PUBLICATION of a photo of a modeller using ear defenders while launching a Free Flight power model, in our May issue, drew strong reaction from a senior RAF officer suggesting that all similar models be silenced to ensure continued use of RAF venues. The concern for noise generated by models and the good name of the hobby are sentiments we share. However to put the record straight, there is more than one way of minimising noise nuisance. Most R/C modellers, for example, use effective exhaust mufflers typically reducing noise output to 82dB - or they choose Thermal Soaring gliders for true silent flight. Free Flighters on the other hand, limit the engine run to 7 seconds (or 10 seconds in some cases) and records prove that such short engine runs, even for unsilenced motors (current rules ban their use) produce far less nuisance than even fully silenced models flying for longer periods. Ear protection is a matter of choice for the individual, however the majority of noise generated actually comes from model vibration and airframe resonance, air intake and propeller noise, so even exhaust mufflers can only be partially effective. Considering that such F/F power models are usually only flown on remote locations, we can see no need for mandatory silencing at this time with the associated increase in weight and power than would be involved.