Prague, Czech Republic
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I don´t know anyone having an AC-3X specificaly on a Protos but in Germany a lot of guys use it on other 500 size Helis. If you speak at least a little German, look here:
you have a search function in this forum, so just enter "AC-3X"
Further the manufacturer is running an own forum just for the AC-3X and you can post there in English as well:http://www.acrobat-forum.com/viewforum.php?f=19
Im am sure you will get satisfactory answers very fast