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I just noticed this tonight... I was flying my 2 blade MkIa into a dive... at 320mph I pulled up slightly and performed an aileron roll (as fast as the airspeed would let me). Halfway through the roll I heard a loud sound, like a tire touching down during landing, followed by a bang. There was no visible damage to the aircraft, it continued to fly very well, and upon landing there was nothing to report in the maintenance hangar.

Curious, I took off again, this time with the 3 blade prop, and at 340mph performed the same aileron roll, and had the same sound again also with no apparent damage.

Was I damaging the aileron by rolling at too fast an airspeed?

I tried to replicate the sound in the MkIIa and failed. Then I tried one more time in the MkI, this time at 350mph, and FSX froze. That was the first time in months I've had a freeze, and the only time on my new system. I am running the Accu-sim 1.1 update.

Any thoughts?

Thanks,

Joe

Joe,

Can you please turn crash detection on and try this...see if it crashes the aircraft?

If you have it on already, try turning it off and see if you get the same?

Strange! Normally I would say it may be the undercarriage floating in the locks but if it doesn't happen on both....?

Darryl

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...Some say he never blinks, and that he roams around the woods at night foraging for Merlin parts...

Well, that was eventful! I took off and decided to double check the problem before making any changes, just to be sure I'm not too crazy. While I did not get the sound again in a roll, it did occur in a straight dive, and in a climbing turn. So I went to check my crash detection settings, at which point I notice I have "detect airframe damage from stress" checked, which I recall is a no-no in Accu-sim. Must've left it checked when I reinstalled a few months back. Anyhow after unchecking that box, I can no longer replicate the problem, so as of now I hope and believe it is solved.

But my problems continue... Being in a hurry to get airborne to do the tests, Genius here forgot to check how much gas was in the tank. So my engine starts running foul and quits before I can make it home. I'm out over the ocean, but there are some great fields just near the shore within easy reach. I'm a little high, so I do one 360 degree turn to lose some altitude... big mistake. That big old 2 blade fixed pitch monster was my personal speedbrake, and I splashed down about 50 feet off the beach. Luckily the salvage and restoration crews are good and I should be flying again tomorrow. Another lesson relearned!

BTW, I noticed I was getting a contrail above 7,000 feet... disappeared below, reappeared above. Radiator temps never exceeded 100. All in the MkIa. Maybe I need sleep, I'll check that again tomorrow.

Thanks yet again, Darryl!

Joe

I do not recall the "airframe damage due to stress" box to be unchecked for accusim aircraft. Can anybody confirm?

I once got also this strange "bump-noise" in flight during a tight turn after a dive but did not investigate any further. Will make a test tonight without airframe stress checked.

BR,
E.

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Hello.

1.This problem was present in an earlier version also, however no fix was issued, it happens in high g turns and on high airspeed, like it was said earlier. .
The floating gear is modelled ? Nice , maybe this is a problem.

2.After some explanations, there is no more a need to uncheck anything for an accusim aircraft.

Truthfully, that is something from the depths of my memory. It may or may not be true... if someone can confirm for me in the next couple of days, awesome. Otherwise, I'll recheck the manual. But deep down I'm pretty sure I read this at some point....

On a side note, I'm glad someone else knows what I'm talking about with the sound, that verifies that my mind is not too far gone just yet

BTW was the sound for you before or after the Accu-sim update?

Joe

Edit: Just read your post, Caldemeyn... thanks for the info, I appreciate it!

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OK, I guess I was thinking of Page 15 of the Spitfire Manual (Not the Accu-sim specific one) where it recommends unchecking "Engine Stress Damages Engine" (Acceleration only). Here I see that that airframe stress should be checked. I was wrong there! However, I'm gonna double check for the sound with and without the "airframe" box checked.... Maybe thats where the bug is?

Caldemeyn, could you link me please to the previous thread involving this issue? I'd like to read it, thanks.

Joe

1.Regarding the high g sound of landing gear, im sorry, but i can't find this note( it was mentioned in a topic not directly linked to this problem) and i don't remember it, it was a while.

2.The lack of need to uncheck anything for an accusim aircraft is explained here with the example of 377, the spit manual is no longer valid for this particular problem.

viewtopic.php?f=80&t=26105

I don't recall this problem ever being talked about before. Perhaps you can point me to the original post? I don't think anyone reported this in beta, and I sure don't have the issue myself. A bit perplexing.

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"1.Regarding the high g sound of landing gear, im sorry, but i can't find this note( it was mentioned in a topic not directly linked to this problem) and i don't remember it, it was a while." I remember it was mentioned but "memoria fragilis est" and i just can't find it through search option now, i know, im useless. its like shooting myself in the foot.

No worries bud, I'm just trying to help the team get down to the bottom of this. When I was in the USAF, we would call a problem like this "intermittent," meaning it was not easily traceable and was not easy to induce. Any more details if you have any could be helpful, from all parties.

Is there any possibility that this could be a fuel starved engine? The fuel in the early spits were gravity fed.

Sometimes Accu-Sim makes it hard to trace down issues because the aircraft act so organically.

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, Well, mr. JoeS475 explained it pretty good, its the sound of tires hitting the ground, happens on high airspeeds(dives) and violent maneuvers, these must be combined to obtain it.

For the life of me I cannot reproduce it.

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Yeah, its definitely a tire sound... I was low on fuel each time I head the sound, probably less than 1/3rd of my bottom tank, but it was definitely not a fuel starvation issue... in fact it was under positive G's each time I've heard it.

I'll try again tonight, Daryl's initial thought about the gear floating in the locks makes some sense to me...

Cody, I'll let you know my exact settings this evening once I've had a chance to dig deeper.

Joe

In the meantime, try to think of any pertinent addons to your FSX that could effect things.

I hope if there is a bug we can track it down.

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