(Solved) BN-2 AP Engagement issue

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   Hi,
  I recently purchased the F1 BN-2 from the Just Flight store.
  I love this plane;  however when I engage the AP the plane pitches 
up abruptly and requires immediate action with the AP pitch control to
reduce attitude / vertical rate to a reasonable setting.  Can you 
suggest anything to correct this monkey business ?  Perhaps I should
engage the autopilot differently.  Am I missing something ?.  Goes 
anything need to be pre-set prior to AP engagement ?
Kind regards,
Ken Boardman

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Elsmoko Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: March-24-2006 Location: United States Points: 16	Topic: (Solved) BN-2 AP Engagement issue Posted: November-12-2022 at 5:27pm
	Hi, I recently purchased the F1 BN-2 from the Just Flight store. I love this plane; however when I engage the AP the plane pitches up abruptly and requires immediate action with the AP pitch control to reduce attitude / vertical rate to a reasonable setting. Can you suggest anything to correct this monkey business ? Perhaps I should engage the autopilot differently. Am I missing something ?. Goes anything need to be pre-set prior to AP engagement ? Kind regards, Ken Boardman

USN O6 Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: September-13-2009 Location: Sarasota, FL Points: 551	Posted: November-14-2022 at 7:29am
	Hi Ken, Do you have the aircraft trimmed (on pressure on the controls) when engaging the autopilot?
	Best, Jim

Elsmoko Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: March-24-2006 Location: United States Points: 16	Posted: November-14-2022 at 6:51pm
	Thank you for the reply Jim. Yes, I believe so. I use the FSX trim commands to trim the BN-2 for ~600fpm climb. Then when I engage the AP the rate of climb increases rapidly. I normally correct it before it reaches 2ooofpm by spinning the mouse wheel on the right hand rocker switch on the autopilot panel. I'm hoping perhaps I am missing something prior to AP engagement that will prevent this behaviour. Ken

USN O6 Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: September-13-2009 Location: Sarasota, FL Points: 551	Posted: November-14-2022 at 10:44pm
	If you are climbing at 600 FPM, engaging ATT mode should maintain that rate of climb. However, if your controls are not properly calibrated (and depending on what you have maybe an enlarged neutral zone for the vertical and horizontal axes) engaging ATT could very well cause the pitch up you are seeing.
	Best, Jim

Elsmoko Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: March-24-2006 Location: United States Points: 16	Posted: November-16-2022 at 11:14pm
	Hi Jim, It's all good now. I changed the sequence (button pushing order ~:) for engaging the AP. Thank you for your help with this. I sure do enjoy flying the SN-2. Best regards, Ken

USN O6 Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: September-13-2009 Location: Sarasota, FL Points: 551	Posted: November-18-2022 at 10:42am
	You are welcome. Good to hear you have it sorted, Ken!
	Best, Jim