I know I've already chewed this rot up at:
http://www.kitestrings.org/post3637.html#p3637
but it needed more work. And it's a good lead-in to several more issues that could use some addressing.
http://www.hanggliding.org/viewtopic.php?t=28290
Report about fatal accident at Quest Air Hang Gliding
Guest - 2013/02/08 04:21:13 UTC
A tragic loss.
From having witnessed hundreds of tow launches in mid day thermal conditions, I imagined that as the tug rose quickly in the lift, Zachary found himself very low in relation to the tug and with his airspeed dropping ( the result of the tug going up more than going forward.) Your description is somewhat vague when describing the events occurring from the 50' level to the 150' level, but I imagined Zachary might have pushed out hard to try to "catch up" to the tug's altitude (even before the tug leveled out or began to descend to his level) resulting in a high AOA, slow relative airspeed, a small but strong thermal...
Yeah. SMALL...
http://ozreport.com/forum/viewtopic.php?t=30971
Zach Marzec
Mark Frutiger - 2013/02/08 19:12:21 UTC
Zack hit the lift a few seconds after I did. He was high and to the right of the tug and was out of my mirror when the weak ling broke. The load on the tug was not excessive as with a lockout, but I was not surprised when the weak link broke. I was still in the thermal when I caught sight of Zack again. I did not see the entry to the tumble, but I did see two revolutions of a forward tumble before kicking the tug around to land. The thermal was still active in the area that I had just launched from so I did a go round and landed on a runway 90 degrees cross to the direction we were towing in.
...but strong. Did you even bother giving the reports anything better than quick skims?
...and then the weaklink breaks. The horror...
How could this combination of factors have ended any differently? What options did either pilot have at that moment in time?
What options did the front end guy need?
The load on the tug was not excessive as with a lockout, but I was not surprised when the weak link broke.
Hard to imagine Zack's Rooney Link giving Mark's Dragonfly a much wider safety margin.
Despite the excellent safety record of the (modern) tow program...
Relative to what? Upon what data are you basing that declaration? The extensive crash data USHGA works so hard to gather and publish in the magazine? As far as I can tell from the magazine Terry Mason and Zack Marzec are still doing just fine.
I think all pilots must accept that this could happen to them in mid day conditions, regardless of their experience or the glider they happen to be flying.
As long as everyone's forced to fly with glider end weak links with long track records behind Dragonflies with weak links whose purpose is to protect the tow mast breakaway I totally agree with you.
I know of many HG pilots who no longer tow for this reason- they are wary enough of the conditions present or possible in a super-heated LZ but are unwilling to accept the additional risk when the added complexity of the tow is factored into the equation.
Fear of the focal point of their safe towing system? That's ABSURD! Everyone knows that the added complexity of a Davis Link pop can never result in anything more serious than a minor inconvenience. We know this because...
http://ozreport.com/forum/viewtopic.php?t=31052
Poll on weaklinks
Davis Straub - 2013/03/06 18:29:05 UTC
I'm happy to have a relatively weak weaklink, and have never had a serious problem with the Greenspot 130, just an inconvenience now and then.
...Davis has never had a serious problem with a Davis Link - just an inconvenience now and then.
In fact, There is a small group of experienced pilots at LMFP (and Henson's) that will not foot launch mid day - because no matter how soarable it looks, there is a distinct possibility that they will have to land in the superheated LZ sooner than they wish.
And those landings in the super-heated Happy Acres putting green LZs will have to be on their feet because if they aren't constantly working to perfect their flare timing they might not be able to land safely in the super-heated...
http://www.shga.com/forum/phpBB3/viewtopic.php?t=3858
Landing in the Big T wash
NMERider - 2013/04/05 21:09:27 UTC
There have been a number of bad landing incidents in the wash by a variety of experienced pilots because it is a dangerous bailout, period. It is NOT the club's landing zone either. It is a bailout and when it's hot on the surface it can and will bite you in the ass.
...Big T wash.
Especially on high pressure days and especially on light wind days, when thermals present could mean a 180 degree wind switch while you are on final (a thermal you yourself triggered, perhaps?) Strong & Variable, if you will. It's ironic that the best thermal soaring conditions frequently result in the worst launching/landing conditions here in the Southeastern US...
