Who is this Moron?
Yes I do fly the -700 and I guess we take energy management a little more serious at my company. We do 290 to .74. I don't feel one should get this airplane into a situation where you need to level for speed...especially when you're in the high 30's. That's just my conservative opinion. I guess I didn't explain myself enough, but it was the fact that I saw his airspeed at like .67 to .70 in the 30s. I mean seriously, that is way slow with this wing. You guys ever look at any of the turbulence charts showing minimum mach for a given altitude? Oh well. Next time I'll just keep my mouth shut like I did this time and wait for the shaker to do the talking.
DGdaPilot :
Who is this idiot? The -700 does just fine at 250 to .74. Do it all the time. As Weasil correctly posted earlier, 250 and .67 has nothing to do with anything, you moron! It has nothing to do with "energy on the wing" or "way too slow for the wing" - dude - do you use that line on the skanky flight attendants??? Oh, and at 290 to .74 you are burning more fuel, so unless you are at ORD, ATL, LGA, etc where you need to get the f out of dodge, 250 is just fine. Keep burning that fuel "dude" - costing your customer - mainline- money!
The transition to mach is a function of altitude and temperature - it will vary. Mach Number M = airflow velocity V/speed of sound a -
"...Because the property of air depends on altitude, flight speed ALONE IS NOT a reliable indicator of compressibilty effects. When referenced to the speed of sound however, a unique measure of altitude effects on aircraft aerodynamics is provided. This ratio of airflow velocity and speed of sound is termed Mach number..." - Jet Engines, K. Huneke ...
Translation for you DGda - the speed of sound varies with altitude because air density and temp. varies, therefore the IAS at which the transitions to certain Mach numbers will vary. Why do think profiles state 250/290 to .74 - if it was a set altitude the profiles would be 250/290 to FLXXX.
When you mention "too slow for this wing" - "...sweepback will delay the onset of all compressibility effects...sweepback will reduce the magnitude of change in the aerodynamic force coefficients due to compressiblity. Any change in drag, lift, or moment coefficients will be reduced by the use of sweepback...Thus the use of sweepback on a transonic (Transonic = Mach numbers from .75 to 1.20) aircraft will reduce and delay the drag rise and PRESERVE the maneuverability of the aircraft in transonic flight." - Aerodynamics for Naval Aviators, 1965...maybe you were talking about something else...
Any way you cut it DGda you obviously have no idea what you are talking about.
Oh, and while we are here, upgrading in 13 months at SKW is not nearly as scary as putting someone at 300 TT and 50 ME in a jet in a 121 environment. When a majority of those upgrading "fast" at SKW are coming from other 121 carriers and have plenty of experience. Just because we don't have smoking holes from the guys/girls flying around everyday with 300 hours doesn't mean it is a "safe" operation. And just because someone upgrades in 13 months doesn't mean it is "unsafe".
I would hands down fly with a captain who has had a fast upgrade at my current airline, but has had a lot of other experience, 121/135, than sit next to a 300 hr wonder. Not that I think that the 300 hr guy isn't smart enough or a good enough person, but he/she doesn't have the EXPERIENCE level. And of course having thousands of hours doesn't mean you will be a excellent pilot - however when the sh!! hits the fan, my confidence level that you and I as a crew can handle it is increased if I know that you have had more time in an airplane than the minimum hours to get your license. Just my 2 cents -
So, DGdaPilot in your words do all of us a favor ..."I mean seriously...Next time I'll just keep my mouth shut.."
"Never enter into a contest with a Sicilian when death is on the line."