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Sikorsky SB-1 flies for first time

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Sikorsky SB-1 flies for first time

Old 7th May 2019, 14:01
  #61 (permalink)  
 
Join Date: Aug 2009
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Originally Posted by PAXboy
the Osprey is not a runaway success
Actually, it is quite successful and doing well. I invite you to check the calendar. The year is 2019, not 1999. They've gotten through that rough bit (which had some dark times) about introducing new tech. I also suggest you look at V-280 Valor and think about how the future looks for tilt rotor. (Looks pretty good ...)

The coaxial rotor design concept isn't all that new. Kamov had two maritime helicopters that were serviceable (Helix/Hormone) but the trick they are going for in SB1 is to add the high speed flight end of the game to that basic idea. As noted above, that was tried 40 years ago with varying issues arising.
With a lot of new tech available, they can try again with greater hopes for success. They are also doing the crawl, walk, run thing: X2, S-97, now SB1.
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Old 7th May 2019, 14:28
  #62 (permalink)  
 
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Pax,

Marines continue to set the pace.

US Marine Corps (USMC) Lieutenant General Steven Rudder, deputy commandant for aviation, is confident that a tiltrotor can meet the service’s minimum cruise speed goal of 270kt (500km/h) for its Future Long Range Assault Aircraft (FLRAA).

The USMC plans to piggyback on the US Army-run FLRAA programme, though it wants a next-generation utility rotorcraft with even more capability than the US Army is asking, in particular the ability to cruise at least 270kt, which is the cruise speed of the Bell Boeing V-22.
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Old 10th Jun 2019, 13:14
  #63 (permalink)  
CTR
 
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Coming Up on Three Months Since First Flight

Almost three months have past since the Defiantís First Flight. Any flight test updates? Not unusual for a new aircraft to be down for a month following First Flight. But three months?
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Old 12th Jun 2019, 14:34
  #64 (permalink)  
 
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Originally Posted by CTR View Post
Almost three months have past since the Defiantís First Flight. Any flight test updates? Not unusual for a new aircraft to be down for a month following First Flight. But three months?
As with Raider, flight test is progressing glacially. As of a couple weeks ago, supposedly SB-1 had completed its 3rd flight , hovering to 150 ft and 10 kts air taxi.

Raider has actually been flying since mid last year, demoing in secret at the request of the Army while also testing numerous desperate attempts to fix its gargantuan vibration issues. SB1 may be going down the same path as it (amazingly) did not incorporate many lessons learned from S-97.
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Old 12th Jun 2019, 18:10
  #65 (permalink)  
 
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Have to wonder, is there a plan B for Lockheed/ Sikorsky? If the coax rotor does not scale as expected, what is their fallback?
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Old 12th Jun 2019, 19:21
  #66 (permalink)  
 
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Originally Posted by etudiant View Post
Have to wonder, is there a plan B for Lockheed/ Sikorsky? If the coax rotor does not scale as expected, what is their fallback?
I would imagine a much more vocal propaganda push about how ITEP will make UH-60 and AH-64 perfectly suitable moving forward, and that FVL is an expensive wholly unnecessary endeavour.
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Old 13th Jun 2019, 02:08
  #67 (permalink)  
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Originally Posted by etudiant View Post
Have to wonder, is there a plan B for Lockheed/ Sikorsky? If the coax rotor does not scale as expected, what is their fallback?
Make Textron a impossible to turn down offer for Bell. Before Boeing beats them to it.
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Old 16th Jun 2019, 21:32
  #68 (permalink)  
 
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From FG:

The compound co-axial rotor design flew for the first time in March, and has since made just two additional sorties, putting it well behind the rival Bell V-280 tiltrotor, which took to the air in December 2017.
From Sikorsky:

"We were hoping that we would be flying more," says Dan Schultz, president of Sikorsky.

Initial delays were caused by a third party that is producing a gearbox component, and the airframer is now working to catch up on the schedule slip.

Controls, transmission and rotor design have been validated by the flights so far, says Schultz, with "minimal vibration" detected.
So only three flights in three months confirmed. Appears they havenít done anything beyond hover and very low speed. If this is the case nothing of the design has been validated and the vibration claim is no better than saying it is smooth while being towed. These kind of statements are the type made trying to keep LM from pulling the plug on funding. (Remember LM is on the V-280 where they have already seen the full capabilities of the aircraft and their products demonstrated to a timeline set back in 2015.)



Last edited by The Sultan; 16th Jun 2019 at 21:44.
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