The minus bit I get for economy, but how do you go EGT peak plus 50? If you are at peak, then by definition you canât go higher. From peak you can lower the temperature in two directions, so do they mean rich by 50 for best power, and lean by 50 for best economy?
One setting is ârich of peakâ, ie lean to the peak value then go back 50 degrees. The other is âlean of peakâ, ie lean to the peak value then continue till the egt drops 50 degrees.
Is anyone having problems when use the Autopilot.
Not sure what happen but now when active the autopilot the plane become crazy.
I practiced some IFR yesterday and today in not working as before.
Well, like I say. When I active the autopilot the plane just start to turn up down and donât follow any of the instruction from the HDG or ATL or NAV. It looks like when the rudder is stuck in a bad position.
Thanks. that makes sense. So I usually run at the very peak, so am probably adding wear to the engine. I wonder if that is modelled, and if were to have damage to systems turned on it would either end my flight, or show engine failure? I donât care for the black screen just ending my flight, but if the engine sputtered mid flight, and started to fail, that would be a fun situation to deal with.
You are wrong, when at peak, PUSH to get richer mixture until peak-50⊠because if you continue to lean until peak-50 mixture will be too poor and youâll damage engine !
The idea is to lean mixture until minimum fuel quantity then enrich the mixture to avoid damages !
He is right. Your procedure is to obtain a rich of peak (best power), but for cruise is bettter to get a lean of peak (best range and economy). The thing is the mixture is not simulated properly in the sim and its fixed or linear, but the numbers match within the fuel flow table provided, so at least isnt that bad
For example, at 10000 feet, matching the out temp, at 20.2 manifold pressure, at 2300 rpm you are going to get 11.8 fuel flow (econ) at lean of peak with 65% theorical (table) power. If you look the yellow indicator in front of the copilot panel (upper is power, + - 65% match, and bottom are cylinders cht and egt temps) the table matches. If you enrich the mixture (push) until 13.9 fuel flow, you are going to get peak of rich (best power) and again, the yellow indicator is going to show 65% power. I think the 50Âș difference readed in the EGT doesnt match at all when you are enriching or leaning, but the table numbers are accurate in the sim. And of course, In lean of peak, when cruising, the cht temp is going to fall to safe values (± 388Âș), so no damage to the engine
Rich of peak: Best power, high fuel flow
Lean of peak: Best econ, lower fuel flow
Just quickly, if your CHT getâs too high, the procedure is to either reduce power until temperatures fall, to richen the mixtures (as in, introduce more âcoolâ fuel to lower temparatures), or both.
I notice that airspeed contributes to cool the cylinders too. More airspeed, more cool. Its useful when climbing at high power. If you climb âfastâ (>120 knots airspeed) you are going to reduce more âheatâ and prevent the cht going to high when high power output. In aproaches to landing, because we are going âslowâ, the cht goes up quikly.
I was having A/P issues too and found the KFC-150 pilot guide helpful, especially on how best to use the KAS 297B Altitude Selector. Hereâs what I found works best:
After engine start and while on the ramp, enable FD and HDG on the KFC 150.
Set desired altitude on the KAS 297B and select ARM.
Set heading bug on the PNI to runway heading.
After t/o, switch on the A/P. The plane should begin a default 500ft/min climb toward armed altitude. To increase/decrease rate of climb, use the UP/DN toggle on the KFC 150 (do not use the vertical speed function on the KAS 297B).
Use the HDG bug to intercept the flight plan path, then engage NAV on the KFC150.
When ready to descend, set the new altitude on the KAS 297B and press ARM, controlling descent rate with UP/DN toggle on the KFC 150.
Just one correction, never enable HDG before t/o or your aircraft will immediatly try to take this heading while youâre still on the runway, the same thing is true for ALT or your aircraft will climb before t/o and it usually doesnât finish well âŠ
Is it considered bad practise to have them armed though? I use the Logitech panels, so when communicating with ATC, and filing my plan, I enter in the ALT, and VS I want, while on the ramp, but I donât enable the AP obviously. Then after take-off I know I can simply either enter the heading I am instructed to use, or my next waypoint, tap NAV/HDG accordingly, and finally tap the AP button, or the right button on my yoke.
I could see not entering those just in case you enable AP by accident would be safer, and I assume with nothing entered the AP just flies level, although I donât think I ever tested that.
