Jump to content

Nose heavy on rotation?


Corrigan

Recommended Posts

Is it supposed to be this hard to pull up smoothly on take-off? Even with my extension on the warthog it's hard to pull up through the 13 degrees to the top of 3 degree poles smoothly. A few degrees nose up trim helps but I still end up with no give, and then suddenly going too far.

 

Thoughts?

Win10 x64 | SSDs | i5 2500K @ 4.4 GHz | 16 GB RAM | GTX 970 | TM Warthog HOTAS | Saitek pedals | TIR5

Link to comment
Share on other sites

Is it supposed to be this hard to pull up smoothly on take-off? Even with my extension on the warthog it's hard to pull up through the 13 degrees to the top of 3 degree poles smoothly. A few degrees nose up trim helps but I still end up with no give, and then suddenly going too far.

 

Thoughts?

Takeoff pitch trim setting seems to have a big impact on rotation behaviour. Havent done any serious testing on it but thats the impression i get having practised more than 200 takeoffs and landings. I find that starting the pull back a couple of seconds before reaching rotation speed helps alot.

Link to comment
Share on other sites

Am I really the only one that feels that the aircraft is a struggle to get off the ground smoothly?

 

Have you tried to start a pull back at around 250km/h and as it eases off on nose gear, gently easing the stick forward? I should add that 99% of my takeoffs so far has been with no payload or only x tank...

Link to comment
Share on other sites

  • 3 weeks later...
Am I really the only one that feels that the aircraft is a struggle to get off the ground smoothly?

 

 

No, I feel this too, it's impossible to start rotating before a certain speed, it's like elevons doesn't have authority before that speed. If you pull the stick full aft as soon as you start, nothing will happen until you suddenly have your nose looking at the sun :)

So to take off smoothly I need to apply pitch up after this speed. If I start pulling before I tend to pull too much.

Link to comment
Share on other sites

Am I really the only one that feels that the aircraft is a struggle to get off the ground smoothly?

 

Same feeling here. Though, as reported by others, trim up helps.

Mainboard: ASUS Maximus X Hero Intel Z 370

CPU: Intel Core i7-8086K @ 4.0 GHz

Memory: 32GB Corsair Dominator Platinum DDR4-3000

Graphics Card: ASUS NVIDIA GeForce RTX 3080 10GB

Monitor ASUS PA 329 32" @ 4K

1 SSD Samsung 860 PRO 256 GB

1 SSD Samsung 860 PRO 4 TB

Windows 10 - 64 V. 2004

CH Pro combatstick, throttle and pedals

Link to comment
Share on other sites

No, I feel this too, it's impossible to start rotating before a certain speed, it's like elevons doesn't have authority before that speed. If you pull the stick full aft as soon as you start, nothing will happen until you suddenly have your nose looking at the sun :)

So to take off smoothly I need to apply pitch up after this speed. If I start pulling before I tend to pull too much.

 

This is wrong, then. Surface authority should turn-on smoothly with airspeed obviously.

Win10 x64 | SSDs | i5 2500K @ 4.4 GHz | 16 GB RAM | GTX 970 | TM Warthog HOTAS | Saitek pedals | TIR5

Link to comment
Share on other sites

Nose heavy on rotation?

 

This is wrong, then. Surface authority should turn-on smoothly with airspeed obviously.

 

 

 

You can always try to do a aerodynamic brake when landing:

-Softly raise nose to max alpha 16

-put nose wheel on ground at about 160kmph

- steer and wheel brake

- reverse if needed

 

Do it with a clean ac with less than 80% fuel.

Link to comment
Share on other sites

This is wrong, then. Surface authority should turn-on smoothly with airspeed obviously.

 

If the main gear is far back on the aircraft (think naval planes, then remember how the Viggen is designed to be landed), the nose will be essentially unresponsive below rotation speed and extremely sensitive above rotation speed.

 

This is something the F-4 was absolutely notorious for. For a reasonable takeoff run you pulled the stick to the aft stop and waited until Vr, at which point the nose would shoot up without warning. You had to let the stick forward a considerable amount to avoid a tailstrike. So it's not unheard of. Just takes lots of practice to perfect.


Edited by Pocket Sized

DCS modules are built up to a spec, not down to a schedule.

 

In order to utilize a system to your advantage, you must know how it works.

Link to comment
Share on other sites

Okay, well, fair enough. I should perhaps add that my experience is limited to simulated aircraft (and common sense + physics degrees). It's just that I've not seen anything mentioned in the SFI about this being an issue.

Win10 x64 | SSDs | i5 2500K @ 4.4 GHz | 16 GB RAM | GTX 970 | TM Warthog HOTAS | Saitek pedals | TIR5

Link to comment
Share on other sites

Doesn't the canard flaps create a nose up and that's why the elevons are dropped to counteract this? If so, when you give stick aft the canard flaps should make the nose go up?

Either way, with zone 3 you should according to the SFI be able to rotate at 190kmph, if you are low weight it is even less but the restriction is 190.

Link to comment
Share on other sites

Yes, the flaps create a nose up moment. Without them, the nose would be even heavier during the takeoff run ;)

 

The current behavior is believable in my opinion but I have no idea if it's accurate to the Viggen.

DCS modules are built up to a spec, not down to a schedule.

 

In order to utilize a system to your advantage, you must know how it works.

Link to comment
Share on other sites

Okay, so I can see two issues here. First, the suddenness with which the plane is willing to rotate, which I can kinda see as plausible now as per Pocket Sized's post.

 

The second issue is that the plane does not rotate when it should according to the SFI, as outbaxx has found.

Win10 x64 | SSDs | i5 2500K @ 4.4 GHz | 16 GB RAM | GTX 970 | TM Warthog HOTAS | Saitek pedals | TIR5

Link to comment
Share on other sites

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...