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Search: Posts Made By: etudiant
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Forum: Rotorheads
31st Jul 2019, 14:49
Replies: 488
Views: 209,070
Posted By etudiant

Very much on board with all that. However, it...

Very much on board with all that.
However, it does seem to me that the 525 was cruising to certification when this accident happened. The inquiry has resulted in a material certification delay,...
Forum: Rotorheads
30th Jul 2019, 00:56
Replies: 488
Views: 209,070
Posted By etudiant

If that is so, why has the airframe certification...

If that is so, why has the airframe certification been delayed so much? It seems a pretty extended delay for what you describe as a clear cut pilot error.
Forum: Rotorheads
4th Aug 2017, 02:24
Replies: 488
Views: 209,070
Posted By etudiant

These shapes are highly reminiscent of the...

These shapes are highly reminiscent of the 'hopeless diamond' shape that eventually resulted in the F-117, albeit more evolved. Radar cross section test dummies for some high speed vehicle perhaps?
Forum: Rotorheads
2nd May 2017, 20:57
Replies: 488
Views: 209,070
Posted By etudiant

No argument about the tactics failure, just that...

No argument about the tactics failure, just that tactics need to adjust to reality and that is difficult to determine in exercises. The Army thought it had the answer, they were mistaken. Iirc, over...
Forum: Rotorheads
2nd May 2017, 13:30
Replies: 488
Views: 209,070
Posted By etudiant

The Army accepted that the Apache would not match...

The Army accepted that the Apache would not match the Cheyenne performance. It has not closed the gap since, partly because the design is less capable, partly because weight growth has negated the...
Forum: Rotorheads
2nd May 2017, 00:36
Replies: 488
Views: 209,070
Posted By etudiant

The Cobra was indeed in service at the time, no...

The Cobra was indeed in service at the time, no question. The Cheyenne was to be the clean sheet follow on, faster, more powerful and more capable.
The Apache was launched as a Cheyenne successor...
Forum: Rotorheads
1st May 2017, 22:13
Replies: 488
Views: 209,070
Posted By etudiant

I'm unconvinced about that. The political...

I'm unconvinced about that. The political leadership did support a state of the art high end attack helicopter.
There was a consensus that there was a legitimate requirement, but no confidence that...
Forum: Rotorheads
1st May 2017, 16:33
Replies: 488
Views: 209,070
Posted By etudiant

That may be quite true, but iirc, it was scrapped...

That may be quite true, but iirc, it was scrapped after a fatal accident which involved the crew getting killed by the main rotor blades.
Solving the rotor stability problem proved more difficult...
Forum: Rotorheads
26th Apr 2017, 21:58
Replies: 488
Views: 209,070
Posted By etudiant

Honestly, I have no confidence that the designs...

Honestly, I have no confidence that the designs will scale.
We don't really have a firm grasp even on conventional rotor systems engineering, else we have long since corrected the design flaws that...
Forum: Rotorheads
25th Apr 2017, 21:20
Replies: 488
Views: 209,070
Posted By etudiant

See no reason to dismiss option A The pool of...

See no reason to dismiss option A
The pool of aerodynamics expertise is pretty shallow and the number of people really conversant with coaxial rotors is single digit at best. Factor in a huge scale...
Forum: Rotorheads
23rd Apr 2017, 22:40
Replies: 488
Views: 209,070
Posted By etudiant

I don't think there is an advanced technology...

I don't think there is an advanced technology rotor craft without cringe worthy weaknesses. So it is pointless to harp on the various failures, there have been lots, widely distributed.
The issue...
Forum: Rotorheads
21st Apr 2017, 16:08
Replies: 488
Views: 209,070
Posted By etudiant

Fancy management techniques and flashy videos are...

Fancy management techniques and flashy videos are very effective tools for marketing, but are no substitute for hard nosed engineering assessments.
Unfortunately, the evidence suggests that in...
Forum: Rotorheads
19th Apr 2017, 22:01
Replies: 488
Views: 209,070
Posted By etudiant

The schedule is pretty flexible, as this is a...

The schedule is pretty flexible, as this is a long term fleet renewal oriented development.
So I think taking time up from to make the right decisions is very appropriate. Costs are largely...
Forum: Rotorheads
18th Apr 2017, 23:26
Replies: 488
Views: 209,070
Posted By etudiant

Can anyone more familiar with the situation...

Can anyone more familiar with the situation clarify whether this video shows additional flights or is it a creative montage of images from the initial flight?
I've heard nothing about any additional...
Showing results 1 to 14 of 14


 
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