Regional Jet Replacement
Join Date: Jun 2001
Location: Brisbane
Posts: 135
Likes: 0
Received 0 Likes
on
0 Posts
You guys are right, of course. I was thinking IAS.
Doh.
Having said that, using my usually (?) trusty whiz-wheel I calculate that M0.79 at FL350 on an ISA day equates to a TAS of 445, while M0.72 on the same day at FL310 (can the 146 get to 350?) is 410 knots.
Certainly not a 70 knot difference, but 35 is still fairly big.
Also, how long does it take for a 146 to get to Top of Climb? I'd be happy to guess that it takes a good deal longer than it does for a 717 and perhaps that might then increase the average TAS difference between the two on a given sector.
Have I dug an even bigger hole for myself, or will someone agree with me this time?!?
Doh.
Having said that, using my usually (?) trusty whiz-wheel I calculate that M0.79 at FL350 on an ISA day equates to a TAS of 445, while M0.72 on the same day at FL310 (can the 146 get to 350?) is 410 knots.
Certainly not a 70 knot difference, but 35 is still fairly big.
Also, how long does it take for a 146 to get to Top of Climb? I'd be happy to guess that it takes a good deal longer than it does for a 717 and perhaps that might then increase the average TAS difference between the two on a given sector.
Have I dug an even bigger hole for myself, or will someone agree with me this time?!?
Last edited by 2daddies; 13th Oct 2002 at 22:42.
Join Date: Jul 2002
Location: The dark corner of the bar
Posts: 351
Likes: 0
Received 0 Likes
on
0 Posts
Those figures are reasonably close 2dadds. Also, you dont need a can of airfreshener when flying the 717. Best of luck to those who are currently on the fumeagator!
Join Date: Aug 1999
Location: Well it's an IRS nowdays, but the AHRS were fun.
Posts: 108
Likes: 0
Received 0 Likes
on
0 Posts
As a quick & rough rule just is multiply yer M# by 6 to get TAS. Use 38.94xSqroot of the temp in Kelvin to calculate LSS then LSSxM#=TAS.
