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Comments on: DARPA whirly-wing jet gyrocraft hits noise snags

Tip Jet noise cancel 

Posted Friday 11th January 2008 02:18 GMT

Coat

"We have an alternate design that... should have a dramatic effect on tip-jet noise,"

Everyone in range of the sound put in earplugs?

<No need to shove, I'm going, but I need my coat....>

Wow... 

Posted Friday 11th January 2008 05:32 GMT

That Fairey Rotodyne was so cool...

Too simple? 

Posted Friday 11th January 2008 08:35 GMT

Am I being even more stupid than normal or would it not be possile to use a turbine to 'draft' the rotor around in the initial stages? This seems so obvious in these days of NOTAR helicoptors (no tail rotor for those behind the pack with acronyms) as it could use the exhaust gasses from the forward motion engines and greatly simplifies the main rotor construction.

If no-one has thought of it then dibs on the patent...

those boffins had it good... 

Posted Friday 11th January 2008 08:39 GMT

Fantastic film.

Aah the days before MBAs and outsourcing, when stuff got built quick and the future was shiny and bright, and the managers actually understood the stuff their minions built (or at least knew enough to keep out of the way). I doff my cap to the boffins , engineers and assorted technicians that made it happen. Am I alone in thinking that we'd struggle to build such a thing today ?

Getting my (lab) coat already...

Rotodyne 

Posted Friday 11th January 2008 08:45 GMT

I built the Airfix model of the Rotodyne when I was a kid...I liked the idea of it.

Err. prototype for Terminator 2 

Posted Friday 11th January 2008 09:14 GMT

Coat

I'd forgotten about the Rotodyne.

But seeing the YouTube clip reminded me of the opening sequence to Terminator 2..... !!

Oh look... 

Posted Friday 11th January 2008 09:17 GMT

Thumb Down

..it's Eurostar-like times, tens of years before the Eurostar! And no sodding infrastructure to build and maintain!

The human race is never going to learn, are we?

Airwolf? 

Posted Friday 11th January 2008 09:28 GMT

Where are youuuu?

The Plan.. 

Posted Friday 11th January 2008 10:13 GMT

Coat

1. Get fat research grant from DARPA

2. Build unsuccessful prototype for waaaaaaay less than grant value.

3. ???

4. Profit!!

The coat with the rotors, please...

Ah the days... 

Posted Friday 11th January 2008 10:21 GMT

..when future technology was exciting and inspiring.

@ Kevin Johnston 

Posted Friday 11th January 2008 10:22 GMT

Juan de la Cierva (the inventor of the autogiro) did this long before you mate!

commercial airports 

Posted Friday 11th January 2008 10:32 GMT

Why don't they just not use the tip jets at commercial airports and have a take off roll like a normal autogyro instead?

I doubt there are the same noise requirements in military environments.

Airfix 

Posted Friday 11th January 2008 10:40 GMT

I too was going to say I'd built the model - first time of seeing the film. Looked bloody good too. I believe it was cancelled by the then old Labour government under Wislon along with the TSR2 - which was another those 'what if we'd carried on with it' aircraft - who knows. Re-inventing wheels again!

<sigh>

British Boffinry at it Best 

Posted Friday 11th January 2008 10:58 GMT

Thumb Up

What do you get if you cross a bunch of clever people, hardly any cash and box that your not allowed to think inside of?

Stuff the Yanks reinvent in 50 years later!

Where's our government pork going then? I'd rather it was on this sort of stuff than ID Cards. Apparently we are in a knowledge economy now, uh oh i think that means we are in trouble unless the Chancellor splashes some cash on the mad project boffin brigade.

Re: those boffins had it good... 

Posted Friday 11th January 2008 11:07 GMT

Coat

"Am I alone in thinking that we'd struggle to build such a thing today ?"

In the immortal words of Douglas Adams

OK wise guy, you tell us what colour it's supposed to be!

Wow 

Posted Friday 11th January 2008 11:11 GMT

Thumb Up

That Rotodyne was pure Gerry Anderson.

Stuff noise pollution. We need Rotodyne!

A minor technicallity 

Posted Friday 11th January 2008 11:31 GMT

Coat

What you have to remember is the jet tips use cold gas. It's bad enough having all the plumbing from the engine to the rotor tips, but imagine having to lag it all. The rotors would be 4 foot thick.

