Problem with Mercury SRS gyro with 18MZ

  • Hallo alle


    Nach über fünfzig Jahren 'konventionellem' Modellflug bin ich eben daran meinen ersten Jet fertig zu stellen.

    Vor einigen Wochen habe ich mir eine 'Powerbox Mercury' gegönnt und wurde zufälligerweise im RCN-Forum auf die hier besprochenen Probleme

    aufmerksam gemacht.

    Ich hatte die Mercury sowohl wegen des integrierten Kreisels besonders jedoch wegen der Empfänger-Redundanz gekauft.

    Angeschlossen werden zwei Futaba R7008 SB-Empfänger.

    Nach all dem gelesenen bin ich nun total verunsichert ob ich die Mercury überhaupt einbauen soll: Auch an unserer Vereins-Jahresversammlung

    war die Mercury d a s Thema. Die einen berichten, man solle nur einen Empfänger nutzen, andere sagen, man sollte den Gyro nicht einschalten.

    Wieder andere berichten, die 'Schallschutzhaube' würde Abhilfe bringen...

    M.E. kann's das doch nicht sein! Soweit ich gesehen habe, gehen die ersten Berichte von Fehlfunktionen zurück auf Oktober 2016.

    Deshalb hier die konkrete Frage:

    Sind die Gründe für die Mercury/ Futaba Störungen mittlerweile bekannt, bzw. ist das Problem nun durch irgendwelche Massnahmen (...oder Updates) zu beheben

    oder bereits behoben worden?


    Grüsse, Marvin

  • Hallo,


    Mir ist auch schon zugetragen worden dass da irgendwelche Gerüchte im Umlauf sind: ALLES Quatsch!

    Bis auf die bekannten Schallprobleme gibt es mit der Mercury keine Probleme. Wir haben von dieser Weiche einige verkauft, das Gerät arbeitet äußerst unauffällig.

    Warum man nur mit einem Empfänger fliegen soll erschließt sich mir nicht- wo ist da die Logik? Die SRS Technik wird seit Jahren nahezu unverändert eingesetzt. Zu Problemen der älteren R7008 Empfänger kann man bei uns in der FAQ was nachlesen.


    Bugfixes und Updates behandeln wir sehr offen und für jedermann zugänglich: Mercury SRS



    Zu den Schallproblemen des Kreisels gibts zu sagen: alle am Markt befindlichen Kreisel haben diese Probleme mehr oder weniger- die Sensoren arbeiten alle mit der gleichen Technik. Unsere iGyros und Royals sind dagegen sehr imun, die ersten Mercury mit dem 6-Achsen Sensor sind empfindlicher, weswegen jetzt wieder der gleiche 3-Achsen Sensor wie bei den anderen PowerBox Gyros eingebaut wird. Das Problem tritt nicht überall auf und hängt stark von der Einbausituation ab. Sollten während das Triebwerk läuft Probleme auftauchen, kann man das in dem meisten Fällen mit der Schallschutzhaben (im Übrigen von uns kostenlos) beheben. Meistens aber gar nicht nötig.

  • Hallo Richard

    Besten Dank für die ausführliche Stellungnahme!

    Dann bin ich ja beruhigt und werde die Mercury gemäss den Empfehlungen einbauen.

    Beste Grüsse,

    Marvin


    NB Könnte ich eine Dämmhaube erhalten? Vergüte gerne die Versandkosten.

  • Hi there,


    I have the mercury and am ready to test fly. i am a little concerned now as this is an expensive jet. I will run the turbine and watch the surfaces but how do i know if the powerbox is version 1 or 2 please?

    Also my mercury does not show either receiver is OK it just has -- but control is ok from both receivers. i have set the batteries to Li-ion also but the indicator shows empty when there is still 3/4 of the pack capacity left. Why would this be?


    Cheers

  • Hello,


    the Version 2 has a yellow or red dot on the bottom side. But don´t worry: also version 1 is working in most cases! Just in some model setups turbine close to the PowerBox you may have problems.

    Also I need to say that most gyros on the market are sensitive to turbine noise - all are using the same sensor technology!

  • Hello


    I bought 2 mercury boxes (Aerobertics). I'll use on Xcalibur jets : very close to turbine.

    Could you please send me 2 "hulls"?

