STS-51F
Yes, the inlet air temperature, after the triple shock acceleration from freestream to Mach 5. Not the skin temperature - Skylon is expected to only reach 1100K on re-entry - with hotter cannards and leading edges.
... at 30,000 meters. it reached about 500C, with some hot spots around twice that The x15 was designed to test re-entry conditions by flying fast and level altitudes- the Orbital 500 isn't designed to test re-entry conditions, so while it briefly does Mach 8 at that altitude before climbing and slowing to Mach 4 at 80km, it is doing that in a blunt body pose, not a streamline one - and on that first hot dip it's below 40km feet for less than 30 seconds.
At the end of the day, this is pointless speculation. If the next stage of the project is funded I'm sure Strathclyde will run their re-entry software over it, refine the shape, then work out what's hot and what's not.
Quote from: JCRM on 09/02/2017 12:18 amSTS-51FI stand corrected. Under certain circumstances the SSME's were indeed able to compensate for small thrust reductions,
but one of the reasons mfg the SRBs was tough was to ensure very close thrust balance, which would have only been discovered during SRB ignition.
When most people talk about "engine out" they mean throughout most of at least the first stage flight.
Quote from: JCRMYes, the inlet air temperature, after the triple shock acceleration from freestream to Mach 5. Not the skin temperature - Skylon is expected to only reach 1100K on re-entry - with hotter cannards and leading edges.You have that backward. The air is decelerated in the inlet,
Given the design is an air launch assisted TSTO it might be the severe thermal issues that drove REL to go with Pyrosic don't apply
Quote from: JCRM ... at 30,000 meters. it reached about 500C, with some hot spots around twice that The x15 was designed to test re-entry conditions by flying fast and level altitudes- the Orbital 500 isn't designed to test re-entry conditions, so while it briefly does Mach 8 at that altitude before climbing and slowing to Mach 4 at 80km, it is doing that in a blunt body pose, not a streamline one - and on that first hot dip it's below 40km feet for less than 30 seconds.Except where they got shock/shock interference heating (Edney Type III and Type IV IIRC) where that goes to more like 4:1 or above, which is what sheared off the dummy SCramjet they were testing.
I like the concept, although there are very vague on what engines they are looking at.
I'm more concerned about the business model and the market.Talk of vast low orbit constellations puts me in mind of Geostar, Orbcomm and Iridium, and not in a good way.