SafeFlight AOA

How to keep the Cessna 170 flying and airworthy.

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Akashley
Posts: 2
Joined: Wed Jul 13, 2022 9:32 pm

SafeFlight AOA

Post by Akashley »

Hello Hello
I own a 52 170-B 180 hp that I flew from Anchorage to Florida last year.
It has a Sportsman STOL cuff and I want to install a SafeFlight AOA leading edge
Vane. I am looking for information from anyone that has done this and particularly
On the methodology used to find the Stagnation point. Thanks.
New member Ashley.
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n2582d
Posts: 2808
Joined: Mon Apr 29, 2002 4:58 am

Re: SafeFlight AOA

Post by n2582d »

Ashley,
Welcome!
Check out page 10 and Appendix A of Safe Flight’s Installation Instructions. I would think the position should be close to that called for by Sportsman for the original Safe Flight stall vane as seen in the attached template.
Click to enlarge
Click to enlarge
Gary
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GAHorn
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Joined: Fri Apr 12, 2002 8:45 pm

Re: SafeFlight AOA

Post by GAHorn »

While not making any suggestion as to personal choices of equipment for ones’ own airplane…. I point out that the 170-B model has as Required Equipment the Safe Flight Stall Warning System. (see TCDS A-799, Item 607). The Safe Flight AOA system does not replace this required system but may be installed in addition-to the original stall warning system. (see the AOA “Limitations” on pg 9.)
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons. ;)
voorheesh
Posts: 586
Joined: Tue Jan 04, 2005 5:22 am

Re: SafeFlight AOA

Post by voorheesh »

Doesn’t the safeflight AOA system under discussion here provide trend indicators on AOA that could have safety value beyond a simple stall warning? I remember the FAA recommended these systems a few years back and eased approval for their installation. Sounds like a good idea to me. Its also good to have the stall warning alert required by TCDS.
Akashley
Posts: 2
Joined: Wed Jul 13, 2022 9:32 pm

Re: SafeFlight AOA

Post by Akashley »

Hey! Thank you all for the information. It will be useful
And thank you Gary for the diagram. I couldn’t find the information that you referred to on page 10
But I will keep looking. I got more information from you all than I got from SafeFlight!!
Ha ! Ashley
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TFA170
Posts: 132
Joined: Tue Jan 26, 2016 3:18 am

Re: SafeFlight AOA

Post by TFA170 »

Like most (if not all) of these GA-oriented AoA indicators, they are only truly useful for one flap configuration. It would be nice to have a true AoA system available that self-calibrated based on flap position. Still, calibrating for a single flap position can be useful, particularly for STOL-type work. The problem becomes negative transfer if you often fly in other configurations as the calibration for full flaps would very likely show low speed or stall conditions when flown with less than full flaps.
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redacted
Posts: 96
Joined: Wed Jun 15, 2022 4:31 am

Re: SafeFlight AOA

Post by redacted »

Alpha Systems AOA has a way for electric and mechanical flaps to be incorporated into the algorithm. Personally I'd rather just have a switch I dial to my landing flap setting I'm going to use rather than monkey with attaching a potentiometer to my flap cables. But it's doable.
Nathaniel Perlman
1952 170B
N2282D S/N 20434
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