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I'm 150lbs jumping a 242. If I took 2 seconds with a 48" PC, are the forces involved on the PC in danger of causing damage or excessive wear? I doubt it'd be an issue for the canopy/bridle.

I'm not actually going to take 2 seconds on a 48" when I have a 42" vented, but there's an object I've jumped via go and throw but I'd like to take a longer delay and the nature of the object and LZ make me feel better using a 48 unvented rather than a 42 vented. I've taken one second on the 48" with other objects, but I'm curious to know what kinda forces are involved in an up-to-2 second delay with the 48".

I'm pretty sure I could jump the same object with a 42" vented and be fine even with a delay (especially with my canopy size), but if using a 48 doesn't cause excessive wear and gets the canopy to line stretch faster by any measurable amount, I'd prefer it over the 42, even with the vent...and I'm kinda just satisfying my curiosity here

huh?
really?

at 2 sec, you will still have a minimal amount of airspeed to act on either your pc or your main.

if you are THAT concerned about risking damage to your gear, then I would suggest you NEVER take that rig to terminal.

use 46'' :)

No. Every component involved is overbuilt by more than an order of magnitude.

I'm confident you could take a well built (and every major manufacturer's PCs qualifies as well built in this regard) 48" PC to terminal many times without creating wear issues on the gear (of course, there might be other issues).

well, i think it's a valid newbie type question...

but, it will be fine. i (and others i know) have stowed 46/48" PCs for low freefalls and even aerials.

it always comes down to the right tool for the job. just because some fancy delay chart says NO, doesn't mean that it applies to every jump in every configuration!

what about a 46" vented for 250 - 300 ft?

EDIT for context

my question wasnt in reference to wear, but would a 46 vented be suitable for a short delay from 250 to 300 ft?

while you might be correct, I wish you were not!

with any appropriate skydiving background, a newbie should realize that a BASE parachute must be tougher than a skydiving reserve. most reserves barely get used, while BASE parachutes should last hundreds of jumps. this should be a simple extrapolation from skydiving experience.

since opening forces max out at terminal, it would seem reasonable that all these parachutes should accommodate those speeds.

I can't help but feel he asked the wrong question. pc size selection (as I understand it) is more about the quality (heading, speed, reliability, etc.) sadly, that is a different discussion.

even worse, this OP is offering advice in another thread. if he wants a pass for asking newbie style questions, I would hope he would refrain from doling out technical advice.

i know im getting off topic, but im gonna ask........

i was always taught that the whole point to a 46 or 48" PC was for getting your canopy out on lower than normal freefalls where you cant quite take the "necessary" delay for using a 42......

so why would one get a vented 46 or 48" ???? i know theres a possible issue with oscillation in non-vented PC's, but at such low airspeeds why would you get a vented PC????????????

or is this simply a personal choice of flavor boiling down to F-111 vs. ZP vs. vents, etc????

if i got off track ill post this in another form

found this http://www.basejumper.com/...=vented%2048;#487571
but its a really old thread.......

im still interested in opinions

real quick, my opinion is:

i would NOT get a vented 46/48.

essentially, i agree with your thinking.

Thanks for the info guys.




I figured it was about center cell stripping, and I even said, I seriously doubt it'd make a difference and I was satisfying my own curiosity about the difference in forces involved. There exists many tables that have PC-size / delay and I'm curious about the reasoning behind many of them having such a small range for each PC size, when it seems that in order to get center cell stripping or to have any issues (gear wear), you'd have to go much further from ideal size than that.

I don't think my pilot chute is going to blow apart or anything, and ya, I could take it terminal several times. But if you take a 48 terminal several times, it's gonna have much increased wear compared to a 36, right? So I'm just curious if it's any appreciable difference in wear on a PC or if there is anything I'm not considering here.

There's no reason for you to have a cow and go off on a tangent and talking about not having a proper skydiving background.

Also, if you have a problem with any advice I give, please by all means post why it's not correct...because that's how people learn. "You do not have enough sky jumps" is not a valid reason. Also, so I dont give the wrong impression, if anyone ever approached me for advice outside of a public forum like this, I would be very reserved in what I say.

I heard he called your mother a whore....

Sometimes I think people, maybe not Zebu, ask questions like this when they already know the answer,but they just want a little extra affirmation to feel more comfortable, confident. It's like when you're geared up and you know all your shit is right, but it still feels nice to have an extra set of eyes confirm it.

I don't really see the point in getting a vented 48, either.

If you are low enough to want a 48, you ought to be going handheld and throwing in an upward direction. Pitch technique should deal with the oscillation issues that the vent is meant to help with.

Also, a center vented PC is probably more likely to hesitate than an unvented PC, and if you're low enough to want a 48, you really don't want to have a hesitation.

48" & your 242 canopy . Only think that will give you a negative affect .
Is the distortion of you center cell when you flair for landing . 48" is a big sky anchor dragging behind that small canopy .
Your canopy size & fabric weight . & your body weight flying the 242 . 42" is your best PC choice .

48" will work but you will get shitty landings compared to you towing & Flaring with the 42" .
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[quote

48" will work but you will get shitty landings compared to you towing & Flaring with the 42" .
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I agree. I have a flik 242, and my landings are not so well with the big ass anchor.

No doubt that the 48" PC will drag it out of any Container & get the job done for openings when Low . But you can even feel the Flair affected on a larger 280 sq/ft. canopy when towing one .

All you got to do is just stand off to the side & watch a smaller canopy like 242 towing a 48" PC . The visual of the distortion is very predominant . The landing will not kill you towing 48" on a small Canopy . but it really affect the pendulum on the touchdown when landing .
small Canopy & 48" Only thing might fuck you up, if you forget when your LZ is asphalt or concrete . that 'plus' if your landing into a headwind. you might get dumped more than you expect not getting good forward speed as well .
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