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Search: Posts Made By: Dave Jackson
Showing results 1 to 35 of 451
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Forum: Rotorheads
22nd Mar 2003, 18:08
Replies: 5
Views: 1,102
Posted By Dave Jackson

Thoughts and condolences go to the families of...

Thoughts and condolences go to the families of all those who have died, or are about to die; irrespective of whether they are the aggressor or the aggrieved.
Forum: Rotorheads
17th Mar 2003, 23:39
Replies: 14
Views: 1,166
Posted By Dave Jackson

The following are two excerpts from the...

The following are two excerpts from the statements to the HASC Hearing.
IMHO they convey two surpassingly different attitudes towards the future of rotorcraft.


Boeing:

" ... the critical...
Forum: Rotorheads
9th Mar 2003, 22:11
Replies: 0
Views: 616
Posted By Dave Jackson

Unhappy Topical topics

IMHO the current global conflict is far from being 'off-topic'. Most would say that it is the world's most topical subject.

Passionate discussions amongst peoples are a far superior solution then...
Forum: Rotorheads
9th Mar 2003, 20:15
Replies: 14
Views: 1,918
Posted By Dave Jackson

Devil Hi Heliport; I agree that many of the posts...

Hi Heliport;

I agree that many of the posts had moved off topic.

But, lest anyone get the wrong impression, my post that you have quoted, started with 'the little red devel'. It was a...
Forum: Rotorheads
9th Mar 2003, 19:55
Replies: 62
Views: 14,351
Posted By Dave Jackson

Perhaps the tilt rotor will be a part of the...

Perhaps the tilt rotor will be a part of the future.

Sikorsky has a number of patents on a 'Variable Diameter Disk', for use on a tilt-rotor configuration of aircraft. :D
Forum: Rotorheads
9th Mar 2003, 07:10
Replies: 13
Views: 1,770
Posted By Dave Jackson

Personally, I don't think the compound...

Personally, I don't think the compound configuration is the answer. It seems inefficient to have the weight and drag of the wings during hover and then the drag of the rotor during fast forward...
Forum: Rotorheads
2nd Mar 2003, 00:42
Replies: 82
Views: 12,153
Posted By Dave Jackson

Delta Julliet Golf I agree with the intent...

Delta Julliet Golf

I agree with the intent of your post, but politely disagrees with your second paragraph.

"All the precautions nowadays are just to make the civilians feel "safe", nothing...
Forum: Rotorheads
28th Feb 2003, 20:43
Replies: 82
Views: 12,153
Posted By Dave Jackson

Unhappy Perhaps the best way of stopping Britain from...

Perhaps the best way of stopping Britain from becoming a 'fortress under siege' is for Blair to stop provoking retaliation from those who have never previously been a threat.

Nationalism is good...
Forum: Rotorheads
16th Feb 2003, 19:29
Replies: 14
Views: 4,755
Posted By Dave Jackson

Devil Lu, Are you subtly suggesting that the...

Lu,

Are you subtly suggesting that the participants on this forum, which share a common language, can have the occasional misunderstanding? :D

:ok: Viva L'Irak libre. :ok: ` . ` . ...
Forum: Rotorheads
15th Feb 2003, 23:26
Replies: 14
Views: 4,755
Posted By Dave Jackson

The blades must have flexed.

Hi Lu:

A small (unnamed) manufacture of homebuilt helicopters developed a UAV using these blades. They did not want to pay for the extruded spar, which goes inside, so they inserted brass bars...
Forum: Rotorheads
15th Feb 2003, 20:05
Replies: 14
Views: 4,755
Posted By Dave Jackson

Jez If there's no intention to get out of...

Jez

If there's no intention to get out of 'Ground Contact' :D, you might like to glance at Vortech (http://www.prismz.com/blades/index.html)
Forum: Rotorheads
9th Feb 2003, 01:32
Replies: 2
Views: 1,113
Posted By Dave Jackson

Barred

Old Man Rotor,

The registered members 'bar' specific threads.
The moderators 'bar' specific registered members.


