News from HangGliding.org

Syndicate content Hang Gliding Org
Updated: 20 hours 43 min ago

Hang gliding general :: RE: Adjusting reflex bridles and sprogs for sail shrinkage

25 May, 2017 - 02:41
Author: aeroexperiments
Subject: results
Posted: Wed May 24, 2017 6:41 pm (GMT -8)

I ended up using 11/16" spacers between the ball at the bottom of each reflex bottom and the bottom of the sail (1/2" would probably have sufficed), and I turned each sprog out (longer) 11 half-turns or 5.5 full turns-- looks like I'm now within the guidelines given in the 2009 Sport 2 manual--

The first time I adjusted the sprogs I didn't notice the note in the manual that each full turn of the sprog should raise the sprog about half an inch-- and I went WAY too far-- !! Well I know now how much you have to turn it to make it fall off--!

Steve

Hang gliding general :: RE: Adjusting reflex bridles and sprogs for sail shrinkage

25 May, 2017 - 00:21
Author: aeroexperiments
Posted: Wed May 24, 2017 4:21 pm (GMT -8)

With the reflex bridles already adjusted as noted above (1" spacers), If I shove 2 2x4 blocks (actually each 1.5" thick, total 3" thickness) between each sprog and the tranverse batten, that gets the string between the two battens just inboard of sprogs the right height above the keel. Wow, do I really have to raise each sprog by 3", as measured near the transvere batten? That sounds extreme.

Source of recommended measurements-- 2009 Sport 2 manual--

http://willswing.com/wp-content/uploads/manuals/S2_5th_May_2009.pdf

Hang gliding general :: RE: Adjusting reflex bridles and sprogs for sail shrinkage

24 May, 2017 - 23:48
Author: aeroexperiments
Subject: Re: Adjusting reflex bridles and sprogs for sail shrinkage
Posted: Wed May 24, 2017 3:48 pm (GMT -8)

Now I added a 1" spacer between the ball at the bottom of each reflex bridle and the bottom of the sail-- for right now I'm using heavy surgical tubing split lengthwise to fit over the reflex bridle wire--

new results--


String between batten tips nearest reflex bridles passes 4 11/16" (was 3 7/16"-- difference of 1 4/16") above the keel- -recommended setting is no less than 4"

String between battens just inboard of sprogs passes 4 2/16" (was 3 10/16"-- difference of 8/16") above the keel-- the recommended setting is no less than 5 5/8"

I'm a little surprised that the spacer lifted the sail by MORE than the height of the spacer-- seeing as the reflex bridle comes in to the sail at about a 30-degree angle (i.e. about 60 degrees from vertical), I thought the sail would be only raised by about half of the length of the spacer (because sine of 30 degrees is .5) -- guess I'm missing something about the geometry--

If adjusting the reflex bridle length also affects the measurement most relevant to the sprogs (string stretched between batten tips just inboard of sprogs), then I suppose adjusting the sprogs will also have an effect on the measurement most relevant to the reflex bridle (string stretched between batten tips just inboard of reflex bridle--

Which to adjust first? The reflex bridle I suppose--

Steve

Hang gliding general :: Adjusting reflex bridles and sprogs for sail shrinkage

24 May, 2017 - 22:54
Author: aeroexperiments
Subject: Adjusting reflex bridles and sprogs for sail shrinkage
Posted: Wed May 24, 2017 2:54 pm (GMT -8)

There's no doubt my sail of my Wills Wing Sport 2 has shrunk quite a bit-- see related thread " Hang Gliding Org Forum Index -> Hang gliding general->How would you solve this? -- Sport 2 battens too tight"

http://www.hanggliding.org/viewtopic.php?t=35234

After installing the modified batten tips I'm checking the settings of my reflex bridles and sprogs.

String between batten tips nearest reflex bridles passes 3 7/16" above the keel- -recommended setting is no less than 4"

String between battens just inboard of sprogs passes 3 10/16" above the keel-- the recommended setting is no less than 5 5/8"

Yikes!

(note-- edited now to reflect proper measurements-- VG full on-- had it off before)

Steve

Hang gliding general :: RE: How would you solve this? -- Sport 2 battens too tight

24 May, 2017 - 22:47
Author: aeroexperiments
Subject: Re: progress
Posted: Wed May 24, 2017 2:47 pm (GMT -8)

aeroexperiments wrote:
There's a little more to the story-- one of the old flip-tips broke inside the batten as I tried to unscrew it but I was able to carefully drill it out and pick out the pieces without damaging the threaded insert much. (I tried using a bolt extractor but it didn't work.) For some reason one of the modified ones is also now sticking so if it breaks as I try to adjust it, I may have to repeat the operation one more time.

