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#21
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Orval
what are you flying - a comanche ? Orval Fairbairn wrote: In article , "G.R. Patterson III" wrote: Dale wrote: I come down a little faster than you though, normally around 3000-3500fpm. G If I try more than about 1,000 fpm, the CHTs get out of the green on the low side pretty quick. George Patterson A woman's perfect breakfast occurs when she's sitting at the table sipping gourmet coffee while looking at pictures of her son on the cover of Sports Illustrated, her daughter on the cover of Business Week, her boyfriend on the cover of Playgirl, and her husband on the back of the milk carton. I always keep at least cruise power on when descending, until I descend low enough to maintain 2300/23", gradually enriching the mixture as I descand. I like to start descent 20-40 miles out, letting the speed increase, to make up for speed lost in climb. With normal cruise about 150 mph IAS at 10000, I can build up to about 170-180 MPH on descent (no worry, because redline is 230 MPH). That way, there is no spiralling down at destination or cylinder cooling. |
#22
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"Wayne" wrote in message news 1 mile high is a pressure of around 12.2 PSI. so dropping from 5280' to sea level (14.7 PSI) (splash) would make a 2-1/2 PSI increase in pressure. If you did that in 1 minute, then that would be 5280 FPM decent rate. Compare to S.C.U.B.A. It's not that hard on the ears. In sea water, every 33 feet is equal to 1 atmosphere of air (14.7PSI) A realitively fast decent (2 minute) 132' would be like dropping around 23-1/2 times faster or 124,000 FPM A 58.8PSI increase in less than 2 minutes and it's not that hard to do. Anyone seen that girl that did that free dive to, I forget 500 feet deep or some crazy amount like that? Try it with a cold and it can get real uncomfortable though. The trip back up is where you need to go slowly or risk the bends. Won't happen in a free dive. This is a result of taking a breath from some depth (as little as 4 feet down) and then not exhaling when returning to the surface, or staying at a certain depth for a long period of time and not using decompression stops on the way back up :-) I have only ever dropped fast like that a few times in a plane. What's that equal out to in a 160 nmph dive? I never realized an altimeter could move that fast. What a great picture though. Next time I go far away, I will have to hold the altitude, and get a shot like that. Yours turned out very well. That was through a window? Wayne Benefits of a big head, I guess. ;-) You routinely descent at 3500 feet per minute, Ben? My ears never bother me in normal flight, but dropping *that* fast might cause someone some pretty severe discomfort. -- |
#23
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"John E. Carty" wrote in message
.. . The trip back up is where you need to go slowly or risk the bends. Won't happen in a free dive. This is a result of taking a breath from some depth (as little as 4 feet down) and then not exhaling when returning to the surface The "bends" result solely from too rapid an ascent, whereas holding your breath is a problem no matter how slowly you ascend. The two are both dangerous, but are not the same thing. Otherwise, your point is accurate as far as I know. Pete |
#24
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"Jay Honeck" wrote in message news:DS_ib.770859$Ho3.201262@sccrnsc03...
