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Search: Posts Made By: SplineDrive
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Forum: Rotorheads
12th Jun 2021, 19:19
Replies: 323
Views: 105,878
Posted By SplineDrive

The FLRAA program speed requirements have indeed...

The FLRAA program speed requirements have indeed been lowered in addition to lots of other requirements changes over the last year... this doesn't change the fact that SB>1 had a design Vh much...
Forum: Rotorheads
28th May 2021, 20:17
Replies: 323
Views: 105,878
Posted By SplineDrive

Wider fuselage also means more of the rear prop...

Wider fuselage also means more of the rear prop is occluded and not all the airflow entering the prop from the fuselage is going to be very predictable. Perhaps this is part of the speed deficit of...
Forum: Rotorheads
21st May 2021, 19:59
Replies: 323
Views: 105,878
Posted By SplineDrive

Defiant-X definitely has a lower cruise...

Defiant-X definitely has a lower cruise efficiency (L/De) than V-280 but actual fuel consumed also depends on cruise speed and engine SFC, etc. They appear to have been successful in talking down the...
Forum: Rotorheads
12th May 2021, 23:32
Replies: 323
Views: 105,878
Posted By SplineDrive

. Check out Commander Cody’s earlier...

.

Check out Commander Cody’s earlier post[/QUOTE]

And since Sikorsky hasn’t released a rotor diameter, here is a top down photo of SB>1 and an H-60 for visual comparison. There’s a difference...
Forum: Rotorheads
12th May 2021, 00:21
Replies: 323
Views: 105,878
Posted By SplineDrive

“It is fast but that’s it.” Hmm… well, let’s see,...

“It is fast but that’s it.” Hmm… well, let’s see, compared to the V-22, V-280 is smaller, has much lower disk loading, has increased low speed agility (meets the Army requirements for a tactical...
Forum: Rotorheads
21st Apr 2021, 22:38
Replies: 21
Views: 3,803
Posted By SplineDrive

It’s a long video so I’m not sure which minute...

It’s a long video so I’m not sure which minute mark you’re referring to, but I did scrub through and see the cockpit video when the ship was at some ground idle condition with the crew clearly...
Forum: Rotorheads
20th Apr 2021, 18:59
Replies: 21
Views: 3,803
Posted By SplineDrive

Once the rotor is out of a pure hover and has...

Once the rotor is out of a pure hover and has edgewise airflow, there are significant harmonic air loads on each blade. 1 per rev, 2 per rev, 3 per rev and so forth. These forces variously sum or...
Forum: Rotorheads
22nd Mar 2021, 12:12
Replies: 323
Views: 105,878
Posted By SplineDrive

I think the Army sees keeping both V-280 and SB>1...

I think the Army sees keeping both V-280 and SB>1 funded during the current concept development and risk reduction phases as political cover and investment to make sure no one can protest that it...
Forum: Rotorheads
9th Mar 2021, 20:50
Replies: 323
Views: 105,878
Posted By SplineDrive

So, according to FlightRadar24, V-280 (N280BH) is...

So, according to FlightRadar24, V-280 (N280BH) is back in flight status having gone out for flights a couple of times this month. Still nothing on SB>1 (N100FV). Are there even any rumors that...
Forum: Rotorheads
25th Jan 2021, 17:11
Replies: 323
Views: 105,878
Posted By SplineDrive

Looking back at this thread, there were some...

Looking back at this thread, there were some flights between summer (20 hrs) and October (23 hrs), and a few more at the December (26 hrs) articles. None in Jan so far. So it’s not quite as bad as...
Forum: Rotorheads
6th Jan 2021, 12:01
Replies: 323
Views: 105,878
Posted By SplineDrive

Both FLRAA competitors have agility requirements...

Both FLRAA competitors have agility requirements at the LZ similar to the UH-60 platform and the V-280 has demonstrated that capability. It also has the ability to rapidly drop from cruise to LZ and...
Forum: Rotorheads
1st Jan 2021, 13:48
Replies: 323
Views: 105,878
Posted By SplineDrive

Well, I was too optimistic when it came to...

