Hydraulic Winch Tows - Safety
GoIllini - 2011/04/11 20:45:16 UTC
Guys,
My instructor is thinking about doing some hydraulic winch towing as part of getting us to Hang 2. I'm pretty comfortable with foot launches from the training hill, but I am a little concerned with the potential for lockout in hydraulic winch towing.
Does anyone have any experience with this? Also, are there any other risks I have to be aware of that aren't involved with foot launches?
I've got a great instructor, but I got a couple second opinions before I decided that foot launches were an acceptable risk. Just wanted to do the same for hydraulic winch towing.
Thanks!
- Who gives a rat's ass how experienced he is? There are tons of highly experienced people in this game who should be treated like plutonium.Dennis Wood - 2011/04/11 21:07:50 UTC
Suffolk, Virginia
how experienced is your instructor with the type of towing involved. if he is not totally comfortable and knowledgeable, go somewhere where there are peeps what do it regular like. towing ain't like footlaunch. and don't let anyone tell you it is.
- If he's totally comfortable in hang glider towing - or any other flavor of aviation - avoid him like the plague.
- Good freakin' luck finding someone more than about a third knowledgeable.
Problem - Dead people don't right thank you notes. (And if they do they don't have theirs posted on the bulletin board.)GoIllini - 2011/04/11 21:22:48 UTC
He built his own system about ten to fifteen years ago and ran it big time out of an up until three or four years back - has a number of thank you notes about hydraulic winch towing posted on his bulletin board, but he hasn't done it in a few years.
It's absolutely astounding that people like this get Hang One ratings - let alone instructor tickets.He seems pretty confident about it. He is pretty darned sure that lockout is "impossible" on a hydraulic winch tow because you basically guarantee a constant tension on the line once you set the tension, "unlike scooter towing and truck towing, even aerotowing".
I trust the guy -
"NEVER trust ANYONE in hang gliding" should probably come right after "ALWAYS assume you are NOT HOOKED IN" in rules to live by in our sport.Zack C - 2010/12/13 04:58:15 UTC
I had a very different mindset too back then and trusted the people that made my equipment. Since then I've realized (largely due to this discussion) that while I can certainly consider the advice of others, I can't trust anyone in this sport but myself (and maybe the people at Wills Wing).
He's probably just as likely to kill you there. Flip a coin.I just wanted to get a few other thoughts about how safe this really is and whether I should really be pushing him for the 300 foot training hill instead.
You're serious, aren't you?Dennis Wood - 2011/04/11 21:31:45 UTC
wow. that must be one really good setup if lock-outs are impossible.
Yeah, peanuts... The smart people in this sport recognize that the standup landing is actually only good for emergency landings.i'm glad that he does have experience w/ tow and teaching it to a student pilot. towing is a good way to get in a lot of landings in a session. USE WHEELS in case of less than stellar launches. i don't think wheel landings teach anything other than an emergency technique.
Take a look at Boy Oyng's account of his foot launch stationary winch training experience and decide whether you want to have fun or take off and land on your feet.have fun.
I'm starting to really like this person.Diev Hart - 2011/04/11 21:43:32 UTC
Santa Cruz, CaliforniaBIG FLAG tells me no way would I tow with him......He seems pretty confident about it. He is pretty darned sure that lockout is "impossible" on a hydraulic winch tow because you basically guarantee...
I trust the guy- ...
Nevertheless... Sorry Diev, telling people to keep control of their gliders on tow and get good at releasing early is about as useful as telling them to always remember to hook in and to never hit an oncoming car that's just swerved into your lane.Keep control of your glider (keep foot launching and leaving the ground on your own) (don't let someone (like this) pull you...yet)...
Towing is so much different from foot launching...but if you are going to be towing after this learning then...maybe...just please be ready and get good at releasing early...
Really just my thoughts...
And kill you before you can blink.Mike Lake - 2011/04/11 22:13:35 UTC
UK
If there is enough tension to get you up, there is enough tension to get you locked out.
That pretty much eliminates all his US towing options.If done incorrectly you can equally screw up a tow/hill/ramp or cliff launch.
If done correctly it is a fantastic way to get airborne.
Don't focus all you attention on the dreaded lockout - other things are equally or more important.
Sh** rigged releases, no wheels, weak-links that dump you when you are that feet up to name but a few.