Another one of the modified batten tips just jammed up. Oddly, both of the modified tips that jammed were the smallest thread diameter out of the three slightly different thread diameters I made (slightly different settings of the set screw in the adjustable die.) It appears that when the threads are too small, the batten screws in easily but then if you try to screw it out all the way, things are prone to getting off kilter when the old unmodified threads start feeding into the threaded insert.

I replaced it and everything seems to be working well now. I put some oil on the batten tips before screwing them in this time.

To drill out the jammed flip-tip, I started with a 1/8" drill bit and then worked up to 9/64", 12/64", and 15/64". Again, minimal or no damage was done to the threaded insert and I was able to clean it out with a 7mm x 1 mm tap and put in a new flip-tip.

A related bit of trivia-- it can happen that the die can pass over the old threads without modifying them, and yet when it starts cutting new threads, they are slightly smaller diameter than the old threads. That doesn't quite seem to make sense, but it was definitely happening.

When working with an adjustable die, you definitely want to test each modified flip-tip as you make it. If it doesn't fit well in the batten you intended it before, maybe it will fit in another batten. You don't want to accidentally make a whole much of modified flip-tips that end up being slightly the wrong size!

Steve

Hang gliding Videos :: RE: 1-axis gimbal footage?

24 May, 2017 - 18:41
Author: dbotos
Posted: Wed May 24, 2017 10:41 am (GMT -8)

DMarley wrote: Hey Dave,
That appears to be nearly perfect! How does it perform at slower roll rates as would normally be flown within typical, non-aerobatic flight?

Doug,

Thanks! I was pleased that it worked that well for as simple as the math is (straight subtraction). It was good with slower roll rates from what I can recall. I'll try to remember to do some slow and some fast in the next video. I've got the platform almost done to put the IMU on the rotor side.

David

Hang gliding general :: RE: prius as glider car

24 May, 2017 - 18:10
Author: red
Subject: prius as glider car
Posted: Wed May 24, 2017 10:10 am (GMT -8)

tizon wrote: I tied a ladder to my 1991 Honda CRX.No problems! Campers,

Man, that will be some hefty overhang lengths, both front and rear. Better check with the local LEOs about what your legal limits will be there, for overhang lengths. It's a safety thing, so don't expect to talk them out of a ticket twice.

If a red flag is required on long loads there, the oldest trick in the HG arsenal is to sew the required size and color of flagging right across the end of the glider bag. Any home sewing machine can do that, using UV-proof upholstery thread. The fabric stores will have all that stuff. Then you always have the flagging in place on the road, no worries.

I like the pool noodles on the ladder rungs. For strong winds, or even just passing trucks on the freeway, you might want crossing ropes to the bumper ends, from the ladder ends. I'd slip pool noodles (at a minimum) on the verticals of the ladder, to protect the paint on the roof of the car.


_________________
Cheers,
........Red.........................
Pssst! New pilot? Free advice, maybe worth the price,
http://www.xmission.com/~red/
H4, Moyes X2, Falcon Tandem, HES Tracer, Quantum 'chute

Hang gliding Videos :: Low Save @ Amber Hills/Harrison Mtn Out-Landing

24 May, 2017 - 17:27
Author: NMERider
Subject: Low Save @ Amber Hills/Harrison Mtn Out-Landing
Posted: Wed May 24, 2017 9:27 am (GMT -8)

Tuesday was a day that did not live up to the rosy forecast but still provided an interesting little X/C flight with an unusual low save that I manged to blow after drifting 2-1/2 miles. Just was well since I was dressed for near-freezing temperatures and was working my ass off in mid-90°F heat for what seemed like an eternity. Gotta love a good drogue chute as it gives me landing options that allow for some unusual lines and routes. Enjoy!


Link

_________________
http://www.youtube.com/glidela

Hang gliding general :: RE: Sail Craft Questions

24 May, 2017 - 16:48
Author: peanuts
Posted: Wed May 24, 2017 8:48 am (GMT -8)

First issue sounds like a tension problem

Hang gliding Videos :: RE: Hang & Para PR Video?