I seem to recall Fairy's had a small version of the Rotordyne called the Gyrodyne, which they managed to launch off the back of a 3 ton truck.

Anyone wanting to be really depressed by all the nice toys our 50's & 60's boffins cooked up only for the govt to tell them to stop or we'd upset the Yanks should get hold of a book called Project Canceled.

Rotodyne re-born 

Posted Friday 11th January 2008 12:03 GMT

The rotodyne was a fantastic aircraft - and the scientists at the time seemed to have resolved the noise issues.

I say lets re-start this project before the Americans grab the market with one of their over-engineered solutions.

If the Government could channel a tiny fraction of the money that it wastes on NHS bureaucracy to projects on this kind, it would really help boost British industry and encourage youngsters to study science.

Ah happy days... 

Posted Friday 11th January 2008 12:07 GMT

as a kid standing in my back garden as a kid watching a Rotodyne flying over for the Farnborough Air Show...

When the future looked bright and full of wonderful technology.

You would have thought... 

Posted Friday 11th January 2008 12:18 GMT

Black Helicopters

...that they might have learnt something from the Osprey program.

http://www.time.com/time/politics/article/0,8599,1665835,00.html

Meh. 

Posted Friday 11th January 2008 14:09 GMT

Coat

If the tip jets are just to get the rotor going to provide the initial lift, why don't they just use a giant rubber band?

Hedgehoppers Anonymous 

Posted Friday 11th January 2008 14:42 GMT

Surely STOL would require no powered Spinning Rotor for Lift .... only a Brake to stop it Spinning Freely ...... a la Little Nelly.

Old toys 

Posted Friday 11th January 2008 18:49 GMT

Black Helicopters

Interesting stuff, and yet more evidence that ideas are rarely unique - the only variations are whether the end product ever gets completed, delivered and works.

Or people just repeat the previous concept unknowingly, and find the exact same flaws. Sometimes knowing some history can save money.

Checking some of the old UK programs out is always interesting - Avro 730 & Bristol 188 looked like they could have been good stuff (like so many other things); somehow I couldn't see anything like that happening today, except maybe the same kind of destructive political input...

High Disk Loading on V-22/Similar Concept from Another Company 

Posted Friday 11th January 2008 23:02 GMT

Regarding the statement in the article of the V-22 attaining VTOL and high speed, that's true, but the V-22 has very high disk loading, and so is limited in its gross weight. A large, single rotor would have much lower disk loading, and allow higher gross weights for the same power.

For a small bit of self-promotion, I work for a company that has a similar concept. We are aware of the Fairey Rotodyne and the problem of noise with tip jets, so we are using a more conventional gearbox & driveshaft system.

http://www.cartercopters.com/heliplane_overview.html

"exceptin' always Steam." 

Posted Saturday 12th January 2008 08:51 GMT

Unleash British boffinry on the problem.

A quick squirt of hydrogen peroxide should be enough to spin the rotors. Hot steam and oxygen: add a bit of kerosene and you have a satellite launcher.

Morris dancers building a steam rocket: if you put that in a movie, nobody would believe it.

@British Boffinry at it Best 

Posted Saturday 12th January 2008 09:21 GMT

Yeah! What were the yanks ever doing back then?

Except going to the FUCKING MOON.

@@British Boffinry at it Best 

Posted Sunday 13th January 2008 08:04 GMT

"Yeah! What were the yanks ever doing back then?

Except going to the FUCKING MOON"

I didn't think the original poster was being anti-american. Not all discussions have to centre on the USA- the discussion has been around great stuff we have done and what might have been. By understanding what has happened in the past we might learn how to do things better in the future e.g. not putting square windows in a pressurised cabin.

Also some would say the Apollo programme's success owes a great deal to Wernher Von Braun and the other german rocketeers who moved to the United States after the war (and the bucketloads of cash) so maybe not the best example of American genius (of which there are plenty - the Liberty ships, the airframe of the P-51, ILM etc ).

Space race 

Posted Monday 14th January 2008 09:08 GMT

nor were we, (the Brits), enagaged in the Space race, that diverted God knows how much money away from more moundane things like a national health service, and into demonstrating that the yanks were as capable, (if significantly later), than the Soviets.