Bullshit. Lockouts are very rarely the result of improper technique and almost always the result of the same shit that throws free flying gliders temporarily out of control. They can and do happen at any time the air's worth towing up into and to anybody - no matter what it says on his card or where he's listed in the competition standings.bagbgone - 2011/04/11 22:48:05 UTC
Santa Cruz, California
I'm with Diev and others. I earned my H2 on a similar tow setup. I probably towed up sixty times or so.
It can be a great way to get airtime when you are learning if done properly (way less breakdown and hiking time involved).
Lockouts are a result of improper technique and can happen on any tow setup.
One element of which - with virtually all of the equipment widely available - is the ability to control a locking out glider with one hand. So denial is also a biggie.While the ride down is pure flying the ride up is not and requires a slightly different skill set.
Yes. Haven't we all.I had a few exciting moments learning on tow.
- Yeah, the Voight/Rooney Technique. Good one to have in your quiver - if you're a big fan of Voight/Rooney Shitrigged Releases.Once the release was wound up and would not release as I passed over the pulleys. I had to do some unnatural flying to get it to break away rather than get pulled back to the ground.
- I seem to have heard of an incident three months and two days ago but I can't quite place it.
Lemme guess... Florida Ridge? They should take a hint from Ridgely and leave all three tires totally flat all season from about April on.Another time I had a wheel blowout on the cart we were using, sending me skidding at 20 mph or so while prone.
Moral of the story. It works, but there is more going on, and more to be prepared for as a beginner. If you asked me if I wanted a free day of towing now, I'd probably pass, I know too much and foot-launching is readily available around here, safer, and simpler flying.
Note also - despite everything you've ever heard - that the weak link didn't blow to keep things safe.Bob Flynn - 2011/04/12 01:53:15 UTC
Jacksonville, North Carolina
My first flight was a scooter tow that resulted in a lockout. I didn't have any muscle memory trained into me yet so when the glider went right, I went along for the ride until I realized "hey, wait a minute, I'm supposed to correct for this". By that time it was too late. Result: one severely bent downtube and one bruised ego. I got lucky. Any towed wing can go into lockout.
- Complexity tends to get a bad rap in hang gliding - sometimes it's bad, sometimes it's good. A release mechanism with a reverse tapering gate - like the one on our sacred spinnaker shackle - is, relative to one with a uniform gate, bad. A glider with wheels is more complex than one without - do the math.Jason Rogers - 2011/04/12 04:43:38 UTC
Port Macquarie, New South Wales
I *personally* feel that towing is outside my comfort zone now. I've got experience on both ends of the rope but it's just too scary for me. Too complex, too many cooks, too many things that can go wrong over which the pilot (or winch driver) has little or no control.
- Relative to slope launching... Some of the aspects of towing add dangerous complexity, others subtract it. I'd say that on the balance you are or can be better off on the flats on that issue.
- The ACTIONS required for a foot launch are a lot more complex and dangerous than those required for a dolly or platform launch.
- You only need two cooks, although it's often useful to have a fairly harmless waiter at launch. After the glider starts moving you DEFINITELY don't want any more than two cooks and the other one DEFINITELY has to know what he's doing - but he doesn't hafta be a rocket scientist and you're almost always free to take him out of the equation at any point you feel like it.
- With heavy weak links and the proper engineering you have or can have a lot more control over the things that can go wrong than is usually the case the way things are normally conducted.
If they're launching off of platforms and dollies they almost certainly blow away the free flight record.John Fritsche - 2011/04/12 03:10:44 UTC
Lompoc, California
Many years ago, when I was more fearless, I did around twenty static line truck tows. They all went great and I thoroughly enjoyed it. Now I would be too chicken to do any ground-based towing for the reasons mentioned above. But you'll find a lot of people with a lot of successful experience with every type of towing. Tow-launch pilots who are really on the ball probably have a safety record comparable to foot launchers.
Also realize that if you do rolling launches and landings there's a lot of reduced complexity and there are now trees, rocks, or cliffs around. (And you can set up, take off, and land next to your car.)If you go for it, just realize that there is an added degree of complexity.
People don't get fucked up in towing because they're not meticulous and anal about procedure and failing to follow checklist. People get fucked up in towing because their meticulous and anal procedures and checklists include shitrigged equipment, light weak links, and default tension dumps and having everybody assume that everybody's hooked in at the moment of launch.Be very meticulous and anal about procedure, and be sure everyone else involved is too. Follow a checklist.
