My friend Leif and I had to abuse our two new JW60´s... The bungee system used was ment for up to 4m F3J models. We reinforced the complete length of the JW60´s with kevlar and placed the launch hook less than 5cm from the nose for a nice flat launch. Theese flights was a part of setting the correct trim and rate for the rudders... but we are hooked ;) The telemetry system (HoTT from Graupner) reported a launchspeed of 122km/h, but the bungee cord has a bit more to deliver :D. Next sted is to DS theese models in a couple of weeks!
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