Hi Matthew, I'll see if I can find a reference. Seems like Sam Gisiger from Triadis (Altair/Vega fame) , who builds the Butterfly vario has cracked the nut many manufacturers have been trying to for years. He's a clever guy.
Cheers Mark On Tue, May 27, 2014 at 12:23 AM, Matthew Scutter <[email protected]>wrote: > >The algorithms we use are based on years (literally) of research and part > of a doctor thesis. > Was this published somewhere? It'd be interesting to read. > > On 26 May 2014 10:12, "Mark Fisher" <[email protected]> wrote: > >> A response from Butterfly's Marc Forderer via Swift Avionics. >> >> Dear Mike and Bernard >> >> Both of you wrote us the same forum post. We would prefer not getting >> involved into forums discussions. Her’s the (short-ish) answer. >> >> We are using AHRS computed data to determine airflow around the aircraft >> in realtime. We do this using our inertial platform inside our sensor unit. >> The algorithms we use are based on years (literally) of research and part >> of a doctor thesis. The horizontal component is wind, the vertical is what >> we call "vertical air mass“ (VAM). >> >> The advantage of this new computation method is that horizontal energy >> addition (in gusts) does not have influence on VAM readings. >> >> We have a mixing method that allows the user to blend in normal pressure >> sensor (TEK) based „Netto Vario“ signals into the VAM readings. If your >> installation is not perfect (= AHRS won’t work very accurately) or if you >> prefer not to use the new data but like your old fashioned netto better >> (with gust induced energy changes), then you can set it to 50% to mix it or >> even 0%. >> >> The standard setup is 100%, that means 0 conventional and 100% AHRS based >> data. We are very confident in this new technology and its fun to use. We >> don’t use just some Accel/Gyro data and mix them in some way to tell people >> its cool. Actually most users fly with 100%. >> >> Instantaneous wind makes a huge difference to your flying, even if not >> flying in mountainous regions where the advantages are obvious. The new >> wind indication helps you to locate thermals or convergences in flatland >> areas as it reacts to smallest local airflow/wind differences. >> >> We have come a long way bringing this technology to the market and making >> it available to many pilots in different aircraft. We have had quite some >> troubles in the beginning, but this is not unusual. If you want to bring >> new technologies to the market , you must know about the pain you will go >> through initially. >> >> We are thrilled by the possibilities the system offers and love flying >> with it, our customers do so, too. >> >> *Something you don’t have to write in the forum but its obvious:* Old >> technology vario manufacturers love to tell people that it does not help >> you flying or does not work. Now that its proven to work (ask people flying >> with it) they love to tell people how difficult it is to install it. I must >> admit that installation requires good care and some hours worth of time. >> But fly with one, you will see that its worth it. >> >> Cheers >> Marc >> >> >> >> -- >> Mark Fisher >> Managing Director >> Swift Performance Equipment >> Unit 2, 1472 Boundary Rd >> Wacol 4076 >> Australia >> Ph: +61 7 3879 3005 >> Fax: +61 7 36076277 >> www.spe.com.au >> >> >> >> >> >> _______________________________________________ >> Aus-soaring mailing list >> [email protected] >> To check or change subscription details, visit: >> http://lists.internode.on.net/mailman/listinfo/aus-soaring >> > > _______________________________________________ > Aus-soaring mailing list > [email protected] > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring > -- Mark Fisher Managing Director Swift Performance Equipment Unit 2, 1472 Boundary Rd Wacol 4076 Australia Ph: +61 7 3879 3005 Fax: +61 7 36076277 www.spe.com.au
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