Henry Spencer wrote: >> Where in some instances the tail will wag the dog.
HS> That particular problem can be reduced, for single-axis gimbaling, using HS> the technique used for the British peroxide engines: put the gimbal axis HS> at roughly the engine center of mass, rather than up above the engine. HS> (The Brits took this one step farther and ran the propellants in along HS> the axis, one from each side, so that they could use rotary seals rather HS> than flexible hoses.) If memory serves there are also Russian examples of single- axis hinged vernier engines running on LOX/Kero, where the propellants go through the hinges and tightness is achieved by rotary seals. A good and inexpensive solution compared to restrained metallic bellows especially if it comes to higher pressures. Hans Ulrich Ammann mailto:[EMAIL PROTECTED] _______________________________________________ ERPS-list mailing list [EMAIL PROTECTED] http://lists.erps.org/mailman/listinfo/erps-list
