Aleta Jackson wrote: > Bruno Berger wrote: > >> It was quite quiet lately about XCOR. Now they have tested a new >> kerosene engine with 2.5 x higher chamber pressure (still heat sink >> mode though): >> >> http://www.xcor.com/XR4K5-firstfire.html >> >> Do they use pump feed now? At least for the Xerus, pressure feeding @ >> 50-60 bar isn't very economical anymore. >> Bruno >> >> >> > Bruno, > We always run our engines in heat sink mode at first. And we continue to > work on the pump. Build a little, test a lot. > > Aleta
Sure, we are also doing this first. The "though" wasn't meant to belittle your approach, far from it :-) A heat sink engine gives you enough time (1 to several seconds) to test everyting, specially the ingition sequence. Ours were also very heavy walled to survive any hardstarts (would be a pitty to loose our nice liners with the milled cooling channels). About the pump... we have choosen to go the turbopump way. The project starts with a radial inflow turbine derived from a automotive turbo charger. The gas generator already works quite fine. Next step will be a test bench for the turbine (measure the torque at 60'000 rpm's and 50 kW shaft power isn't trivial... but feasible). The project runs in the frame of a students work at FHBB and has a low priority at the moment.
Bruno
-- Bruno Berger Swiss Propulsion Laboratory E-Mail: [EMAIL PROTECTED] WWW: http://www.spl.ch HAM: HB9RSU
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