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rjsagel

Q400 Bouncing at Startup

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Hello,

 

MY new Majestic Q400 bounces around the airport when I start it up. I always start with the "complex startup" and all is fine.

I then load the Q400 and it is "bouncing" around the start point - into the air.

I can usually stop it with a reset of the flight and a new load.

 

What causes this to happen?

 

Thanks in advance,

 

Ron Sagel

 

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Good question... it happens to me as well, when I change from a default Cessna I have as part of the default flight setup...

 

A

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We are looking into this issue.  We are aware that there are times that the Dash tends to have a jittery effect just after loading, and we though that we addressed this issue.  Usually after loading the aircraft you will see some compression on the main and nose gear (possibly a skip or two), but the aircraft usually settles there after.  But the bouncing that you are experiencing seems to somewhat more aggressive.

Please bear in mind that because of the JSBSim interface for the FDE, the Dash has to rely heavily on FSX's Simconnect for interaction.  That is why you may see a slight pause when in flight, switching from 2D to Full Screen or after un-pausing the sim while in flight.

 

Please try this for me;
Load the Dash directly from the FLY NOW (choose airport, wx, time, etc.) state of the sim (no need to select a Cessna or Complex Startup mode). - ----then....

Load the Cessna, shut the engines down if you choose to, then load the Dash

Is the Dash displaying the same behavior?

 

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The bouncing effect is more pronounced when you load directly from an FSX default aircraft in the main panel page.  I think it has a lot to do with the Dash-8 not having a main panel yet.  If you load from a default FSX aircraft in the virtual cockpit, you rarely get the effect.  If you do, the effect is greatly reduced and stops within a couple of seconds.  Just my experience so far.

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I seem to have an extreme form of this bouncing problem. Everything goes fine until I'm taxing, then the plane bounces a few times and then takes off like a helicopter spins around in the air then crashes. It does this every time I try to fly and it’s driving me crazy! I want to fly this beautiful plane. Does anyone have a suggestion?

 

 

 

Thanks,

Joel

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I seem to have an extreme form of this bouncing problem. Everything goes fine until I'm taxing, then the plane bounces a few times and then takes off like a helicopter spins around in the air then crashes. It does this every time I try to fly and it’s driving me crazy! I want to fly this beautiful plane. Does anyone have a suggestion?

 

 

 

Thanks,

Joel

Joel, are you running the affinity mask tweak? It fixed the issue for me.

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Joel, are you running the affinity mask tweak? It fixed the issue for me.

I don't know, I'v never heard of the "afinity mask tweak"

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If I start FSX and select the Q400 then select the airport and click Fly Now. I get NO bounce.

If I then select a default FSX plane, let it load and re-select the Q400 the plane will bounce several times (maybe 2-3) settle down and everything will be normal.

 

For me, this behaviour can only be reproduced if I follow the steps above. Hope this helps.

 

 

 

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I seem to have an extreme form of this bouncing problem. Everything goes fine until I'm taxing, then the plane bounces a few times and then takes off like a helicopter spins around in the air then crashes. It does this every time I try to fly and it’s driving me crazy! I want to fly this beautiful plane. Does anyone have a suggestion?

 

 

 

Thanks,

Joel

 

Suffering the same problem

 

Hit 'Y' twice, and you'll be okay.

 

What is "Y" for?

 

 

 

If I start FSX and select the Q400 then select the airport and click Fly Now. I get NO bounce

 

I did have the problem in this situation.....

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What is "Y" for?

 

 

 

If I start FSX and select the Q400 then select the airport and click Fly Now. I get NO bounce

 

 

I did have the problem in this situation.....

 

 

If memory serves me correctly 'y' turns on/off slew mode.

 

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What is "Y" for?
If I start FSX and select the Q400 then select the airport and click Fly Now. I get NO bounce
I did have the problem in this situation.....
If memory serves me correctly 'y' turns on/off slew mode.

 

Thanks Darkstar!

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The SLEW function does arrest the bounce problem.  But I have found that the bounce seems to be a bit more exaggerated if the dash is loaded after a default FSX plane..

 

I have not been very active on the forums today because I wanted to get up with Oley so we could attempt to find some work arounds for some of the issues.  This being one of them.  We may be onto to something that should fix the problem but it still requires quite a bit of testing.

 

Thanks for your patience.

 

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It looks like I solved the problem for me. I did the afinity mask tweak and turned slew off/on, and was able to do my first flight without bouncing. 

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Actually, the SLEW function does nothing to help on my machine.  At present this aircraft is completely unusable due to this issue:-(

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Hi, I also noticed this issue when my first flight. So I edited some of contact point entries in the aircraft.cfg like below,

Looks like  this edit put  bouncing issue down or at lease to weaken. Red and bold texts are change entries.

