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Do you HAVE to wear a helmet in a DH Chipster Shaggy?
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Absolutly not. I got mine (a rather ugly David Clark thing, but it does of course fit my DC headset perfectly) because when flying aeros in the Yak 52 I needed something to stop my headset flying off my head. I could have chosen a 'soft' helmet, but thought I might as well avail myself of the extra protection from head injury a hard helmet provides - head injury is a common cause of fatality to pilots in otherwise survivable accidents.
So, having aquired the helmet for the Yak, it would be churlish not to use it in the more gently-aerobatted Chippy, where of course it still offers protection in the event of an accident. But I'm quite happy to fly the Chippy without a helmet.
SSD