0
Psychonaut

What is PD's mindset on their WL'ing charts?

Recommended Posts

I've been in the market for a new canopy, and besides that I've always ran my fingers across PD's wing loading charts on each canopies page.

Now does anyone have more detail they could shed on what you think PD is qualifying each category by? Between Student, novice, int, adv, expert; expert is quite clear but between novice, int, and adv seems to be cloudy.

The reason I ask is because take the Sabre2 150 for example, then run across to int, you get 150. So that's 1:1. For many, a Sabre2 at 1:1 is very docile and doesn't pose too much of a threat. Run back left across novice and you get a maximum exit weight of 135, WL of .9.

So like I said, can anyone go into detail on this? I know it won't be soley jump numbers, but that helps paint a better picture.

I was on a Sabre2 150 before getting my A, granted I am a legitimate beanpole.. The problem I'm seeing overall with this is I don't know where to categorize myself. At first I would have said novice maybe intermediate, but I'm far surpassed what their MAX exit weights are, I just don't see myself as advanced.

Blues
Stay high pull low

Share this post


Link to post
Share on other sites

I share your confusion with the skill levels. :|

One way to decode them that I have seen used by one DZ on Saftey Day was to relate them to USPA license levels:

Student = Student
A lic = Novice
B Lic = Intermediate
C Lic = Advanced
D Lic = Expert

Without a doubt, that categorization is fraught with problems, but for purposes of Safety Day it worked. Each jumper's canopies were matched to manufacturer's recommendations and if the canopies were of the reccomended size or larger, the jumper got points toward prizes. B|

The choices we make have consequences, for us & for others!

Share this post


Link to post
Share on other sites
Quote

I share your confusion with the skill levels. :|

One way to decode them that I have seen used by one DZ on Saftey Day was to relate them to USPA license levels:

Student = Student
A lic = Novice
B Lic = Intermediate
C Lic = Advanced
D Lic = Expert

Without a doubt, that categorization is fraught with problems, but for purposes of Safety Day it worked. Each jumper's canopies were matched to manufacturer's recommendations and if the canopies were of the reccomended size or larger, the jumper got points toward prizes. B|



I have a hard time categorizing myself as an intermediate with my measly B license :S...

Share this post


Link to post
Share on other sites

Have a look below the WL chart, there is a link to a PDF about "Wing Loading Interpretations" that clarifies what they mean.

As for max weight: If you surpass the max weight or WL, the canopy will no longer have the flight characteristics that the manufacturer intended. I know someone who tried overloading an Aerodyne Mamba. Not a good idea, it would sink through too much and the landings were bad too.

I think PDs Wingload charts are pretty good if read with the above mentioned document in mind.

Over here, there are wing load limits set by the national parachute association, and people treat them as recommendations, not limits, as in "I HAVE to get the smallest possible canopy!". According to them, I should run out and buy an elliptical 86 sqr ft canopy.

B|

Relax, you can die if you mess up, but it will probably not be by bullet.

I'm a BIG, TOUGH BIGWAY FORMATION SKYDIVER! What are you?

Share this post


Link to post
Share on other sites
Quote

The reason I ask is because take the Sabre2 150 for example, then run across to int, you get 150. So that's 1:1. For many, a Sabre2 at 1:1 is very docile and doesn't pose too much of a threat.



Wing loading is only one factor. Wing loading only is not the best way to determine if a canopy is the best for you. There are several other factors concerning a canopy that determine if it "doesn't pose too much of a threat". How about we put any 95 pound girl on a Velocity 111?

Share this post


Link to post
Share on other sites
Wing loading is only one factor. Wing loading only is not the best way to determine if a canopy is the best for you. There are several other factors concerning a canopy that determine if it "doesn't pose too much of a threat". How about we put any 95 pound girl on a Velocity 111?



Of course, but we all know this. Similarly we all know the point I'm trying to make when I used a Sabre as an example, not a velo.
Stay high pull low

Share this post


Link to post
Share on other sites
In the "How does one pack tandem line twists??" thread, Timmy said:

Quote

Everyone knew what you meant. Well, almost everyone. You'll have to quit making your post so cryptic so that some of the slower people can understand.



So why is he now saying:

Quote

How about we put any 95 pound girl on a Velocity 111?



You need to speed up there, Fitz, or get off the fence before your asshole collects a lot of splinters. Lord knows how many it can hold.
A round is formation, not something to jump.

Share this post


Link to post
Share on other sites
> For many, a Sabre2 at 1:1 is very docile and doesn't pose too much of a
> threat.

If you can fly it. For someone used to Navigator 280's, it can be a significant threat - hence the warnings.

>At first I would have said novice maybe intermediate, but I'm far surpassed
>what their MAX exit weights are, I just don't see myself as advanced.

"Getting away with it" does not equal "safe to do it." You can fly a Cessna 182 several hundred pounds overweight for years - that doesn't mean it's a good idea.

Share this post


Link to post
Share on other sites
Quote


The reason I ask is because take the Sabre2 150 for example, then run across to int, you get 150. So that's 1:1. For many, a Sabre2 at 1:1 is very docile and doesn't pose too much of a threat.



All parachutes, even big and lightly wingloaded ones, are unsafe and should be treated with respect. Didn't you learn that when you learned how to skydive?