I'm not buying glider design and perfectly good payout winches have around since the dawn of civilization.Casey Cox - 2011/04/12 14:43:54 UTC
Eastern North Carolina
Golllini,
I have never foot launched and have only platform launched and aero towed, so I can not compare but I can give you my two cents.
Lockouts use to occur more often than now even though lockouts still happen. Some reasons for lockouts are: the glider was towed too fast as with a trike, pilot not reacting to tow force fast enough, glider being towed instead of pilot and glider or pilot through harness, pilot induced oscillation, and towing angle too great. Most lockouts have been eliminated by: aero tugs that fly slower than a trike, proper training, towing from pilot though harness, gliders designed for towing to eliminate yaw, new payout winches.
If the pressure's constant the tension won't be.It seems there are two launch methods for platform towing and may differ with the type of winch. (1) tow up with constant pressure...
If he never goes how's he ever gonna get ready?...at almost constant angle. (2) pay out more line than altitude gain for low angle, then slow tow to payout less but increase angle and altitude. It seems your instructor is proficient towing with his type of winch.
I'm not trying to make it sound complicated, it's just more checks and something new to you. I think today I would be less concerned with a lockout than making sure to steer clear of the line retrieval kite. You already know how to fly the glider so it's just the delivery into the air that is different. But it's like anything else; if your instructor or you think you are not ready then don't do.
Or just land on your wheels so that you don't need to practice landings and will increase your odds of coming through the sport with your downtubes and arms intact for a few years.Towing will open up more sites and opportunity for flying as well as the opportunity to do more sled rides to practice landings.
Don't get too chummy. Always remember Survival Rule 2:One of the best things about towing is you see others' takeoffs, flying, and landings. I think a tow park has good camaraderie, easier to pack up glider and meet more pilots.
Never trust anyone in hang gliding.
A release lever an the basetube can occasionally make it up there with tits on a bull as well.By the way; my very first flight was solo by platform boat tow. I prevented a lockout at 150 feet by releasing the tow line. I'm not proud of this fact and consider myself lucky but do not think it would have happened if I had flown before either by solo foot launch or tandem.
The two most useless things; altitude above and landing field behind.
Yeah, it's always when people are doing the opposite that it seems to become a problem.Devin Wagner - 2011/04/12 22:36:44 UTC
Yankton, South Dakota
peanuts lockouts are almost impossible on my rig. ive tried to do it
- Why aren't there universal/international standards for tow operation signals consistent with sailplaning that every operator is required to have down one hundred percent before he gets his ticket?Allen Sparks - 2011/04/13 03:22:20 UTC
Evergreen, Colorado
There are more things to consider than lockouts. Plenty more.
I'll list a few more things to consider.
What is the checklist for this tow operation? If there is no checklist, don't tow. If there is a checklist, is it adequate?
What are the signals between the operator and pilot?
- What's your signal for "I did a hang check in the setup area fifteen minutes ago so hit the gas already."?
Does the operator or launch assistant have clear visibility of the pilot's carabiner?Does the operator have clear visibility of the pilot?
Yeah. DEFINITELY. Have a hook knife (on orange one) and always be ready to start hacking away. That's saved SO MANY tow pilots from the instant death they would've otherwise experienced. If only Shane had been ready with a hook knife.Are you using radios for in-flight signals?
Make sure the operator has hook-knife in hand and is ready and willing to cut the line. Do you have a hook-knife and will you be ready to cut the line in the event of a failure to release?
Well OBVIOUSLY, Spark - shitrigged. Why else would we be having this idiot discussion about hook knives?What type of release are you using?
OF COURSE IT COULD!!! And WILL!!!Could it fail to release?
http://ozreport.com/forum/viewtopic.php?t=22660
What can be learned from this "scooter" towing accident?
It's just a fundamental truth of hang gliding that it's impossible to make a release that works as well as a VG system. If it could be done everybody would be using them.Jim Rooney - 2011/02/06 18:35:13 UTC
The minute someone starts telling me about their "perfect"system, I start walking away.
You deaf or something? Yeah, these things ALWAYS malfunction in multiple ways. Besides, if everybody is using half G weak links (like you are) how come we're the least bit concerned about whether or not it releases prematurely?Could it release prematurely?