Yes. How ironic. Reminds me a lot of...
- whitewater kayaking - excellent rapids during spring flooding, minimum hydraulic danger during late summer droughts
- downhill skiing - great powder in February, lowest high speed impact avalanche dangers in late August
- surfing - biggest waves with hurricanes offshore, lowest riptide threat in flat calms
- mountain climbing - most spectacular views in the Himalayas, less danger of hypothermia and hypoxia in Florida
- horse racing - best times on Thoroughbreds, least risk of broken neck on Shetland Ponies
Idiot.
...(dammit! That's it- I'm getting some wheels!)
Oh. Like sailplanes use for landing when THEY fly in the best thermal soaring conditions there in Southeastern US. Maybe that's why we don't hear about them sitting out the best thermal soaring conditions. And maybe the fact that they use FAA legal weak links that don't break and don't have Dragonfly driver shitheads...
http://ozreport.com/forum/viewtopic.php?t=24846
Is this a joke ?
Jim Rooney - 2011/08/28 19:39:17 UTC
Weak links break for all kinds of reasons.
Some obvious, some not.
The general consensus is the age old adage... "err on the side of caution".
The frustration of a weaklink break is just that, frustration.
And it can be very frustrating for sure. Especially on a good day, which they tend to be. It seems to be a Murphy favourite. You'll be in a long tug line on a stellar day just itching to fly. The stars are all lining up when *bam*, out of nowhere your trip to happy XC land goes up in a flash. Now you've got to hike it all the way back to the back of the line and wait as the "perfect" window drifts on by.
I get it.
It can be a pisser.
...forcing them up on half G fishing line lets them further minimize the risks of:
- multiple takeoffs
- stalls
- emergency landings in thermal conditions
- time spent in the kill zone
The tow guys know this all too well, and that's why the LMFP tugs have the 914 Turbo option- to get the hell up and away A.S.A.P. with power to spare.
Yeah, must be nice to have...
http://ozreport.com/forum/viewtopic.php?t=24846
Is this a joke ?
Davis Straub - 2011/08/26 14:04:52 UTC
We had six weaklink breaks in a row at Zapata this year.
...power to spare. If only we could figure out some way to reliably transmit it to the gliders so they to could get the hell up and away ASAP. Any thoughts?
No, wait. Any thoughts in that area would just be more of...
http://www.chgpa.org/forums/viewtopic.php?f=2&t=2467
weak links
Jim Rooney - 2007/08/01 19:49:30 UTC
It's more of this crappy argument that being on tow is somehow safer than being off tow.
...that crappy argument that being on tow is somehow safer than being off tow.
When hearing horror stories like this latest fatality, I'm reminded of Mike Meier's excellent essay "Why Can't We Get A Handle On This Safety Thing? Loosely translated here; In mid-day, high pressure thermal conditions, anything can happen, and, over time, everything will happen.
Six times in a row occasionally. But that's just an inevitable side effect of using an appropriate weak link - like Wills Wing tells and its dealerships force us to do.
You may not ever be able to predict or prevent their occurrence, and you may not be able to react properly.
Hey, here's a thought...
http://www.hanggliding.org/viewtopic.php?t=26870
weak links
michael170 - 2012/08/17 17:01:40 UTC
Zack, let me see if I understand your logic.
You had a thing and it broke needlessly.
You didn't want the thing to break needlessly.
You replaced the thing with a stronger thing.
Now the thing doesn't break needlessly.
What if we replaced things that broke needlessly with things that DIDN'T break needlessly? Just kidding.
You can only choose the time you launch...
Right. All of your equipment choices have been made for by the tug driver who's appointed himself Pilot In Command of your aircraft and can use his weak link or dump lever to override a lot of choices you might have otherwise.
...or whether or not you will launch.
The lapse rate is UNBELIEVABLE today. Let's hang out at the picnic table and talk about parachutes until things smooth out this evening.
OR...
We could use towing equipment capable of safely handling the kind of flying we do. (Just kidding.)
You may be able to choose the moment you will land. Maybe...
I can maybe get a lot more choice about when I land if I can go up on a mid range weak link behind a fuckin' tug complying with fuckin' FAA aerotowing regulations.