But the requirement that the engines be matched is much reduced; control is now coming from the jet vanes and not differential throttling. As a result, any imbalance in the engines can be handled by the guidance system using the jet vanes. The engines could be different by large percentages and the system would still work.
Roger -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Henry Spencer Sent: Monday, June 07, 2004 6:30 PM To: ERPS Subject: Re: Multiple engines (was RE: [ERPS] Liquox) On Mon, 7 Jun 2004 [EMAIL PROTECTED] wrote: > ...Better still would be to keep both of the easy problems and > get rid of the hard problems... Unfortunately, since both of your ideas involve adding engines, they both move John back to a hard engine problem that he's trying to avoid: making multiple engines with closely-matched behavior, to avoid transient thrust imbalances, especially during startup. > 2) Go back to your original four-engine configuration, with each engine > having one jet vane, oriented radially. You can put all the servos in the > centre facing outward. This should give you greater control, especially for > roll. Roll control is generally a very minor issue, especially in a single-engine vehicle that has no reason to have significant stray torques on that axis. Henry Spencer [EMAIL PROTECTED] _______________________________________________ ERPS-list mailing list [EMAIL PROTECTED] http://lists.erps.org/mailman/listinfo/erps-list _______________________________________________ ERPS-list mailing list [EMAIL PROTECTED] http://lists.erps.org/mailman/listinfo/erps-list
