I agree that an arming switch is absolutely necessary for for our large pattern planes.  However, my experience during the 2009 season with one of these isn't so great.  These switches are good for about 6 months to a year.  Power Poles arc when used on high voltate systems and due to the design of the contacts, the entire contact will eventually corrode.  I had one in my late Spot-On 120 (10S) electric conversion and after about 6 months, I noticed my idle-up behaving erratically.  After cleaning the contacts with a cut down emmory board, everything was fine again.

A home made arming switch made from Deand Ultra connectors or 4mm to 6mm bullet plugs will work as well without corroding over time.


Rob