I'm using Roberts Bonanza mod and the Working Title G1000 mod, both latest versions.

When taking off and climbing out at 1000ft /min I pre-set the autopilot to VS at +1000 vertical climb and select autopilot, but selecting the A/P seems to deselect VS mode and the aircraft aggressively levels off.

What is the correct procedure to achieve a smooth transition from a manually flown 1000ft/min climb to VS in autopilot mode ?

2 hours ago, GAJ52 said:

What is the correct procedure to achieve a smooth transition from a manually flown 1000ft/min climb to VS in autopilot mode ?

I use FLC instead of VS to climb and VS only to descend and have no issue.

Using FLC is safer in real world operations because the plane is maintaining speed via pitch and in VS it’s maintaining climb via pitch but will allow speed to decrease and if not watched it could lead to a stall.

I don’t know if it’s simulated but the wing leveling almost seems like an envelope protection to avoid a stall.

Thats not it probably, but that appears to be the behavior you’re describing.

I know this doesn’t answer whether that’s a bug or not, but using real world best practices it’s not an issue.

I hope this helps.

Maybe someone with more knowledge will help.

Edited November 19, 20205 yr by Cmcollazo71

This is a well known issue as the incorrectly modeled Asobo AP opens the VS "window" at 0FPM instead of the currently experienced rate... this is a big oversight and one that I hope will be remedied soon as it severely detracts from the experience.

He is currently working on the DA62, and if there are improvements made there, I'm fairly certain they will trickle back to the TNB.  If anyone can solve this vexing problem it's Robert.

Fingers x'ed!

C

1 hour ago, cavaricooper said:

This is a well known issue as the incorrectly modeled Asobo AP opens the VS "window" at 0FPM instead of the currently experienced rate

So it is a bug, but my initial response still stands that if you use FLC to climb is a non-issue.

I haven’t noticed that behavior in a descent if you dial in the new altitude first, hit VS and then dial in rate of descent.

4 minutes ago, Cmcollazo71 said:

So it is a bug, but my initial response still stands that if you use FLC to climb is a non-issue.

I haven’t noticed that behavior in a descent if you dial in the new altitude first, hit VS and then dial in rate of descent.

You are right. It is best to use Flight Level Change when going up, as that prevents slowing down and stalling if you forget to monitor the Vertical Speed. And VS is ok for going down as you can set an exact descent rate.

All the same, VS mode should not start at the last chosen setting but roughly at the attitude you were established on before you pressed VS.

One way around this (though not recommended in real world flying) is to very briefly disengage autopilot, then set the VS to the desired climb or descent rate then re-engage the autopilot. It is far from ideal but it does overcome the issue/bug.

+1   I repeatedly experience the same. Annoying

1 hour ago, robert young said:

You are right. It is best to use Flight Level Change when going up, as that prevents slowing down and stalling if you forget to monitor the Vertical Speed. And VS is ok for going down as you can set an exact descent rate.

 

What he said.  And FLC and VS are both used this way in real flight.  Many videos out there on it.  That said, as others have mentioned, VS is not correctly modeled on how it reacts when first activated with the VS key.

Many thanks for your comments and advice.

I didn't notice that FLC button on the autopilot panel, controlling the climb based on speed is a much better option than VS.

4 hours ago, GAJ52 said:

When taking off and climbing out at 1000ft /min I pre-set the autopilot to VS at +1000 vertical climb and select autopilot, but selecting the A/P seems to deselect VS mode and the aircraft aggressively levels off.

This should actually work, if you have a target altitude set, VS and VS rate selected in FD mode.  Then when engaging the autopilot, the selected VS rate should remain.

If you have AP engaged already, then select VS, it (incorrectly) resets the VS rate to zero.

26 minutes ago, Bert Pieke said:

This should actually work, if you have a target altitude set, VS and VS rate selected in FD mode.  Then when engaging the autopilot, the selected VS rate should remain.

If you have AP engaged already, then select VS, it (incorrectly) resets the VS rate to zero.

IT does work, If I want to use VS, After I line up I set heading in the AP and VS to 1000-1400, take of, AP On, all is good. But like Bert says you also need to have set you ALT. Never had a problem with this as long as you have entered you ALT before hand. If you don't then that's were your going wrong and see what your seeing. 

FLC is also fine to use. Also the one to use on climb.

Edited November 19, 20205 yr by Nyxx

Nyxx that's how it works for me too. Always set Alt to desired Alt first, then set VS to desired and engage AP. I'm doing it on the Logitech Multipanel, but it has always worked for me doing that.