Moderators,

:D Just joking :D ~ but it was toooo tempting to pass up.
Forum: Rotorheads
30th Jan 2003, 17:25
Replies: 0
Views: 1,927
Posted By Dave Jackson

Turbine Helicycle

Helicycle is going with the T-62-T32 Solar turbine engine. They have taken delivery of about 50 used ones, which they will inspect and partially rebuild. There's an article on this in the Feb/03...
Forum: Rotorheads
30th Jan 2003, 17:21
Replies: 74
Views: 26,414
Posted By Dave Jackson

"....just don't attempt a passenger change while...

"....just don't attempt a passenger change while the rotors are turning."

Sounds a little like the Helicycle. In the earlier model, the rotor was engaged by the pilot standing outside the craft....
Forum: Rotorheads
17th Jan 2003, 17:50
Replies: 37
Views: 4,217
Posted By Dave Jackson

Perhaps the best defense against terrorism is to...

Perhaps the best defense against terrorism is to reduce the manifold pressure of the 'provoker'. :(

IMHO
Forum: Rotorheads
13th Jan 2003, 04:59
Replies: 14
Views: 1,774
Posted By Dave Jackson

"It is one more reason why teetering rotors are...

"It is one more reason why teetering rotors are no longer used when a choice is possible."

Perhaps PPRuNe's very own [2, 3 and 4-blade teetering rotor w/ offset] may, eventually, reinvigorate...
Forum: Rotorheads
2nd Jan 2003, 21:20
Replies: 151
Views: 15,628
Posted By Dave Jackson

Angle of Attack and Angle of Collective Pitch

Perhaps we are all envisioning the same thing, but in a different way.

Nick said; "The pressure below the helicopter IGE is the same as the pressure below the helicopter OGE."

Assuming that the...
Forum: Rotorheads
26th Dec 2002, 06:32
Replies: 151
Views: 15,628
Posted By Dave Jackson

Nick, This thread was initially about...

Nick,

This thread was initially about 'Autorotation and Ground-Effect'. As part of this discussion, the 'effects' of the ground were considered. This thread then moved on to consider the 'causes'...
Forum: Rotorheads
25th Dec 2002, 19:01
Replies: 151
Views: 15,628
Posted By Dave Jackson

The pressure is on.

Flight ~ and Daniel Bernoulli (http://www.rod.beavon.clara.net/flight.htm)
Forum: Rotorheads
24th Dec 2002, 22:49
Replies: 151
Views: 15,628
Posted By Dave Jackson

Nick, You are against using the concept of...

Nick,

You are against using the concept of 'pressure' in the discussion of ground effect. But, you have previously commented that the activity under discussion takes place at the speed of sound. ...
Forum: Rotorheads
21st Dec 2002, 05:50
Replies: 43
Views: 11,662
Posted By Dave Jackson

It starts with a dream. (perhaps it ends as a nightmare. :)

The currently designed rotor (sketch D) will offer better control but it will also exhibit vibration at large displacements of the cyclic stick, when the tip path plane is not parallel to the rotor...
Forum: Rotorheads
19th Dec 2002, 23:20
Replies: 60
Views: 6,159
Posted By Dave Jackson

Talking A Christmas drink...

A Christmas drink (http://www.unicopter.com/temporary/Xmas_drink.SHS) from Canada, to all Rotorheads.

Please use the 'modified' night vision goggles to fully appreciate the table service. :D
...
Forum: Rotorheads
19th Dec 2002, 18:50
Replies: 1,505
Views: 564,581
Posted By Dave Jackson

Is the Brantly B-2B (http://www.brantly.com)...

Is the Brantly B-2B (http://www.brantly.com) acceptable for use as a training helicopter?
Forum: Rotorheads
18th Dec 2002, 19:45
Replies: 1,505
Views: 564,581
Posted By Dave Jackson

Lu, Are you suggesting that the Ford...

