NicoN Posted October 5 Report Posted October 5 A colleague said, that the GFC500 provides vertical guidance by using the servo not direct on the elevator but using the elevator trim. Therefore he has the idea that you need 2 Servos to have lateral guidance AND vertical guidance including elevator (auto)trim. I thought you need 3 Quote
ArtVandelay Posted October 5 Report Posted October 5 Hmmmm, making it complicated.The trim servo will allow the elevator servo to work with less resistance.3 servos, without the trim servo you would need to adjust the trim manually, but I don’t know anyone who just installed 2 servos. Quote
Pinecone Posted October 5 Report Posted October 5 If you have only two servos, the autopilot does not adjust the trim, you need to do that manually. There IS a pitch servo the drives the elevator directly in all installs. Quote
kortopates Posted October 5 Report Posted October 5 Many C172’s have only the two servo install. It’s very annoying since anytime you either change airspeed/power or want to change altitude the AP starts annunciating TRIM UP or TRIM DOWN. You become the third servo and you’ll be called on a lot more than you would likely expect. Okay for a trainer that spends most its time in the pattern but quite annoying for an owner flown xctry airplane. Sent from my iPhone using Tapatalk Quote
NicoN Posted October 6 Author Report Posted October 6 Right, we also have electrical trim but not auto-trim. So, the answer is: we need THREE servos Next question: We have 2 GI275 installed; do we ONLY need Servos (3) and a mode controller, or do we need another G5 or GI275? Quote
Stanton R Posted October 9 Report Posted October 9 If the GI 275 are installed as an ADI and HSI and are mod 1 then you will need the mode controller, servos and install kits. Quote
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