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Jonathan | 22 Jul 2004 03:30
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Installation Problems

I seem to be having problems compiling and running the Linux version of FlightGear.  After I compile everything and attempt to run the program I end up getting a segmentation failed error..  Many times dealing with freeing memory and deleting memory.  If anyone has any information about this please let me know.  Thank you,
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Jim Wilson | 22 Jul 2004 04:32

Re: Installation Problems

Jonathan said:

> 
> I seem to be having problems compiling and running the Linux version of =
> FlightGear.  After I compile everything and attempt to run the program I =
> end up getting a segmentation failed error..  Many times dealing with =
> freeing memory and deleting memory.  If anyone has any information about =
> this please let me know.  Thank you,

That sounds familiar. You can try the patch posted here earlier:

http://mail.flightgear.org/pipermail/flightgear-devel/2004-July/029641.html

Best,

Jim
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Jon Berndt | 23 Jul 2004 16:22
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default C-172 overspeed

I've noticed, again, that the default C-172 RPM is too high, and too fast. I could swear
that it wasn't this way in JSBSim CVS, but I could be wrong. I'll try and check this out
again.

Any input from others?

Jon
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Lee Elliott | 27 Jul 2004 23:23
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Aircraft 'nods' between narrow AoA range

Hi all,

To keep my hand in at modelling from scratch (as opposed to updating existing 
models or working on FDM/AP stuff), I've started on an English Electric 
Canberra B(I)8 - this is very similar to the early B-57A.

If I use a high altitude cruise data, I can get it to solve and fly reasonably 
well but there's a narrow range of speed/AoA where the a/c starts to 'nod'.

Where the speed is low enough that the AoA is higher than the upper critical 
value the a/c is stable and it's also stable once it's going fast enough that 
the AoA is below the lower critical value.

I haven't given specific values for the critical speeds/AoAs because I can 
vary them by tweaking various parameters but the range is always about 0.6-7 
deg.

If I use low-altitude data there's no problem, but then I'm pretty sure that 
the a/c wouldn't be able to get anywhere near it's operational ceiling - 
46500ft.  By todays standards the Canberra is a pretty low powered a/c - 2 x 
7500 lb thrust turbojets but it was nevertheless a good performer at 
altitude, and quite fast too - 620 mph (538 kt) at sea-level, I assume - the 
high-alt values I found, and which I'm using are 470 kt at 40000 ft.

Can anyone shed any light on what might be causing this 'nodding'?

For those who're interested, http://www.b-57canberra.org/labs_detail.htm gives 
some info on the Low Altitude Bombing System (LABS) technique, which was used 
with Canberras and B-57s.

Basically, it involved approaching the target at 425 kt and 1000 ft agl, 
initiating a 3.5 G pull-up and then releasing the bomb when the gyro tumbled 
i.e. vertical:)

LeeE

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Gmane