Lu,

Are you suggesting that the Ford Explorer is a dangerous craft? :D
Forum: Rotorheads
17th Dec 2002, 20:32
Replies: 1,505
Views: 564,581
Posted By Dave Jackson

Totally irrelevant trivia;

Companies that manufacture certified helicopters, such as Robinson, install expensive reliable 4-stroke engines and then derate them. This is in total contrast to the manufactures of uncertified...
Forum: Rotorheads
17th Dec 2002, 20:18
Replies: 43
Views: 11,662
Posted By Dave Jackson

vorticey, Delta-3 on a main rotor, such as...

vorticey,

Delta-3 on a main rotor, such as the Robinson's, only pulls out a small percentage of the pitch that was input from the cyclic stick. I think that it is designed this way to make light...
Forum: Rotorheads
16th Dec 2002, 23:28
Replies: 43
Views: 11,662
Posted By Dave Jackson

vorticey, We may be going too far into a...

vorticey,

We may be going too far into a complex subject, but here is some more info.

"head plane = yoke plane in your mind"

Just the opposite. The 'head plane' is not the 'yoke plane'. ...
Forum: Rotorheads
14th Dec 2002, 20:07
Replies: 43
Views: 11,662
Posted By Dave Jackson

rwm, Everything that you said is extremely...

rwm,

Everything that you said is extremely valid.

A possible, or partial, solution may be to combine the power train, rotor hubs and flight controls in a single compact package. This...
Forum: Rotorheads
13th Dec 2002, 19:18
Replies: 380
Views: 106,826
Posted By Dave Jackson

Another two cents

An article in a knowledgeable rotorcraft publication suggests that the current fighter aircraft under development, such as the F-22 Raptor, the RAH-66 Comanche and the Tiger may be the last manned...
Forum: Rotorheads
12th Dec 2002, 19:32
Replies: 380
Views: 106,826
Posted By Dave Jackson

Trivia, ~ copied from article on the intermeshing...

Trivia, ~ copied from article on the intermeshing helicopter;

"It was exceptionally steady and stable in flight, which made pilot training a breeze. In fact, this is why the Navy ordered them in...
Forum: Rotorheads
12th Dec 2002, 19:20
Replies: 43
Views: 11,662
Posted By Dave Jackson

vorticey, "how can you say there's no head...

vorticey,

"how can you say there's no head plane?

It's easy to say. :eek: Just tell a white lie. :)
Seriously, I only said that "I can't recall ever seeing a reference to 'rotor head plane'....
Forum: Rotorheads
12th Dec 2002, 06:58
Replies: 43
Views: 11,662
Posted By Dave Jackson

GLSNightPilot You may well be correct, since...

GLSNightPilot

You may well be correct, since I am only working with theory. Stability and control can be at opposite ends of the spectrum, but I am hoping that a 'rotor hub offset' will reduce...
Forum: Rotorheads
11th Dec 2002, 21:37
Replies: 43
Views: 11,662
Posted By Dave Jackson

vorticey "coning angle reduces thrust. by...

vorticey

"coning angle reduces thrust. by pushing the inside of the blade down (the elbow) coning is increased. "

I don't think that the offset will change the coning angle much from that of a...
Forum: Rotorheads
11th Dec 2002, 00:46
Replies: 43
Views: 11,662
Posted By Dave Jackson

vorticey, I don't fully understand your...

vorticey,

I don't fully understand your concerns.

If the mean coning angle is greater, then the blades' center of mass (etc.) will be higher. This means that the pre-cone angle should be...
Forum: Rotorheads
10th Dec 2002, 05:26
Replies: 43
Views: 11,662
Posted By Dave Jackson

Hi Shawn, a) ~ A 2-blade articulated rotor...

Hi Shawn,

a) ~ A 2-blade articulated rotor is probably going to experiences 2P vibration at advanced cyclic positions. The idea in this thread has a similar objective as Bell's 'hub spring', and...
Showing results 1 to 35 of 451
 
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