On low weight landings?

[proletariat23]

The girls has a big tank, but when she's empty her rear end has nothing to ballast it, so any landing under 1000lbs will end in a nose wheelie.

 

Anybody have any suggestions. I've been reading sukhoi documentation, there is no mention of this . Try it out.

[Crew Dog]

Can't say I've noticed a tendency for the big girl to nose sit, but then again I'm usually inbound with approx 3000 Kg of gas. I'm assuming that you also meant Kg for your fuel load. Besides that, how was your frame configured? Was she slick or loaded? How were your trim settings? Do you have a track showing her snapping down?

[Frostie]

The 1st rule of Flanker club is trim.

[Ironhand]

The girls has a big tank, but when she's empty her rear end has nothing to ballast it, so any landing under 1000lbs will end in a nose wheelie.

 

Anybody have any suggestions. I've been reading sukhoi documentation, there is no mention of this . Try it out.

Can you post a short track? I've never noticed the tendency, even in a deadstick, no weapons landing due to zero fuel and you don't get much lighter than that.

[DarkFire]

The 1st rule of Flanker club is trim.

 

Rules of the Flanker Club:

 

1) Thou Shalt Trim.

 

2) Always trim.

 

3) See no. 1 & no. 2.

 

In all seriousness, this is probably a trim issue. If you have a lot of nose-high trim, perhaps due to a low landing speed, then there can be a tendency for the aircraft to maintain a nose-high attitude after the main gear has touched down, but I have to say the one and only time I've ended up dragging the tail after touch down was due to being seriously over-weight on landing as opposed to being light.

 

Attached is a test track (apologies, first time I've flown in about a month, and it shows :disgust: ) in which I landed with about 350 - 400Kg of fuel remaining. I didn't experience any nose-high tendency, but then I'll admit to being lazy and I normally drop the nose after touchdown by using the pitch trimmer rather than stick input.

[Crew Dog]

The girls has a big tank, but when she's empty her rear end has nothing to ballast it, so any landing under 1000lbs will end in a nose wheelie.

 

Anybody have any suggestions. I've been reading sukhoi documentation, there is no mention of this . Try it out.

 

OP is saying she's pitching so ONLY the NLG is on the deck. I will say it's 99.99999% an improperly trimmed jet, simply because there's no way the engine weights alone would not be enough to keep the mains on the ground in a neutral trim.

[Frostie]

Basically, if you

Take off.. Trim

Adjust power.. Trim

Make a turn.. Trim

Fire a missile.. Trim

It starts raining.. Trim

You pass wind.. Trim

[proletariat23]

She's a big lady, and she needs to be trimmed. Got it. I will post a track for the lols, what you've never nollied into a fuel truck before? When I'm home I'll upload a track file. I also noticed I landed with nothing and about 500kg and she back wheelies, so I'd bet you're all right.

 

Thank you for the responses and help, you're all top kek.

[DarkFire]

She's a big lady, and she needs to be trimmed. Got it. I will post a track for the lols, what you've never nollied into a fuel truck before? When I'm home I'll upload a track file. I also noticed I landed with nothing and about 500kg and she back wheelies, so I'd bet you're all right.

 

Thank you for the responses and help, you're all top kek.

 

Out of interest, what sort of speed are you touching down at?

[proletariat23]

Always below 280 kph, I watched the sukhoi documentary and the soviet pilot Sergei brevokin says "is plane, not race car." I never forgot that. I overwrote the track file with the nose wheelie death on accident trying to export it and watch it . Boo

[OnlyforDCS]

While we are on the subject of trimming, do any of you guys use the "stick to trimmer" option? I find it quite useful, but not very precise. It gets the job done, for the coarse trimming. Unfortunately I don't have another hat on my joystick to asign to a trimmer. Anyone have any tips on how to get past that limitation?

[Ironhand]

Always below 280 kph, I watched the sukhoi documentary and the soviet pilot Sergei brevokin says "is plane, not race car." I never forgot that. I overwrote the track file with the nose wheelie death on accident trying to export it and watch it . Boo

For very low weights (fumes for fuel and no weapons), you should actually be touching down around 240 or so.

 

While we are on the subject of trimming, do any of you guys use the "stick to trimmer" option? I find it quite useful, but not very precise. It gets the job done, for the coarse trimming. Unfortunately I don't have another hat on my joystick to asign to a trimmer. Anyone have any tips on how to get past that limitation?

I've played around with it a bit but find that even the keyboard trimming keys are a better option. They'll get me close to correct more quickly. But I use the second hat on my X52 for trimming which is even better. The key commands work well enough, though I haven't tried them tied to a joystick. Without a 2nd hat switch, that might be your only option.

 

I forget which direction it is (up or down) but she always trims a bit more in on direction than the other. So, when using the keyboard, I use usually go just past the correct setting with the "fat" trim and come back to it with the "lean" one.

[DarkFire]

Always below 280 kph, I watched the sukhoi documentary and the soviet pilot Sergei brevokin says "is plane, not race car." I never forgot that. I overwrote the track file with the nose wheelie death on accident trying to export it and watch it . Boo

 

Fair enough. The reason I asked was that I wondered if you were landing at a very slow speed which could potentially produce a high-AOA situation of some sort on touch down. FWIW I usually come over the runway threshold at around 280 and land at anything between 220 - 260 depending on how heavy the bird is, wind direction etc.

[DarkFire]

While we are on the subject of trimming, do any of you guys use the "stick to trimmer" option? I find it quite useful, but not very precise. It gets the job done, for the coarse trimming. Unfortunately I don't have another hat on my joystick to asign to a trimmer. Anyone have any tips on how to get past that limitation?

 

Tried it a couple of times and didn't like it that much. To be fair it's useful as a quick, coarse adjustment but stick-to-trimmer makes it difficult to make fine adjustments. I suspect that it's much more useful for people who use sticks that have extensions.

 

Personally I've mapped one of the hats on my stick to the trim controls and find that it works well enough.

 

Might be worth you trying stick-to-trimmer for coarse adjustments and then mapping something like the arrow keys to the trim keys for fine adjustments.

[OnlyforDCS]

 

Might be worth you trying stick-to-trimmer for coarse adjustments and then mapping something like the arrow keys to the trim keys for fine adjustments.

 

Will try that. Thanks.

[*Rage*]

To fly the su27 effectively you have to be constantly trimming. Like all the time. Even in the real su27 it is the most worn out hat:) I don't find the stick to trim function that great so if possible try to assign at least pitch trim to a hat switch. It's probably more important than radar selection etc..