And what do you think the half G weak link and hook knife are there for?Is there a backup release?
For a Wallaby release? How much bandwidth do I get?Ask yourself ... what could go wrong? and make a list. Expand the list.
http://ozreport.com/9.009If something can go wrong ... it will.
2005 Worlds
And WHEN it does at altitude we go to our backups. And WHEN things finally all line up right down low we ban the mechanism, at least for a short while, wait until everybody settles down a bit, and then put it back up and continue ignoring the frequent failures at altitude.Davis Straub - 2005/01/11
Rohan Holtkamp did an analysis of the accident, in particular the bridle and weaklink, which never broke. The weaklink was caught on the release mechanism, a standard spinnaker release found on bridle systems used at Lookout Mountain, Moyes, Wallaby Ranch, and Quest Air. The release clamp has an arm that is thicker at the release point and this held onto the weaklink which consisted of multiple loops of thick line.
This type of release mechanism has been banned (at least for a short while) from the Worlds at Hay.
Yeah, the operation NEEDS TO. Good luck finding one that actually DOES.Tow operations can be a great way to get airtime. The operation needs to have a good procedure (checklist), good equipment, good operator and crew (i.e. attendant).
Yeah, the tow operation WAS missing some key safety elements - a launch dolly and a procedure which precludes the driver from touching the gas unless the pilot's connection to the glider has been positively confirmed the INSTANT before.I don't want to dissuade you from towing, just to point out some of the safety considerations.
I have a friend who was badly injured in a tow operations that was missing some key safety elements - thus my emphasis.
But your friend has been missing some key safety elements since he started flying in the Seventies. And the fact that you didn't say anything worth hearing after Yossi bought it last weekend and aren't addressing the issue now either are indications that you are too.
I agree with about half of that. I hardly know of any that I'd trust.There are tow operations I will participate in and those I would not.
Speak of the devil...Jim Gaar - 2011/04/13 05:37:23 UTC
Roeland Park, Kansas
(my emphasis on "almost")...ALMOST impossible...
So then, as has been said, they are possible on any rig.
Hi Zack. How come nobody told me about this one? (Maybe you could try to get this guy over here when you have a moment.)Zack C - 2011/04/15 03:26:18 UTC
Houston
After over a hundred each of hill/mountain launches, aerotows, and surface tows, I feel that platform launching is the safest way to get a hang glider into the air.
Well, the global communication SHOULD be easy. But you've got fingers belonging to people like Davis and Jack on the buttons - so we DO get the same "mistakes" are made and repeated every few years.Mike Lake - 2011/04/15 13:09:47 UTC
In many instances hill flying is a bit more of an individual thing, whereas towing is a team event and generally a bit more 'regimented'.
A good tow setup with good procedures in place can (and does) compensate for any extra gotchas. This is most important.
Tow launching is now by far my preferred method of launch.
Poor equipment/techniques and/or lack of good procedure. This is what makes 'normal' HG pilots a bit suspect of towing. We see time and time again people getting hurt or worse because, despite easy global communication, the same mistakes are made and repeated every few years.
A platform launch IS a pop start. That's why - as Zack says - it IS the safest way to get a hang glider into the air.Casey Cox - 2011/04/15 15:23:15 UTC
One would be surprised how prevalent towing has been and still is. The east coast has many platform tow pilots. Many live on lakes or rivers and have never had a rating. Cypress Gardens and Epcot had shows as well as many ski clubs in the East and Wisconsin that used gliders in ski shows.
There is a friend in my home town that started out boat towing around '82 with the ski rope paying out of a laundry basket and doing pop starts. He then got an old Cypress Gardens winch. He flew around the Statue of Liberty around '83. I don't think he has even done a platform launch because he is so use to pop starts.
Nah, it pretty much peaked out about twenty years ago and then started creeping back down as the people who've never had any original ideas in their lives started replacing all the pioneers.He did have a ballistic chute on his harness. That's just the way things were done, just like pilots used to fly without a chute at all.
Towing has gotten safer through the years...
And here I am thinking that if the flight parks weren't controlling the instruction and ratings a little common sense might start filtering into the environment and things might start improving again....just as HG in general has gotten safer.
I think more pilots would platform tow if winches were more reasonably priced.
I'm not advocating reckless flying, non-instruction, or not getting ratings but just making a statement.