As a very general rule of thumb the CG will be about one-quarter to one-third of the wing chord (width) back from the leading edge of the wing. So, then, the first thing you need to do is identify the correct Centre of Gravity position according to the plan or manual. Tapered and delta wing shapes need to be treated differently, but it's (hopefully) unlikely that your first rc plane will have anything other than a parallel wing.
High-wing planes are the easiest to balance and if it's your first plane then this is likely to be the case, since you should have bought a high wing trainer to learn on! (Learn about beginner rc planes.).Īlso, a high-wing trainer will more than likely have a parallel wing chord, which the following method applies to.
This is especially true for tail-heavy planes.Īt worst, the plane will crash within seconds of getting airborne, ruining your day! Methods of Balancing RC Airplanes This is not unusual, and just means the CG can be moved forwards or backwards slightly without having an adverse affect on the plane's flight characteristics.īalancing a radio control plane correctly about its Centre of Gravity is so important because a very badly balanced plane will, at best, be hard to control. Incidentally some rc airplane manufacturers specify a range that the Centre of Gravity can fall into, rather than a single point. Typically it will be given in terms of distance back from either the leading edge of the wing or from the nose.
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If you've built from a kit, the CG should be clearly marked on the plan but if you've bought an ARF or RTF plane then the instruction manual should give you the CG position. The CG point is determined during the design stage of the plane and is typically shown on a plan as a disc split in to four quadrants, as shown to the right. Technically this is called longitudinal balance.
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