Vision 385 Pitch issue

[LachlanH]

Hi all,
I purchased a 2nd hand Vizion 385 to replace to Digiflight II VG in my RV7.
I have fitted the AP, but I is nowhere near as good as the Digi, particularly in pitch response.
I am suspecting a possible static P problem as the sync alt was set on the ground, then was 300' out at 2000'... Pitot and static unchanged from the Digiflight.
Any thoughts?
Cheers

 

[moosepileit]

Do you have an alternate static switch valve in your plane?

My pitot-static is IFR to 18K'. In flight, at cruise, Autopilot holding altitude, if I switch to alternate static the plane dips 30' in reaction, just about instanly. Close the alternate switch, zips right back up.

If yours does not act similarly, suspect a bad fitting, seal or crack. Not sure which pitch sensitivity is set, but it is a low value, 2, I think.

 

[uk_figs]

Recommendation for pitch sensitivity for the RV-7 is 2 as noted, it is tagged as Vrt Activity in the setup. Look for "Vizion-380-385-Installation-Manual.PDF". I have a copy if you need it.
I also recall a problem with the Pitot Static connections on the back cracking way back, so that might be worth a check.
Figs

 

[gmkonrad]

Make sure the baro setting is correct on the ground, this will affect the A/P altitude.