Once 20 degrees flaps are selected, adjust engine power to between 6,500 and 6,700 RPM, depending on your expected landing speed (VAT roughly between 115 kts to 125 kts). You can keep the same engine power all the way down, using the flaps to lower your speed. As a rough guide flaps 20 dig = 175 kts, 30 deg = 150 kts, 40 deg = 140 kts, 60 deg = 130 kts, 80 deg = 120 kts.
For me with a Comet IVC at 104.000 pounds for 116 kts at threshold the power setting is too low even when already descending on the ILS. 6800/ 6900 RPM works better. Flaps 80 selected at 100 ft AGL.
Post by aerofoto - HJG Admin on Jan 1, 2022 17:57:07 GMT
"For COMET IV only" (not the -IVB or IVC) .... and flying with maximum payload only as well .... I've calculated TO/climb, cruise, decent, and approach to landing performance and handling to be as quoted below and per "SECTION 5.00" of our own current forum based manual .... tonymadgehjg.proboards.com/thread/9974/dh106-comet-manual
REMEMBER .... the FDE currently supporting the COMET's (and ONE-ELEVEN's also) is still the last version DMFS data and "NOT" that I've been re-working and which isn't quite complete.
REMEMBER ALSO .... due to their simulated weights (as currently compiled by DMFS) the performance and handling for each these COMET simulations "DOES" vary .... and as should be the case. This variance will mostly be noticeable per the power settings required in order to maintain a specific performance.
What we offer later .... FDE-wise .... will/should somewhat further improve performances .... including other aspects of performance not yet commented by Walter
In the meantime .... on final approach, with a full payload but not more than 20% total fuel remaining, and subject to the influences/drag of both flap (per increments) and landing gear extension also, I've recorded that throughout the approach to landing power will need to be varied from RPM 6400 (at FLAP 20) to RPM 7000 (at FLAP 80/FULL FLAPS) in order to acquire a VAT airspeed of 117/118 KTS. Power settings "are not" constant and do need to be manipulated/adjusted (increased/decreased slightly .... as required) throughout the approach to landing.
My experience and observations are mostly in line/agree with Walter's .... except I find myself using slightly more power during the last stages/s of the approach to landing.
5.00: "RECOMMENDED MGW LOADING/TO/CLIMB/CRUISE/DESCENT/APPROACH TO LANDING PROCEDURES".