rfresh

I've read some conflicting info on what the 0 and the 1.0 index marks represent on the AOA indicator shown in the attachment.

The Citation manual says 1.0 represents the wing achieving 100% lift. That confuses me. That's in the red zone and at 1.0 you're in a full stall condition (assuming you can even get there before falling out of the sky).

Thus, 0 must be the wing developing 0% lift. Again, confusing to me since that is shown being in the green zone.

Somewhere else I read that 0 represents 100% wing lift and 1.0 represents a 100% stalled wing.

Can someone shed some light on how you read these extreme ends of the indicator?

Thank you...

galaxy flyer

You had right in the first place—1 equals 100% of possible lift, a stalled condition for all intents and purposes, hence red. 0 equals zero lift, zero G, green because the pilot has lots of available lift. Lots of good times in the Slotation! Loved having the heads-up AOA lights

GF

rfresh

I still don't get it. How can 1.0 indicate 100% lift if the wing is stalled? 0.9 means I'm developing 90% wing lift, yet I'm in the red, not a good thing, and past 0.8 which is stall buffet.

I guess my brain is wired backwards on this. To me, 1.0 means I'm in a 100% stall condition (no lift or not enough lift to maintain flight). 0 means I have a 0% stall condition/AOA therefore I have maximum lift being generated. As the AOA increases from 0 lift decreases as stall % increases.

I'm not saying you are wrong, I'm just saying, it has not clicked yet in my brain.

galaxy flyer

It’s about percent of lift, not stall condition. It might be more accurate to say 1.0 isn’t completely stalled, but the point of maximum AOA before the stall angle is reached which is also maximum lift. At 0, the wing isn’t producing any lift, it’s zero AOA.

GF

rfresh

>It’s about percent of lift

Hmmm...that helps...thanks...

Mink

Not to trying to be a smart a$$, but if you can get your hands on a copy of “Aerodynamics for Naval Aviators” you’ll find great info about AoA, lift curves, powers curves, etc.

Might help makes sense of what the AoA gauge is telling you.

USMCFLYR

Refresh -

See if this helps.

In the F/A-18 - 35 AOA would have been the equivalent of 1.0 on that gauge. Still not stalled because the Hornet could go far past that without stalling, but past 35 AOA, I was on the bad side of the L/D MAX (basically had gone past my point of maximum lift generation.

It isn’t.t where I would have normally chosen to fly for most operations but if you were trying at a moment in time to MAX PREFORM - that is where you went.

That could go all way down to -10 AOA which was the MAX energy addition AOA; could be related to 0.0 on your gauge.

Some others:
Max range - 4.2
Max endurance - 5.6
On-speed for landing - 8.1
Max energy sustaining - 25.0

So there are multiple different AOAs used for different regimes in flight.

Now I know nothing about your Citations AOA gauges or how they are calibrated, but maybe my examples might help you understand a little.

rfresh

I will check it out...thanks...

BoilerUP

Citation AOA for dummies: Keep it in the green, don't go past 'the hat'.

Seriously, AOA is fantastic and idiot-proof (regardless of graduations); I cannot believe dual independent AOA gauges (not tapes, not lines, not donuts, but gauges) aren't required on all Part 25 aircraft.