I've been looking at RTO's in the MD11 - after an RTO at MTOW (V1 167, rejecting about 160) with T.O. autobrakes and no reverse, why do the brake temperatures rise for several minutes after stopping?Immediately after the aircraft has stopped, temps are about 23C, then 2 minutes later have risen to about 100C. They then continue to rise, but at a slower rate, reaching 200C at about 2 minutes 45 seconds. They peak out at about 340C at around 11 minutes after coming to a halt, then cool very slowly.Why wouldn't the brakes be at their hottest immediately after stopping? How can energy be being 'made' when the aircraft is stationary?I guess it's something to do with where the temperature sensor is located?Thanks!

It is very realistic, and you are close in your guess. The temperature rise is due to heat soak, or the thermal flow of energy from the source to the other components. It's not unusual for a MTOW RTO to result in the PSV's popping to prevent tires from exploding. I belive the fire that will always occur is not supposed to start for 3 min to give time for emergency response vehicles to get there... this is a major event!I've seen light twins (C-424) with tire fires after a RTO.

Thanks Dan -Why is the indication fairly (well, comparatively) immediate in the 744? I'm pretty sure the gear synoptic on the 744 indicates amber temps pretty much immediately you come to a standstill. Is that just because it takes less time for the heat to spread to the sensors on that landing gear?

Thanks Dan -Why is the indication fairly (well, comparatively) immediate in the 744? I'm pretty sure the gear synoptic on the 744 indicates amber temps pretty much immediately you come to a standstill. Is that just because it takes less time for the heat to spread to the sensors on that landing gear?

While Dan is correct that the PMDG MD11 simulates the Brake temps continuing to rise I'm still under the impression that the initial temps after a RTO at MTOW is incorrect and way too low, this has been mentioned by a number of users in the past. I ran a test a long time ago as an example - OMDB 12R SAT was 40c aircraft was loaded to MTOW using full rated thrust I rejected takeoff 15 knots 'After' and V1 applied Max manual braking without reversers, then taxied back to active and did the same thing again.The brakes got hot but no where near dangerous levels, if that was the real thing we would have a very different story.Regards

I too think the brake temps are too low. It would be cool to see if it was possible to simulate gear fires after extreme RTO's.Here is a great video of a RTO test of an A340-600. All looks fine but you'll soon see it's not. It's great to hear them freaking out toward the end!!!A340-600http://www.youtube.com/watch?v=hRzWp67PIMwHere's one on the Boeing 777.http://www.youtube.com/watch?v=wXpjBxD0RhgIf you want to see a great up close video on a brake test, check this out!A380-800 Brake test:

That A346 video is pretty worrying tbh, you'd think that firefighter would know better than to keep approaching the gear when tires keep going off like that..

The brakes got hot but no where near dangerous levels

What would you consider dangerous levels? Per the manual, the max temperature indicated is 936C - my temps peaked at about 340C at 11 minutes after stopping.Might it be a trait of the real MD11 that the temperature sensors are placed such that there is a greater 'lag' between brake application and indicated temperature rise compared to, for example the 744? That would seem a bit of a design flaw to me, as not being able to get a decent idea of brake temperatures after a high speed abort pretty much defeats the purpose of having the indicators there in the first place!

Not really sure how the MD11 brake temps work, It would never happen in real life but I think it's safe to say that any heavy aircraft that performed two rejected take off's at MTOW above V1 in quick succesion would have problems. This has been discussed in the past and I hoped it would be fixed with the last patch, I also remember PMDG talking about adding the Female Voice that says 'Tire Failure' Not a big deal on the grand scheme of things anyway.BTW I'm ashamed to say I own the LVLD 767 studied all the documention from top to bottom but have flown it maybe three times, not because of the lack of quality, just prefered flying the PMDG 744. Anyway I noticed 'tire failure' in the failures menu, what exactly does that do? how do they simulate that within FS?Cheers

BTW I'm ashamed to say I own the LVLD 767 studied all the documention from top to bottom but have flown it maybe three times, not because of the lack of quality, just prefered flying the PMDG 744. Anyway I noticed 'tire failure' in the failures menu, what exactly does that do? how do they simulate that within FS?

I never really tampered with the failures on the LDS 767, so I'm really not sure!Could anyone from PMDG enlighten us on the brake temperature issue? Of course it's not a big deal, I'm just intrigued! Thanks

Had a browse of the videos posted by Turbine777. Great stuff and incredible engineering. If you haven't seen the vids i highly recommend them and many thanks for taking the time to post them :)

For obvious reasons, the temperature sensor for the brakes can't be located at the EXACT point where the brake assembly 'grabs' the disc. Instead it is located on another part of the assembly, to read the temperature of the whole component.It takes some time for all that heat at the point of friction to spread through the metal part, so it gradually heats the sensor up.To be fair I'm not 100% familiar with the gear/brakes assembly though, so whether the temperature modelling is accurate or not is not for me to say. I believe it would have been done that way very deliberately by the developers, though. Otherwise us Beta testers would have been be all up in their faces about it. We're annoying like that.

I would never expect to see the brake temps modeled other than seeing them temp rise and decrease (which for me is more than enough), but if I did it would be pretty sweet! I have had a few RTO's with FSP (always forgetting to shut the invisible door) and a touch of smoke and maybe rendering the aircraft unusable until reload would be great but due to FSX limitations I don't know if that can even be achieved. If so, I could see us all now slamming on our brakes to watch it burn :(