One of the great things about backyard flyers is how easily they can be modified and hopped up to suit your own taste. Most ARFs and kits are now well designed and require little guesswork when you simply follow the directions. But when it comes to adding more power to expand the flight envelope, you have to learn a few things to keep your new equipment happy. Let's look at how I hopped up the power system of my Carl Goldberg Products Tiger 400 ARF.
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