I've red a lot about that H2O2 stuff - and the record is definitively mixed and controversial.
Some points
- H2O2 needs to be 98% pure to get max specific impulse out of it (324 seconds is feasible)
- 85% or 90% instantly degrades the specific impulse to 280-290 seconds - although it improves handling and safety
- the purer the H2O2, the worst it reacts to impurities, including water vapor from the atmosphere
- The NF-104A (three built and flown for 8 years 1963-71) is typical of H2O2 mixed record
- It did not killed any pilot yet at some point in the late 1960's was a hangar queen because that H2O2 in the rocket created many structural issues
- H2O2 from 1945 to 1980 had some purity issues that led to severe accidents
- Yet from the moment it became part of hybrid rockets (besides solid fuel: AMROC, 1985) and then of Andrew Beal BA-2 project (1997), new manufacturing processes with more purity vastly improved H2O2 handling and safety

I have a whole bunch of documents on my HD if anybody is interested.

H2O2 was once my favorite "begnin" oxider for suborbital refueling rocketplanes; but since then I've learned about NYTROX which is a blend of N2O and LOX, lowering their freezings points (-183°C for LOX, -88°C for N2O). Nytrox could get a gentler -50°C without losing too much specific impulse.

But fact is that finding a non-deep-cryogenic, non-toxic, non-unstable oxidizer for rocketplanes is next to impossible. N2O sucks, H2O2 explodes, LOX is too cold, N2O4 is a corrosive and toxic b*tch of a substance. And with the aforementioned four, 90% of potential rocket oxidizers have been mentionned.
That list perfectly summarize the issue.
Ammonium dinitramide
Ammonium nitrate
Ammonium perchlorate

Chlorine pentafluoride
Chlorine trifluoride

Dinitrogen tetroxide (N2O4: storable hypergolic Ariane / Proton / Titan / Long March oxidizer)

Hydrogen peroxide (H2O2)

Liquid oxygen (LOX)

Mixed oxides of nitrogen

Nitronium perchlorate
Nitrous oxide (N2O)

Oxygen difluoride

Perchloryl fluoride

Red fuming nitric acid

T-Stoff
Tetrafluorohydrazine
Tetranitromethane
Trinitramide

What is not storable / hypergolic (N2O4 and others) is horrible and murderous stuff (fluorine & "a good pair of running shoes" in the words of John Ignition Clark) .

And once all the nasty substances are removed, all that's left are the trio LOX (deep cryogen) H2O2 (unstable explosive bastard) and N2O (suck at performance, mild-cryogen, and killed three Virgin / Rutan / Scaled employees in July 2007).

That's why nytrox is interesting: it very much tries to blend LOX & N2O into a more begnin substance to compete with H2O2 as "alternative oxidizer to sacrosanct LOX".
 
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Fully developed version of SR.53/SR.177:
Air Launch Maximum Ceiling: 157,700 metres
Maximum Speed: 5,852 kph / Mach 5.5 @ 25,400 metres
 

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Fully developed version of SR.53/SR.177:
Air Launch Maximum Ceiling: 157,700 metres
Maximum Speed: 5,852 kph / Mach 5.5 @ 25,400 metres

But the heat barrier may disagree...

In contrast with that, the altitude might be a touch more realistic, although 100 miles is quite enormous - moar than the X-15 !
 
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Featuring Dick Stratton - Wonderful chap;- I had a hosted lunch (ie a group of us young aero engineers) with him in the early/mid eighties, unfortunately before I knew he was Chief Engineer on the 53/177. Form memory he mainly talked about his time on the Princess;- “one day I was twenty eight year old, drawing up a section of the flying controls and my boss asked;- Dick are you sure they’ll work ? So I replied that I had absolute confidence, to which he replied;- that’s good because we want someone like you on the first flight……. And that’s how I became the Princesse’s ‘chief stoker’ on its maiden flight a year or so later”
 
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I wonder if we'll ever get to see photographs of the prototypes under construction before they were ignominiously junked as a result of that fool Duncan Sandy's short-sighted 1957 defence white paper?
 
Last I checked the Saunders-Roe corporate archive still exists but had been moved to deep storage and was not accessible. It cetainly contains multiple brochures and photos.
 
I'll post a PDF of this document tonight. With the Australian national archives, if anyone asks for a scan, it is immediately made available online for everyone, so presumably someone requested a scan of this recently - it was not available a year ago.
 
Ok had a read and quote curious it is.

Essentially in Ground Attack it's rather limited in the then funded and intended clearance of armaments.
It would require firstly a wider range of stores cleared and then ideally (from a RAAF perspective) the RAF to fund a more general purpose version.
For example pylons cleared for 200gal drop tanks should be good for 1,600lb stores.

Right near the last few pages (quite a bit is repeat copies) lurks a Training radius on all kerosene fuel of 650nm without drop tanks and statement drop tanks could extend by 100nm to 200nm the RoA.
 
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I wonder if we'll ever get to see photographs of the prototypes under construction before they were ignominiously junked?

With Gloster’s GA6 Thin Wing Javelin, a photo report was made of all the flight hardware and jigs in order to support Gloster’s contract closure cost claim. I have a copy (original with highly appropriate custodian) and have published a few photos on this site. This was likely to have been the standard procedure at the time, hence there would have been a report with a couple of hundred photos of the SR177. I wonder if any copies survived?

The similar TWJ came from a former project engineer who just felt it was right that this piece of history shouldn’t have been lost, so the SR177 equivalent just might be out there.
 

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