Well, I was too optimistic when it came to predictions of last quarter progress for SB>1. I’m sure they’ll declare success if they ever reach 230 knots, but success should be measured against the...
Forum: Rotorheads
17th Dec 2020, 04:26
Replies: 147
Views: 16,610
Posted By SplineDrive

The R-22 main rotor head has delta-3, which...

The R-22 main rotor head has delta-3, which affects the phase angle between control input and rotor response. There are other factors that affect that angle, but if there is delta-3 involved, that...
Forum: Rotorheads
15th Dec 2020, 18:58
Replies: 147
Views: 16,610
Posted By SplineDrive

Just checked my Dr. Henry Velkoff text, and the...

Just checked my Dr. Henry Velkoff text, and the phenomenon is just as AC described it! 😂
Forum: Rotorheads
27th Nov 2020, 14:48
Replies: 323
Views: 105,878
Posted By SplineDrive

I guess “imminent” is longer than three months.

I guess “imminent” is longer than three months.
Forum: Rotorheads
12th Nov 2020, 16:21
Replies: 34
Views: 7,923
Posted By SplineDrive

This is the clearest explanation and the one I...

This is the clearest explanation and the one I learned. ☺️
Forum: Rotorheads
6th Nov 2020, 14:04
Replies: 20
Views: 2,940
Posted By SplineDrive

The complaint I’ve always heard was not Boeing’s...

The complaint I’ve always heard was not Boeing’s individual engineers and their contributions, but rather how their program managers assigned to the teams managed risk, schedule, mitigations, etc.
Forum: Rotorheads
5th Nov 2020, 15:39
Replies: 20
Views: 2,940
Posted By SplineDrive

Plenty of people remember Comanche... not all...

Plenty of people remember Comanche... not all engineers remember that teaming fondly.
Forum: Rotorheads
4th Nov 2020, 19:02
Replies: 20
Views: 2,940
Posted By SplineDrive

Anecdotally, the opposite was true at Sikorsky...

Anecdotally, the opposite was true at Sikorsky when engineers learned they’d be teaming with Boeing on SB>1.
Forum: Rotorheads
4th Nov 2020, 14:58
Replies: 20
Views: 2,940
Posted By SplineDrive

Oh, I’ve heard a few wistful dreams and...

Oh, I’ve heard a few wistful dreams and “what-ifs” about X-Wing over the years, but I think Sultan is just having fun, though... Sikorsky is “all-in” on X-2 technology. Not a wise strategy, but it is...
Forum: Rotorheads
18th Oct 2020, 23:13
Replies: 323
Views: 105,878
Posted By SplineDrive

Put me down for another press release in...

Put me down for another press release in mid-December highlighting the hundreds of ground turn hours accumulated on the test beds and "thousands" of hours of simulations in various integration labs...
Forum: Rotorheads
18th Oct 2020, 04:14
Replies: 323
Views: 105,878
Posted By SplineDrive

i read 23 hours in one of this week’s articles.

i read 23 hours in one of this week’s articles.
Forum: Rotorheads
17th Oct 2020, 16:33
Replies: 323
Views: 105,878
Posted By SplineDrive

It doesn't and to Lockheed's credit, I don't...

It doesn't and to Lockheed's credit, I don't think they have officially claimed it does, but some journalists have gotten "excited" about the 232 knot value.
Forum: Rotorheads
15th Oct 2020, 17:32
Replies: 323
Views: 105,878
Posted By SplineDrive

I don’t really think the data from press releases...

I don’t really think the data from press releases is sufficient to build any sort of credible speed-power polar, even for trash-talking purposes. The time required to advance another 6 knots is a...
Forum: Rotorheads
30th Sep 2020, 16:55
Replies: 323
Views: 105,878
Posted By SplineDrive

Honestly, other than that Sikorsky press/media...

Honestly, other than that Sikorsky press/media day, I can’t find an official looking requirement for 230 knots. Everything I can find says 250 knots as a threshold speed and 280 knots as objective....
Showing results 1 to 25 of 138
 


 
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