So, an American chap is going to skydive without a parachute

[KTF]

garyhun said:

Is he going to hit that net at terminal velocity or does he have any aides to help slow the descent?

This is the key part as they are making a big thing about him not having a parachute but he must have something else to slow his speed.

[davepoth]

LivingTheDream said:

janesmith1950 said:

18,000 jumps?

Really?

If he did one every single day, that would be 49 years worth.

If he jumped 5 times every day he jumped, that would be 5 times a day, every day, for 10 years.

This is what struck me about the whole thing (yeah yeah, jump into a big net, very good)

18000 jumps?!? Seriously?!?

It's says he's a 3rd generation sky diver so let's say he begun early when his parents were jumping so say 15?

That's 27 years or 9855 days - so close to 2 jumps a day (1.83 actually) every day (yes 7 days a week) for 27 years!! That's bonkers!!

If you were working at a skydiving school where the weather is good year round you could get way more than 5 jumps a day in.

http://skydiverdriver.blogspot.co.uk/p/what-in-wor...

This guy is averaging 2.5 flights to 11,000 feet per hour, so it's quite conceivable that if the school had enough parachutes on hand an instructor would manage the same - so somewhere around 20 jumps a day I guess, in the busy season.

[BigJonMcQuimm]

davepoth said:

If you were working at a skydiving school where the weather is good year round you could get way more than 5 jumps a day in.

http://skydiverdriver.blogspot.co.uk/p/what-in-wor...

This guy is averaging 2.5 flights to 11,000 feet per hour, so it's quite conceivable that if the school had enough parachutes on hand an instructor would manage the same - so somewhere around 20 jumps a day I guess, in the busy season.

There are people in the sport with >30k jumps.

On team training we frequently do 13+ jumps a day. We go back to back and use 2 rigs and packers.

In theory, we could do 20+ jumps a day - certainly at DZs such as Empuriabrava, who operate 3 aircraft all year round.

[Motorrad]

I say go for it, I've nothing to lose and if he lives or dies it will provide me with 10 seconds of diversion from playing pokemon go (not really that's for retards).

[Jimbeaux]

A bit of digression here. I have a war vet friend that is an amputee. He is a member of an eight man dive team, all amputees. They call themselves "Pieces of Eight".

[Ayahuasca]

To make him not die on hitting the net, the net has to be elastic.

An elastic net will throw him back into the sky at an unpredictable angle.

How does he plan to land from the altitude the net bounces him up to?

[anonymous-user]

Jimbeaux said:

A bit of digression here. I have a war vet friend that is an amputee. He is a member of an eight man dive team, all amputees. They call themselves "Pieces of Eight".

That is excellent

[750turbo]

Ayahuasca said:

To make him not die on hitting the net, the net has to be elastic.

An elastic net will throw him back into the sky at an unpredictable angle.

How does he plan to land from the altitude the net bounces him up to?

Parachute?

[ATG]

Gareth79 said:

ATG said:

I thought someone had already done this by landing on a huge pile of cardboard boxes? Maybe he was wearing a wingsuit, though?

Gary Connery landed a wingsuit into a pile of boxes, but he was wearing a parachute, presumably in case he couldn't get his approach on course. Pulling at anything under 500 feet is dicey, but having BASE jumped Nelson's Column he is one of the best in the world to handle it!

Landing into boxes: http://i.dailymail.co.uk/i/pix/2012/05/24/article-...

Nelson's Column jump: https://www.youtube.com/watch?v=KavW9VLI6lY

Edited by Gareth79 on Thursday 28th July 23:25

Ah, that's the one. Thanks for the links!

And that slight delay after he jumps off the column before he throws the canopy out ... bloody hell ... big, big clanking balls

[Jimbeaux]

garyhun said:

Jimbeaux said:

A bit of digression here. I have a war vet friend that is an amputee. He is a member of an eight man dive team, all amputees. They call themselves "Pieces of Eight".

That is excellent

Yea, I thought that was not only damn witty but a great attitude seeing their condition.

The story's wit falls flat when I have to explain to someone what a "Piece of Eight" is.

[Wacky Racer]

Smiler. said:

There's got to be a catch.

No, there's no strings attached.

[Ayahuasca]

Jimbeaux said:

garyhun said:

Jimbeaux said:

A bit of digression here. I have a war vet friend that is an amputee. He is a member of an eight man dive team, all amputees. They call themselves "Pieces of Eight".

