Tony Fredericks "Mind that bus!" Amateur Rocket Scientist "What Bus?" E.R.P.S. Member SPLAT!! - Arnold Rimmer
From: Henry Spencer <[EMAIL PROTECTED]> To: ERPS <[EMAIL PROTECTED]> Subject: Re: [ERPS] FYI - Aviation Week Aerospike article Date: Fri, 4 Apr 2003 16:28:49 -0500 (EST)
On Fri, 4 Apr 2003, Pierce Nichols wrote:
> a) a significant amount of the total thrust should be produced by the
> expansion of the gasses against the spike. Other than direct measurement,
> this can be inferred from careful observation of the plume and/or
> demonstration of performance characteristics that indicate that this is the
> case. To my mind, this is the definition of an aerospike -- other
> properties and advantages flow from this.
Technically, for it to be an *aero*spike, the spike must be truncated, and after the wake closes, there must be some thrust contribution from base pressure (the exhaust gas expanding against the virtual spike formed by the trapped gas).
Henry Spencer [EMAIL PROTECTED]
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