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Most inverted radio-controlled (RC) model helicopters airborne simultaneously

Most inverted radio-controlled (RC) model helicopters airborne simultaneously
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Who
Radio Controlled Helicopter Association
Where
United Kingdom (Prestwold,Prestwold Hall airfield,)
When
08 September 2013

The most inverted RC model helicopters airborne simultaneously is 53 and was achieved by Radio Controlled Helicopter Association (UK), in Prestwold, Leicestershire, UK, on 8 September 2013.