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11-17-2013, 02:01 PM
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Join Date: Aug 2006
Location: Secluded Lake,Alaska (AK49)
Posts: 359
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Nice
Quote:
Originally Posted by N941WR
I never look at the graphical depiction but rely on the audio beeping, which grows as you approach the stall. It is good enough that I would forgo the weight and complexity of the stall warning that Van's now ships with the kit.
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Very interesting. Does it beep beep progressively faster until a single tone at stall?
My intention is to get it flying as low cost as possible, (probably with glass), and add features as experiance and funds allow. I can take the weight hit on the little nose riblet sender mount, and just pull the sender and wires once the pitot is upgraded and AOA added.
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11-17-2013, 02:19 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by Andrew M
Very interesting. Does it beep beep progressively faster until a single tone at stall?...
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Yes, that is exactly what it does.
Order the Gretz mount. It works great with the Dynon Pitot and allows you to adjust the pitot up or down, as needed. A bit costly but well worth it!
You will also need to run both a pitot and AoA line from the wing into the fuselage. For that I went with the Safe Air 1 kit, including their static port. The only change I made was to mount their static port on the outside of the fuselage.
The only catch is that if you are going to install a SkyView, the pitot and AoA lines need to be run into the tailcone. (Mine go under the seat pan and baggage compartment.)
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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11-17-2013, 02:59 PM
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Join Date: Sep 2010
Location: Charlotte NC
Posts: 1,166
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Afs recommends 1.15 above actual stall speed for the angle alert. When you calibrate the unit you can set it to the value you want. If yours is set to 1.3 I would lower it since you would be getting the warning near normal approach speed. You want the warning to come on when you have clearly allowed the aircraft to get slower then desired not as a matter of routine. In the rv6 a full stall landing has the tailwheel touching down before the mains so most 3 points are slightly above stall and that is where I get the warning. If I hear it anytime other then in the flare I know I have done something very wrong and a immediate correction is required.
I agree on a option for a graduated warning however it's not available on the AFS. It is however measuring actual AOA. Many of the other units are giving a derived AOA by measuring AS and G force. If you had a AS failure you would not be able to use the AOA as a backup on those units as you can with the system from AFS.
Now I just need to figure out how to get it to stop talking while rolling out. It gets old trying to hear tower instructions over her voice. I think the dynon version giving actual AOA does a better job in this regard.
George
Last edited by sailvi767 : 11-17-2013 at 03:04 PM.
Reason: Addition
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11-17-2013, 03:08 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by sailvi767
...Now I just need to figure out how to get it to stop talking while rolling out. It gets old trying to hear tower instructions over her voice. I think the dynon version giving actual AOA does a better job in this regard.
George
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George, check your manual, the SkyView has a setting to turn the thing off when the speed dropped below an adjustable limit.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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11-17-2013, 04:03 PM
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Join Date: Sep 2007
Location: BC
Posts: 1,674
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Quote:
Originally Posted by sailvi767
Now I just need to figure out how to get it to stop talking while rolling out. It gets old trying to hear tower instructions over her voice. I
George
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Put a toggle switch in the audio out line and label it "AOA audio".
Bevan
__________________
RV7A Flying since 2015
O-360-A1F6 (parallel valve) 180HP
Dual P-mags
Precision F.I. with AP purge valve
Vinyl Wrapped Exterior
Grand Rapids EFIS
Located in western Canada
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11-17-2013, 04:07 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by Bevan
Put a toggle switch in the audio out line and label it "AOA audio".
Bevan
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Only one problem with that, when the NTSB performs the post crash investigation they will be sure to mention the "AOA audio" switch was found in the "off" position. Better to turn it off when the airspeed is below a preset level, a level that is well below the stall, like 35 Kts.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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11-17-2013, 04:27 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
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Quote:
Originally Posted by N941WR
George, check your manual, the SkyView has a setting to turn the thing off when the speed dropped below an adjustable limit.
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As do all the other Dynon EFIS, Even my lowly D10A.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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11-17-2013, 06:08 PM
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been here awhile
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Join Date: Dec 2004
Location: North Alabama
Posts: 4,301
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hybrid AOA
I have an AOA setup that may be of interest to those with the mechanical LRI system. This is a great backup system because it is independent of aircraft power and pitot. The aircraft can be safely landed with only the LRI and no other instruments.
http://thervjournal.com/liftreserve.htm
However, there is no audible alarm--unless you also have a Dynon in the panel. I found the LRI probe will drive the Dynon AOA display very nicely. So now I have the LRI mechanical display and also the audible alarm originating in the Dynon. The Dynon AOA port is simply teed into the LRI low-pressure line. The LRI is calibrated as usual by flying stalls and adjusting the probe angle until the indicator reads as desired, then the Dynon calibration routine is run. Works like a charm.
Last edited by Sam Buchanan : 11-17-2013 at 06:12 PM.
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