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Search: Posts Made By: Dave_Jackson
Showing results 1 to 35 of 1000
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Forum: Rotorheads
9th Nov 2013, 19:05
Replies: 6
Views: 1,528
Posted By Dave_Jackson

Post Different rotary aerodynamicist will sometimes...

Different rotary aerodynamicist will sometimes use different symbols.
Wayne Johnson and Gordon Leishman uses the following. Gareth Padfield is more detailed but appears to be in agreement with the...
Forum: Rotorheads
26th Oct 2013, 18:14
Replies: 14
Views: 3,163
Posted By Dave_Jackson

Wink To attract a mate from the spectators? :) ...

To attract a mate from the spectators? :)

http://greenbuzzz.net/wp-content/uploads/2010/11/3196042214_1fb7bc41e4_z.jpg
Forum: Rotorheads
11th Oct 2013, 21:34
Replies: 85
Views: 35,807
Posted By Dave_Jackson

IFMU said; No math ~ honestly; Sikorsky's...

IFMU said;

No math ~ honestly;
Sikorsky's electric Firefly (http://www.sikorsky.com/Innovation/Technologies/Firefly+Technology+Demonstrator)was a much publicized project.
You may recall the...
Forum: Rotorheads
29th Jun 2013, 23:01
Replies: 33
Views: 14,304
Posted By Dave_Jackson

Bryan, Apparently, wings (and fuselage...

Bryan,

Apparently, wings (and fuselage etc.) cause the rotorcraft to act somewhat like a hovercraft. In other words, the wings are subjected to an upward force.


Dave
Forum: Rotorheads
29th Jun 2013, 20:09
Replies: 33
Views: 14,304
Posted By Dave_Jackson

Thumbs up vstol Agreed. Even Sikorsky has...

vstol



Agreed. Even Sikorsky has about a dozen patents on Variable Diameter Rotors; Sikorsky's Variable Diameter Tiltrotor (VDTR) (http://www.unicopter.com/1621.html)


Dave
Forum: Rotorheads
29th Jun 2013, 07:29
Replies: 33
Views: 14,304
Posted By Dave_Jackson

vstol As I recall from the article in...

vstol

As I recall from the article in Vertiflite, the craft was hovering in ground effect. The wings would significantly increase this hovering ability.

It is a beautiful looking craft, but...
Forum: Rotorheads
26th Jun 2013, 18:05
Replies: 33
Views: 14,304
Posted By Dave_Jackson

SansAnhedral Yes.

SansAnhedral


Yes.
Forum: Rotorheads
21st Jun 2013, 04:24
Replies: 139
Views: 60,056
Posted By Dave_Jackson

Tickle, This shows performance range of...

Tickle,

This shows performance range of different propulsors. It appears that free props are the most efficient.

Dave

http://www.unicopter.com/Propulsion_Efficiency.jpg
Forum: Rotorheads
19th Jun 2013, 03:29
Replies: 139
Views: 60,056
Posted By Dave_Jackson

http://www.unicopter.com/Flettner_185_Small.gif ...

http://www.unicopter.com/Flettner_185_Small.gif

If Flettner could only have seen what became of his Fl 185 seventy seven years later.
Forum: Rotorheads
21st Apr 2013, 20:55
Replies: 41
Views: 17,215
Posted By Dave_Jackson

The following may support your "The BERP blades...

The following may support your "The BERP blades fitted generate far more lift at the tips. .........."

From:~ Art of the Helicopter, by John Watkinson;
”The presence of the rotor head and blade...
Forum: Rotorheads
13th Apr 2013, 04:03
Replies: 50
Views: 9,716
Posted By Dave_Jackson

Mirek, No meaningful consideration about...

