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|Gyroscopic forces can be surprisingly high (click small images to enlarge and get more information).||Motors and ESCs must be well cooled (click small images to enlarge and get more information).|
It is important that the ESC is rated for at least a little more than the current being drawn by the motor. A generously rated ESC will run cooler, and will provide more 'headroom' for any propeller changes.
Like the motor, the ESC must also be adequately cooled. This is extremely important if the RC system is fed by a BEC which is part of the ESC - if the ESC overheats, the BEC may no longer work, causing a loss of control. It is not possible to over cool an ESC.
The ESC should not be free to flap about; make sure it’s restrained in the model and that its associated flight battery and RC system connectors cannot become undone in flight.
The battery must be properly restrained - you really don't want it falling out of the model in flight, endangering people below. The battery must not be able to move inside the model either, otherwise it may shift in flight causing a disastrous change in the CG of the model. This would render the model un flyable.
The battery should be adequately cooled. High power installations will generate much more heat than lower powered ones. Don't over cool or under cool the battery - LiPo batteries must not be allowed to overheat, and work best when slightly warm.
|The battery must be firmly held within the model. The battery of this Interceptor by Chris Golds is retained by two straps.||Props should be balanced - any vibration may lead to equipment failure.|
The propeller should not be overlooked. It's important to make sure the prop is balanced, otherwise it will create vibration which can cause a high rate of wear on the airframe and electronics, which can potentially lead to equipment failures. Also, any energy used to produce vibration won't be available for propelling the model, so a balanced prop will bring a performance benefit too. Spinners may also need balancing.
Motor failures & multi-motor models
Motor failures with multi motor models are potentially much more serious than for single motor models, as an asymmetric power condition can quickly cause a pilot to lose control.
The damaged model in the heading picture was a Lancaster, which unfortunately suffered a failed gearbox, leading to an asymmetric power condition. Moments after the failure, the model entered a spin and crashed. At least the builder had not spent time painting the model! Happily, the airplane was rebuilt and finished to a high standard, rewarding its builder with satisfying flights.
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