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plane crashes after take off

Controlling your aircraft, using the autopilot etc.

plane crashes after take off

Postby lcoon0 » Thu Jan 24, 2019 4:35 pm

plane crashes immediately after take off
It banks heavily to the left, it dives to the ground and the joy stick can not control i t.
please help
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Re: plane crashes after take off

Postby wkitty42 » Thu Jan 24, 2019 9:51 pm

which craft are you talking about?
if it is a single prop craft, yes, they will head left or right once off the ground due to the engine torque... you have to counter it with ailerons and maybe some rudder...
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Re: plane crashes after take off

Postby legoboyvdlp » Thu Jan 24, 2019 10:03 pm

I think the issue here is his controls not responding. I'll let others who use a joystick respond for that as I just use the module.
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Re: plane crashes after take off

Postby V12 » Thu Jan 24, 2019 10:16 pm

Bad joystick calibration ?
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Re: plane crashes after take off

Postby lcoon0 » Thu Jan 24, 2019 10:21 pm

Flying the Cessna 172
It feels like the auto pilot or something like it is in control. I move the joy stick and the plane does it's on thing. Rolls over to the left and goes down. Pulling back on the stick will not raise the nose.
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Re: plane crashes after take off

Postby Parnikkapore » Fri Jan 25, 2019 1:40 am

Firstly, the plane will naturally roll left on takeoff. This happens IRL as well.
  • There's a weird bug with the 172 where the controls lock up on Autostart. Try moving the stick just after starting the engine and see if the yoke (steering column below the panel) moves. If it doesn't, click on the yoke twice to hide and restore it. This would solve the problem. Apparently, only on my machine.
  • Try checking the joystick config to see if the stick is detected and mapped properly.
Last edited by Parnikkapore on Sat Jan 26, 2019 1:10 pm, edited 1 time in total.
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Re: plane crashes after take off

Postby Alant » Fri Jan 25, 2019 1:49 am

Please: Select an outside view and check that the rudder, aileron and elevator respond to your joystick. and all three return to zero when you release the joystick,

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Re: plane crashes after take off

Postby wlbragg » Fri Jan 25, 2019 2:10 am

You could be stalling the aircraft. Make sure you have enough airspeed before lifting off the ground.
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Re: plane crashes after take off

Postby lcoon0 » Sat Jan 26, 2019 12:07 am

The joy stick and controls work perfectly after the engine is started automatically. Take off goes as expected. Then, 10 or 15 seconds after lift off, the plan banks hard to the left and crashes. The joy stick will not work. If I didn't know better, the auto pilot was in control, but the auto pilot is not engaged.
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Re: plane crashes after take off

Postby wlbragg » Sat Jan 26, 2019 1:15 am

Sounds like you are stalling the aircraft. Watch your speed, in the Cessna keep it above 60kts.
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Re: plane crashes after take off

Postby sim » Sat Jan 26, 2019 2:06 pm

Set weather to a 60 Knot wind then point nose directly into wind. That way you'll never stall or crash unless you fly backwards :shock:

Seriously though it sounds as though your joystick is not recognised. Press keyboard "v" until you get helicopter or chase view and visually check aileron elevator and rudder are doing what they ought. If they are doing the business ok then junk that plane and try again etc etc. If the pile of junked planes exceeds 20 please step out of the cockpit so we can search it for bottles of gin. Hic! :wink:
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Re: plane crashes after take off

Postby Alant » Sat Jan 26, 2019 2:24 pm

As soon as it starts to roll, press "p" to pause the simulation.

Now you can , at leisure, try to find the cause.

Check the air speed indicator. It must at least 60 kts.
Go to an outside view and look at the position of he ailerons and rudder. Hopefully both will be near to zero.

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Re: plane crashes after take off

Postby dilbert » Sat Jan 26, 2019 2:45 pm

First, it would be helpful if Icoon0 would provide hardware, operating system, FG version, and type stick so we can figure out what's going on.

Second, something definitely is going on. The 172 was manageable on my I3 machine, but required constant control input to maintain straight and level (not all like the real bird, which flies like a truck). The DR-400 flew better, but seemed to have excessive directional instability.

On my ancient Celeron laptop, the 172 was nearly unflyable-frame rate of 5, lunging up and down, corkscrewing, and requiring constant control inputs, which were to much out of sync with the slow frame rate.

In contrast, the PA-28 maintained decent (stable) straight and level flight-even on the Celeron with it's 5 frame rate.
I think something has changed in the relationship between JSBsim and Flight Gear 2018.3.1. One
can easily observe all this in chase view.

Hopefully it can be unraveled. In the meantime Icoon0, see how the PA-28 and other YASIM aircraft do for you.
Best Regards :)
Last edited by dilbert on Sat Jan 26, 2019 4:52 pm, edited 2 times in total.
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Re: plane crashes after take off

Postby Octal450 » Sat Jan 26, 2019 3:03 pm

No, that's not true. Nothing changed like that.

You can try out my Warrior which is JSBsim, and just like the real aircraft I fly, some rudder input is all you need to counteract P factor and keep her straight and level.
http://www.github.com/it0uchpods/PA28-Warrior.git (remove -master from folder name after extracting)

Icoon0 needs to provide more info on what happens when he moved, his stick. If he moves it far one way, and nothing happens, I'd say his joystick isn't setup right. If something happens, then it means you aren't trimming it using rudder to counteract roll.

Kind Regards,
Josh
Last edited by Octal450 on Sat Jan 26, 2019 5:47 pm, edited 1 time in total.
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Re: plane crashes after take off

Postby dilbert » Sat Jan 26, 2019 4:41 pm

Sorry, I meant the PA 28 not the 24.
To Josh. That's just my uninformed observation. The F15 also seems to me touchier to fly than in the past, though I'd
have to install an earlier version of FG to make a definitive case. Best Regards.

P.S. According to my 25 year plus recollection, The real 172 had a flimsy little lever that fitted in a saw-toothed detente beneath the panel, which adjusted rudder trim.
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