    How to manage it?


    Second question : I'll link 4 (2 for each box) receivers 7006SB FUTABA : is it requested to adjust receivers and the boxes (like for 7008 and 6308 SB?)


    Thanks


    Olivier

  • I use R7006 receivers with Mercury and iGyro SRS. Default receiver mode has SBUS on channel 5 position. Be careful this default has SBUS2 on channel position 6, and the connectors go in 'upside down' compared to other Futaba 7 series receivers.

  • I have three Mercury SRS devices with GPS. Two of my three jets have experienced uncommanded rolls very similar to what has been described in this thread. One of my jets rolled over on short final and was destroyed, the other incidents happened higher up and I was able to recover without crashing. Initially, I thought I stalled the jet that crashed, but after reviewing this thread and watching the video of the crash I'm leaning more towards the gyro being the culprit (happy to post the video if anyone is interested) None of my three Mercury devices have a red or yellow dot on the bottom so I'm assuming they are all the older model (even though I have purchased them new all in the past 18 months).


    After losing one jet, and experiencing similar uncommanded rolls on the other two I have now lost confidence in these Mercury SRS gyro units and will no longer fly with the Mercury in gyro mode. I cannot express how disappointed I am after spending close to $1500 on these three gyros. If Powerbox is as confident as they say they are about the safety of these units I would invite them to buy my three back and fly them in their jets. In the meantime, I have three $489 paper weights for sale.

  • Hello,


    I´m sorry to hear that, but we sold hundreds of this units meanwhile - because of one or two issues worldwide without really clarification of the reason you are sure that you have two units at the same time which makes problems? Are you serious?

    If you have two times the exactly same problem I would have an eye on my radio and not look for problems in two different planes!

    I can offer you to exchange the units in new versions if you made observtions on turbine noise problems (jitter at different turbine RPM), but don´t blame us for crashes without prooving the reason.

  • Hello,


    I´m sorry to hear that, but we sold hundreds of this units meanwhile - because of one or two issues worldwide without really clarification of the reason you are sure that you have two units at the same time which makes problems? Are you serious?

    If you have two times the exactly same problem I would have an eye on my radio and not look for problems in two different planes!

    I can offer you to exchange the units in new versions if you made observtions on turbine noise problems (jitter at different turbine RPM), but don´t blame us for crashes without prooving the reason.

    Richard,

    Please allow me to apologize for my rant, I acknowledge it was not constructive and it was not fair to subject you to my frustration in that manner. In the spirit of keeping things constructive I will do some ground runups this weekend to see if there is any jitter at different turbine RPMs and will let you know how that goes.


    Regarding my aircraft that crashed, here is a video of the last 18 seconds of the flight:

    If you watch the video frame-by-frame you will see that the aircraft has plenty of energy as I turn base and onto final approach, as I'm turning onto final the aircraft suddenly, and rapidly, rolls to the right. Again, if you watch it frame-by-frame you will see that the left wing actually climbs (even though I'm turning left onto final) and the whole airframe actually climbs slightly during the roll right, it seems to me that this could only have occurred if the left aileron was deflected downward. Since I was turning left when the right-roll occurred it seems to me that the there was some kind of control input causing the left aileron to deflect downward (causing the left wing to climb). None of this means that the gyro caused the input resulting in the roll to the right, as you stated above, it could have also been caused by the radio. However, the gyro cannot not be ruled out as a suspect either.

    My goal here is not to point the finger or assign blame. My goal here is simply to prevent another accident, which are expensive, but more importantly could hurt someone. I encourage everyone to review the video and make an assessment of what went wrong, then let's have a constructive discussion about the possibilities. If the general consensus is that I stalled, or that the radio caused the problem then I'll leave it at that. In the meantime, I appreciate your time and effort responding to these concerns.


    Best regards,


    Tom

  • Hello,

    what definitely can be said is: yes- it was a controlled roll, not a stall. I assume the plane was totally destroyed, but are there rest parts of the aileron linkage? Do the servos still work?

    How many times has this plane flown? I ask that because if this would have been a turbine noise problem, it would not come after many flights... another point which stands against the turbine noise problem is that the turbine was almost in idle, the problem comes with the frequency of course but also from noise level which is naturally much more in higher RPMs.

    Just some ideas...