:S

Anyway, you want a Pilot, not a Sabre2. Go out and demo one now;)
Relax, you can die if you mess up, but it will probably not be by bullet.

I'm a BIG, TOUGH BIGWAY FORMATION SKYDIVER! What are you?

Share this post


Link to post
Share on other sites
Quote


All parachutes, even big and lightly wingloaded ones, are unsafe and should be treated with respect. Didn't you learn that when you learned how to skydive?

:S

Anyway, you want a Pilot, not a Sabre2. Go out and demo one now;)



We aren't oblivious to the risks of skydiving, c'mon now..

And I demo'd a Pilot 150, it was quite nice but I don't have TOO much to compare it to..
Stay high pull low

Share this post


Link to post
Share on other sites
Quote

Quote

I share your confusion with the skill levels. :|

One way to decode them that I have seen used by one DZ on Saftey Day was to relate them to USPA license levels:

Student = Student
A lic = Novice
B Lic = Intermediate
C Lic = Advanced
D Lic = Expert

Without a doubt, that categorization is fraught with problems, but for purposes of Safety Day it worked. Each jumper's canopies were matched to manufacturer's recommendations and if the canopies were of the reccomended size or larger, the jumper got points toward prizes. B|



I have a hard time categorizing myself as an intermediate with my measly B license :S...


Yeah, and thats not even counting how you fly!

but, you're safe, you weigh like 90 lbs soaking wet...
"I may be a dirty pirate hooker...but I'm not about to go stand on the corner." iluvtofly
DPH -7, TDS 578, Muff 5153, SCR 14890
I'm an asshole, and I approve this message

Share this post


Link to post
Share on other sites
Interesting to compare PD to Icarus....

Wing Loadings

Class 1 - Student Canopy .5 to .75 Lbs/SqFt

This wing loading will perform basically as a student canopy. You may wish to choose a canopy in this range if you are very unsure of your ability, physically injured or disabled in some way, elderly or frail or as a student canopy. A canopy in this class should not be jumped in over 15 knots. These canopies are easily affected by turbulence.

Class 2 - Docile .75 to 1.00 Lbs/SqFt

Still a very docile range. This would suit an advanced student canopy or a first canopy for someone preferring to err on the safe side. Again affected by higher wind conditions before most canopies would be.

Class 3 - Mid Range 1.0 to1.25lbs/SqFt

This mid range of canopy is a good bench mark to work from. These canopies are high enough wing loading to start having a little fun yet low enough that a reasonably competent low time jumper could handle one as a first canopy (check with your C.S.O.) and still have a canopy they want to be jumping in a couple of hundred jumps time. This is also getting into the range that must be treated with a little respect however still has a reasonably good margin for error. Most of the canopies we sell are in this range. From this loading up, most wind conditions allowable for jumping are not a problem.

Class 4 - High performance 1.25 to 1.65 Lbs/SqFt

Now we're having fun ! We qre also into potentially high danger area! Turn speeds are increasing air speeds and speed range are increasing dramatically all of which provides us with a direct trade off between fun and safety. Canopies in this range must be flown to the ground! Recovery arcs are generally over 200 feet and toggle input movements are getting noticeably shorter. A high degree of experience and competence is necessary to handle a canopy in this range. Flying a canopy in this range must be done by feel, every maneuver must be well planned ahead as things are happening very quickly.

With a high wing loading turbulence will affect the canopy less but if affected remember you are traveling much faster. Being dropped 1/2 a meter by turbulence under a class 2 canopy is not even going to affect your stand up landing but being dropped 1/2 a meter in the middle of your ballistic turf surf could ruin your summer. The same goes for other obstacles - buildings, fences, people, other canopies, etc, have much more impact at high speeds. Even uneven ground or short landing areas should be considered obstacles. These canopies will still be traveling horizontally in nil wind conditions. A collapsible pilot chute is recommended. Lowering the slider and loosening the chest strap is suggested.

Class 5 - Extreme 1.65 to 2.00 Lbs/SqFt

Not for the faint hearted. If you are one of the few people that want to fly a class 5 canopy consider every aspect of what you are doing very carefully. On the up side there is very exhilarating airspeed, quick response times and powerful maneuverability. On the down side our margin for error has reduced to almost nothing (!), compounded by the fact that if we do make an error we are almost certainly traveling at speeds that can maim. If you have or are considering a class 5 canopy we can't tell you how to fly it in this overview, we must assume you know what you are doing.

Most people I watch flying class 5 canopies don't fly them to the limits of the canopy and the performance they achieve from their canopy could be achieved from a class 4 canopy flown to its limits with a far greater safety margin. These canopies generally have to be run out on landing. They must be fitted with a collapsible pilot chute. Lowering and collapsing the slider and loosening the chest strap is recommended. Canopy recovery arcs can be over 400 Ft radius. The step from a class 4 canopy to a class 5 canopy can be quite large i.e. for a 80 kg jumper with gear and weights the difference between a 105 and a 95 feels similar to the difference between a 130 and a 105.

Class 6 - BALLISTIC 2.0 to 2.4 Lbs/SqFt

If you are considering this, you don't need an explanation.
The difference between stupidity and genius is that genius has its limits." -- Albert Einstein

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

0