 

 

[contact_points]
 
point.0=1,  -8.50,  0.00,  -8.00, 1600, 0, 1.83, 46.8, 0.2, 1.0, 0.45, 10.0, 10.0, 0, 260.0, 260.0
point.1=1, -56.50, -14.42,  -9.15, 1600, 0, 2.66, 0.0, 0.3, 1.0, 0.45,  9.0,  9.0, 0, 260.0, 260.0
point.2=1, -56.50,  14.42,  -9.15, 1600, 0, 2.66, 0.0, 0.3, 1.0, 0.45,  9.0,  9.0, 0, 260.0, 260.0
 
static_pitch = -2.0
static_cg_height = 7.8
 

 

Hope this edit will be a hint to your solution..

 

 

Missi

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Hi Guys - Simeon.....If I load the "Q" right away (never loading a DEAULT FSX plane) - I get NO bouncing.  Just thought I'd mention it.

 

Thanks for a GREAT Aircraft!!!!!!!!  (Oh, and now a great Tutorial!!!!)  Best $60 I've spent this year!! (After Opus and ProATC!)

 

All best,

Ray L. (Blackbird)

 

 

P.S. - not to HiJack - but Guys - what Affinity Mask setting are you using?  Just curious - I currently use Affinity Mask = 14 (I'm on a Q6600).  The plane "drags" (stutters) like crazy at times when taxiing.  However, once in the air - no probs at all - great frame rates!!

 

Thanks!

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Same here, it stutters when taxing, but flying it's just a dream.

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Hi Guys - Simeon.....If I load the "Q" right away (never loading a DEAULT FSX plane) - I get NO bouncing. Just thought I'd mention it.

 

Thanks for a GREAT Aircraft!!!!!!!! (Oh, and now a great Tutorial!!!!) Best $60 I've spent this year!! (After Opus and ProATC!)

 

All best,

Ray L. (Blackbird)

 

 

P.S. - not to HiJack - but Guys - what Affinity Mask setting are you using? Just curious - I currently use Affinity Mask = 14 (I'm on a Q6600). The plane "drags" (stutters) like crazy at times when taxiing. However, once in the air - no probs at all - great frame rates!!

 

Thanks!

 

Ray, I think it depends on your processor. I had my affinity mask set up by the Bojote website, and it is running at 14.

 

You need to check the settings in the MJC400 control panel, my stuttering went away when I chose FSX sync.

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Those wondering about Affinity Mask, here's what I know:

 

[JOBSCHEDULER]
AffinityMask=244 (Quad core w/ HT, 8 threads)

AffinityMask=14 (Quad core no HT, 4 threads)

 

BTW, the Q400 looks amazing and I'm seriously contemplating a purchase.

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Thanks bblackbirdd,
I had mentioned this in an earlier post as a trial.  You are correct in some (most in my case) instances the aircraft does not display that bouncing behavior once loaded without any previous aircraft prior.

Regarding AMsettings:
I have experimented with various settings AM=14 and 7 or 5.  AM=5 tends to yield  much smoother performance for me.  During testing I did have the rare occasion of the start/stop syndrome, but I was not using the AM tweak at the time.

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<p>Hi Simeon, Will and other Folk....the Ol' Blackbird here for a moment to say thank you.....AND....</p>
<p> </p>
<p>Last night I tried both Affinity mask=5 and also 7 (rebooting my quadcore in between.  To my surprise, for me, AF=7 is a "Silver bullet", giving no stutter performance on the ground AND in the air...!!!  ????  Don't know why, don't understand all the math behind it....... it just works!!  Hope to do more "testing" today.  </p>
<p> </p>
<p>What's that, Dear?  Yes, I'm conducting some VERY important RESEARCH....think she'll buy that?  <img alt=" :lol:" class="bbc_emoticon" src="http://forum.avsim.net/public/style_emoticons/default/laugh.png" title=" :lol:" /></p>
<p> </p>
<p>Thanks, Everyone!  Goin' back to sleep for a while....</p>
<p> </p>
<p>All best,  Ray L.  (Blackbird)</p>
<p> </p>

 

 

Sorry.... don't know why my post looks like this  (html??)

 

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Sorry about the above post by me - don't know what happened...... :blink:

(I was using my tablet (Nook) at the time - that's prob it.....let's try it again, eh?)

 

Hi Simeon, Will and other Folks....the Ol' Blackbird here for a moment to say thank you.....AND....

 

Last night I tried both Affinity Mask=5 and also 7 (rebooting my quadcore in between.)  To my surprise,  AF=7 is a "Silver bullet" (for me), giving no stutter performance on the ground AND in the air...!!!  Don't know why, don't understand all the math behind it....... it just works!!  Hope to do more testing today.

 

"What's that, Dear?  Yes, I'm conducting some VERY important RESEARCH...." 

 

Think she'll buy that?  :lol:

 

 

Thanks, Everyone!  Goin' back to sleep for a while....
 
All best, Ray L. (Blackbird)

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