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1
Space Projects / Re: ARCA Haas 2CA rocket (SSTO with aerospike engine)
« Last post by Zootycoon on Today at 01:05:03 pm »
There's no "combustion chamber" on the demonstrator;- it's a cold rocket using decomposed HTP;- they claim this can get into space? They're also assuming 1g acceleration as well as there's no inertia factor on the tank pressure.

I've not figured out the tank construction yet but it's not following the route I would expect for a filament wound structure but "it's the lightest such pressurised tank ever made"?

Yet to see any sign of carbon or vacuum bag consolidation or auto-clave. It's either staggeringly clever or ........   

First commercial payload launch in just under 2 years

At least it's entertaining so I'll await next instalment with interest.

3
Naval Projects / Re: Queen Elizabeth Class (CVF) development
« Last post by GTX on Today at 11:57:54 am »
The aardvark??
4
Early Aircraft Projects / Re: Cierva/Weir Prototypes and Projects
« Last post by hesham on Today at 10:52:34 am »
Nice find Schneiderman.
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Early Aircraft Projects / Re: Cierva/Weir Prototypes and Projects
« Last post by Schneiderman on Today at 10:39:40 am »
Better to go back to the original illustration.

G & J Weir took out many patents in association with their chief engineer/designer Cyril George Pullin. Most related to aspects of power and control of helicopters, including 563427 which was a form of torque control using ducted jets. Another was 5724127 for a 'fenestron', and 556865 which for a torqueless rotor powered by tip jets.
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Naval Projects / Re: Queen Elizabeth Class (CVF) development
« Last post by Arjen on Today at 10:06:14 am »
Thales Cerebus Cerberus
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Early Aircraft Projects / Re: Loire and Loire-Nieuport projects
« Last post by hesham on Today at 08:49:14 am »
Loire 40 :single seat lightweight fighter with 300 hp Gnome-Rhone Titan II engine.
 
Loire 41 :  ,,      ,,        ,,             ,,     with 500 hp Hispano-Suiza 12Mc engine.
 
Loire 42 :  ,,      ,,        ,,             ,,     with 420 hp Gnome-Rhone 9 Asb Jupiter VII engine.

From Le Fana 27.
10
Space Projects / Re: ARCA Haas 2CA rocket (SSTO with aerospike engine)
« Last post by merriman on Today at 08:21:45 am »
They keep charging along. Can't damn them for that. The model-builder part of me is enjoying this display of fabrication skills.

One rational for the linear (ramped) aerospike over the annular is its ability to produce pitch, yaw AND roll moments without moving the entire engine or engine elements, or use of dedicated roll thrusters.

Spring for the pumps, guy's! Tankage killed the X-33. Don't let the same issue kill this effort.

David
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