Typhoon torque

S

sjrichardson

SOH-CM-2024
Hi All – can anyone help with this query?

I still love the old Alphasim Hawker Typhoon, but there’s one realism issue I’d like to crack. The propeller turns the correct way (clockwise as seen from the front), but on take-off the plane swings to port like a Merlin-engined Spitfire and needs lots of right rudder and trim, whereas it should swing to starboard like a Griffon-engined Spitfire and should need lots of left rudder and trim.

Just Flight’s Tempest from their Spitfire and Tempest package has a similar problem, as did Just Flight’s original Griffon-engined Spitfires, but they corrected it in one of their update patches.

I suspect it needs a tweak to these planes' aircraft.cfg files, but I admit I don’t know much about this sort of thing or where to start. Has anyone done this already or have any ideas, please? Many thanks.

Simon.
 
Simon

I have the Alpha Typhoon installed...and it has been tweaked and tweaked some more...let me fire it up and see how it prop torques. If it torques to the right instead of the left, I will compare the config and air files to the original and find what is different and let you know.

OBIO
 
I checked the tweaked Alpha Typhoon, and on take off (full power, flight set to HARD with max difficulty) the plane swung to the right. I checked the stock Alpha Typhoon....same thing....it swung to the right. I tested both planes a number of times....going from a dead stop, going full throttle and the planes swung to the right each time.

OBIO
 
Check the .cfg file, the prop rotation should have a minus sign in front of it to make the prop turn the "wrong" way.

T
 
Thanks very much OBIO and Fliger 747 for checking this one out - much appreciated.

Now I'm really puzzled that OBIO's stock Alpha Typhoon swings correctly to the right whereas mine still persists in swinging left. I've reinstalled the plane from the original download and am using the same realism settings as him in FS9 - hard flight model, realistic torque, gyro settings etc. From standstill and on full power, it goes just slightly to the right for a few yards up to about 25 kts and then swings strongly left all the way to take-off.

As a cross-check, all my Merlin-powered planes swing left as they should, and the David Hanvey Tempest VI and Just Flight's Griffon-engined Spits all swing correctly to the right.

I've changed the prop rotation in the aircraft.cfg as Fliger747 suggests and that does indeed reverse the torque effect, albeit with the propeller visually turning the wrong way - that's really tough for a reality freak to bear! I've put a similar line in the .cfg for the Just Flight Tempest V and that worked too - again at the expense of the visual prop rotation.

Still can't work out why OBIO's stock Typhoon behaves itself and mine stubbornly won't! Happy to believe it's something I'm not doing right. Answers on a postcard.....

Simon.
 
I did some more testing...and like yours, mine initially pulls to the right, but once some airspeed is built up...it suddenly and STRONGLY pulls to the left. That is the stocker. Let me do some additional testing on the tweaked one.

The tweaked Typhoon does the exact same thing. Let me take a look at the contact points and such and see if I can figure it out. I once had a plane that pulled to one side strongly due to one contact point being set lower than the other, so basically the plane was leaning to one side.

Nope...not due to mix matched contact point settings.

OBIO
 
Question for either of you. In S&L flight, and more or less stable without AP, does the aircraft tend to yaw one way or the other? I ask because I once had trouble with a Piper Cherokee which would pull left, I think, on takeoff. Then in flight when I got it flying like above and went hands off, it would slowly yaw to the left. Crude or incorrect though it may have been, I fixed it by adjusting the engine location just a half a hair laterally until the in-flight yaw zeroed out. It still yaws a little on full power so I didn't totally undo that expected effect. Now perhaps the aircraft was meticulously created to ultimate realism and I should have applied rudder trim to correct the authentic torque, I can't say but it flies just fine now.
 
One note on how FS behaves. A plane with a clockwise prop, from the cockpit will normally pull left, requiring right rudder on takeoff. In FS will intially have a minor pull in the "wrong" direction. Most of the WWII type torque monsters seem to have maximum pull at around 45 knots, when finally the rudder starts to have really good effectiveness.

Cheers: T
 
Thanks all, and especially thanks OBIO for doing yet more testing. In a way I'm relieved your ALPHA Typhoon behaves like mine - I was starting to think I must be doing something wrong!

Maybe in this instance it's a case of having to choose between the correct torque effect or the correct propeller direction of rotation. If the latter, then at least once the engine's running you don't notice that the prop's going the wrong way - you only have to shut your eyes or look away during startup and shutdown.......

Simon.
 
ChecK to make sure that the p factor is not a negative number. Shouldn't be but you never know. Once saw a plane that would accelerate when the brakes were applied, brake scalar was a negative number, so hence negative brakes....

T
 
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