The A340 is overpowered

[Beurreesale]

Hello,

I would like to thank you again for providing to the community this beautiful airplane.

I observed than the initial ROC is too much. Between 2000 and 2500ft/min or more at heavy weight which is way too much and even at light weight T/O and It doesn’t give the feeling that the aircraft is struggling to climb. Looking over-powered. In reality the A343 just after lift off has a ROC very very low. Around 1600 1700ft/min and sometimes even less ! As you can see here as an example of a real A343 Take Off: To defend my opinion, this only one of the many videos we can find on the internet (low climb, nearly hitting the tail, more recently descending just after lift off or pilots feedbacks). Even at low weight the A340 is used by major airlines in the summer for short haul flights, we can observed a terrible weak ROC.

Even at low weight the A343 got a very weak Rate of Climb and not 3000ft/min or more on the addon and I hope this will be improve later. This Topic following my previous one that which I can’t find anymore where I suggested engines and spool-up behaviour (the initial spool-up is too fast and from 50% N1 to Flex THR, It’s too slow). It should be the opposite. 

My biggest matter is the Rate of Climb which needs to be review in the next update because it’s the identity of the a340 at any weight and I think it’s a shame if we don’t see that in the futur considering the beautiful addon It is already.
 

Once again, Thank you so much for this addon that a lot of people were waiting for so many years and the quality of It. Looking forward for futurs updates !

Best regards.

[iniSteven]

Our performance numbers come straight from aircraft manuals and have been verified by multiple pilot advisors. If you can provide data to support inaccuracies in specific conditions, we are happy to make adjustments. But a youtube video with unknown weight and thrust settings in unknown weather conditions is definitely not an authoritative source upon which we can base wholesale changes to the flight model.

Keep in mind that our takeoff calculator uses the Airbus numbers - Individual airline operators may have different performance calculations better suited to their specific needs, including more aggressive engine de-rates on takeoff than the baseline numbers.

While it's true that the A340 does not have the same rocket capabilities on takeoff of a 757, it does have certain performance advantages - for example, Air France enjoyed operating them to SXM because the engine-out climb performance meant it could make a non-stop return to Paris, whereas the twin-engined A330s either required severe load limitations or a tech stop in Curacao to make the crossing 🙂

[Wothan1967]

I think in one of A330 Drivers YT Videos is told that the EFB calculated Flex temp seeme lower that what he would have expected, thus giving the engines more power.

That seems to be in line with what iniSteven tell in the post above.

[Donald Douglas]

I just left Riyadh (2000 msl) at 36C and only about 195T-- Flap 3 Flex 53-- no issue getting off the runway and initial climb was fine, but I definitely barely made the above FL230 SID restriction almost 60 track miles away, and this was with no intermediate level segments, and I was speed restricted to 250 until around 13k feet.  So I think, yes, it might be pushing harder on takeoff than some airlines did irl, but overall it's climb performance is still pretty realistic.