Home > VansAirForceForums

- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

Old 07-12-2018, 10:41 AM
jliltd jliltd is offline
Join Date: Sep 2013
Location: Rancho San Lorenzo
Posts: 358

Dynamic pressure is what is desired for IAS. Since only dynamic pressure directly correlates to speed. However dynamic cannot be directly measured and has to be derived by subtracting the static pressure from the total pressure (pitot). So the third port on an Dynon might be a direct reading AOA or some such but probably not dynamic. I have an Aspen in the box so I will check it out but I am pretty sure it is only two ports.

Reply With Quote
Old 07-14-2018, 05:04 PM
Jeff Bethel Jeff Bethel is offline
Join Date: Jul 2018
Location: Albuquerque, NM
Posts: 1
Default AV-20 Ports and AoA

Hi Guys,

The AV-20 uses an algorithm actually developed/patented by Sperry - I don't know if it's the same as used in the Aspen as that was done after I left. It uses sensors (lots of them), but does not require a physical AoA probe. We've flow it against several AoA systems and it's identical in performance. I've added a short description of how it works in the FAQ section at

The two ports are for pitot and static. Power and ground are the only other two connections required. All others are optional.

Certification is being performed under the NORSEE policy, allowing installation as a Minor alteration for Class I & II, non-pressurized aircraft (log book entry only). The FAA thinking is that it's not required equipment, and a failure of the equipment is minor in nature. Failure of a pitot or static connection is Major in a pressurized aircraft, so it's not eligible for that.

We are obviously just getting things started, but if you guys have ideas / features you would like to see, let us know!

Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -6. The time now is 12:13 AM.

The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.