performance questions on lear60

Discussion of topics related to corporate aviation throughout the world.

Moderators: ahramin, sky's the limit, sepia, Sulako, lilfssister, North Shore

Post Reply
Message
Author
glass1/2full
Rank 1
Rank 1
Posts: 36
Joined: Tue Nov 23, 2010 8:57 pm

performance questions on lear60

#1 Post by glass1/2full » Wed Feb 25, 2015 1:14 pm

for the guys and gals that fly the lear60 and or XR,
is max cruise M.81 ?
is .81 the norm between 350 to 450 or do you find it more often then not when above fl 410 you are in the 0.77 to 0.79 range?

I understand depending on the flight and or range, weight of the a/c to allow it to get up above 450 etc.
whats the average Mach number you guys flight plan for, on average 1500 to 2000 miles missions ?

reason I ask, been working on a program for some time and came across some glitches with Mach limit when ISA is around -5 to -10. its putting the mach number above .81 example

ISA -10
FL 380 M.82 and TAS 453 (based on TAS chart below) NOT FROM AFM
FL 430 M.83 and TAS 447 (based on TAS chart below) NOT FROM AFM

this is what I am using for the TAS table, but trying to fix the formulas to limit Mach number when ISA is around-5 to -10 above fl400


I do not have an AFM nor do I fly the lear 60, nor do I know anyone that flies the 60 and thats why I am on here asking, i checked on line and got few different numbers
some indicate norm 0.81 max cruise which I cant tell at this point if .81 is MMO or just max Cruise. and others indicate 0.75 to 0.78 is the norm profile for 1500 to 2000 miles.

NRC LRC NRC LRC
10 253 253 1568 1568
20 257 257 1561 1561
30 261 261 1554 1554
40 264 264 1547 1547
50 269 269 1540 1540
60 272 272 1513 1513
70 277 277 1485 1485
80 281 281 1458 1458
90 284 284 1430 1430
100 384 344 2080 2080
110 389 351 2076 2075
120 390 356 2072 2070
130 395 361 2068 2070
140 401 366 2064 2065
150 407 372 2060 2060
160 413 376 2058 2060
170 419 382 2056 2055
180 424 388 2054 2055
190 432 395 2052 2050
20 437 400 2043 2045
210 441 406 2034 2035
220 451 412 2025 2025
230 457 419 2016 2015
240 464 424 2007 2005
250 471 433 1998 1950
260 474 438 1989 1885
270 472 444 1980 1825
280 470 452 1945 1760
290 468 450 1910 1695
300 466 448 1875 1630
310 464 446 1840 1590
320 462 444 1805 1550
330 459 442 1770 1505
340 457 440 1735 1465
350 455 438 1700 1420
360 453 436 1663 1390
370 453 435 1625 1355
380 453 435 1585 1350
390 453 435 1545 1340
400 453 435 1505 1320
410 453 435 1465 1295
420 450 435 1393 1285
430 447 435 1320 1270
440 441 435 1275 1215
450 435 435 1230 1160
460 435 432 1175 1110
470 435 428 1120 1060
480 435 425 1070 1035
490 435 421 1020 1010
500 435 418 985 985
510 435 415 950 950
---------- ADS -----------

PHD
Rank 1
Rank 1
Posts: 27
Joined: Tue Aug 31, 2004 10:12 pm

Re: performance questions on lear60

#2 Post by PHD » Wed Feb 25, 2015 2:08 pm

Alt, TAS, TAS, then whats 4th and 5th column ? is that burn ?

I think your biggest restriction will be weight to get up in the mid 400. most likely burn an hour or two of fuel then step climb to mid 400.
---------- ADS -----------

glass1/2full
Rank 1
Rank 1
Posts: 36
Joined: Tue Nov 23, 2010 8:57 pm

Re: performance questions on lear60

#3 Post by glass1/2full » Thu Feb 26, 2015 1:58 am

yes that is burn, for both low cruise and norm cruise

I do realize the fuel burn for weight restriction to allow to get higher, but strictly speaking speed limit only.
are you confirming that MMO is .81?
---------- ADS -----------

Post Reply

Return to “Corporate”