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Edited by Christian Lowe | Contact

The "Deadlies": Killer Rocket Plane (Updated)

Readers of my book, Weapons Grade will have seen the chapter on technologies which looked promising at the time but which failed to deliver. Perhaps the most lethal example is the German WWII Me163 Komet, a rocket-powered interceptor which is surely a hot contender for The Deadlies.
komet.jpg

On paper it looked great; the first plane to break the 1,000 kph (625 mph) barrier, it seemed like the ideal weapon to take on Allied bomber formations. It would be much too fast for the fighter escorts to stop.

In practice it was the deadliest plane ever built.

At the heart of the Komet was a rocket motor which mixed oxidising agent (a hydrogen peroxide mixture known as T-stoff) and a fuel (hydrazine hydrate, methyl alcohol, and water, called C-stoff). These were combined explosively. The small motor generated 1,500kg of thrust for an aircraft that only weighed 1,900 Kg, twice the thrust-to-weight ratio of the Me262 jet fighter which was itself considered awesome for the time.

But it was the sheer variety of ways that it could kill you that made the Komet unique.

- The controls tended to lock up, leaving the plane going in a straight line. If this happened during the attack dive, the Komet could accelerate to high speed and broke apart. Otherwise, it just ploughed into the ground like a thunderbolt.

- The exhaust plumbing could crack on take off. A leak into the cockpit would fill the cockpit with steam making vision impossible.

- T-stoff, concentrated hydrogen peroxide, is a powerful corrosive and the pilot pilot sat between two tanks of it.
"One pilot did get dissolved by T stoff flowing into the cockpit after the aircraft crashed on take-off and inverted," says DefenseTech reader Pat Flannery.

- The commonest and cruellest problem was the controlled explosion which drove it. The Komet had a skid rather than wheels, so landings were hard (many pilots suffered back injuries). If there was any fuel left in the tanks, the shock of landing could mix it suddenly, and the returning hero would go up in a fireball.

Three hundred and seventy Komets were built; they shot down nine Allied bombers between them. About five per cent of the Komets were lost to Allied fire in the air; fifteen per cent were lost due to problems with the controls and hydraulics. The other eighty per cent were victims of explosions.

No wonder pilot’s nicknamed it “The Devil’s Sled" - a fast ride straight to hell.

Can anything beat the Komet for the "Deadlies?" If you've got any ideas E-mail or post it here.

-- David Hambling

Thanks to Pat Flannery for the corrections

Comments

It's an incredibly complex and advanced achievement by his day; The Luftwaffe displayed a technology in response to a vital necessity: the point-defense interceptor.
The next step would be the VTOL interceptor, and the ultimate one, the rocket unmanned interceptor, also know as the guided anti-aircraft missile. Both too late to change the fate of airwar.

Posted by: CUTANGUS at May 4, 2008 01:58 PM


I think you missed the mode where upon jettisoning the takeoff wheels they would bounch off the ground and hit the airplane before it could gain altitude.

All that said, it is a good thing IMHO that the Japanese never perfected their version [1] - it would have made an excellent suicide airplane against air or sea targets.

Cranky

[1] Mitsubishi Ki-200 - one actually survives at the Planes of Fame in Chino.

Posted by: Cranky Observer at November 27, 2006 12:53 PM


It is the same fuel that was used in the X-15. Good info in the book written Milton Thompson (I think).

Posted by: vstress at November 24, 2006 07:27 AM


What about the manned rocket Bachem Ba 349 Natter?

Posted by: Coljoe at November 24, 2006 04:04 AM



Pat,

Thanks for the corrections. It sounds like some of the sources on this have embroidered the tale over time, so it's good to get the story straight.

Posted by: David Hambling at November 24, 2006 03:16 AM


There are some errors in that article:
1.) Although it didn't have an ejection seat, you could bail out of the Komet in the conventional manner, after jettisoning the canopy.
The Germans developed a special high speed parachute for use with it, due to the velocity the pilot might be moving when it deployed.
2.) The aircraft's hydraulic controls couldn't lock up as all the control surfaces were activated manually via cables and mechanical linkages, not hydraulics.
3.) Even in a power dive the plane couldn't go supersonic, as its wing sweep wasn't enough; as its speed approached that of sound drag would rise to such a level that it would stop accelerating even at full throttle due to its limiting mach number. It might break up, but it wouldn't go supersonic.
4.) The pilot wouldn't black out at high altitude as he wore an oxygen mask during the entire flight. The maximum alitude the Komet could achieve was 39,500 feet as it would be out of fuel at that point. I have never heard of one going in to an uncontroled climb with frozen controls, and I have three books devoted specificaly to this aircraft, as well as sections about it in several other books.
5.)As the motor and it's steam-driven propellent pump was at the back of the aircraft with the fuselage C and T stoff tanks between it and the cockpit, as well as a armored firewall, any steam leaks from the engine would not be able to penetrate the cockpit at a high enough temperature to "cook the pilot like a lobster". There were cases of steam getting into the cockpit on the aircraft due to plumbing leaks, but not at high enough temperature to hurt the pilot, who was wearing a protective suit of chemically resistant woven PVC fiber and his flight goggles and oxygen mask anyway.
He was pretty much covered head-to-toe in flight.
The blinding of the pilot was from trying to look through the steam fogging his cockpit and canopy, not damaging his eyes.
One pilot did get dissolved by T stoff flowing into the cockpit after the aircraft crashed on take-off and inverted, but the only time you were going to get baked is if the T stoff started to spontainiusly break down into superheated water and oxygen, and if that happens hot steam is the least of your worries, as the plane is going to explode a second or so later.
It didn't help matters that there was a T stoff tank sitting to either side of you in the cockpit.
"Can anything beat the Komet for the 'Deadlies?'"
The Ohka and Reichenberg IV suicide aircraft come to mind immediatly :)

Posted by: Pat Flannery at November 23, 2006 11:18 PM


Operation posed serious problems. The C-Stoff and T-Stoff tankers could not be allowed to come within half a kilometre of each other, so refuelling and rearming a squadron of Me163s was a fraught business to say the least. The flight line would be washed down by firetrucks between them.

When you imagine that they had to handle ammunition and oxygen cylinders at the same time, it's incredible they didn't manage to blow up the whole airbase.

Posted by: Alex at November 23, 2006 11:04 AM


The test pilots and pilots http://en.wikipedia.org/wiki/Hanna_Reitsch sure needed balls to fly the http://en.wikipedia.org/wiki/Messerschmitt_Me_163

Posted by: JQP at November 23, 2006 10:36 AM


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