24 May, 2017 - 16:20
Author: aeroexperiments
Posted: Wed May 24, 2017 8:20 am (GMT -8)

aeroexperiments wrote: Just heard that one of the launches "near" (3-4 hours drive) me will be closed for 3-4 days or so someone can make a movie. Be careful what you wish for.

Turns it out was a paragliding-only movie. The word went out that all recreational flying was banned during the filming but my understanding is that some paraglider pilots were allowed to fly recreationally anyway. I don't know the extent to which that happened so take that with a grain of salt. At any rate the movie was about paragliding so now we have a wonderful paraglider-only movie. Can't wait to see it...

Hang gliding general :: RE: Bank angle and time to complete a 360

24 May, 2017 - 15:41
Author: NMERider
Posted: Wed May 24, 2017 7:41 am (GMT -8)

Jason wrote: NMERider wrote: Jason wrote:


thats only true up to 45 degrees, once you exceed 45 degrees the diffrence in tip speeds starts to decrease, by the time you get to 70-80 degrees the difference is nearly 0. Isn't >45° just a little bit beyond most relevant soaring conditions?

NMERider wrote: The tightest measure climbing turn I have ever done in my T2C 144 were 58' in diameter at an estimated 70° bank angle and at ~44mph. Sadly, the shorter projected wing spans and slower thermalling speeds of modern comp PGs allows then to get better established in most cores and they climb right through me as if I were pole-sitting. But I live and fly in a high pressure environment which makes for some very skinny thermals.

also your math doesn't add up
58 foot diameter=29 foot radius, 44mph=65 fps
a=v^2/r, for a lateral accelration of 4.5 gees

70 degrees of bank produces 2.92 felt gees and 2.75 lateral gees.

for the math to work you'd have to be around 78 degrees- for a felt gee load of 4.8 gees

i don't have the video of it now, but i remember flying the G103 and i obviously wasn't at 90, but it sure felt that way, maybe 70-75, with the stick fully back in my lap and going up with the vario pegged.

sometimes the steeper you bank the faster you climb
I was inside an extremely tight bullet thermal with cascading edges. In other words the air was neither liner nor was it level. The so-call math ignores the reality of the conditions that result in such a climb.
_________________
http://www.youtube.com/glidela

Hang gliding general :: RE: TIME WILL TELL.

24 May, 2017 - 15:29
Author: Eteamjack
Subject: Recovery
Posted: Wed May 24, 2017 7:29 am (GMT -8)

Dear Roadrunner,
I know the feelings you are experiencing. I recently blew a launch at the E. My injuries were pretty severe, but apparently not as bad as your incident. I too have been relegated to driver duty. I probably could return to flying status in about a year. Problem is im 71 yrs old and cant ask my body or family to endure another possible accident. Fortunately I was able to acquire 38 yrs of priceless flying experiences without injury. Everyday I struggle with my decision to walk away. I
Totally miss the comraderie of the Eteam. They've all been there for me since the accident helping to raise my spirit. Im currently searching for another activity that I can be passionate about. My hopes are for your full recovery and return, but if it doesnt happen move on and find another love.

Best Wishes

Jack
_________________
H4 (1979) Lake Elsinore. Ca. U2 160 (Sweet)
"If Your One Who Doesn't Succeed At First Maybe Hanggliding's Not For You"

"Don't take life seriously it isn't permanent"

Hang gliding general :: RE: prius as glider car

24 May, 2017 - 15:00
Author: Rick M
Posted: Wed May 24, 2017 7:00 am (GMT -8)

There are a few threads for Prius racks already. You will find good info here:

http://www.hanggliding.org/viewtopic.php?t=28724

http://www.hanggliding.org/viewtopic.php?t=32805

http://www.hanggliding.org/viewtopic.php?t=29585

And there is the Wiki page:

http://www.hanggliding.org/wiki/Car_Rack
_________________
Rick
Hang 3 - WW U2 160
FL - ST - FSL - AT - TUR

"Once you have flown you will walk the earth with your eyes turned skyward, for there you have been, and there you long to return" -- Leonardo da Vinci

Hang gliding general :: RE: Bank angle and time to complete a 360

24 May, 2017 - 14:56
Author: Jason
Posted: Wed May 24, 2017 6:56 am (GMT -8)

NMERider wrote: Jason wrote:


thats only true up to 45 degrees, once you exceed 45 degrees the diffrence in tip speeds starts to decrease, by the time you get to 70-80 degrees the difference is nearly 0. Isn't >45° just a little bit beyond most relevant soaring conditions?