Mirek,

No meaningful consideration about variable solidity.
My closest consideration has been that of high solidity and variable tip speed, such as; DESIGN: UniCopter ~ Rotor - Disk - Large...
Forum: Rotorheads
5th Apr 2013, 23:54
Replies: 33
Views: 14,304
Posted By Dave_Jackson

Devil PPRuNe deserves the patents

AgustaWestland is applying for 3 US Patents on this craft. Application Nbrs; 20130026303, 20130026304, 20130026305.
Claims in these applications have been previously, and publicly, discussed on...
Forum: Private Flying
5th Apr 2013, 21:30
Replies: 165
Views: 29,703
Posted By Dave_Jackson

Perhaps eventually; The core of the wings...

Perhaps eventually;

The core of the wings and tail-boom etc. will be made of Ultra-capacitors.
In very strong updrafts the propeller and its motor will be used to charge these capacitors.
...
Forum: Rotorheads
23rd Mar 2013, 18:29
Replies: 32
Views: 9,012
Posted By Dave_Jackson

Congratulations. :D

Congratulations. :D
Forum: Rotorheads
11th Feb 2013, 19:46
Replies: 305
Views: 85,552
Posted By Dave_Jackson

John Dixson wrote; "Anyone know the provenance of...

John Dixson wrote; "Anyone know the provenance of the report?"

The Globe and Mail...
Forum: Rotorheads
21st Jan 2013, 18:56
Replies: 925
Views: 348,669
Posted By Dave_Jackson

Was it shown on the Military Channel in December,...

Was it shown on the Military Channel in December, as mentioned in the video?
Forum: Rotorheads
31st Oct 2012, 23:33
Replies: 32
Views: 5,007
Posted By Dave_Jackson

Cornu vs. Revisionist History

Leishman has produced another paper (2012), which is; Performance Measurements of a 1/6-Scale Model of the 1907 Cornu Rotor (http://www.unicopter.com/CornuAndRevisionistHistory.pdf).

In it Dr....
Forum: Rotorheads
28th Oct 2012, 21:12
Replies: 9
Views: 2,354
Posted By Dave_Jackson

cockney steve, Yes that does sound familiar. ...

cockney steve, Yes that does sound familiar.


Sav,

Thanks for the additional information.

The mention of "three-bladed rotors" on an Intermeshing helicopter means that Flettner was...
Forum: Rotorheads
18th Oct 2012, 03:56
Replies: 9
Views: 2,354
Posted By Dave_Jackson

riff_raff Thanks for he leads. The DTIC is...

riff_raff

Thanks for he leads. The DTIC is totally new to me. It will be looked into.


Dave
Forum: Rotorheads
15th Oct 2012, 20:48
Replies: 9
Views: 2,354
Posted By Dave_Jackson

extrarotorwash Thank you for the lead....

extrarotorwash

Thank you for the lead. There is information about him on the internet that may be interesting.

Dave
Forum: Rotorheads
14th Oct 2012, 04:14
Replies: 9
Views: 2,354
Posted By Dave_Jackson

riff_raff Thanks for the info. Have sent...

riff_raff

Thanks for the info.
Have sent you a private message.

Dave
Forum: Rotorheads
12th Oct 2012, 22:24
Replies: 201
Views: 61,161
Posted By Dave_Jackson

Hi riff_raff, Today a person asked me for...

Hi riff_raff,

Today a person asked me for information on a little known Flettner proposal in the US after WW2, so a request was put on PPRuNe to see if anyone knows anything.

It happens to...
Forum: Rotorheads
12th Oct 2012, 22:03
Replies: 9
Views: 2,354
Posted By Dave_Jackson

Seeking information on the Flettner Fl 201 project in 1954

Dual Rotor Powered Autogyro


"Anton Flettner again reappears, now the founder of his own company in New York after the war. The Fl 201 Heligyro, evolving out of his earlier work on the Fl 185,...
Forum: Rotorheads
6th Oct 2012, 22:25
Replies: 201
Views: 61,161
Posted By Dave_Jackson

This might, or might not, be of some interest. ...

