Cessna 10 yaw

M

mgchrist5

Charter Member
Hello everyone,
I recall a post on the "old" Outhouse forums (ie: pre server-crash) regarding a aircraft.cfg modification to nullify the seemingly excessive p-factor/yaw on takeoff with the excellent Cessna 150 available at the following:

http://www.fs-tutorials.com/en/down_planes.php

Any recall? Thanks in advance for any assistance! I don't claim to be an expert in any way, but with about 55 hours in C-150/152s, I can safely say the p-factor at takeoff definitely seems way too strong. Otherwise, an absolutely superb a/c!!!

Happy 2010 to all!

:ernae:
 
I am not 100% certain on this, but I think you can make the adjustment in the [FLIGHT TUNING] section of the aircraft.cfg. Look for:

p_factor_on_yaw= X

Try reducing the number to a smaller number and see if that makes it better. Make sure to make a back up copy of the aircraft.cfg before making any changes.

OBIO
 
It was also a freeware Mosquito and the default DeHavilland Comet that suffer this problem. I've encountered one or two others and have tried the P-factor fix without success. Perhaps there is a value range to that line, I know of some that only recognize a range of numbers. I tried moving engines, fuel and payload locations too. I love the 150 and can coax it up with a gentle nudge of the throttle or tap of the brakes on roll out.
Here's a question; do model files only recognize specified cfg lines? I tried to add an elevator trim line to an aircraft and it never seemed to respond to the addition. Just wondering.
 
I am downloading the Cessna to have a look ... back in a bit hopefully with some help.

EDIT: The issue is the engine location statement in the aircraft.cfg file.

Original: engine.0 = 6, 0.5, -0.5,

Replace with: engine.0 = 6, 0, -0.5

Note that the engine thrustline is offset from centerline by 6" or 0.5' to the right. This was causing the initial pull to the left on the roll.
 
I tried moving the engine position but maybe I didn't persevere enough. I also wasn't sure, if I moved the engine to the left would the plane yaw right or vice versa? I was trying to recall my physics. Then I got to thinking maybe I needed to adjust the longitudinal position as well but I really don't know how those numbers would act on a non-tangible thing like a FS aircraft. I often forget it's all just numbers directing an image on a screen, but that's the power of the FS world eh?
Good luck Milton.
 
Original: engine.0 = 6, 0.5, -0.5,

Replace with: engine.0 = 6, 0, -0.5

Note that the engine thrustline is offset from centerline by 6" or 0.5' to the right. This was causing the initial pull to the left on the roll.
Click to expand...

Ah ha! That's the ticket. Thanks so much, Milton...and thanks everyone else for all the replies.

Happy 2010! :ernae:
 
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