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aeroexperiments
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PostPosted: Mon Mar 01, 2010 1:09 pm    Post subject: Control and navigation in the white room Reply with quote #1   
ttt

Last edited by aeroexperiments on Mon Apr 19, 2010 8:00 pm; edited 1 time in total
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aeroexperiments
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PostPosted: Mon Mar 01, 2010 1:10 pm    Post subject: Reply with quote #2   
ttt

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SkyPilot
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PostPosted: Mon Mar 01, 2010 1:22 pm    Post subject: Reply with quote #3   
welcome AeroExperiments to the .Org

Are you the AeroExperiments person of this site:

http://www.aeroexperiments.org/

I've enjoyed this site for some time now thumbsup

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PostPosted: Mon Mar 01, 2010 5:22 pm    Post subject: Reply with quote #4   
Instrument flying a weight shift glider in the white room does not sound like a pleasant pastime. Shocked ahh
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Paul H
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PostPosted: Mon Mar 01, 2010 6:32 pm    Post subject: Reply with quote #5   
There have been pilots who said that they could fly safely in white out conditions in the clouds using just a compass on their control bar, but that's hardly likely seeing as how that doesn't work in an airplane that is a lot more stable than a hang glider.
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PostPosted: Mon Mar 01, 2010 7:28 pm    Post subject: Reply with quote #6   
I've flown in clouds quite a bit - in a Quicksilver MX. I wouldn't do it in anything else. Eipper's Quicksilver design has/had a lot of dihedral in the main wing making it very roll stable. To make turns in a Quick required constant roll control input. Once you brought the stick (or your weight in a weight shift design) back to center you were flying straight. I never got vertigo either - even spending upwards of 10 minutes in clouds. Most of the time I also keyed off of where the Sun was at - lightness/darkness in the cloud. This worked well coupled with such a roll stable aircraft. And, of course, all clouds I flew in were well away from hillsides. However, the longer I was in the white room the more I pondered this Far Side cartoon....


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aeroexperiments
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PostPosted: Thu Mar 04, 2010 7:41 am    Post subject: Reply with quote #7   
ttt

Last edited by aeroexperiments on Wed Aug 11, 2010 1:57 pm; edited 2 times in total
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PostPosted: Thu Mar 04, 2010 8:17 am    Post subject: Reply with quote #8   
i have flown in the white room.When im in the white room i never pull in to much if at all.If you are pulled in,you could be doing wingovers and loops and not even know it.My 6030 gives me my direction and i always fly to the front of the cloud to ridge soar up the side of it.Never get into the white room when there are developing cu nims close by.I prefer the small cotton ball types,with no one around.
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PostPosted: Thu Mar 04, 2010 9:30 am    Post subject: Reply with quote #9   
ChattaroyMan wrote:
. However, the longer I was in the white room the more I pondered this Far Side cartoon....


That is a friggin brilliant far side
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PostPosted: Thu Mar 04, 2010 10:37 am    Post subject: Reply with quote #10   
Flight instrumentation for hang gliders is getting closer then you may think. These are for skiing but could be suited for flight with only minor changes.

http://www.zealoptics.com/transcend/

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PostPosted: Thu Mar 04, 2010 11:42 am    Post subject: Reply with quote #11   
I've been lucky so far by using the following guidelines after inadvertently climbing into a cloud:

1. slow to trim or just a little bit faster...not too fast
2. return body position to center of the bar

That should have you flying in a more or less straight line

3. don't make any roll inputs

That should allow you to hold the heading you're on

A compass or GPS can help you to make tiny little heading changes to fly a straight line...but it's really difficult to keep it any more than +/- 15 degrees in either direction

4. wait until you pop out the side

It's a scary feeling and not fun at all. Even more so if there were other gliders in the thermal with you or there's a mountain back there somewhere.

I've flown with pilots who were very nonchalant about it and would even launch into a cloud bank, certain that they'd pop out the other side of the relatively thin clouds within seconds of launch.

Not for me, thanks.

I think the biggest mistake you can make after whiting out is trying to dive out of the clouds. At high speeds, the gilder is so much more sensitive to roll and pitch inputs that it's going to be virtually impossible to fly a straight line. Any little turn is going to increase the wing loading and contribute to your own spatial disorientation, causing you to make it worse with further, incorrect control inputs.

I just read a report of a pilot who tried that method and broke the glider, coming down under his reserve. Lucky for him the lift wasn't stronger or he'd have gone UP under his reserve, dragging the broken glider behind him!

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PostPosted: Thu Mar 04, 2010 11:48 am    Post subject: Reply with quote #12   
It sounds like one of the tricky problems of flying blind is not knowing your current roll angle. Are there no instruments that provide an artificial horizon? At the very least a bubble level would tell you if you're level or rolled to one side or the other, right?
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PostPosted: Thu Mar 04, 2010 11:55 am    Post subject: Reply with quote #13   
I used the same method as JohnPeace. The cloud I was in, had mild turbulence in it. Whenever a wing got bumped up making a turn, I would turn in the opposite direction for the same amount of time. I popped out of the cloud over Highway 1 at Big Sur permanently cured of flying in clouds.
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johnpeace
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PostPosted: Thu Mar 04, 2010 12:03 pm    Post subject: Reply with quote #14   
It's an extremely easy thing to avoid.

So easy, in fact, that it's a timewaster to imagine all of the techniques, gear and instrumentation one might use to make sure they can do it successfully if it's ever required.

