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Old 16th Jun 2008, 10:57   #1 (permalink)
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No tail rotor, no tail boom, no H-V worries...Pegasus helicopter

Have been watching this for a while, and it won't seem to go away...

Pegasus has developed a safe, low-cost, easy-to-fly two-seater helicopter based on breakthrough pressure jet technology that significantly reduces the number of parts used compared to a conventional helicopter. Most notably it has no tail rotor, therefore no tail rotor gear box, tail rotor drive or tail boom. Likewise, it has no main rotor drive system or complex transmission for the main rotor. As a result of these simplifications, Pegasus believes its PH-200PJ is dramatically easier to operate - and safer - than conventional designs.

See also http://www.pegasushelicopters.com/

...and video: http://uncutvideo.aol.com/videos/933...76b22d0be319d8
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Old 16th Jun 2008, 11:07   #2 (permalink)
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No T/R, no boom...

WTF... now that is amazing!

How far of certification is it?

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Old 16th Jun 2008, 11:51   #3 (permalink)
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Ok, somebody help me out here.

Maybe I should know already, and it does seem like I've read it before somewhere but what is "Breakthrough Pressure Jet Technology", pray tell?
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Old 16th Jun 2008, 12:06   #4 (permalink)
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'Fly in to the Danger Zone'

Maybe this speaks volumes about such a design
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Old 16th Jun 2008, 12:15   #5 (permalink)
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It is unlikely they will ever attempt to get certification.
The minimum cost to get any aircraft certified is in excess of $100 million - the Eclipse jet (which is merely a new type of proven design) has already gone through over $500 million).
He'd be better off to either keep it as a kit or sell the idea to a major company.
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Old 16th Jun 2008, 12:38   #6 (permalink)
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Want one, and want it Now, looks very exciting, hopefully I could part ex Mrs Vfr or somthing similar from the garage

Peter R-B
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Old 16th Jun 2008, 12:48   #7 (permalink)
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Mmmmmm .......

What is amazing ...is the LACK of information.......

Looks like a sort of re-invention of the Sud Aviation Djinn of so many years ago ..... perhaps with a few modern twists??

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Old 16th Jun 2008, 13:20   #8 (permalink)
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I wonder how noisy it is...? (Especially compared to an H500.)

IIRC, exhaust noise is the major downfall of any tip jet design.
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Old 16th Jun 2008, 13:23   #9 (permalink)
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The thing that's puzzling me is how does pressure tip technology remove the H/V curve? Whatever the means of driving them, the blades must slow when the drive is taken away. There has to be a certain time taken to enter autorotation. Do the tubes running down the blades mean they've got so much inertia that the pilot would have to have the reaction times of a zombie to fatally lose RPM?

There's a list of reasons given as "Why pressure tip technology". How are some of the advantages stated due to pressure tip technology? For example, why would that make it more stable/easier to control? Or give it more payload? or more speed? (Would this be because of the missing gearboxes and running gear for the TR?) Presumably the no icing claim is because it's less susceptible to icing due to the gasses running down the blades. And as for less noise I thought tip jets howled like Banshees.
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Old 16th Jun 2008, 18:54   #10 (permalink)
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Now if they eliminate the pilot....they would be on to a sure thing!
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Old 16th Jun 2008, 19:05   #11 (permalink)
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No information

I am with spinwing on this.
No real info & the French did it years ago
Link to one on Ebay in AUS

A slight worry is the wooden mast and gutter bolt blade retention system, but it is a 50s design so what do I know.
scroll to top of advert a lot of info\history on type.
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Old 16th Jun 2008, 19:08   #12 (permalink)
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Djinn certainly looks like, anyone talk to an old Djinn Pilot, Steve Colton, last certified pilot in uk?
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Old 16th Jun 2008, 21:34   #13 (permalink)
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Looks Good to me

No tail with which to knock taxiway lights over! Materials technology will probably make this possible for bigger machines in a few years. I would have thought the weight of blades able to contain a spar and jet system would do interesting things with rotor head forces for large helicopters.
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Old 17th Jun 2008, 01:51   #14 (permalink)
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Me old Mucker

Steve Colton,
Where are yu,still in France? Pm me.
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Old 17th Jun 2008, 01:59   #15 (permalink)
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Don't you all know it's going to be a Dark Matter fuelled perpetual motion engine that will provide endless inertia, thus no H-V diagram required.

The structure will be filled with Helium and remove the requirement for power to lift the entire array, with the rotor remaining solely to provide speed and direction.

Now what are those men in white coats here for? Tra la, tra la, tra la.....
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Old 17th Jun 2008, 09:37   #16 (permalink)
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I think with a little bit of know how, we could possibly build a "Biggie" possible based in London to fly say 20 or 30 people across to Paris, have a day out and fly back to central London,...... Didn't BEA try this in the late 50'S with the Fairy Rotodyne, perhaps seal technology and power to weight ratios are far superior to those days, but what would it cost, could this so called revolution can the V22 Osprey?

Peter R-B
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Old 17th Jun 2008, 18:31   #17 (permalink)
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Let me know if you find him, last time I saw him was about 1987, and he was apparently asked to air test a Djinn by the CAA after a rebuild!!, because he was the last certified pilot!!, dont know if he ever did, or if it was a pub story in the bar at Aberdeen airport after a two week tour on the Treasure Finder.

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Old 17th Jun 2008, 19:48   #18 (permalink)
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but what would it cost, could this so called revolution can the V22 Osprey?
Two american companies:

Groen Brothers

work on the modern version of the Rotodyne concept, both financed by DARPA.

Funny, that allegedly it were the Americans who made the UK government to kill the Rotodyne project,
scrap all the tooling and close the company...
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Old 18th Jun 2008, 01:45   #19 (permalink)
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It sounds like the Groen brothers are not doing so well:

Rotorhub Story

They tried to hire me and some of my compadres a couple years back, I was not a firm enough believer in their dream to take the leap.

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Old 18th Jun 2008, 10:35   #20 (permalink)

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Astheticaly it's bl00dy aweful, i wouldn't want to be seen in it!!
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