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Piper PA28 Warrior II

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Re: Piper PA28 Warrior II

Postby Robertfm » Sun Jan 19, 2020 11:48 am

D-ECHO wrote in Sun Jan 19, 2020 7:57 am:The generic autopilot is now disabled in the repository, please check whether the problems persist.


I am sorry to say forbe they appear unresolved. I have tried to set a flight using RM ehpe to egpf the route shows up in the GPS as it should. The altitud in AP is 4500. I have set correct Baro, in G5 which sets AP Baro and set Altimeter baro. Set Nav 1 raio & HSI

I take off switch on AP and then activate arm and raise rate of ascent to 600fpm. I then switch to NAV which just stays below Rol see photo. This has happened twice.

Image


Edit: Forgot perhaps the most vital bit. When I switch on AP the plane ballons up and the speed plummets. I have now tried this on both versions of FG with same result.
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Re: Piper PA28 Warrior II

Postby Robertfm » Sun Jan 19, 2020 2:56 pm

It seems the generic AP is not just causing issues in this plane. I tried The DR400 Dauphine I couldn't get it to give me a GPS course, presumably because it had the 196 as well which does not link to the AP but seems to interfere with it. In the DA42 altitude hold didn't, in the Generic AP. Happy days.

Tried one of the other DR400 and whilst it set up it didn't activate although AP boxes were checked and than was still responding to Joystick movements.
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Re: Piper PA28 Warrior II

Postby WoodSTokk » Mon Jan 20, 2020 10:34 am

Robertfm wrote in Sun Jan 19, 2020 11:48 am:I am sorry to say forbe they appear unresolved. I have tried to set a flight using RM ehpe to egpf the route shows up in the GPS as it should. The altitud in AP is 4500. I have set correct Baro, in G5 which sets AP Baro and set Altimeter baro. Set Nav 1 raio & HSI

I take off switch on AP and then activate arm and raise rate of ascent to 600fpm. I then switch to NAV which just stays below Rol see photo. This has happened twice.

If you press NAV, the AP arm the NAV mode. The AP will change to NAV if there is a valid signal and the aircraft is inside the valid range.
On your screenshot i see the NAV flag on the HSI. This means the NAV radio does not receive a signal.
Maybe wrong frequency setup or the NAV transmitter is too far away or you are too low to receive the signal.
Anyway, no signal means the AP will stay in ROL mode until a valid signal will be received.
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Re: Piper PA28 Warrior II

Postby Robertfm » Mon Jan 20, 2020 11:12 am

If I may this is how I set up; Set Nav1, Set runway heading in HSI. I switch on Garmin 196. I use Route Manager to set course, which as can be seen registers in 196.
So after take off how do I get AP to follow course set in Route Manager. This is all very confusing in an earlier post it mentions setting Nav in AP
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Re: Piper PA28 Warrior II

Postby Robertfm » Mon Jan 20, 2020 12:27 pm

Really what is happening with this plane. It was easy to fly a month ago. Now even hand flying it wants to climb when my Joystick is at rest. No other plane does that. I am flying the warrior 1979 and no problems. This plane seems to constantly want to balloon. When I switched to AP instead of flying on the rol level it wants to climb even without VS but it bounces up and down. In short I can't fly it either manually or with AP. I know I don't under coding but what I do know is this plane isn't performing the way it did when I first started flying it.
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Re: Piper PA28 Warrior II

Postby Robertfm » Mon Jan 20, 2020 12:31 pm

D-ECHO wrote in Sun Jan 12, 2020 7:18 pm:I can't easily change the joystick config dialog, but with a little XML editing, you can assign a joystick button to it.

[EDIT] It is now available from utilities->Flashlight



Sorry I missed this edit until today. Thanks
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Re: Piper PA28 Warrior II

Postby WoodSTokk » Mon Jan 20, 2020 12:32 pm

That the AP follow the GPS course, set the 'AP Nav Source' switch to 'GPS' (right most position).
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Re: Piper PA28 Warrior II

Postby Robertfm » Mon Jan 20, 2020 12:44 pm

WoodSTokk wrote in Mon Jan 20, 2020 12:32 pm:That the AP follow the GPS course, set the 'AP Nav Source' switch to 'GPS' (right most position).


