Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!decvax!harpo!eagle!allegra!linus!genrad!wjh12!n44a!ima!inmet!ramsey From: ramsey@inmet.UUCP Newsgroups: net.physics Subject: Re: Orphaned Response - (nf) Message-ID: <86@inmet.UUCP> Date: Thu, 2-Jun-83 05:39:14 EDT Article-I.D.: inmet.86 Posted: Thu Jun 2 05:39:14 1983 Date-Received: Wed, 8-Jun-83 23:54:03 EDT Lines: 14 #R:sri-arpa:-156400:inmet:7600001:177600:584 inmet!ramsey Jun 1 13:44:00 1983 There are no aerodynamic factors which prevent helicopters from looping, only mechanical ones. Most helicopters are not designed to tolerate excessive negative g-forces (which could result from a sloppily executed loop). A mistake could result in the main rotor striking some other portion of the helicopter (like the tail boom or rotor) with clearly disasterous results. Some helicopters use what are referred to as 'rigid' rotor blades (the blades themselves are flexible, the hub is what is rigid). Some of these machines are quite capable of looping and rolling. Marc Ramsey