The silent_runner is a small high performance model airship with a full do it your self documentation available at: http://www.silent-runner.net All parts are cheap and easy to assemble. Build your airship today and stop wasting battery power to low efficiency planes and quadrocopters, but start over with endless endurance and amazing grace. The whole project is undergoing finetuning and improvements, thus feedback is much appreciated. Silent runner i4 datasheet: length:.......... 2.1 m diameter:...... 0.5 m mass:........... 300 g motors:..........1x Brushless ESC:..............1x 10 A battery:.......... LiPo 2S 1000/500 mAh speed:............3 m/s endurance:.....90 min payload:.........40 gThe silent_runner consists of several parts and materials, including RC electronics and printed parts.Printed parts as listed here should be sliced and printed with care as they are optimized for low weight and thus have a filigree structure. You need: 1x front rod connector 1x motorring 1x motorring1 1x motorring2 5x rudergelenk 1x ruderhalter 1 1x ruderhalter 2 1x ruderhorn The full documentation including a full list of parts can be found under the following link: http://www.silent-runner.net/ This project is initiated and together with the greatly appreciated help of other helium heads developed by the Projekt Windreiter team: www.windreiter.de