A reserve in use, and the 1:1 glideA reserve in use: a round canopy above, the pilot under it, the neutralised paraglider hanging alongside, and the two speeds that certification allows to be equal: 5.5 m/s down and 5.5 m/s forward, a 1:1 glide. Big enough to dominate the wing, or it does not work.the paraglider, neutralised45°5.5 m/s down5.5 m/s forwarda 1:1 glide is allowedcertified, and still glidingbig enough to dominate the wing,or it does not work
Know Your Equipment

What Your Gear Can And Cannot Do

Reserves, harness protectors, helmets, carabiners and lines, from the people who design, test and repack them, with what the certification stamp does and does not promise.

Six conversations. A reserve designer with 400 openings, a pilot who reverse-engineered the harness standard, the helmet maker who was also a world champion, a competition trimmer, and a whitepaper on why a carabiner that looks fine can still fail.

8conversations6h 39m57chapters61,893words transcribed

The Eight Conversations

Open any tile for chapters, quotes and links
01Reserves

The Reserve Must Dominate The Wing

A small, light reserve passes certification because it is tested without a paraglider attached. Connected to one, it has to win a fight, and at 20 square metres it often does not.

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Urs Haari has designed reserves for decades and has close to 400 openings, most of them above ground. His first rule is size. The current standard allows a certified reserve to glide at up to 1:1, so a canopy sinking at 5.5 metres a second may also be moving forward at 5.5, around 18 km/h. Small, light designs only reach the sink rate by gliding, and gliding is harmless right up until the moment a paraglider is connected to it. Then forward speed becomes a downplane, and in safety clinics he now sees more downplanes than ever. Testing a certified reserve over water with a tandem passenger in front of him, his instrument read 50 km/h over the ground.

So his advice is to buy surface, not the lightest thing in the magazine: whatever the paraglider does, the reserve must dominate it, and at 20 square metres for an 80 kg pilot it will not. If you fly a hot wing and want a small reserve, carry two, because a reserve that ends up in the rotating paraglider's lines is game over if you are not high enough for a plan B. Round, square or Rogallo, his one-word answer to which is safest is all of them: there are good and bad designs of each, and the difference is whether it has been tested hundreds of times or only advertised.

Reserve size against the wingReserve size against the wing it has to dominate: three reserves drawn as circles of equal area to one scale, 20 m² (passes certification), 30 m² (starts to dominate) and 40 m² (or carry two), beside a 25 m² paraglider planform.the wing it has to dominate: 25 m²20 m²passes certification30 m²starts to dominate40 m²or carry tworeserves, same scale
Size

Opening time is not the question any more; they all open fast. The question is whether your reserve dominates your paraglider, whatever the paraglider does. At twenty square metres, it will not.

Urs Haari, reserve designer Episode 41, paraphrased

Drawn to scale: a 25 m² wing and three reserve canopies. Reserve hook-in weights are quoted without the paraglider attached.

02Deploying

The Throw Is A Procedure, Not A Reflex

Throw, wait for the opening, act if it does not come, then neutralise the paraglider. Only after that do you steer. The order is the same for a steerable and a non-steerable reserve.

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Haari runs clinics because the usual approach, a big collapse at the end of an SIV and throw it to see what happens, teaches nothing that lasts. The night before, pilots pull their reserve in a simulator, and 30 percent cannot get it out of the harness. Then the sequence: throw; wait for the opening; if nothing happens, get active, because pilots who wait and wait are the ones who never open it; and as it inflates, start neutralising the paraglider with a B-stall or C-stall so the two canopies stop fighting. Only then, if there is height, take a brake line of a steerable reserve in the free hand and turn away from the power line or the river.

Two things most pilots do not know. A non-steerable square or round canopy can still be nudged: pull the lines on one side and it will drift the other way, enough to miss an obstacle. And a reserve opening at 30 or 40 metres still works; even one that ends up in a tree with you hanging in the lines is a success, because you did not hit the ground. He also carries a proper hook knife, having once had to cut lines on a prototype with a twisted riser, and points out that the toy-shop knives most pilots fly with will not cut a loaded riser.

03Wear

Fabric, Metal And Line All Fail Quietly

A reserve can be ruined in three moves on cut grass, a carabiner can be fatigued and look perfect, and a competition wing can drift 18 millimetres slow without the pilot noticing. None of it shows.

