We are installing a Dynon autopilot system on a Tecnam's Eaglet. It exhibits an unstable heading control in HDG mode. It only seems to be corrected by setting a very high roll sensitivity (20 to 25) and a turn rate limit of 1,5 deg/s or less but, when ALT mode is also engaged, random heading wandering (more than +-10 deg, sometimes stable, sometimes gradually increasing) appears. Also when performing AP-commanded 90 deg turns, it always overshot. This can be corrected by setting turn rate limit to 0 and bank limit to >=20 deg, but then random heading wandering and/or unstable behavior occurs.
Installed system:
- An EFIS-D100 unit
- An EMS-D120 unit
- A HS34 unit
- An AP74 unit
- Two SV32 servos
- Firmware 5.4 (upgraded from a 4.x version in D100, D120 and HS34)
Installed system:
- An EFIS-D100 unit
- An EMS-D120 unit
- A HS34 unit
- An AP74 unit
- Two SV32 servos
- Firmware 5.4 (upgraded from a 4.x version in D100, D120 and HS34)