But "braking with care" is part of the test. Even some of the tricycle undercart light aircraft will groundloop, without the "care" bit.
Gerry Winskill F FISHER wrote:
ThanksI thought it was me, using reverse thrust seems to be a bit drastic though, and with diff brakes, even braking in a straight line has to be done with care (should use the keyboard brake there I suppose, that should keep it straight) Frank F------------------------------------------------------------------------ *From:* Fossil <fossil@xxxxxxx> *To:* jhb@xxxxxxxxxxxxx *Sent:* Tuesday, 28 July, 2009 8:00:15 PM *Subject:* [jhb] Re: Getting too realYou can’t keep any turboprop down to reasonable taxi speed because they all produce too much thrust at flight idle. In real life you have to decide whether to use brakes all the time (expensive) or let speed build up to fast taxi and then pull the levers into the beta range – you are working at this all the time.I was allowed to taxi a Commander 690 once and it fairly leapt off the blocks when brakes were released. You constantly had to use reverse thrust to slow it down.bones bones@xxxxxxx <mailto:bones@xxxxxxx>*From:* jhb-bounce@xxxxxxxxxxxxx [mailto:jhb-bounce@xxxxxxxxxxxxx] *On Behalf Of *F FISHER*Sent:* 28 July 2009 19:30 *To:* jhb@xxxxxxxxxxxxx *Subject:* [jhb] Re: Getting too realFor normal ops you should taxi with the RPM and Mixture levers fully forward and just use throttle for speed control (steering also in twins). On take off you apply the throttle to the book valuesThanks BonesThat is roughly what I have been doing with the C172. But not known about adjusting rpm and mix during the climb, but the C172 is a fixed prop anyway.One other problem I have to sort, the high taxi speed of the Beech 350, basically stop/go to keep down to a reasonable steerage speed. Tried with different rpm and mix settings, to no avail. Even adjusting the control sensitivity. Left alone it becomes uncontrollable.Frank F------------------------------------------------------------------------ *From:* Fossil <fossil@xxxxxxx> *To:* jhb@xxxxxxxxxxxxx *Sent:* Tuesday, 28 July, 2009 6:43:46 PM *Subject:* [jhb] Re: Getting too realI can only give general values as there are always exceptions. For example you can’t leave mixture at 100% for taxy or take off from high altitude airports because the engine will be too rich and you have to lean for max power.For normal ops you should taxi with the RPM and Mixture levers fully forward and just use throttle for speed control (steering also in twins). On take off you apply the throttle to the book values – this may be full throttle but on turbocharged engines you may have an MP limit. Once established in the climb you reduce power, rpm and mixture to climb values (in the Aztec this was 24”/2400 and 16gph). As you climb the air will get thinner and MP will drop so you need to check this every 1000ft and increase throttle as required to keep the MP up. Eventually you will be back at full throttle and from that point on further climb will see the MP fall off.Once in the cruise you reduce power, RPM and mixture to published cruise figures. Again in the Aztec this was 22”/2200 and 10gph. For a gradual descent we never touched any levers as the CSU keeps RPM adjusted automatically. However, if descending from high altitude you need to watch mixture as this will get weaker as you descend. If you touch the power at all during the descent you need to set mixture and RPM before touching the throttle. As you approach the airfield you should have mixture back up to max and throttle/RPM at approach settings. During the approach the RPM should be increased to maximum so that if you have to go around you can apply full throttle without hurting the engine.bones bones@xxxxxxx <mailto:bones@xxxxxxx>*From:* jhb-bounce@xxxxxxxxxxxxx [mailto:jhb-bounce@xxxxxxxxxxxxx] *On Behalf Of *F FISHER*Sent:* 28 July 2009 17:23 *To:* jhb@xxxxxxxxxxxxx; jhb@xxxxxxxxxxxxx *Subject:* [jhb] Getting too realSo have I got it right.For takeoff/climb to cruiseAll levers full, (pitch fine and mix rich) then reduce power to set climb rate.At cruiseSet power, then rpm, then mixture, for eco cruise.For descentSet power for descent rate.For landingLeave rpm and mix as set for cruise?, or set levers to full ? ie fine pitch and rich. (I have been setting the levers full on)Please correct as needed.NoteI find that FSX planes, do not seem to perform as spec, ie I do not get the rated speeds and fuel comsumption, dispite numerous tests. In fact, I have been playing around with the AC config files to get the performance as stated. ( now got the C172 maxing at 140kts, 70% throttle giving the rated 100 cruise, hopefully without compromising on the consumption, the B727 needs a bit of work too, only get 2/3 thirds the stated range). Will have to have a go at the B58 and B350 as well, as the throttle needs to be at 75% min.Frank F