Don't your ears bother you? One thing I noticed when I started flying was that my ears stopped popping after about 20 hours. I thought it was normal to get acclimated, but when I mentioned it to some other local pilots they said they all still have to clear their ears. Benefits of a big head, I guess. ;-) You routinely descent at 3500 feet per minute, Ben? My ears never bother me in normal flight, but dropping *that* fast might cause someone some pretty severe discomfort. Couple of things; You think 10.5 seems high? Try spending 300 hours or so not getting above 600 agl, then going up to the "high" altitude of 1200'! When I looked at the altimeter, it hit me that, hey, I used to think this was LOW altitude. And this was just from a summer towing banners. I can only imagine what those Ag pilots think! Two, a friend of mine used to fly jumpers in a King Air. Surface to 14,000 and back in about 10 minutes, most of it in a climb. He had to be going down over 6000 fpm. After a few hundered hours of that, his ear drums had so much scar tissue on them that they wouldn't 'seal' enough to cause pain. Don't know how true it was, but that's what he told me, only way I can think of he could manage to do that day after day. -- Mike |
#25
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In article ,
"G.R. Patterson III" wrote: If I try more than about 1,000 fpm, the CHTs get out of the green on the low side pretty quick. MP just above bottom of the green, RPM bottom of the green or a little lower, lean to peak. -- Dale L. Falk There is nothing - absolutely nothing - half so much worth doing as simply messing around with airplanes. http://home.gci.net/~sncdfalk/flying.html |
#26
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In article 9I_ib.130302$%h1.131919@sccrnsc02,
"Jay Honeck" wrote: I come down a little faster than you though, normally around 3000-3500fpm. G Crikey! Don't your ears bother you? Eh, valsalva on way down. Skydivers in freefall are doing 10000 to 12000 fpm. -- Dale L. Falk There is nothing - absolutely nothing - half so much worth doing as simply messing around with airplanes. http://home.gci.net/~sncdfalk/flying.html |
#27
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Won't happen in a free dive. This is a result of taking a breath from some depth (as little as 4 feet down) and then not exhaling when returning to the surface, or staying at a certain depth for a long period of time and not using decompression stops on the way back up :-) Not entirely accurate, but close. Freediving rarely results in bends (aka DCS, decompression sickness), as you a point out. The other condition (DCI, decompression illness) includes "overexpansion injury", or poppin' a lung in the vernacular. This also rarely affects freedivers as the volume in their lungs decreases with depth, and expands back to near the original volume upon ascent (unless they cheat and take a hit off a scuba tank at depth.) Breathing compressed air at depth really loads up your tissues with nitrogen, putting one at higher risk. But the root cause of DCS is the nitrogen coming out of solution (your tissues) too rapidly, no matter what the amount or where it came from. People can and do get bent (DCS) freediving. --Matthew |
#28
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On Tue, 14 Oct 2003 22:35:15 GMT, Jay Honeck wrote:
You routinely descent at 3500 feet per minute, Ben? My ears never bother me in normal flight, but dropping *that* fast might cause someone some pretty severe discomfort. Funnily enough, it's never bothered me when slower descents have. When towing gliders for a busy glider club, I used to find some sink and spiral down in the sink. I could get the VSI (+-6000 feet/min model) to peg down if I did that. Never bothered me in the slightest. Nor did spins which have a similar descent rate in the planes I've done them in. However, slow descents make my ears pop! -- Dylan Smith, Castletown, Isle of Man Flying: http://www.dylansmith.net Frontier Elite Universe: http://www.alioth.net "Maintain thine airspeed, lest the ground come up and smite thee" |
#29
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On Tue, 14 Oct 2003 20:17:03 -0400, G.R. Patterson III
wrote: Dale wrote: I come down a little faster than you though, normally around 3000-3500fpm. G If I try more than about 1,000 fpm, the CHTs get out of the green on the low side pretty quick. If you're coming down because you need to come down without letting the CHTs get too low, you can always spiral (that's what we did when towing gliders behind a Pawnee). The best spiral technique I found for the Pawnee was this. The plane has quite a lot of dihedral, so I made the higher wing almost perpendicular to the horizon and pulled, maintaining Va. 6000fpm down was easy (particularly in sink). The main problem was glider up, spiral down, glider up, spiral down on a hot day got tiring very very quickly even for someone in their 20s and in good physical condition. I made some of my worst landings in my poor C140 after flying home after a day of glider towing. At the club I tow for now, things aren't nearly as hectic and we also have a winch, so I just enjoy the view and make an unhurried power descent. -- Dylan Smith, Castletown, Isle of Man Flying: http://www.dylansmith.net Frontier Elite Universe: http://www.alioth.net "Maintain thine airspeed, lest the ground come up and smite thee" |
#30
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On Wed, 15 Oct 2003 02:04:38 GMT, Mike Rapoport
wrote: Well, the hill behind my house in NV is over 10,600'... Ah, but you cheat. You have turbines and pressurization :-) -- Dylan Smith, Castletown, Isle of Man Flying: http://www.dylansmith.net Frontier Elite Universe: http://www.alioth.net "Maintain thine airspeed, lest the ground come up and smite thee" |
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