Quote:
Originally Posted by jeff beckley
I have been looking at buying the TT EFIS with IV AP. I only have a miserly 430 non W. From what I have been told even with the new interface TT will not allow for a fully coupled approach. Only localizer. I would still have to hand fly the G/S. Too bad as I really want the ability to fly fully coupled.
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I wouldn't be so quick to form an opinion of that; here is why. LOC/ILS approaches are now outnumbered by GPS/GPSS approaches, and the former are being decomissioned while the latter are growing in number.
With the TT II VSG (no vertical coupling, but vertical speed select) the autopilot can approximate a perfect ILS. Just dial in the course as you intercept the LOC, and make small 1-2 degree corrections for wind as necessary. Once intercepting the glideslope, punch in 500fpm descent. If your trend is low, decrease by 100fpm - reverse that for trending high.
Is that a perfect solution? NO! However, I've tried that in really gusty wind conditions for fun (because the Digiflight will NOT fly the ILS coupled) and it works like a champ - smoother than I can fly it. According to field reports the Dynon does not <YET> have a vertical speed select considered "reliable in chop" (and when did you ever fly an approach in smooth soup?). So that leaves you with NO precision approach capability in the Dynon today (they are working on it, it will come).
Both vendors will improve their solutions - I am a supporter of BOTH Dynon and TT, and not promoting either. But neither does EXACTLY what you want just yet (check out the TT forum, I'm giving them grief about not creating an ARINC converter to make the Digiflight series capable of LOC/ILS). Too, if you choose later to upgrade your 430 to a "W," TT will upgrade the VSG to the VSGV for the difference in cost - giving you fully coupled precision GPS approaches.
Hope that muddies the water for you! Both have their plusses and minuses, and it is good to know EXACTLY what you are buying.