Considering that Pegasus is capable of puting a payload in to LEO,
Pretty fast. Much faster than Mach 3. According to the NASA Site, it is
something over Mach 4, and 95000 feet MSL--well beyond the operating
capability of the Blackbirds. Check
On 23 Nov 2004 03:11:39 GMT, in sci.engr.mech firstname.lastname@example.org
Depends upon the deign. Lower that Mach 4, how much is an issue. Recent
programs have looked at designs which would start around Mach 3.5 using
either turbine or rocket based low speed systems to get them there.
Specifically with regard to the Hyper-X tests, these were point deigns. The
engines for the Mach 7 and 10 tests were optimized for operation at each
specific test point.
In each of the two Hyper-X tests the Pegasus actually boosted the research
vehicles to Mach numbers slightly over the test point. Ie the faster speed
reached in each flight was during the final portion of the boost phase. The
RV slows down a bit after separation from the booster while it's attitude
is adjusted and then during a cowl open unfueled tare portion preceding the
scramjet powered portions of the flights.
Doesn't matter, there are no operational SR-71s. Also the track recode of
launching the D-21 drone from between the tails was not so good. The
designs of turbine and rocket based combined cycle systems mentioned above
assumed ar-launch of the B-52 around Mach 0.8, using the turbine or rocket
systems to get to scramjet takeover. The programs doing this, X-43B and
ISTAR were canceled over a year ago.
Ed Ruf Lifetime AMA# 344007 ( snipped-for-privacy@EdwardG.Ruf.com)
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