http://www.hanggliding.org/viewtopic.php?t=27518
Pro Tow
Stephan Mentler - 2012/11/06 14:18:14 UTC
Pensacola
I have finally made the transition from the 3-point tow to pro tow.
Without ever having had to learn that there's no such thing as three point or pro tow. Is this a great country or what!
I fly a Moyes Litesport 4. I found the bar pressure a little higher but the roll control much easier.
Are you SURE about this? According to Ryan...
http://www.hanggliding.org/viewtopic.php?t=11519
Aerotowing methods
Ryan Voight - 2009/04/13 22:22:13 UTC
If you get off to the side of the tug, the v-bridle dampens how far over your shoulders get pulled (see above), but also pulls over on the glider, so you only have to do half as much correction, the other half is done for you.
...you've got a lot better roll authority flying two point because the bridle also pulls over on the glider, so you only have to do half as much correction. The other half is done for you.
How 'bout trying this little experiment...
- Lose the weak link.
- Tie a heavy rag on the bottom end of the bridle to prevent it from clearing the tow ring.
- Go up nice and high.
- Turn away from the tug.
- Release from the bottom end.
With ALL of the tow force going to the glider you shouldn't hafta do ANY correction. All of it will be done for you. (Make sure your parachute is in good shape just in case Ryan's as totally full of shit on this as he is on most other things.)
I know for some this creates the potential for PIO...
Yeah, talk to Holly about that.
...but for me it has made it much easier to track the tug in midday thermal conditions.
- You have all of the tow tension routed through you so you "weigh" more and have more control authority per inch of control movement - but you're using proportionally more muscle to effect it.
- How much trouble were you having tracking the tug before?
- So now you have better roll control at the expense of increased vulnerability to oscillation, worse pitch control, increased bar pressure, loss of upper speed range, higher probability of being killed if you get hit by a thermal or dust devil low. Super.
If you fly an advanced double surface glider consider making the change.
Great, Stephan. You're a pro now so you can start advising other people to toss away the tops of THEIR speed ranges.
The link to a short video of my first pro tow flight with some instruction that I received from Mitch Shipley at Quest Air is below.
Glad your experience was better than PJ's - so far.
He actually briefed a bit more but I did not get that on video...
See if you can get him to do a reshoot. I so do enjoy getting stuff he says on the record.
...however, what is there, summarizes the approach well.
Yeah, hard to beat top notch instruction like that. See if you can sit in on one of his weak link failure recovery seminars sometime.
Glad to see that Mitch has got you squared away on...
http://www.hanggliding.org/viewtopic.php?t=27393
Pro towing: 1 barrel release + weak link or 2 barrel release
Juan Saa - 2012/10/18 01:19:49 UTC
Boca Raton
The normal braking force in pounds for a weak link is around 180, at least that is the regular weak link line used at most aerotow operations. By adding a second weak link to your bridal you are cutting the load on each link by half, meaning that the weak link will not break at the intended 180 pounds but it will need about 360.
If that is what you use and is what your instructor approved then I have no business on interfering, i dont know if you are using the same weak link material but there shoul be only ONE weak link on a tow bridle for it to be effective in breaking before higher loads are put into you and the glider should the glider gets to an attitude or off track so much that the safety fuse of the link is needed to break you free from the tug.
I made the same mistake on putting two weak links thinking that I was adding protection to my setup and I was corrected by two instructors on separate occacions at Quest Air and at the Florida RIdge.
...weak link configuration. You sure don't wanna have 180 pounders on BOTH of your (inaccessible bent pin) Bailey releases.
Congratulations, Stephan. You're now pro aerotower.
Now you'll never need:
- a glider attachment point and the upper speed range having one allows you to retain
- more than 260 pounds of tow tension in any imaginable situation
- the ability to reliably stay on tow to get pulled / climb out of a dangerous situation
- a weak link which:
-- meets the FAA minimum rating
-- can be counted on to hold through a normal tow in benign conditions
- reliable weak link protection
- a bridle which can reliably clear the tow ring
- a release that:
-- can be actuated under emergency conditions
-- meets minimum USHGA capacity standards
Now you should start working on your:
- standup landings till you get good enough to be able to chuck your wheels
- loops till you get good enough to be able to chuck your parachute