ORIGINAL: rcprecision
Wally,
The CDI ignition system adds 4.5 ounces according to a recent article I read in the US AMA magazine. One would still need to consider whether to power it with the RX battery or stand alone battery.
Here's a link to a review....[link=http://www.patternflyer.com/troy/?p=89]YS CDI[/link]
A stand alone battery is recommended. A 2 cell Li-Ion is a good way to go. The extra 2-3 ounces is worth it and if you are fighting weight, shave the 3 ounces somewhere else
MattK