There seems to be a problem withe new Piper Archer III



  • Would be great if you could add the extra horsepower. Just bought the plane yesterday after comparing to another Cherokee - really like how you folks do planes now.

    To add some extra detail as you play with the parameters... The plane is really dogging it at altitudes above 8k. 8k is a good cruise altitude for that plane and it can barely hold 80 kts clean and leaned to max RPM (with wheel pants). Takeoff acceleration is strangely OK; it just can't climb even lightly loaded below ISA. The service ceiling for the Archer is 13k, and I am getting climb rates of 100 fpm max at 8-9k (below ISA) - which are service ceiling climb rates.

    FWIW I have time in Warriors, Archers and Arrows. Did my checkride in an Archer after training the whole time in a Warrior. I passed, but that was a bad idea as I did not think 20 extra horses would do much - it did. Sadly my flight school let me do it since it was the only plane available. Point is, subtle changes can make a big difference. The 200 HP Arrow is a rocket ship comparatively.

    Thx for your efforts.

    Rick



  • I believe I may have found a good temporary fix for the Archer III until Just Flight releases an update:
    First, open the aircraft.cfg for the JF Archer III.
    Under [flight_tuning], change the value of "parasite_drag_scalar" from 1.0 to 0.5.
    Under [piston_engine], change the value of "max_rpm_mechanical_efficiency_scalar" from 1.0 to 0.9 (ignore the fact that is says "Always 1.0).
    Finally, also under [piston_engine], change the value of "bestpowerspecificfuelconsumption" from 0.52 to 0.8.

    These changes should give you more accurate cruise performance in terms of True Airspeed and Fuel Flow, and also help with the issue of the prop overspeeding.

    Hope this helps,
    Alec



  • @alecd Thanks for this!!



  • @alecd said in There seems to be a problem withe new Piper Archer III:

    I believe I may have found a good temporary fix for the Archer III until Just Flight releases an update:
    First, open the aircraft.cfg for the JF Archer III.
    Under [flight_tuning], change the value of "parasite_drag_scalar" from 1.0 to 0.5.
    Under [piston_engine], change the value of "max_rpm_mechanical_efficiency_scalar" from 1.0 to 0.9 (ignore the fact that is says "Always 1.0).
    Finally, also under [piston_engine], change the value of "bestpowerspecificfuelconsumption" from 0.52 to 0.8.

    These changes should give you more accurate cruise performance in terms of True Airspeed and Fuel Flow, and also help with the issue of the prop overspeeding.

    Hope this helps,
    Alec

    It is very close - thanks for this - JF says that if a developer responded to the forum then it is in a list of fixes for the next patch - no timetable.

    But this solves the problem!

    Rick



  • Actually it helps a bit, but I still have the prop overspeed (And autopilot issues). I am adding this comment to make sure that JF don’t mistakenly think the plane works. The FDE needs the update. I have been waiting on a ticket response for months. New planes keep coming out...



  • @SR22Driver said in There seems to be a problem withe new Piper Archer III:

    Actually it helps a bit, but I still have the prop overspeed (And autopilot issues). I am adding this comment to make sure that JF don’t mistakenly think the plane works. The FDE needs the update. I have been waiting on a ticket response for months. New planes keep coming out...

    Just heard back that a new update is out with FDE fixes. Thanks for following through Just Flight!



  • @Delta558 - So at lt last there's a patch! Still not performing anythink like it should! Takes off like a rocket, EGT gauge still not fixed, still has a tendency for prop over speed and for a simple model is very graphics intensive which really pulls down the FPS. Still disappointed!



  • @Wiggi001 To put it very simply, if you are getting the prop to overspeed in any situation other than a sudden dive at around 140kts then you are not flying the updated files. Not sure where the problem lies with that and until there's been some digging I can't suggest much sorry.



  • I see there is no further update to this very flawed product.
    Take off accelaration on the ground still far to quick.
    Climb performance is more akin to a polaris missile and cruise speed is just wrong.

    Product now deleted and I will not be purchasing from Just Flight again.

    Wiggi001


  • JF Staff

    @Wiggi001 That's your opinion and no problem with that. It's been checked here again and we can't reproduce the issues using the latest build (from Nov 19), the FDE seems fine.

    But if it doesn't work as you'd wish and that will mean you won't be using the aircraft then please contact the support team who will be happy to issue you with a refund. This Archer has been very well received since release and has become a favourite add-on for many users. However we'd not want anyone sat on an aircraft they can't use so please feel free to do as I suggest above and claim your refund.