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The Defiant reminds me of Kamov's designs, and bringhts out a doubt I've had: because of the 2-rotor mast, how much taller is the heli? That could bring problems related to geting them aboard ships, or storing them in small hangars that fit today's copters...
It's a fixed hub. The Kamov designs are much taller.
Here's a mockup of the S-97 next to some people for scale:
[QUOTE=Operator;979996]The US Army is looking to eventually upgrade it's Blackhawk fleet and the Bell V280 Valor and Sikorsky/Boeing Defiant are the two competitors. With a quick look at the two, it seems like the V280 would be the more ideal choice. It's still early and little is known about the Defiant but I could see Bell getting the utility copter deal and the Sikorsky S-97 Raider receiving the attack helo deal.
What happens if you lose an engine? In forward flight those look like big engines and very high wing loading and a v-tail. Other than a French trainer never saw a v tail twin,or for anti torque on a helicopter. I am sure they have answer, just curious to what it is?
It's probably basically the same as an Osprey; there's a connection between the transmissions to keep both rotors going. If you're asking about flight characteristics, I still think it's going to be related to however the Osprey reacts.
It's probably basically the same as an Osprey; there's a connection between the transmissions to keep both rotors going. If you're asking about flight characteristics, I still think it's going to be related to however the Osprey reacts.
I'm lazy, and should look this up, but on the tilt rotors you never feather, and pray the transmission never fails?
That's my impression from chatting with an Osprey pilot on another message board I sometimes use...if I could remember who it was I could ask. Unfortunately...
But if the transmission fails on a normal helicopter you're also boned. Maybe you can survive through autorotation but does that still work "normally" on a twin rotor like a 46 or Chinook?
Helicopters make virtually zero sense to me. The more I learn the less I understand.
15 October 2021 Walkaround of Sikorsky’s Raider X Compound Helicopter for US Army's FARA Contract at AUSA 21
Bill Fell, the principle test pilot at Lockheed Martin’s Sikorsky unit, with a walkaround of the company’s Raider X compound helicopter at the Association of the United States Army’s 2021 conference and tradeshow in Washington, DC. The novel aircraft, with two coaxial rotor blades and a single pusher propeller, is competing for the US Army’s Future Armed Reconnaissance Aircraft contract.
30 November 2021 Bell V-280 Valor Demonstration Flight
Bell’s V-280 Valor on its second to last demonstration flight on April 15, 2021, at the company’s Flight Research Center in Arlington, Texas. After one more flight in late April, the aircraft was withdrawn from flight testing and torn down to determine wear and tear on the prototype that flew 214 hours and achieved a top speed of 305 knots — 350 mph. The aircraft, which is competing for the US Army’s Future Long-Range Assault Aircraft competition, first flew in December 2017.
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Originally posted by Defense_and_Aerospace_Report
20 July 2020 Bell's Snyder on V-280 Valor, Cutting Costs, Model-Based Design, 505 Helicopter
Mitch Snyder, CEO of Bell, a Textron company, discusses V-280 Valor tiltrotor development testing, showing the US Army why changing its mission approach to accommodate tiltrotors can be worthwhile, cost-cutting strategy, model-based design and continuous innovation, materials costs, ramping up Bell 505 Jet Ranger X commercial light helicopter deliveries, market projections, concerns over a transatlantic trade rift and much more during a wide-ranging, July 18, 2018, interview with Defense & Aerospace Report Editor Vago Muradian at the Farnborough International Airshow outside London. Our coverage is sponsored by Farnborough International and Leonardo DRS. Bell sponsors our weekly Defense & Aerospace Business Report podcast.
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