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Space Projects / Re: Stratolaunch
« Last post by steelpillow on Today at 11:25:22 am »
Can't help thinking that the parallel to draw is that Pegasus started out as a cheap idea that got expensive in real life, while Virgin Orbit started out as a cheap idea that will soon get expensive in real life.

Just another case of underestimating the structural penalties of carrying a loaded rocket horizontally.
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Postwar Aircraft Projects / Re: VTOL On Demand Mobility
« Last post by AeroFranz on Today at 11:15:42 am »
side note on stacked rotors (two on top of each other, driven by separate motors), be it for open or ducted rotors.
The stacked rotors are undeniably more compact, but unfortunately they don't decrease discloading (thus power required to hover) like individual rotors do. That is, what matters is the projected swept area of the rotors as seen from the top.

Additionally, the propellers have to be optimized to work together (i.e., the lower one is operating in the exhaust of the top one). So when one of the two motors goes out, the remaining propeller is  a) working with some sort of blockage from the stopped prop, regardless of whether it's upstream or downstream, and b) it no longer has the optimum twist since the flow conditions have changed drastically.
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Early Aircraft Projects / Re: Delanne projects and prototypes
« Last post by avion ancien on Today at 10:13:46 am »
A few photographs of the Delanne 10-C2 which formed part of an exhibition at Giremoutiers on the occasion of the inauguration of the plaque commemorating the death of Guy de Châteaubrun, who was flying the 10-C2 when it crashed at les Fermiers, in that commune, on 10 August 1938.
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Space Projects / Re: Stratolaunch
« Last post by fredymac on Today at 09:42:30 am »
Whether or not air launch has a viable business case now rests with Virgin Orbit.

The Pegasus launch system is a strange case where the initial cost estimate was a small fraction of what was eventually charged.  The explanation for the cost rise was always a bit nebulous and centered on payload integration.  Virgin Orbit is pegging its sales to keeping costs low so this will remove that issue.
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According the text

A group of US engineers  made the plans for this Giant Aircraft

wing span 183 meter or 600 ft. lengt fuselage 100 meter or 328 ft.
12 engines with total capacity of 10000 horsepower
it need 13-16 hours to cross the atlantic
1500 passengers + crew !

Each  passengers pay 900 reichsmark = 13000000 reichsmark each flight.
next to that income by post and cargo

the Airliner has own build in Cranes and big entrance for Passengers
is airliner also equip with dining hall, gambling room, smoker room, observation/promenades deck.
has garage for passengers cars and two hangars for small aircrafts launch by catapult

odd the Bel Geddes Air Liner No. 4 has similar concept, but is half in size and capacity
I wonder if this giant airliner is related to aeronautical engineer Dr. O.A. Koller ?


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Early Aircraft Projects / Re: Projects in Switzerland
« Last post by Kuno on Today at 09:11:54 am »
Dear Roggerob

I have now thoroughly researched the "SB-2" and whilst the designers were actually "looking" at the wing of the "Lysander", they did not have any technical data of the "Lisanders" wing. But they had a Fieseler Fi 156 "Stosch" avaialbe and also made a wind tunnel model of the "Storch" - the Wing of the SB-2 was an own development of the "Studienbüro für Spezialflugzeuge" at ETH Zürich. There is not a single hint or even avidence that Muarice Hurel was involed at all. I would also strongly doubt that the desing of the SB-2 had any influence on the design of the "Beaver" or later the "Broussard" of Max Holste - the "comparable look" which comes from the use of the "Wasp Junior" and the fact that all three A/C are "high-winged" is possibly visually misleading.
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Postwar Aircraft Projects / Re: SIPA Projects
« Last post by hesham on Today at 07:17:31 am »
From Decollage 2/1947.
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Space Projects / Re: Stratolaunch
« Last post by steelpillow on Today at 07:01:04 am »
I'm tempted to say - give Roc a huge cargo pod and use it to beat the crap out of the An-225 !  That's the only way to salvage something useful out of that fiasco...

Unfortunately, its wingspan is too large to operate from most airports. They would have to be cropped short before a cargo flight could go anywhere. One reason the Airbus A380 has it tips turned up.
And even the AN-225 Mriya struggles to find a market.
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Early Aircraft Projects / Re: Me209 as a fighter
« Last post by newsdeskdan on Today at 06:38:24 am »
any original drawing or document regarding the me 209 H?

Documents yes, drawings no (drawing III/548 was sadly not appended).
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