riggerrob 643
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I have a really really really really indepth lesson saved to my PC from my canopy coach.
If your still intrested in density altitude and how it applies to our wings both swooping and not, i can forward it to you.
Its fairly complicated, but he did a great job of breaking it down.
If your still intrested in density altitude and how it applies to our wings both swooping and not, i can forward it to you.
Its fairly complicated, but he did a great job of breaking it down.
arai 0
but if thinner air allowed you to fall faster, wouldnt it also provide less "grab" for your canopy to provide a hard opening? I would have thought the thicker the air the more likely a hard opening would occur.
billvon 3,031
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>wouldnt it also provide less "grab" for your canopy to provide a hard opening?
Nope. Problem there is that the _percentage_ change in speed is the same but the _absolute_ change is much higher. As an example, if you're falling at 150mph at 20,000 feet, and open your parachute, you'll slow down to (say) 15mph. If you're falling at 120mph at 2000 feet, you slow down to (say) 12mph when you open there. But in the first case you still have to lose 135mph in X seconds; in the second case you have to lose 108mph in X seconds. Even if everything else was the same (and it isn't) a 2 second opening will be softer in denser air.
Nope. Problem there is that the _percentage_ change in speed is the same but the _absolute_ change is much higher. As an example, if you're falling at 150mph at 20,000 feet, and open your parachute, you'll slow down to (say) 15mph. If you're falling at 120mph at 2000 feet, you slow down to (say) 12mph when you open there. But in the first case you still have to lose 135mph in X seconds; in the second case you have to lose 108mph in X seconds. Even if everything else was the same (and it isn't) a 2 second opening will be softer in denser air.
QuoteAt the end of the day I had just worked up a routine to shake the risers rigorously during opening. Still they were slow
OK, lets refine that technique a bit. Grab only the rear risers, and give them a symetrical tug, maybe an inch or two (your canopy may need more, but start small). This will 'encourage' the slider to come down.
It works at any temp or altitude.
rasmack 0
QuoteI have a really really really really indepth lesson saved to my PC from my canopy coach.
If your still intrested in density altitude and how it applies to our wings both swooping and not, i can forward it to you.
Its fairly complicated, but he did a great job of breaking it down.
Well, yes please. My e-mail is in my profile.
HF #682, Team Dirty Sanchez #227
“I simply hate, detest, loathe, despise, and abhor redundancy.”
- Not quite Oscar Wilde...
“I simply hate, detest, loathe, despise, and abhor redundancy.”
- Not quite Oscar Wilde...
Sending right now- let me know what cha think.
Dave
Dave
Dolph 0
Hey Ras.
Jumped this weekend as well - as you know in close to identical conditions you were jumping in.
On my normal canopy (Katana-97) I didn't experience any kind of longer opening - just the usual quick and snappy opening. Did have some funky off-heading openings but I attribute that to packing/body position.
My friends Katana-107 had very soft opening compared to the -97.
While I am sure air density is a factor, I'd think canopy design and packing are greater factors.
Don't they remove snow from the runway at your DZ? They do it here
.
Unfortunately, our hangar doors had frozen solid and the snow was piled up high outside it. Took a while to get that removed. Then we had that layer of ice somewhere in the middle of the snow. Made for some interesting landings (i.e: don't drag your foot when you swoop).
Video coming up on the flying gnu soon.
Jumped this weekend as well - as you know in close to identical conditions you were jumping in.
On my normal canopy (Katana-97) I didn't experience any kind of longer opening - just the usual quick and snappy opening. Did have some funky off-heading openings but I attribute that to packing/body position.
My friends Katana-107 had very soft opening compared to the -97.
While I am sure air density is a factor, I'd think canopy design and packing are greater factors.
Don't they remove snow from the runway at your DZ? They do it here
.
Unfortunately, our hangar doors had frozen solid and the snow was piled up high outside it. Took a while to get that removed. Then we had that layer of ice somewhere in the middle of the snow. Made for some interesting landings (i.e: don't drag your foot when you swoop
).
Video coming up on the flying gnu soon.
rasmack 0
QuoteOn my normal canopy (Katana-97) I didn't experience any kind of longer opening - just the usual quick and snappy opening...
OK, we didn't have anyone jumping handkerchiefs that day.
QuoteWhile I am sure air density is a factor, I'd think canopy design and packing are greater factors.
It's just funny that the guy working manifest was commenting on our slow openings.
QuoteDon't they remove snow from the runway at your DZ? They do it here
Did I say runway. I meant grass strip. I am sure we could pay the farmer to clear it, but hey the Cessna does a good job all by itself.
HF #682, Team Dirty Sanchez #227
“I simply hate, detest, loathe, despise, and abhor redundancy.”
- Not quite Oscar Wilde...
“I simply hate, detest, loathe, despise, and abhor redundancy.”
- Not quite Oscar Wilde...
mikkey 0
It's quite hot down here at the moment.
Last Saturday I jumped in 43 C ~ 110 F. Did not notice any difference in opening, but a) the flight to altitude took much more time b) the landing speed much faster c) interesting thermals and d) absolutely exhausted after only 3 jumps and packs....
Last Saturday I jumped in 43 C ~ 110 F. Did not notice any difference in opening, but a) the flight to altitude took much more time b) the landing speed much faster c) interesting thermals and d) absolutely exhausted after only 3 jumps and packs....
---------------------------------------------------------
When people look like ants - pull. When ants look like people - pray.
When people look like ants - pull. When ants look like people - pray.
rasmack 0
QuoteIt's quite hot down here at the moment.
Last Saturday I jumped in 43 C ~ 110 F...
I'm not jealous! I'm not!
HF #682, Team Dirty Sanchez #227
“I simply hate, detest, loathe, despise, and abhor redundancy.”
- Not quite Oscar Wilde...
“I simply hate, detest, loathe, despise, and abhor redundancy.”
- Not quite Oscar Wilde...
mikkey 0
QuoteQuoteIt's quite hot down here at the moment.
Last Saturday I jumped in 43 C ~ 110 F...
I'm not jealous! I'm not!
No reason to be. It's a public holiday tomorrow and I was planning to go to the DZ but the temperature will be up there again and it's just too damn hot. I have jumped when it was minus 10 C on the ground (in Denmark actually) and know how unpleasant that is. But trust me, jumping in extreme heat is bad too and actually can be quite dangerous. Easy to run into thermals low and being smacked into the ground... So I will spend the time i my pool instead.
---------------------------------------------------------
When people look like ants - pull. When ants look like people - pray.
When people look like ants - pull. When ants look like people - pray.
The flip side of that is that sometimes an extra pair of socks make your toes COLDER because they restrict blood flow.
So start with extra large boots and gloves, so that you will have enough room for extra socks, but still maintain circulation.
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