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Do not ground-handle your reserve. Haari watches acro pilots dry Rogallos on the grass at Garda and says light fabric can be destroyed in two or three moves on a freshly cut slope; the damage is invisible until the canopy is hung under strong light. To air it before a repack, pull it in a simulator to check it comes out, avoid every sharp edge, and hang it on its lines indoors for 48 hours in normal humidity. Pack it the way the manufacturer says: trash packing works for acro pilots with a second reserve, but a careful pack opens cleaner and with fewer twists. Skydivers will not board a plane with a reserve packed more than four months ago. Paragliding has no such rule.

Carabiners fail the same silent way. A 20 kN rating is a static number; the loads that matter are the cyclic ones, every launch and every reopening, which grow microscopic cracks in aluminium long before anything is visible. Finsterwalder and Charly's guidance is five years for aluminium, sooner for acro, rinsed after salt air and stored dry. And lines: Brett Janaway trims competition wings for a living, and the World Cup now checks three wings a day. A new wing inflates 10 to 15 mm fast, settles toward zero over its first hours as the cascade knots bed in, then drifts slow; on the British team he found one pilot 18 mm slow who had never trimmed in a year. The limit for competition trim came down from 20 mm fast to 10 because pilots were using the tolerance as a speed setting. His own rule for everyone else: if it flies nicely, leave it alone.

04Harness

The Number On The Test Report Is The Wrong Number

The standard measures peak G in a vertical drop. What breaks vertebrae is how suddenly that G arrives, and a crumple protector delivers it as a step.

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Zsolt Ero sat on the harness standard's working group as one of its independent pilots and came away convinced it tests the wrong thing. The drop is perfectly vertical, which no real impact is, and the pass mark is a peak G value. But the NASA ejection-seat studies the industry cites also set a limit on jerk, the rate at which G rises, because it was the pilots with a fast rise who fractured vertebrae, not the ones with the highest peak. Foam and airbags compress progressively, so the curve rises smoothly. A crumple honeycomb does nothing until the load exceeds its threshold, then collapses all at once: a corner in the graph, and in his measurements a jerk several times what the previous generation of race harnesses produced.

His numbers from reading the published test files: the older race harnesses came in under the NASA limit without anyone having designed for it. Measuring jerk properly would push protectors from about 7 cm back to about 13, which is why the manufacturers' group has resisted it, and why he argues safety-critical gear should be governed independently of the people who sell it, as helmets are in motorsport. For the rest of us, the report on the test database shows the G curve for every harness; look at the shape of the rise, not just the peak. And once glide starts to matter, at around 50 hours, a stable pod is safer to progress in than a chair you are tiring of.

Same peak G, very different jerkTwo impact curves from a harness drop test. Left: foam or airbag, a smooth rise to the peak. Right: a crumple protector, flat until it yields, then a step. Same peak G; very different jerk. Under each, its jerk: the rate at which G changes, worked out from the curve above it.Foam or airbagthe rise is gradual: low jerkGsame peakjerktimeCrumple honeycombnothing, then a step: high jerkGsame peakjerktimethe corner that breaks vertebraeschematic curves · jerk worked out from each G curveSame peak G, very different jerkTwo impact curves from a harness drop test. Left: foam or airbag, a smooth rise to the peak. Right: a crumple protector, flat until it yields, then a step. Same peak G; very different jerk. Under each, its jerk: the rate at which G changes, worked out from the curve above it.Foam or airbagthe rise is gradual: low jerkGsame peakjerktimeCrumple honeycombnothing, then a step: high jerkGsame peakjerktimethe corner thatbreaks vertebraeschematic · jerk worked out from G
Foam or airbagCompresses progressively, so G rises smoothly. The peak can be the same as the other curve, but the body has time to load.
Crumple honeycombSolid until its threshold, then it gives all at once. The step is the jerk, and it is what the ejection-seat research linked to fractured vertebrae.

After Zsolt Ero, Episode 62, chapters 10 and 11. Schematic, not measured data. Under each curve, its jerk: the rate at which G changes, worked out from it.

05Helmet

What EN 966 Tests, And What A Bike Helmet Fails

A flying helmet is dropped from 1.5 metres and must keep the head under 250 G, must stop a falling point 5 mm short of the skull, and may have nothing sticking out that a line could catch.

