OnSPeed AoA Question

[sdmccorm]

Chaps-

 

What is the damn secret to getting my Aircraft setup in 'OnSpeed AoA" ? I've watched the videos, read the articles, and spent a lot of time in the cockpit and I think I've got to be missing something.

 

Look at the attached Picture. Let's just use this for an example. I've got the Velocity vector (VV) right on the horizon, the E-bracket above the horizon, and I'm at 140 kts. So right now - what the hell do I do to get the VV in the middle of the bracket - but yet stay level?

 

Do I pitch up? Do I never touch the pitch and only ever trim once gear/flaps are down? My god all I keep doing is chasing that damn bracket up and down the screen while my nose just bounces back and forth. If I manage to get the VV in the E bracket, then I'm 10 degrees below the damn horizon. Then, when im below the horizon but on AOA, what do I do to get back to level flight but remain onspeed AOA? Every time I touch the throttle or the stick my VV and bracket go their separate ways and back I go to fighting it again.

 

When you guys say "trim", are you applying 1 or 2 taps of the trim or are you TRIMMING hard?

 

Whats the secret to quickly getting the VV in the E-bracket and staying level at a cozy 130-140 kts? I'm sure Im making this harder than it should be, but for the love of all that's holy, what is the secret?

 

Preciate any tips.

 

Mack

[kylekatarn720]

Just decrease your speed

 

Edit: AoA indexer is just trying to get you flying at a certain AoA which should be 8.something iirc. So as you can see on your hud, right next to the alpha symbol your current AoA is 4.1

 

Edit2: Just checked it, it needs to be between 7.4 and 8.8.

Edited June 12, 2018 by kylekatarn720

[probad]

dont chase the bracket

 

you need to command the bracket's movement with your throttle instead

[IvanK]

Use power and or Drag to initially get the bracket on the VV. With Flaps HALF/FULL trim to stick free then depending whether you are a Fishhead or crab decided on your methodology

 

 

 

 

Fishhead = Stick for AOA Power for flight path

 

Crab = Power for AOA Stick for flight path

Edited June 12, 2018 by IvanK

[kidogofoto]

Keep in mind that Onspeed AoA is meant for a descending trajectory towards a runway or the deck of a carrier, not to fly level.

 

I do it like this:

1. Throttles back and decrease muy speed to about 150

2. 'Feel' the stick by pitching a little so I get a sense of how much trim to apply

3. Apply trim down so the nose goes up. It's quite some that you need to apply. Two seconds on the trim might just do it

4. Meanwhile, go rocking the throttles

5. Trim until the flight path indicator meets the center of the E bracket

6. Now you are trimmed. Don't apply any more pitch with the stick, just roll if you vere off to left or right

7. Trim a little more if you see the fpi drifting away from center of the E

8. Now, just play with the throttles to point your fpi (flight path indicator) on the touchdown point vertically and roll with the stick for horizontal control

 

Hope this helps.

 

Verstuurd vanaf mijn SM-G935F met Tapatalk

[David OC]

I have some great simple info about all this In this thread sdmccorm

 

Including a simple video of what you should be practicing before case 1.

 

(Slow Speed Practice) Onspeed AOA Video - Getting ready for Case 1 Landings

 

 

 

The big secret about this technique is once the speed drops close to "around" the 140 kts DON'T let it drop much more until your are close to on speed AOA.

 

Be ready to catch her with the throttle.

 

Bring the throttle back on and keep it pumping between 40% to 90%, this will keep her spooled up and in the power. Think of it like a turbo, if a turbo drops down to low it takes time to boost back up. The other secret is that flying on speed approach is setup in the downwind wings level and in level flight. This is when you get the most accurate on speed trim setting that the aircraft will seek after you come out into the groove wings level, it wants to seek and return to this trimmed on speed setting when in the downwind.

 

This is re-trimmed if doing touch and go's or for a bolter in the downwind, as you will be lighter on the next downwind because of less fuel each time.

 

Don't get me wrong you can start to trim when coming into the downwind, once on the downwind wings level is when to really get it trimmed out well for roll out into the groove.

 

.

Edited June 13, 2018 by David OC

[doodenkoff]

I've been fighting this too, but here's something I've learned; when you're working your throttle, don't wait to see the velocity vector and/or the E bracket respond before going the other way with the throttle. It's like holding a hover in a Huey, you should feel like the airframe is reacting when you're already on to your next adjustment.

[sdmccorm]

Thanks folks. All good info. Great video. This was the key for me.

 

5. Trim until the flight path indicator meets the center of the E bracket

6. Now you are trimmed. Don't apply any more pitch with the stick, just roll if you vere off to left or right

7. Trim a little more if you see the fpi drifting away from center of the E

 

I didn't understand or know what "properly trimmed" meant.

 

It's all about trimming to get that velocity vector right on that Bracket center line- and then all throttle from there to move the vector to the landing spot.

 

Also, as stated, you can't react to the bracket moving, you gotta anticipate a bit with that throttle. But once trimmed - THEN moving the throttle pushes the VV and Bracket up and down together. It was getting that Vector in the bracket using trim that was the fundamental error and was what I wasn't doing correctly.

 

And another thing - don't under estimate the amount of trim you need - it ain't a simple press or two - you're holding it down for full 1-2 seconds. Experiment.

 

One last question. How do I keep the angle of attack displayed on the HUD? I see it when I start - then as I'm making adjustments, it disappears until touchdown. Is there a keystroke to always keep that AOE alpha symbol on the HUD?

 

Many thanks to all for the suggestions.

 

Mack

Edited June 13, 2018 by sdmccorm

[David OC]

Are you talking about it drifting off the HUD with the flight path marker because of wind?

 

You can Cage the Hud to keep it centered, you will see a ghost flight marker off to the side where the wind is taking you, this is used in the pattern, especially on the crosswind turn to the groove, once in the groove you can uncage the hud or not.

 

This should be bound to a hotas button (Throttle).

 

 

Also if you are doing airfield landings, to land on a runway with around 3 degree glide slope, use your TACAN for distance and be at 1500 feet at 5 miles level and on speed AOA or 3000 feet at 10 miles.

 

Another way is off your sink rate

 

Also, If you want a 3 degree glide slope take your air speed multiply it by 10 and dived that number by 2. That will give you the sink rate you need for a 3 degree glide slope. For example 135 knots * 10 = 1350 / 2 = 675. So at 135 knots you should be looking for a sink rate of -675 to be on a 3 degree glide slope.

 

.

Edited June 13, 2018 by David OC

[pacotito]

I've got that too. Haven't noticed exactly when the aoa display on the HUD goes away. When the fpi gets close to or into the bracket the aoa display disappears from the hud.

[IvanK]

The Digital AOA is removed once the bottom or top of the E bracket reaches the VV wing. If you are "bracketing" the VV digital AOA is removed