I realise I forgot that switsh, however asI said I can't stop the plane ballooning up. It now rotates at under 70 knots and I have to push tforward on he joystick to stop it doing a steep climb and it just does not settle down, when I release the Joystick to neutral position it climbs again. It is not the stick, it doesn't do that on any other plane. It never use to be this way.
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Re: Piper PA28 Warrior II

Postby WoodSTokk » Mon Jan 20, 2020 12:45 pm

Robertfm wrote in Mon Jan 20, 2020 12:27 pm:Really what is happening with this plane. It was easy to fly a month ago. Now even hand flying it wants to climb when my Joystick is at rest. No other plane does that. I am flying the warrior 1979 and no problems. This plane seems to constantly want to balloon. When I switched to AP instead of flying on the rol level it wants to climb even without VS but it bounces up and down. In short I can't fly it either manually or with AP. I know I don't under coding but what I do know is this plane isn't performing the way it did when I first started flying it.


This plane is under developement. Its normal that with every update the behavior changes a little bit.
How the aircraft react and fly in air is a matter of the FDM. I have not changed anything inside the FDM because i know nothing about JSBsim.
But i do know that improving the FDM is a process that need a long time. I have improved a YAsim FDM and needed more than 6 months.

IMHO a developement of a aircraft need years. The PA28 has a FDM (not close to reality, but its flyable).
Now to improve the airplane further, there are other things to do. A perfect airplane need a really nice model, hi-res textures, shaders, clean sounds (also background noise and environment noise), correct animations, scripts to simulate all functions and so on.
A airplane is not finished in some days.
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Re: Piper PA28 Warrior II

Postby WoodSTokk » Mon Jan 20, 2020 12:50 pm

Robertfm wrote in Mon Jan 20, 2020 12:44 pm:…, however asI said I can't stop the plane ballooning up. It now rotates at under 70 knots and I have to push tforward on he joystick to stop it doing a steep climb and it just does not settle down, when I release the Joystick to neutral position it climbs again. It is not the stick, it doesn't do that on any other plane. It never use to be this way.


I also recognised this behavior. The aircraft becomes airborne at around 65 - 70 kts.
There is everithing wrong with the FDM. I set the elevator trim to 50% (or more) nose down.
Also the KAP 140 (if engaged) shows allways 'PT DOWN'. The AP can't trim, so the pilot should trim.
This annunciator stops if the elevator trim is at 50% (or more) down.
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Re: Piper PA28 Warrior II

Postby Robertfm » Mon Jan 20, 2020 1:18 pm

I have used the down trim but it does little. I don't understand the annunciator comment. What annunciator?
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Re: Piper PA28 Warrior II

Postby Ysop » Mon Jan 20, 2020 1:26 pm

Just quick :
There seems to be a lift problem, also visible in cruise attitude and glide ratio.
Currently under investigation.
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Re: Piper PA28 Warrior II

Postby Robertfm » Mon Jan 20, 2020 1:27 pm

So it isn't my imagination. Nice to know
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Re: Piper PA28 Warrior II

Postby WoodSTokk » Mon Jan 20, 2020 1:56 pm

Robertfm wrote in Mon Jan 20, 2020 1:18 pm:What annunciator?

If the KAP 140 is engaged, left of the digits can flash 'PT' (Pitch Trim) with a arrow down or arrow up.
This show the pilot that he/she should trim down or up, until the annunciator stops blinking.

Why doesnt the AP trim by itself?
Because the AP has no motor to trim it. The AP has only servos to control ailerons and elevator.

How does the AP recognice that the airplane should be trimmed?
Because a servo report allways the actual position and if the aircraft is correctly trimmed, the servo should report the position around 0.
If the servo is some seconds continously to far away from 0, the AP annunciate the pilot to trim.

PS: the PA28 have a trim motor and a switch to turn it on.
But this is actually only used by the S-TEC 55X. I will look into the code and make it also usable for the KAP 140.
Last edited by WoodSTokk on Mon Jan 20, 2020 2:00 pm, edited 1 time in total.
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Re: Piper PA28 Warrior II

Postby WoodSTokk » Mon Jan 20, 2020 1:59 pm

Knüppelrührer wrote in Mon Jan 20, 2020 1:26 pm:Just quick :
There seems to be a lift problem, also visible in cruise attitude and glide ratio.
Currently under investigation.


Nice, Thanks!
I also recognised that in level flight the PA28 flys nose down.
If you look at the HUD, you will see allways 3° nose down in level flight.
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