This might, or might not, be of some interest. http://www.unicopter.com/NoIdea.gif

Annual Safety Review easa.europa.ex...
Forum: Rotorheads
27th Sep 2012, 09:22
Replies: 201
Views: 61,161
Posted By Dave_Jackson

A new article in Rotor & Wing. Designer of...

A new article in Rotor & Wing.

Designer of Electric Helo Reflects on 2011 Flight Tests...
Forum: Rotorheads
18th Sep 2012, 21:31
Replies: 139
Views: 60,056
Posted By Dave_Jackson

Over the next decade it will be very interesting...

Over the next decade it will be very interesting to watch how the Xcubed and the X2 compete; and what their specific rotor characteristics are.
Forum: Rotorheads
22nd Aug 2012, 18:53
Replies: 56
Views: 13,473
Posted By Dave_Jackson

"Opinions wanted for UAV completely take over the...

"Opinions wanted for UAV completely take over the helicopter in the long term future?"

IMHO, Yes.

And there are a number of very logical reasons for this.


Dave
Forum: Rotorheads
30th Jun 2012, 00:09
Replies: 0
Views: 759
Posted By Dave_Jackson

Smile Generation X rotorcraft

Move over 'X2' and 'Xcube', here comes the 'Xed Off'

A Personal Aerial Vehicle for those with the need for speed, plus VTOL.
A poor-man's version of the Ryan XV-5 Vertifan.

An...
Forum: Rotorheads
25th Jun 2012, 01:03
Replies: 20
Views: 7,015
Posted By Dave_Jackson

When Facts and Marketing come into conflict....

When Facts and Marketing come into conflict. http://www.unicopter.com/RollEyes.gif


Pascal Chretien: PPRuNe posting on 3rd September 2011.
On the 12th of August 2011; World’s First Manned...
Forum: Rotorheads
21st Jun 2012, 20:13
Replies: 56
Views: 12,951
Posted By Dave_Jackson

Lightbulb slowrotor, If you want to go 'green' and...

slowrotor,

If you want to go 'green' and not wait for batteries to improve, then what about considering a very lightweight Genset?

This is an idea that is being played with....
Forum: Rotorheads
21st Jun 2012, 19:29
Replies: 19
Views: 6,666
Posted By Dave_Jackson

Smile For those who want a quadrotor PAV

OTHER: Helicopter - Inside - Quadrotor - Electrotor-SloMo (http://www.unicopter.com/2117.html)


Dave
Forum: Rotorheads
21st Jun 2012, 04:40
Replies: 56
Views: 12,951
Posted By Dave_Jackson

In the May/June 2012 issue of Vertiflite, from...

In the May/June 2012 issue of Vertiflite, from the head of Sikorsky Innovations;

"Our electric helicopter last year just wasn't ready for prime time. We could have done a flight, but it would...
Forum: Rotorheads
22nd Apr 2012, 18:43
Replies: 201
Views: 61,161
Posted By Dave_Jackson

Smile Ian, OK, two rotors can do. But make...

Ian,

OK, two rotors can do.

But make that little wee one bigger, and make it point upwards where it can do some work.

Dave
Forum: Rotorheads
15th Apr 2012, 19:01
Replies: 201
Views: 61,161
Posted By Dave_Jackson

Thumbs up "The First Electric Helicopter' in AHS Vertiflite

There is a 5-page article on Pascal Chretien's electric helicopter in the March-April 2012 issue of the American Helicopter Society's magazine Vertiflite.

On the cover it says 'The First Electric...
Forum: Rotorheads
14th Jan 2012, 19:36
Replies: 1,701
Views: 472,081
Posted By Dave_Jackson

http://images.ibsrv.net/ibsrv/res/src:www.pprune.o...

http://images.ibsrv.net/ibsrv/res/src:www.pprune.org/get/images/infopop/icons/icon14.gif


The obvious problem is that the V-22 is a compromise between the helicopter and the airplane...
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