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Christian Ciech competed at the top of hang gliding and now runs ICARO 2000, so he has both flown at the limit and built what protects you at it. EN 966 is the standard: a 1.5 metre drop with the head form registering under 250 G, a penetration test with a pointed weight that must stop at least 5 mm from the head, a chin strap that keeps the helmet on, and all of it repeated after conditioning at minus 20, plus 50, in UV and in water. A good new helmet passes at 170 to 180 G, and the softer, thicker liner that achieves that will dent under your fingertip. That is a feature.

A motorcycle helmet protects more but fails the flying test in two ways: it is too heavy for hours under a wing, and its visor and vents protrude beyond the 5 mm the standard allows, so a line can catch. Vented bike and climbing helmets fail the penetration test outright. Full-face is more protective; open-face gives more vision. Neither is wrong, and he flies open-face himself. Replace after any crash of substance, and treat the five-year rule as a recommendation for helmets that get dropped and forgotten, not a law for one that has been looked after. Camera mounts are untested territory, and a line around one is the obvious way they go wrong.

What EN 966 testsWhat EN 966 tests, in three panels: the 1.5 m drop, where the head form must see under 250 G (a good new helmet: 170 to 180 G); the penetration test, where a falling point must stop 5 mm short of the head; and the 5 mm rule for anything on the shell.1.5 mDrop testhead form must see under 250 Ga good new helmet: 170 to 180 G5 mm gapPenetrationa falling point must stop 5 mm short of the headvented bike and climbing shells fail here5 mm maxNothing to snagshell parts, mounts and cameras: 5 mm or lessa line round a camera is the failure modeWhat EN 966 testsWhat EN 966 tests, in three panels: the 1.5 m drop, where the head form must see under 250 G (a good new helmet: 170 to 180 G); the penetration test, where a falling point must stop 5 mm short of the head; and the 5 mm rule for anything on the shell.1.5 mDrop testhead form must seeunder 250 Ga good new helmet: 170to 180 G5 mm gapPenetrationa falling point muststop 5 mm short of theheadvented bike andclimbing shells failhere5 mm maxNothing to snagshell parts, mountsand cameras: 5 mm orlessa line round a camerais the failure mode
Drop1.5 metres onto a head form, under 250 G. Repeated hot, cold, wet and after UV.
PenetrationA pointed weight must stop 5 mm short. Big vents fail here, which is why bike and climbing helmets are not flying helmets.
Nothing to snagAnything on the shell within 5 mm. Motorcycle visors, and most camera mounts, are outside it.

After Christian Ciech, Episode 25, chapters 3, 4 and 5.

Worth Remembering

Each one links to the chapter where it is said
Before you need it

Pull it out in a simulator

In Urs Haari's clinics, pilots hang in a simulator the night before and throw. Three in ten cannot get the reserve out of their harness. That is the cheapest, most decisive equipment test in the sport, and the one almost nobody does. Then, if you can, throw it for real over water.

Urs Haari Analysing a deployment that went wrong
30%of pilots could not get their reserve out of the harness in the simulator
4mothe repack age past which a skydiver is refused a seat on the plane
01

Reserve

01

Buy surface, not weight

Certified reserves are allowed to glide 1:1. Connected to a paraglider that becomes a downplane. Go big, or go two.

Urs Haari How skydiving handles repacking, and we do not
02

If it does not open, act

Pilots who throw and wait are the ones who never open it. Get active, then neutralise the paraglider.

Urs Haari Analysing a deployment that went wrong
03

You can steer a round one

Pull the lines on one side and it drifts the other. Not a spot landing, just enough to miss the power line.

Urs Haari Introduction
02

Protection

04

Read the curve, not the peak

Every harness report shows G against time. A smooth rise is what the body tolerates. A step is jerk.

Zsolt Ero Reading a harness test report
05

A soft liner is a good sign

The new helmets that pass at 170 G have thicker, softer polystyrene. If it dents under your fingertip, it is working.

Christian Ciech Telling when a helmet needs replacing
06

Bike helmets are not flying helmets

Vents fail the penetration test and sharp edges catch lines. EN 966 or it is improvisation.

Christian Ciech Climbing helmets in hike and fly
03

Wear

07

Never ground-handle a reserve

Two or three moves on cut grass can ruin light fabric, invisibly. Hang it indoors for 48 hours instead.

