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I have heard that you don't want to use the standard aircraft ignition switch with the R,L, Both option on the Rotax 912S. I've been told that you want to set it up where you have the ignitions modules powered / grounded by separate toggle switches. My kit came with the the R, L Both ignition. Could someone provide more information on this subject?

Thank you

Vance

  • Re: How to wire the ignition switch??

    by » 10 months ago


    this is what I found

    Incorrect ignition switch. Many S-LSA come from the factory with the familiar “off-left-right-both-start” ignition switches that we’ve seen for years on Continental- and Lycoming-powered aircraft. The problem is that these switches are not designed to handle the AC voltage used in the Rotax ignition system. This can cause various anomalies in the Capacitor Discharge Ignition (CDI) system, including erratic ignition and hard starting. These switches should be replaced with heavy-duty toggle-type switches rated for AC voltage.

    coming from here.... https://midwestflyer.com/?p=3412

    also, having the ignition switches a part make it possible to 'crank' the engine with the ignitions OFF,  

    which is not possible with the " R-L-Both" switch

     


  • Re: How to wire the ignition switch??

    by » 10 months ago


    Here’s a way to wire your toggle switch.


    Thank you said by: Roy Vance Simons

  • Re: How to wire the ignition switch??

    by » 10 months ago


    You can also use a S700-2-50 switch, the momentary function is used to start the engine. It’s my setup.

     

    Daniel Pelletier


  • Re: How to wire the ignition switch??

    by » 10 months ago


    Vance,

    Up to you, but the keyed switch you have will work.  The keyed switch provides simple aircraft safety and security that two toggle switches can’t. This topic surfaced at least ten years ago after ACS had to issue a Service Bulletin for its keyed 510 switches.Yes, the current Rotax installation manual does call for two switches with minimum 250 Volt and 0.5 Amp rating requirements. Yet when I ordered my Rotax 912 engine kit from Zenith last Spring, and Zenith has been selling Rotax kits for their aircraft for many years, my kit came with the ACS 510 keyed switch as updated per the SB many years ago. If you watch Roger at Zenith flying their demo aircraft with Rotax engines over the years you will still see the ACS keyed ignition installed, and they’ve updated and modified and tested many systems on their demo aircraft. I installed it and began flying last year with no problems so far. 


    Thank you said by: Roy Vance Simons

  • Re: How to wire the ignition switch??

    by » 9 months ago


    I have also heard this discussion for many years and can only say that it is definitely NOT conclusive. I ordered my Rotax 912uls from Kitfox in 2011 and it came with the ACS keyed switch which I installed. I have been flying now for over 6 years and 800 hours with this same ignition switch with no problems whatsoever, as have many other Kitfox owners. I agree, you can't crank the engine with ignition off, but I have found no reason to do this in 800 hours.


    Thank you said by: Roy Vance Simons

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