With activated autothrottle, or deactivated autothrottle?
How far does air speed drop? There seems to be a bug where Max Cruise doesn’t “catch” and throttle drops to Idle.
So I’m having trouble with this myself. Seems like it’s another case of having to hit the right buttons at the right time.
I’ve been trying various combinations with autothrottle on and off. I couldn’t get Max Cruise to work. I was Alt Hold at 550 and was able to get it to work for some reason by staying at max dry thrust, setting Alt to 60000, AT on (both of them) and Alt Aquire, THEN Max Climb. It immediately changed to Max Cruise and is keeping M2.04 now.
@DEAN01973 I think people are not saying that they are Max Cruising at less than M2. I think they are all reporting the problem where turning on Max Cruise seems to make the throttle go to Idle. I am having this problem too. It seems like getting Max Cruise to catch requires a very narrow set of conditions.
Could you explain, exactly, what has to happen to engage Max Cruise successfully?
Ah! Gotcha! Yeah I was probably too heaving. I had around 70tons of fuel then. Around FL60.
Will try again and report. And I’ll make a video this time.
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Also on Series X. I have no issues at all but on beta.
Yeah that doesn’t work, as I said max cruise works for me at 60,000 it’ll hold M2.04 perfect for me, anything below that it will throttle way back on me even though I’m no where near TMO and with full dry power it’ll pass 2.04 with ease.
Previously it would hold around M2.00-2.04 (which was the max with full dry power anyway) using max cruise around 50,000 perfectly for me and then I would slowly climb to 60,000 if possibly (mostly I didn’t make it) but on this current version now every flight I make 60,000 with ease
Awesome! Thanks I appreciate it. Time to learn…
MAX CRUISE is designed to seek Mach 2.04 and also stay within the temperature limit of 127 degrees C. If someone has reached FL600 and Mach 2, then engages MAX CRUISE, it’s likely the fuselage will be overheating as Concorde rarely reached those speeds and altitudes early in her flight.
I think that the method you outline is the best one, as MAX CLIMB takes you to the set ALT and then MAX CRUISE takes over automatically from it. Again, though, it does require the pilot to ensure that Concorde is able to reach those conditions without overheating or requiring reheat, so that super-cruise conditions are met for fuel efficiency.
Also, fuel balance must be right otherwise Concorde will be fighting extra drag and Angle of Attack. It will still reach Mach 2, but will be working harder to achieve it.
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So after reaching FL60; we should disengage MAX Cruise and set Mach Hold. Or that’s not necessary?
Currently im at FL60 and Max Cruise engaged. Its at 1.99.
Issue is: if I press Mach Hold now + Engage Auto Throttle → the engine goes to idle. And the throttle too.
Is this by design? Am I doing something wrong?
OR Do I just leave it set to Max Cruise + NO AT + FL60 for the whole cruise? (Because this is what I infer from the checklist).
Edit: I’ve left it at Max Cruise + NO AT + FL60. The speed seems to be dropping. it dropped from Mach 2.02 to now its Mach 1.92.
Right, but what I’m asking is what exactly are the steps for activating Max Cruise. I am able to activate Max Cruise in my example flight where I’m using low fuel (only 71%) so it’s easy to get to 60K and M2.04 right away. The problem is that pushing Max Cruise results in Throttles to Idle and deceleration. This is not a temperature problem. I can verify that by the readout on the pedestal.
The problem is the sequence of commands. I did exactly as described in the checklist but Max Cruise didn’t take. I eventually stumbled on a way to engage it but I don’t know why it finally worked.
@DrivenImpala805 My understanding is that you need to have AT on but I am having the same problem as you. I finally got Max Cruise to engage and it had AT on but I don’t know what made it happen.
My speed has now dropped to 1.8
Edit: if you need to have AT on as @mdapol said; I think the checklist needs to be updated. It says to turn off autothrottle in “Cruise” part after reaching 24000FT. But thereafter, its never mentioned when to turn it back on.
Edit2: After turning on AT, my speed seems to be going back up now again. And I noticed turning on AT turns on the afterburners too. I think this is a known issue?
Edit3: Now I’m at 1.98 and I’m getting the overspeed warning.
Edit: Turning off max cruise and setting mach hold + AT is not working either. I keep getting the overspeed warning around 1.97 at FL60.
Sadly I’ve had CTD a few times with SU9
Also noticed when starting on runway that I only had engines 1&2 running
I might uninstall SU9 Beta to see if things are better with SU8
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Here’s what I did to have a fast mach speed! According to the checklist, I am at 50000 ft and then in 2000ft stepclimbs, i.e. FL520, autothrottle on, pressed “ALT -AQU”, then pressed “MACH HOLD” on the right side and let it climb and just before FL520 then “MAX-CRUISE” pressed. The Concorde leveled off and I did these steps with every stepclimb. At FL580 I’m then on MACH 1.99. If I were a little lighter, Mach 2.00 wouldn’t be a problem! With patience you can reach your goal!
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I think that I might have to ask @CodenameJack447 what the requirement is, if the checklist is not working as it should. Turning AT off before the climb ensures that reheat is only used until Mach 1.7, otherwise they stay on for much longer ( this is the part that is the MSFS issue rather than Concorde ). You can leave AT on for that portion of the ascent, of course, but it burns more fuel and isn’t realistic to Concorde procedure ).
If switching ATs back on to maintain MAX CRUISE is a requirement, which does of course make sense, then I will add that step to the checklist for sure.
I don’t use AT past M1.7 and my problem is once I get to cruise altitude, I try to reengage auto throttle with Mach Hold and the throttle go to idle.
I’ve tried this with both the left side and right side Mach hold.
I’m not saying it is. Its how it behaves now. But perhaps best to check with someone who’s knowledgeable on this? 
And yes, turning on AT (as I have done now) + Mach Hold = keeps the afterburners on. Even if I turned them off earlier; which according to the checklist I did at Mach 1.7. So that part worked fine.
OT even i noticed this. Tropics are otherwise known for hotter temperatures at ground level whereas jfk region is colder. But the situatation reverses at high altitudes… why so?
Right but the reheats are not supposed to be on above Mach 1.7. For those of us trying to fly the Concorde as it should be flown, we have to use the workaround where we turn autothrottle off.
So technically, that is not “fine”.
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