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P-51 Emergency landing tail bouncing causes aircraft disintegration and explosion


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Tonight during routine flying online I have suffered hydraulic and coolant damage, which prompted me to proceed to nearest airfield and land. Upon landing I noticed lack of hydraulic pressure, so I used emergency handle to extend the landing gear and banked airplane few times to make sure its locked. On final approach engine failed me, but I managed to glide the aircraft and put it down at approx. 100 MPH in three-point position. 

Airplane landed on front gear first, which extended properly, but as soon as tail touched the ground it started porpoising / bouncing (with rather constant intensity), after few bounces tail came off, plane caught fire and as soon as I stopped, entire plane exploded, killing pilot instantly.

This was extremely frustrating as I did everything right, yet have to suffer consequences of the bug. 

 

This prompted me to ask for help and record two instances offline which show exactly what is happening:

1. 

2. 

 

As you can see with emergency wing deployment tail wheel remains retracted, which is wrong. Even DCS P-51 manual indicates that tail wheel should come down on its own:

image0.png

 But what follows is even worse. With first touch of the ground (concrete or land) tail starts bouncing (from readings of acceleromter it seems to be +1 / -1 G) and after 2-3 bounces entire tail comes off, center of the aircraft ignites and soon machine explodes.

 

Thus there are few questions which demand an answer:

1. why is tail bouncing in such a manner when there is contact with the ground ? Is collision model correct in rear section ?

2. why is entire tail section so easily detaching ?

3. why does center of the aircraft catch fire in this situation ? (and why is it followed by explosion ?).

I have seen a number of aircraft crashes, including a few P-51s, but never seen entire tail tear off of it and I haven't seen bouncing like that. Id rather expect tail to fall and scrape the runway, with tail section being bent. But not completely tear off in such manner, when loads applied on it do not exceed 1+ G (as indicated by accelerometer).

 

Secondly there is no reason why aircraft should catch fire in this part. I made sure that both instantaneous mission and my online flight were with auxiliary fuel tank empty. So there is nothing that should catch fire like that and even more so cause explosion. Wing fuel tanks are far from the section which breaks and since front gear is fine, they are not in contact with runway.

 

This issue is rather important as me and number of friends from my squadron (I presume other people encountered this as well) experience this every time we try emergency landing. It can be replicated almost every time and almost every time leads to death. This prompted us to make landings with gear up which by definition should be significantly more risky.

There is a reason why emergency gear release existed and it was used. Current DCS implementation with this bug prevents any effective use of it.

 

I attach the track from offline test. I also have track from multiplayer, but its almost 2 hour long so not sure anyone wishes to wait until its very end.

 

bouncy_bouncy_tail_breakoff.trk


Edited by Hiromachi
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Update. I was also made aware that tail bouncing can occure even with simple landing gear retraction:

 

AMD Ryzen 5900X @ 4.95 Ghz / Asus Crosshair VII X470 / 32 GB DDR4 3600 Mhz Cl16 / Radeon 6800XT / Samsung 960 EVO M.2 SSD / Creative SoundBlaster AE-9 / HP Reverb G2 / VIRPIL T-50CM /
Thrustmaster TPR Pendular Rudder Pedals / Audio Technica ATH-MSR7

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Nice bug catch. As for the second part of your question, the drag values of the ground in DCS World are way off. In fact the entire ground handling physics are very, very strange and very underdeveloped compared to everything else in the sim. 

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I have reported to the team, specifically the tail section coming off to easy. 

 

thanks

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Reminds me of the bury-tail-after-repair-bounce-up-insanely bug (the bounce is long fixed). It does show tail part coming off easy (too easy?). Interesting note, though just repaired, violent bounce up destroys tail wheel. So tail-plane hits ground without tail wheel dampening.


 

Quote

 

...Taxi off RWY onto grass at Batumi, retract landing gear. Repair.

First just prop bent, then from bad to worse ... and worse (pilot dead).

 

 

 

 


Edited by -0303-

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