





I'll tell you how.
I just talked with Joe, and he said that hang checks do have limited usefulness in protecting against hook-in failures...
...and that their value in that regard decreases with the time between the hang check and the launch (he's absolutely correct here).
1977/08/19
Dick Stark
50
Wills Wing SST 100 B
Fraley Mountain, Washington
Hooked in, then unhooked to adjust an instrument, forgot to hook in again. Stark apparently hung on all the way to impact several minutes later.
He also said that doing a hang check the moment before launch...
...was just as good as a hook-in check at launch...
...but that a hang check can catch things that a hook-in check might not (like a hang strap routed around a down tube, as just one example).
So your claim that hang checks aren't needed by pilots who use the same glider/harness combination is invalidated right there.
Well then, I guess you were "totally" wrong.
As Joe pointed out, if the hang check is done immediately before launch, it's just as good as a hook-in check.
In fact, I don't know of anyone who argues against that statement.
Zack - 2010/11/10
We discussed FTHI at the meeting tonight. From my perspective, this seemed to be the consensus:
- We need to help each other more.
- There is no difference between a hang check and a hook-in check.
- Checking your connection status five minutes before you launch is no less acceptable than two seconds (and five minutes probably qualifies as 'just prior' for USHPA's ratings).
- It is preposterous to suggest that hang checks are dangerous.
- The Aussie method is one way to prevent FTHI.
Those there can add to or correct this recap as necessary.
Actually, Tad, I don't even understand what you're arguing about...
...and coming up with solutions.
You're taking pot-shots at people you don't know (like Rob McKenzie) without checking any facts.
You're misquoting people (like Joe Greblo)...
...without going to the source and just asking him.
As far as I can see, you're just wasting our time here.
I will do my best to discuss any topic with the members of this forum, but there's a lot of other work that I have to do as well.
Thanks again for all your good points.
Tell me if my thinking on this is wrong from a physics point of view.
I think that having my shoulders (fulcrum) as high up the down tubes as I can get them gives me more mechanical advantage keeping my glider's nose down, in case of a gust, than having my shoulders lower on the down tubes. (During the lift and tug.)
Then pick it up and launch.
I feel I have greater handling control (roll and pitch) over my glider this way.
As a side note I prefer to do my hang check on the last level spot closest to the ramp as I can get to reduce the time on cliff's edge while hooked in.
Having said all that, if we feel we can improve on any standard, then that's something that we should work to do. It would help our ability to get insurance (our biggest stumbling block) if we can show that we're even more safety conscious than USHPA.
Jim Rooney - 2011/06/12
Most common HG injury... spiral fracture of the humerus.
flyin_canuck - 2011/03/01
Nothing creates carnage like declaring a spot landing contest.
With regard to your launch question, I've also found that it can be difficult to use the "lift and tug" in high winds or other situations where control of the glider is difficult. Maybe that's more of a self-critique of my own launch skills than anything else, but it's what I've experienced.
TadEareckson wrote:3. Oh goodie! If it's just as good then we don't hafta do the hated hook-in check!
TadEareckson wrote:bobk wrote:As far as I can see, you're just wasting our time here.
OK, I'll call off my goons and tell them to stop forcing people to read everything I write.
Tad, your comments ("What's a safe delay period?", for example) reveal that you don't understand the concept of safety.
Everything is "more safe" or "less safe" than something else.
So thirty seconds is "more safe" than two minutes which is "less safe" than 5 minutes.
A lift and tug is very safe in light wind conditions, but it can be difficult or even dangerous in other conditions.
At some point, there's a trade-off where doing a visual hook-in check 30 seconds ago and concentrating on the launch is safer than trying to incorporate a "lift and tug" into the launch.
I never said that. Joe Greblo never said that.
And I will agree with you that someone who's done a hang check MAY be less likely to do a proper hook-in check.
In those cases, a hang check provides an additional degree of safety (along with the fact that it catches additional failure modes as Joe noted).
JBBenson - 2009/01/25
I get what Tad is saying, but it took some translation:
HANG-CHECK is part of the preflight, to verify that all the harness lines etc. are straight.
HOOK-IN-CHECK is to verify connection to the glider five seconds before takeoff.
They are separate actions, neither interchangeable nor meant to replace one another. They are not two ways to do the same thing.
I haven't seen you do that yet.
But I don't want to keep reading page after page of anecdotal evidence sprinkled with your opinions.
Please start by presenting your best crack at an FTHI model both with and without a hang check.
He also said that doing a hang check the moment before launch was just as good as a hook-in check at launch, but that a hang check can catch things that a hook-in check might not (like a hang strap routed around a down tube, as just one example).
TadEareckson wrote:I think I've broken enough in the way of aluminum tubing, fiberglass, and bone and spent enough time in trees, stretchers, and emergency rooms and on front pages of newspapers to make total nonsense of that statement.
TadEareckson wrote:3. I STILL have yet to hear a single instance of a lift and tug having negative consequences.bobk wrote:At some point, there's a trade-off where doing a visual hook-in check 30 seconds ago and concentrating on the launch is safer than trying to incorporate a "lift and tug" into the launch.
Cite a SINGLE incident which supports that statement or, failing that, gimme a hypothetical situation.
JBBenson - 2009/01/25
I get what Tad is saying, but it took some translation:
HANG-CHECK is part of the preflight, to verify that all the harness lines etc. are straight.
HOOK-IN-CHECK is to verify connection to the glider five seconds before takeoff.
They are separate actions, neither interchangeable nor meant to replace one another. They are not two ways to do the same thing.
TadEareckson wrote:bobk wrote:I haven't seen you do that yet.
What happened to "U", "H", and "N"?
TadEareckson wrote:bobk wrote:Please start by presenting your best crack at an FTHI model both with and without a hang check.
Try this for the time being...
TadEareckson wrote:I'm afraid I was way more impressed with the Joe Greblo Christian was talking about than the one with whom you were just talking.
I'm not against opinions, but then we have to include all opinions ... not just yours.
Weak links have greatly improved the safety of towing over the years.
Weak links very clearly will provide protection from excessive angles of attack, high bank turns and the like for this form of towing.
I was flipped over on launch when I was a hang 2. I had my hands full (obviously more than full) just trying to control the glider ... let alone attempting to let it just "lift and tug" without pulling me off my feet.
Earlier this year I was flying at Torrey when I witnessed a friend of mine get blown over on launch (broken bones ... healing nicely as I've heard). That was while he was doing his level best to just control the glider.
Do you want to add more tricks for people to perform on a tricky launch?
...and he's saying exactly what Joe has taught us.
He also said that doing a hang check the moment before launch was just as good as a hook-in check at launch...
How can you use that quote in an argument where you're trying to eliminate hang checks?
HANG-CHECK is part of the preflight, to verify that all the harness lines etc. are straight.
Are you ready yet?
That's not the "science" you claim to support.
That's because you wanted to see what you wanted to see.
To him, a hang check is part of the preflight and has no value in confirming that you are hooked in at the moment of launch.
The hang check is more the problem than the solution.
It subverts the pilot's responsibility to perform a hook-in check.
He also said that doing a hang check the moment before launch was just as good as a hook-in check at launch...
Now do you want to explore building a model of this problem or not?
I'm not saying that as an insult, but just to let you know that I've got other things that I have to do.
TadEareckson wrote:Now do you want to explore building a model of this problem or not?
You build the model but make it a good one. My hammer's ready and I'm pretty good at knocking things down with very light taps in just the right places.
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