Sep 30, 2003, 11:24 AM
Post #1 of 14
Canopy size advice
Question for all you experienced peeps out there.... I am reading alot about zero porocity...wing loadings....7/9cells etc....but I have a couple of newbie questions 1) I know you should talk to your instructor ( and I do) but how do you calculate ..for want of a better word...what is the minimum canopy size you should be jumping.
2) what is wing loading....how is it calculated and what is recommended/not recommended for newly qualifieds.
3) how do ZP canopies affect overall canopy size and wing loading?
1. 1:1 is recommended for skydivers in the fetus stages of their careers
2. see above
3. does not...zp affects canopy flight as it is not as porous as F111...meaning air will not pass through the material, will affect the canopy's glide.
zp will make it more challenging when you are learning to pack, but it just takes practice
4. smaller reserve....don't know, mine is smaller b/c of my container size, but i am not worried aboot it, my canopies are huge (but then again so am i). 7cell reserve flies different than 9cell main, more docile, etc blah blah blah
don't ever be afraid to ask a question of your instructors, it's better than listening to some donkey like me online. your instructors and more knowledgable jumpers at your dz are always available to answer questions, i am offering their services to you now.
edit for fat fingers and small keys
(This post was edited by TheMonkey on Sep 30, 2003, 11:38 AM)
k.....thanks guys....soooo whats the typical 'weight' of a Large rig....typically
25 lb is a half decent number.
Ok.....so how does ZP affect canopy size choice?
The fabric that is not ZP is usually known as "F-111". The nutshell about F-111 is that it can not be loaded above 1:1, and it wears out relatively quickly compared to ZP.
ZP can be loaded above 1:1, while F-111 mains can not.
Newer F-111 reserves can be loaded above 1:1, but this characteristic only applies to reserves, and not mains. Reserves wear less because they're not frequently used. Mains would wear out too quickly at higher wingloadings.
You would be hardpressed to find a new f-111 canopy. Yes, ZP is the way to go.
And why are reserves generally F111 ratheer than ZP...surely you want the best performance possible if you pullout the reserve..?
When they're new, F-111 fabric is has the same characteristics of ZP. The biggest difference is that they wear differently. Since we rarely (if ever!) use our reserves, they just don't wear that much. A reserve with 20 jumps is considered well used... but that would also be considered a nearly brand new main.
Having ZP is only important on your main because of the number of jumps you'll put on it.
BTW - you can get a ZP reserve. Precision sells them. That said, your rigger will kill you because he has to pack it. ZP is more dificult to pack then F111 because it's slick.