AOA indicator poll.

On Tuesday, May 19, 2020 at 9:54:55 PM UTC-6, SoaringXCellence wrote:
Luc,

Have you looked at the AOA indicators that are currently used in the GA fleet (mostly experimental aircraft)? There is a "standar" (sort of) depiction of the Aoa that you might want to follow.

https://www.aircraftspruce.com/menus...ndicators.html

Most of these use similar patterns to indicate approaching the stall. The center blue dot could be the optimal glide angle for a glider. Many of these systems also have an aural component that aggressively announces "PUSH" if you don't respond to less insistent prompts.

I'm not sure we need multiple ways to demonstrate the same phenomenon.

Mike

I don't mean to be "that guy", but how is this different from a side-mounted yaw string (functionally, that is)? Some pilots mount a yaw string to the side of the canopy which has a vertical excursion, which indicates relative angle of the wind. With a stripe of electrical tape laid out on the inside of the canopy at the angle of stall, this should give you the same information at a much reduced cost, I would think.

On Tuesday, May 19, 2020 at 11:32:56 PM UTC-6, John Foster wrote:
On Tuesday, May 19, 2020 at 9:54:55 PM UTC-6, SoaringXCellence wrote:
Luc,

Have you looked at the AOA indicators that are currently used in the GA fleet (mostly experimental aircraft)? There is a "standar" (sort of) depiction of the Aoa that you might want to follow.

https://www.aircraftspruce.com/menus...ndicators.html

Most of these use similar patterns to indicate approaching the stall. The center blue dot could be the optimal glide angle for a glider. Many of these systems also have an aural component that aggressively announces "PUSH" if you don't respond to less insistent prompts.

I'm not sure we need multiple ways to demonstrate the same phenomenon.

Mike

I don't mean to be "that guy", but how is this different from a side-mounted yaw string (functionally, that is)? Some pilots mount a yaw string to the side of the canopy which has a vertical excursion, which indicates relative angle of the wind. With a stripe of electrical tape laid out on the inside of the canopy at the angle of stall, this should give you the same information at a much reduced cost, I would think.

It does seem like a pretty cool idea though, if you want to spend the money for it and not clutter the outside of your canopy with more than one string.

Hi John...

The side string is perfectly Ok... As long as the middle string is perfectly centered.

Even a slight slip will disturb the side strings too much to have an useable indication. And it is very unlikely that you enter a stall by chance while flying straight with a perfectly centered string.

The electronic instrument seems to be much less sensitive to that: Presently I'm using the pitot + static of the fuselage, plus the centered pressure port under the nose and it is Ok... I should check by using the antenna pressure to confirm...