---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Thu 11/24/16: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:32 PM - Re: Re: Dynon AHAHRS question (Bud Yerly) ________________________________ Message 1 _____________________________________ Time: 03:32:17 PM PST US From: Bud Yerly Subject: RE: Europa-List: Re: Dynon AHAHRS question Bob, I have built a number of panels and installed at least six types of Dynons from the original D-10 to D-180s, to a Skyview rewire.. Your panel layout is important for ease of maintenance, interference and security of the AHRS. >From the Skyview manual: Do not install near high current or magnetism. Avoid steel fasteners which may be magnetic. Also The ADAHRS installation location should also adhere to the following requirements: Avoid locations that are lower than the lowest point in the AOA/Pitot/Static system to reduce the chance of allowing moisture to enter the module. Avoid locations that are subject to severe vibration. Avoid locations that are subject to rapid changes in temperature. Avoid locations that are subject to extreme humidity. Leave ample working room for electrical and pneumatic connections. NON OF THESE WORKS IN AN AIRPLANE IN FLORIDA OR IN A SMALL AIRPLANE! Consider the following: Try to keep an AHARS close to the center axis of the airplane. In other words near the pitch/roll axis. Be sure to supply cooling air to the display unit. The new Skyview runs cooler due to a better processor but the unit still needs help keeping it cool. Symptom is it blanks out the screen. The Europa and most composite aircraft are a thermos bottle so you must mechanically get air past the unit. Cockpit air is good enough. I suck air from the pax footwell and blow it across the radios, the AHRS display computer, then out the top of the panel via more fans. Keep that stupid backup battery charged. It is all you have during the engine start power surge if hooked to the main bus. The Dynon Skyview in the Pipistel I am helping on works by turning on the avionics bus then turning it off (so the unit is on its backup power), then hit the start button. Heck of a thing. Plan well. Since pitot and static are necessary, consider the plumbing nightmare. If you have pitot static errors the avionics tech has to hook up to the AHARS independent of the round gauges. Plan for it, that way you never need it. Read the manual on a pitot/static check. You cannot change the pitot or static pressures while the unit is on. You have to shut it off between test points! Duh. As for the AHARS and Magnetometers: I have installed them under the pilots seat (Trigear). (Flight control movement is not a problem, but if you have electric fuel pumps keep the pump as far away as practical or about 3 feet.) I have installed them in the overhead (do not use the old David Clark massive magnetic headsets or your heading moves with your head). I have installed them under the radio stack in the panel and had no problems, but the AHARS has to have an aluminum box around it for EMP interference. I found out later. Don't worry about stationary metal objects near the magnetometer, it will work. It is the moving stuff like the mass balance arm. I have put them into the aft fuselage. I put it under the baggage bay and it worked fine. Make sure it is level, solidly mounted, and just in case adjustable in all three axis. Rubber isolation mounts are not to be used. I like to use brass screws into brass barrel nuts. If you are off just a bit, calibration takes care of those 1-2 degree errors. Test your installation up to full ground run-up before you finish the interior so you can make adjustments. Ground the AHARS/Magnetometer and Skyview to exactly the same ground plane. If you use the remote radio/transponder, ground them there too. Use quality connectors and learn to crimp well. Buy your sensitive mag compass (I use the SIRS type) and use it to check your desired installation for magnetism problems power on and off. Setup: Once installed, make sure you have ample time to do the setup. Plan at least an 8 hour day to get everything programmed. Then record all your settings in case it gets dumped. Call Dynon if you have a problem. Note: I build my panels so they can sit on a bench and be powered up and tested. Includes antenna and com. Test your pitot and static on the bench using proper equipment. Find and correct your leaks. A couple hundred dollars to an avionics shop is worth it. I have not had a problem with the engine running and any AHARS I've installed. I strongly suggest you install round gauge Altimeter and Airspeed and connect them to the Europa pitot tube for a backup. Pay attention if you want to use the Dynon pitot for your AOA as its location must be well below the wing and near the leading edge as in the setup or it's not worth setting up AOA. The Dynon pitot has a drain / vent hole so keep it clear. Do all the setups and updates per the manual, make sure each component is talking to the other and it will work. Issues: Pay attention to the tach. Dynons have tach oscillation problems. Pay attention as a 912 or 912S have too much voltage for the Skyview, and the 914 is a bit weak at the high end. I have had to put a pot in to find the right resistance to smooth and lower signal voltage to get it stable. On the 914, I had to install a tach generator. On one I had to put a shroud around the magnetometer due to antenna interference. Go figure only one antenna caused the jumpy heading. Buy a direct reading pressure gauge as the Dynon/Grand Rapids sensors don't always work as advertised. If you want exact readings, test, test, test. I confess I hate every piece of equipment in an aircraft, but if you spend the time, you will make it work the way you want it to (or settle for) and enjoy your experience. Folks love the Dynon Skyview for its "I don't even have to look out of the cockpit" neat stuff, but read the manuals, read the problem reports, and do the updates. Dynon tended to release hardware before the software caught up to the real world. Not so much anymore. Have a great time, you will enjoy it. Regards, Bud Yerly Custom Flight Creations, Inc. -----Original Message----- From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-server@matronics.com] On Behalf Of BobD Sent: Monday, November 21, 2016 10:53 AM Subject: Europa-List: Re: Dynon AHAHRS question I will be installing a Dynon Skyview System in my Europa in the near future, so have bumped this thread in the hope that since the original date, several more installations have taken place. I would be grateful for any advice or suggestions concerning the location and installation of the ADAHRS unit (and any of the other bits come to that), especially with photos if possible. TIA -------- Bob Dawson XS TG || 912 ULS || G-NHRJ Read this topic online here: http://forums.matronics.com/viewtopic.php?p=462856#462856 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/europa-list Browse Digests http://www.matronics.com/digest/europa-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.