That is excellent

Yea, I thought that was not only damn witty but a great attitude seeing their condition.

The story's wit falls flat when I have to explain to someone what a "Piece of Eight" is.

un PESO de OCHO reales

[LivingTheDream]

davepoth said:

LivingTheDream said:

janesmith1950 said:

18,000 jumps?

Really?

If he did one every single day, that would be 49 years worth.

If he jumped 5 times every day he jumped, that would be 5 times a day, every day, for 10 years.

This is what struck me about the whole thing (yeah yeah, jump into a big net, very good)

18000 jumps?!? Seriously?!?

It's says he's a 3rd generation sky diver so let's say he begun early when his parents were jumping so say 15?

That's 27 years or 9855 days - so close to 2 jumps a day (1.83 actually) every day (yes 7 days a week) for 27 years!! That's bonkers!!

If you were working at a skydiving school where the weather is good year round you could get way more than 5 jumps a day in.

http://skydiverdriver.blogspot.co.uk/p/what-in-wor...

This guy is averaging 2.5 flights to 11,000 feet per hour, so it's quite conceivable that if the school had enough parachutes on hand an instructor would manage the same - so somewhere around 20 jumps a day I guess, in the busy season.

Ah ok - thanks

Don't know much about it but the numbers are boggling!

[Jimbeaux]

Ayahuasca said:

Jimbeaux said:

garyhun said:

Jimbeaux said:

A bit of digression here. I have a war vet friend that is an amputee. He is a member of an eight man dive team, all amputees. They call themselves "Pieces of Eight".

That is excellent

Yea, I thought that was not only damn witty but a great attitude seeing their condition.

The story's wit falls flat when I have to explain to someone what a "Piece of Eight" is.

un PESO de OCHO reales

Precisely, Reales able to be broken into eight pieces, first minted in 1598 iirc. Ironically, it was a Spanish UN worker I had to explain this to while in Haiti recently.

[ATG]

KTF said:

garyhun said:

Is he going to hit that net at terminal velocity or does he have any aides to help slow the descent?

This is the key part as they are making a big thing about him not having a parachute but he must have something else to slow his speed.

He's got the net to slow him down. He doesn't need anything else. He'll only be going at about 120mph. Look how far the net is above the ground. It has many meters to slow him from 120mph to rest without turning him to mush. The forces won't need to be at all extreme. In fact let's estimate them.

Let's say that the net has only 15 metres of give in it once he's put it in some tension, and we'll assume (unrealistically) that the retarding force on him is constant. He'll hit the net at about 120mph assuming he stays in an arched position all the way down.

v^2 = 2.a.s, so the acceleration, a, is v^2 /2.s

120mph is about 53m/s, we've said s is 15m, so the acceleration is 95ms^-2 ... that's about 10g which is at the very upper end of what a fast jet pilot would pull in a turn, but a fair bit less than he'd pull in an ejector seat. (At 10g, he'll stop from 120mph in about half a second, far less time than a pilot would have to endure a high g turn)

And the force is inversely proportional to the distance the net gives, so if it can slow him down over 30m, then he'll pull an average of about 5g, etc, etc

So the forces and impulses are going to be fine if he can hit the net ... if ...

[Hilts]

Ayahuasca said:

To make him not die on hitting the net, the net has to be elastic.

An elastic net will throw him back into the sky at an unpredictable angle.

How does he plan to land from the altitude the net bounces him up to?

They're going to build some even bigger nets beside this one and hope he lands on one of them.

[Jimbeaux]

Hilts said:

Ayahuasca said:

To make him not die on hitting the net, the net has to be elastic.

An elastic net will throw him back into the sky at an unpredictable angle.

How does he plan to land from the altitude the net bounces him up to?

They're going to build some even bigger nets beside this one and hope he lands on one of them.

Hope is not a very good course of action.

[mybrainhurts]

Halb said:

Is his name....Batman?

For a short time, yes. Then it changes to Flatman.

[Hilts]

Jimbeaux said:

Hope is not a very good course of action.

I beg to differ.

[Jimbeaux]

Hilts said:

Jimbeaux said:

Hope is not a very good course of action.

I beg to differ.

I stand well corrected! Especially noting her reputation for handing out a$$ kickings, to women and men alike.