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Search: Posts Made By: SplineDrive
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Forum: Rotorheads
16th Oct 2019, 12:23
Replies: 91
Views: 41,063
Posted By SplineDrive

[/left] And no commitment to reach the SB>1...

[/left]
And no commitment to reach the SB>1 design speed at all.
Forum: Rotorheads
16th Oct 2019, 00:13
Replies: 12
Views: 807
Posted By SplineDrive

Yes, there are more requirements than can all be...

Yes, there are more requirements than can all be met by a real aircraft, so the Army will have to evaluate each competitors performance and capability trade offs. Also, I doubt Raider-X can cruise at...
Forum: Rotorheads
15th Oct 2019, 22:51
Replies: 12
Views: 807
Posted By SplineDrive

Speed isnít the only metric to get credit on...

Speed isnít the only metric to get credit on...
Forum: Rotorheads
15th Oct 2019, 14:42
Replies: 12
Views: 807
Posted By SplineDrive

True, but adding more power to Raider-X will...

True, but adding more power to Raider-X will increase the top end speed and that appears to be what Sikorsky is selling, and theyíre right in a way. With additional installed power, Raider-X can...
Forum: Rotorheads
15th Oct 2019, 03:32
Replies: 12
Views: 807
Posted By SplineDrive

That’s needlessly harsh... if they didn’t want us...

That’s needlessly harsh... if they didn’t want us to think of S-97 Raider, their FARA CP wouldn’t be named Raider-X with a video full of Raider flight clips. That said, it’s still too many rotors and...
Forum: Rotorheads
14th Oct 2019, 23:11
Replies: 9
Views: 1,300
Posted By SplineDrive

Right. The cosine term goes to anti-torque and...

Right. The cosine term goes to anti-torque and the sine term to aircraft lift, which isnít quite how your text read. For a very small increase in power required for anti-torque, a significant amount...
Forum: Rotorheads
2nd Oct 2019, 00:10
Replies: 114
Views: 62,627
Posted By SplineDrive

in his defense, Defiant hasnít publicly done...

in his defense, Defiant hasnít publicly done anything in half a year... so nothing new to crap on.
Forum: Rotorheads
22nd Sep 2019, 15:48
Replies: 91
Views: 41,063
Posted By SplineDrive

The requirements, of course, are key. If the...

The requirements, of course, are key. If the Marines want something too different than either FARA or FLRAA, the industry is looking at yet another rapid development program of an advanced VTOL...
Forum: Rotorheads
9th Sep 2019, 04:25
Replies: 91
Views: 41,063
Posted By SplineDrive

The facility isnít close enough to the ocean for...

The facility isnít close enough to the ocean for a storm surge to cause a loss, but high winds and a hanger door left open could generate an insurance check... not a great return on investment but...
Forum: Rotorheads
21st Aug 2019, 21:08
Replies: 91
Views: 41,063
Posted By SplineDrive

Perhaps the prop hasnít been engaged to full...

Perhaps the prop hasnít been engaged to full power yet... when it does, youíll hear that beast in the next state 🤣
Forum: Rotorheads
4th Aug 2019, 14:27
Replies: 447
Views: 150,004
Posted By SplineDrive

Iíve got those reports on the S-67 somewhere, I...

Iíve got those reports on the S-67 somewhere, I recall theyíre for the Army. Theyíre on one of the .mil data servers.
Forum: Rotorheads
1st Aug 2019, 04:08
Replies: 447
Views: 150,004
Posted By SplineDrive

A compounded RAH-66 would have a wing to help...

A compounded RAH-66 would have a wing to help offload the rotor as mu increases... that alone should enable the extra speed for FARA with a usable payload. At 180 knots, it wouldnít need a pusher. I...
Forum: Rotorheads
28th Jul 2019, 14:58
Replies: 447
Views: 150,004
Posted By SplineDrive

I would classify it as an excellent teaching tool...

