Forums: Skydiving Disciplines: Swooping and Canopy Control:
Effects of leaning forward/backwards in harness

 


HUPRA  (D 5203)

Jan 5, 2013, 2:48 AM
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Effects of leaning forward/backwards in harness Can't Post

I am interested to know the effects on the canopy, if any, of leaning forward or backwards in the harness. I understand that it can contribute to reducing form drag, but does it affect the glide ratio, flight characteristics, CoG etc?

Im asking this question more in relation to normal canopy flight, rather than swooping.....


davelepka  (D 21448)

Jan 5, 2013, 5:26 AM
Post #2 of 13 (2729 views)
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Re: [HUPRA] Effects of leaning forward/backwards in harness [In reply to] Can't Post

Short answer - No. From a fore/aft perspective you're hanging from a singe point, and you will always end up hanging in a balanced position due to gravity. You could try to hang more of your weight forward or back, but gravity will rotate you around that single-point (the 3-ring) and center your weight.

Long answer- do a search, this has been covered extensively in the past.


HUPRA  (D 5203)

Jan 5, 2013, 8:15 AM
Post #3 of 13 (2679 views)
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Re: [davelepka] Effects of leaning forward/backwards in harness [In reply to] Can't Post

Thanks for your answer. I'll have another search.


JanuszPS  (D 568)

Jan 5, 2013, 3:39 PM
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Re: [davelepka] Effects of leaning forward/backwards in harness [In reply to] Can't Post

from the mechanics perspective, don't you think that putting pressure on the rears you start to have some sort of semi ridgit (not pinned any more) connection from statics point of view?
Off course the amount of force translating by the rears to the hands and body is much less than thrugh the fronts, but still there is some changes in the statics (even slight). So it might have some influence in to the performance other than aerodynamics.
regs.
j.


davelepka  (D 21448)

Jan 5, 2013, 7:56 PM
Post #5 of 13 (2542 views)
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Re: [JanuszPS] Effects of leaning forward/backwards in harness [In reply to] Can't Post

 
Pushing or pulling on the rears will effect the flight of the canopy. Using the rears as a point of contact to lever yourself into position will have an effect on the flight of the canopy.

All of those things, however, are different than leaning fore or aft in the harness. Leaning fore or aft alone will not effect the flight of the canopy. Pushing, pulling, or otherwise moving the rear risers will.


stayhigh  (F 111)

Jan 7, 2013, 9:19 AM
Post #6 of 13 (2288 views)
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Re: [HUPRA] Effects of leaning forward/backwards in harness [In reply to] Can't Post

It will make you look cooler if you lean forward when landing.

Try it, and have someone video you.
and do a next jump without leaning forward.

so there, leaning forward does significant things.


(This post was edited by stayhigh on Jan 7, 2013, 9:20 AM)


Dutton  (D 15542)

Jan 8, 2013, 5:17 AM
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Re: [HUPRA] Effects of leaning forward/backwards in harness [In reply to] Can't Post

Run across the room and note your body position at the halfway mark.
You will be leaning forward.
Now run across the room leaning back, like the "keep on trucking" guy.

That is why people lean forward when landing parachutes.


unkulunkulu  (C License)

Jan 8, 2013, 5:22 AM
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Re: [Dutton] Effects of leaning forward/backwards in harness [In reply to] Can't Post

Well, it would make sense for me if you said that you try to accelerate after landing your parachute, otherwise I would rather believe stayhigh Unsure


JanuszPS  (D 568)

Jan 18, 2013, 4:41 PM
Post #9 of 13 (1890 views)
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Re: [davelepka] Effects of leaning forward/backwards in harness [In reply to] Can't Post

That's what i said.
j.


morris

Feb 8, 2013, 12:07 PM
Post #10 of 13 (1515 views)
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Re: [davelepka] Effects of leaning forward/backwards in harness [In reply to] Can't Post

In reply to:
and you will always end up hanging in a balanced position due to gravity
and because that is, there is a very reasonable difference between a frontriserinput alone (lets call it neutral, legs hanging) or a FR-input with your legs/knees brought up in front of you (not just due to formdrag!)
in the later "version" the center of mass of the pilot is moved forward, now being somewhere between his upper body and his legs
as the center of mass will place itself back "neutral" under the wing, your upperbody (= your shoulders = your risers!) will move/swing (Id say about 10inch) backwards, replacing the center of mass back where it "belongs", under the wing (you moved the center of mass out front (of neutral) by bringing up your legs)
this results in a steeper dive than frontrisers alone (were not talking about any kind of turn being involved here, just straightdoublefrontrisers)
so the answer is yes


sky12345

Feb 8, 2013, 1:22 PM
Post #11 of 13 (1477 views)
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Re: [morris] Effects of leaning forward/backwards in harness [In reply to] Can't Post

nonsense
u're simply pulling more on FR without realizing it
similar to how its easier to do pullups with knees in front of you


davelepka  (D 21448)

Feb 8, 2013, 1:28 PM
Post #12 of 13 (1475 views)
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Re: [morris] Effects of leaning forward/backwards in harness [In reply to] Can't Post

Quote:
so the answer is yes

In your example, you have to grab the front risers and use them to lever yourself into a different position under the wing. So what you're describing is more than just leaning fore/aft in the harness, it's a combination of actions that do add up to a change in the wing.

However, if you look at the sole action of leaning fore/aft in the harness, the answer remains 'no' that it will not effect the wing.


morris

Feb 9, 2013, 1:50 AM
Post #13 of 13 (1416 views)
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Re: [davelepka] Effects of leaning forward/backwards in harness [In reply to] Can't Post

In reply to:
So what you're describing is more than just leaning fore/aft in the harness, it's a combination of actions that do add up to a change in the wing.

agreed



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