Urs Haari Where the federations need to step in
08

Aluminium fatigues in silence

Five years for carabiners, less for acro. A 20 kN rating says nothing about cyclic loads or cracks you cannot see.

Finsterwalder & Charly Dirt, salt water, drying and storage
09

A new wing is fast, then slow

10 to 15 mm fast on first inflation, zero after the knots bed in, then drifting slow. If it flies nicely, leave it.

Brett Janaway Judging trim in the field
FAQ

Questions These Conversations Answer

Each answer links to the chapter of the episode where the guest says it.

10questions
8episodes

How big should my reserve parachute be?

Bigger than the marketing suggests. Urs Haari's test is whether the reserve dominates the paraglider whatever the paraglider does, and he says a 20 square metre canopy for an 80 kg pilot will not. Certification allows a 1:1 glide, so small reserves pass by gliding, which becomes a downplane once a wing is attached. Buy surface, and if you insist on small, carry two.

Urs Haari Fifty kilometres an hour under a reserve

Round, square or Rogallo: which reserve is safest?

All of them, and none of them, according to Haari, who has tested nearly everything on the market. There are good and bad rounds, squares and Rogallos. What separates them is whether the design has been tested hundreds of times in real openings or only described in a brochure. A steerable reserve only helps if you have practised steering it.

Urs Haari A collapse, a broken back, and a system unused

What do I do if my reserve does not open?

Get active. Haari says the pilots who throw and then wait are the ones who never see an opening; there are ways to help a hesitating canopy, and they need to be learned before the day. As it inflates, neutralise the paraglider with a B-stall or C-stall so the two stop fighting. Only after that, if there is height, steer.

Urs Haari Analysing a deployment that went wrong

Can I steer a non-steerable reserve?

A little, and it can be enough. Pull in the lines on one side of a round or square canopy and it will drift the other way; Haari uses it to avoid a power line, a house or a river, not to pick a landing. It works better with some wind. Try it over water first, because the first time is not the time to find out.

Urs Haari Introduction

Can I air my reserve on the grass before repacking?

No. Light reserve fabric can be ruined in two or three moves on freshly cut grass, and the damage does not show until the canopy is hung under strong light. Haari's method: pull it in a simulator to check it comes out, avoid any sharp edge, and hang it on its lines indoors for 48 hours before packing it the way the manual says.

Urs Haari Where the federations need to step in

Is a thin crumple protector as safe as foam?

Not in the way that matters, argues Zsolt Ero. It can pass the peak-G drop test, but a honeycomb does nothing until its threshold and then collapses at once, delivering the load as a step. The ejection-seat research the standard leans on links that rate of rise, the jerk, to fractured vertebrae. Foam and airbags compress progressively, and the older race harnesses came in under the limit.

Zsolt Ero Why a smooth stop matters more than a strong one

How do I read a harness test report?

Every certified harness has a published drop-test graph of G against time. Most pilots look up the peak and stop. Ero says to look at the shape of the first rise: a smooth curve means a spring-like protector, a near-vertical corner means a crumple structure that did nothing until it gave way. The peak matters less than how suddenly it arrives.

Zsolt Ero Reading a harness test report

Can I fly with a climbing or cycling helmet?

You can, but it is not a flying helmet. Christian Ciech says the vents that make them cool to hike in fail the EN 966 penetration test outright, and their sharp edges can catch lines. A motorcycle helmet fails for the opposite reasons: too heavy for hours of flying, and its visor and vents protrude beyond the 5 mm the standard allows.

Christian Ciech Climbing helmets in hike and fly

How often should I replace my helmet and carabiners?

Helmet: after any real crash, and otherwise the five-year rule is a recommendation for helmets that get dropped and forgotten, not a law for one that is looked after. Carabiners: aluminium fatigues from cyclic loads with no visible sign, so five years is the guidance, sooner for acro, and steel is not immune. Rinse after salt air, store dry.

Finsterwalder & Charly and Christian Ciech Dirt, salt water, drying and storage

Why does a paraglider need trimming, and when?

Lines shrink with use and the cascade knots tighten, so a new wing that inflates 10 to 15 mm fast settles to zero over its first hours and then drifts slow. A slow competition wing climbs badly and recovers worse. Brett Janaway trims after about 20 to 30 hours, checks again as it stabilises, and never spirals a trimmed comp wing down. If it flies nicely, do not touch it.

Brett Janaway Judging trim in the field