NMERider wrote: The tightest measure climbing turn I have ever done in my T2C 144 were 58' in diameter at an estimated 70° bank angle and at ~44mph. Sadly, the shorter projected wing spans and slower thermalling speeds of modern comp PGs allows then to get better established in most cores and they climb right through me as if I were pole-sitting. But I live and fly in a high pressure environment which makes for some very skinny thermals.

also your math doesn't add up
58 foot diameter=29 foot radius, 44mph=65 fps
a=v^2/r, for a lateral accelration of 4.5 gees

70 degrees of bank produces 2.92 felt gees and 2.75 lateral gees.

for the math to work you'd have to be around 78 degrees- for a felt gee load of 4.8 gees

i don't have the video of it now, but i remember flying the G103 and i obviously wasn't at 90, but it sure felt that way, maybe 70-75, with the stick fully back in my lap and going up with the vario pegged.

sometimes the steeper you bank the faster you climb

Hang gliding Videos :: RE: 1-axis gimbal footage?

24 May, 2017 - 11:47
Author: DMarley
Posted: Wed May 24, 2017 3:47 am (GMT -8)

Hey Dave,
That appears to be nearly perfect! How does it perform at slower roll rates as would normally be flown within typical, non-aerobatic flight?

Hang gliding general :: RE: prius as glider car

24 May, 2017 - 10:58
Author: tizon
Posted: Wed May 24, 2017 2:58 am (GMT -8)

I tied a ladder to my 1991 Honda CRX.
No problems!
_________________
thermalcowboy.com

Hang gliding general :: RE: Bank angle and time to complete a 360

24 May, 2017 - 10:31
Author: Charlie Romeo
Posted: Wed May 24, 2017 2:31 am (GMT -8)

Hi again Waveview,well i guess there's not much for me to add from the good and varied advice you have garnered here except to say as many before me said too...to always fly with some helpful experienced mates who are willing to be watchful as you happily expand your skill set.A good mate on the ground is an even better mate in the air.You learn a lot after many decades of hg and we shouldn"t mind passing on our tricks and tips and stuff ups! A lot may hear but only some will listen .If an up and coming pilot out flys me in years to come i figure i"ve done a good job The two excellant links posted by Piano Man were the only two i read, however the in depth discussion by James Freeman was spot on...ps I tested my Brauniger 6005 IQ+ at three quarters sensitivity and it over ran for about one to one and a half secs.

Hang gliding general :: RE: Blown wingover leads to deployment south of Funston

24 May, 2017 - 05:36
Author: TjW
Posted: Tue May 23, 2017 9:36 pm (GMT -8)

AIRTHUG wrote: Did you just say (or infer) Mitch McAleer isn't a hang glider pilot?
https://www.facebook.com/AIRTHUG/videos/vb.1337779113/1045226014388/?type=2&theater

holy $*%&^()#

I'm pretty sure of two things: Mitch is a hang glider pilot, and if I were interested in doing scareobatics, I'd listen to his opinion on that subject over lots and lots of other people.

Hang gliding general :: TIME WILL TELL.

24 May, 2017 - 05:34
Author: Roadrunner
Subject: TIME WILL TELL.
Posted: Tue May 23, 2017 9:34 pm (GMT -8)

Yes, Here I sit at my Desk just typing away. I am a wounded Predator Pilot who is Pinning to once again Fly my Beloved Predator 158. But my recovery has, and will be a long one. I am paying my dues. For I go flying with my Friends where I am The Assistant To The Driver. When I get my License back I will step up into the Drivers seat where I will be: {THE DRIVER} AS to flying my Predator again. I guess it is like when Doctors have been asked about my recovery? They would say: {TIME WILL TELL}

Hang gliding general :: RE: prius as glider car

24 May, 2017 - 04:47
Author: Odakyu-sen
Subject: Re: prius as glider car
Posted: Tue May 23, 2017 8:47 pm (GMT -8)

jany77 wrote: I was wondering if anyone has Toyota prius converted to carry a glider ,if so I would like to see some pictures before I try to come up with somethink on my own thank you

I know a guy who uses a Prius to carry his glider. I will ask him for a photo.