Abstract
This study aims to performance evaluation of ducted-fan multi copter. Ducted-fan multi copter has ducted-fans instead of non-covered rotors. Ducted-fan's rotor is protected by duct, so it can reduce risk of collision between human body and multi copter. We developed multi ducted-fan helicopter which has 4 ducted-fans. We call it Quad Ducted-fan Helicopter (QDH). In this paper, we developed new QDH that modified old QDH developed in last year. New QDH is reduced weight and extended body size. From flight experiments result about new and old QDH, difference of these flight characteristic was found. Flight performance of new QDH is better than old one. Furthermore we found that new QDH has almost same performance as standard 4 rotors helicopter.
