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Author Topic: Project ISINGLASS & Project RHEINBERRY  (Read 130319 times)

Offline XP67_Moonbat

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« Reply #285 on: July 13, 2017, 06:34:03 pm »
Thank you, Mark
In God we trust, all others we monitor. :-p

Offline Mark Nankivil

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« Reply #286 on: July 21, 2017, 04:20:38 pm »
Good Day All!

Here are a few of the negative scans - thoughts on whether this is Model 192, Mach 12 Demonstrator or?!?!

Enjoy the Day!  Mark
« Last Edit: July 21, 2017, 04:23:27 pm by Mark Nankivil »

Offline Archibald

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« Reply #287 on: February 09, 2019, 01:18:13 am »
One question about Isinglass still puzzles me:  The engine seems huge for an air-launched vehicle. Mulready's book gives a loaded weight of 132,000 pounds, but that seems pretty massive even for a B-52, particularly asymmetrically carried, and still won't allow a lot of burn time on a 250K engine. And if you're launching at altitude, why do you need the two-position nozzle?

Is it possible that an early version of Isinglass was smaller and air-launched, but that it was ground-launched by the time the development work was under way?

So I have a few moments to do this.
Looks interesting !

Looking at BlackStar's .pdf from earlier (very quickly). Fig 29 says at altitude Isp is 440 secs at 30K-200K ft.
(booster config - think that is the two position nozzle config - not sure though - haven't read the whole thing yet - Thanks BlackStar!)
g = 32 ft/sec**2
Mf = Mass fully fuelled is 132,000 lbs (given from Mulready)
Me = Mass empty (structure, wings, electronics, dudes flying it, landing gear, etc) 40,000 lbs (just guessing).

DeltaV = Isp (secs) * g (ft/sec**2) * ln(Mf/Me) = DeltaV ft/sec
DeltaV = 440 secs * 32 ft/sec**2 * ln(132000/40000) = 16,810 ft/sec
Approx Mach 16.8
NotMach 22.We have to go lower for Me.

So what empty weight gives around Mach 22?

That would be around 27,650 lbs as:
DeltaV = 440 secs * 32 ft/sec**2 * ln(132000/27650) = 22,000 ft/sec= Approx Mach 22

So say you launch at 30,000 ft from B-52.
I think that this vehicle could add some lift (due to its lifting surface) and the rocket could
also potentially be burned if the B-52 could carry that extra fuel (they looked at this for the
M/D-21 as well). May burn the B-52's tail off though - :)

So you could go from essentially standstill (B-52's speed) to Mach 22 with the above Isp and
Mass Ratio according to the Ideal Rocket Equation (just a back of the envelope calc.)

rocket equation applied to ISINGLASS
9.81*450*ln(132770/24450)=7469 m/s

not included: air launch from the b52 +900 m/s

so 8369 m/s - so  close from earth orbit (9400 m/s) but not quite!

maybe they should reconsider fluorine: raising isp to 500 seconds would bridge the gap. Space shuttle here we go !! 

replace the b52 with a 747 (more practical) with ISINGLASS clung underwing Launcher One style.
« Last Edit: February 09, 2019, 02:11:49 am by Archibald »
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Offline PlanesPictures

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« Reply #288 on: February 09, 2019, 04:11:41 am »
"air launch from the b52 +900 m/s "- not only +300 m/s ?