I would classify it as an excellent teaching tool for new HQ, control law, dynamics, and aerodynamics engineers 😉
Forum: Rotorheads
25th Jul 2019, 15:52
Replies: 447
Views: 150,004
Posted By SplineDrive

This one is easy... believe the NTSB.

This one is easy... believe the NTSB.
Forum: Rotorheads
26th Jun 2019, 12:07
Replies: 447
Views: 150,004
Posted By SplineDrive

An article a while back had the comment from the...

An article a while back had the comment from the Army stating something to the effect of ďthe Army knows quite a bit about the rigid coaxial configurationĒ... that may not be a good thing for...
Forum: Rotorheads
22nd Apr 2019, 21:15
Replies: 91
Views: 41,063
Posted By SplineDrive

Yup. I’m sure cribbing S-97 line drawings...

Yup. I’m sure cribbing S-97 line drawings generated some laughter at Bell.
Forum: Rotorheads
21st Apr 2019, 23:36
Replies: 91
Views: 41,063
Posted By SplineDrive

There is far more to a full flight spectrum than...

There is far more to a full flight spectrum than straight and level flight, even high speed flight, nor is it a forgone conclusion that high speed flight is the worst regime from a vibration control...
Forum: Rotorheads
19th Apr 2019, 22:56
Replies: 91
Views: 41,063
Posted By SplineDrive

Right, I'm speaking from a "first principles"...

Right, I'm speaking from a "first principles" textbook point of view, the full problem is certainly more complex, but unlikely in a positive way. Question is, can that AVC clean up the vibes to a...
Forum: Rotorheads
19th Apr 2019, 21:40
Replies: 91
Views: 41,063
Posted By SplineDrive

What the Army may well know is that a flatwise...

What the Army may well know is that a flatwise rigid rotor will have very significant levels of vibratory hub moments and vertical shears unless the number of blades +/- 1 is higher than any...
Forum: Rotorheads
23rd Mar 2019, 16:47
Replies: 91
Views: 41,063
Posted By SplineDrive

I'm with you... worked for several OEMs and...

I'm with you... worked for several OEMs and closely with engineers from all three large US OEMs and some non-US helo OEMs. My primary takeaway from my career is all vertical take off aircraft are...
Forum: Rotorheads
1st Feb 2019, 01:29
Replies: 13
Views: 4,351
Posted By SplineDrive

Hats off to the Bell team, definitely. I do laugh...

Hats off to the Bell team, definitely. I do laugh when anyone suggests a partnership of equals like Boeing and Sikorsky (or Boeing and Bell, for that matter) accelerates anything. I’ve worked in such...
Forum: Rotorheads
26th Dec 2018, 18:18
Replies: 57
Views: 13,773
Posted By SplineDrive

Lockheed provided a better view of the back in...

Lockheed provided a better view of the back in the press kit, too...

https://cimg9.ibsrv.net/gimg/pprune.org-vbulletin/2000x1333/1_3100a15118cf8f555d486b1ef4e9a181c9271721.jpeg

The landing gear...
Forum: Rotorheads
26th Dec 2018, 14:28
Replies: 57
Views: 13,773
Posted By SplineDrive

... and Sikorsky/Boeing have been a year behind...

... and Sikorsky/Boeing have been a year behind Bell for years on the JMR project. They're just now showing photos of SB>1 on the tarmac.
...
Forum: Rotorheads
22nd Oct 2018, 18:36
Replies: 49
Views: 9,740
Posted By SplineDrive

Last time I was in the sim it had a more...

Last time I was in the sim it had a more traditional collective, not the V-22 setup. I assume it hasnít been changed during AWís ownership of the program, but I suppose thatís possible.
Forum: Rotorheads
11th Oct 2018, 03:55
Replies: 57
Views: 13,773
Posted By SplineDrive

My experience with automated fiber placement is...

My experience with automated fiber placement is such that I would not recommend it for a one off aircraft. Rather, design the blade so that it can be automated, but hand make the demonstrator. The...
Showing results 1 to 25 of 78
 


 
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