look under control." --

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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

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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 !!

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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.

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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

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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?
Flying Hellfish #470

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

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>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.

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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

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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

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

The only sure way to survive a canopy collision is not to have one.

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>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.