Just stay out of the clouds, there...problem solved!

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PostPosted: Thu Mar 04, 2010 12:24 pm    Post subject: Reply with quote #15   
Derakon wrote:
At the very least a bubble level would tell you if you're level or rolled to one side or the other, right?


Nope. For the same reason your hang strap remains tight at the top of a loop. Same reason you can't tell your attitude by spitting or hanging a rock on a string beneath you.

In a perfectly coordinated turn the bubble level would remain centered. In an uncoordinated turn it could indicate just about anything.

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PostPosted: Thu Mar 04, 2010 12:39 pm    Post subject: Reply with quote #16   
zippidy wrote:
Derakon wrote:
At the very least a bubble level would tell you if you're level or rolled to one side or the other, right?


Nope. For the same reason your hang strap remains tight at the top of a loop. Same reason you can't tell your attitude by spitting or hanging a rock on a string beneath you.

In a perfectly coordinated turn the bubble level would remain centered. In an uncoordinated turn it could indicate just about anything.


I dont' think that's quite true.

You're describing the bubble level as a turn-coordinator or slip/skid indicator.

But a bubble level has a bubble of (lighter) air suspended in (heavier) fluid.

The physics you're describing are all indicated by a heavier bubble suspended in a lighter fluid.

Think about it: centrifugal force won't overcome the bubble rising to the high end of a bubble level. You can try it out by holding a bubble level so it's pointing slightly down and away from you. The bubble will rise toward you. Now turn around in a smooth 360deg turn and note where the bubble goes. It remains pegged to the high end of the level.

The mass of the air bubble isn't enough that centrifugal force would overcome it's buoyancy.

On the other hand, if the pilot were using a plumb-bob, your examples would all hold true.

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PostPosted: Thu Mar 04, 2010 1:44 pm    Post subject: Reply with quote #17   
So far no one has mentioned: FAR Part 103.23 Flight visibility and cloud clearance requirements. Myself and many others have been reamed for posting videos of cloud flying which we all promptly removed and/or edited.

A bubble level is as useless as a plumb bob in a white out.

A GPS breadcrumb track can save you if you are inadvertently whited out so completely that the sun and Earth are no longer differentiated from the rest of the sky. Just make small corrections and keep an eye on the little icon. Bear in mind that the path of the icon can be delayed so stay on top of it.

if the GPS fails or malfunctions a cheap ball compass for $1 from Walmart can also save your skin. Just keep an eye on the ball inside the compass. If the ball starts to turn left then you need to chase it until it stops turning left. Simple as that. Stay ahead of it and you can avoid going into a spiral dive. AKA: Death Spiral.

I do not endorse cloud flying. Please follow the FARs! In certain conditions I have had clouds form underneath me faster than I could dive below the forming layer. If I was unable to remain a legal distance above the clouds and/or had to get down, then through the clouds I must go. It happens.

Be prepared and above all don't panic.
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zippidy
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PostPosted: Thu Mar 04, 2010 2:41 pm    Post subject: Reply with quote #18   
johnpeace wrote:
The physics you're describing are all indicated by a heavier bubble suspended in a lighter fluid.


It's the same physics. The heavier object/fluid points away from the net acceleration vector, the lighter fluid points towards it. The buoyancy force vector is entirely dependant on acceleration (normally gravity). When your flying and turning there are significant accelerations in addition to gravity (and in different directions).

johnpeace wrote:

Think about it: centrifugal force won't overcome the bubble rising to the high end of a bubble level. You can try it out by holding a bubble level so it's pointing slightly down and away from you. The bubble will rise toward you. Now turn around in a smooth 360deg turn and note where the bubble goes. It remains pegged to the high end of the level.

The mass of the air bubble isn't enough that centrifugal force would overcome it's buoyancy.


Your analogy is good, but you have it backwards. Hold the level so it points up slightly away from you so that the bubble is away from you. Now spin in a circle and the bubble will point towards you. The heavier liquid will move into the far end of the level forcing the air towards you.

Or, to use my original anology, get in a glider and place a level 90 deg to you so that the bubble is facing up towards you. Now execute a proper loop (positive g's the whole way) and you will see the bubble remains pointing towards you the entire time. Even when you are upside down.

I'm probably not very good at written explanations, but this really is fundamental physics. A bubble level (which depends on gravity to work) can not be used to indicate which way an aircraft is turning.

It can be (and is) used to indicate if your turns are coordinated or not.

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Last edited by zippidy on Thu Mar 04, 2010 3:46 pm; edited 1 time in total
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PostPosted: Thu Mar 04, 2010 3:18 pm    Post subject: Reply with quote #19   
johnpeace wrote:
It's an extremely easy thing to avoid.

So easy, in fact, that it's a timewaster to imagine all of the techniques, gear and instrumentation one might use to make sure they can do it successfully if it's ever required.

Just stay out of the clouds, there...problem solved!

Thank You!


I spend a fair amount of time flying in clouds: legally. The FAA says I'm ok to do it and my experience says as much. I would prefer not having to worry about psychos in hang gliders trying to play in my sandbox. You wanna fly in the clouds..get an FAA pilot license and an instrument rating. PERIOD. This topic is inappropriate at best. Forget about it.

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PostPosted: Thu Mar 04, 2010 3:29 pm    Post subject: Reply with quote #20   
Feathered1 speaks with great wisdom.
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