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Author Topic: Bell V-247 armed Tiltrotor drone for the Marines  (Read 5340 times)

Offline fightingirish

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Bell V-247 armed Tiltrotor drone for the Marines
« on: August 29, 2016, 01:48:02 am »
Bell V-247 (or X-247), a new armed tiltrotor drone proposal for the USMC.
Quote
[...]For now, Bell is calling this previously unrevealed tiltrotor the V-247, the numbers standing for the duration the Marines want one or more to be able to stay on station – 24/7. Bell plans to officially reveal the new concept at a Washington news event next month. Larger models of the V-247 are likely to appear at the Sept. 27-30 Modern Day Marine exposition at Quantico Marine Base, Va., and at the Association of the United States Army’s annual conference that begins Oct. 3 in Washington.[...]
Source: http://breakingdefense.com/2016/08/meet-bells-x-247-armed-tiltoror-drone-for-marines/
Slán,
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Offline Flyaway

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Re: Bell V-247 armed Tiltrotor drone for the Marines
« Reply #1 on: August 31, 2016, 10:11:20 am »
Quote
PENTAGON: A sleek little model sits on the desk of Lt. Gen. Jon “Dog” Davis, Marine deputy commandant for aviation. What is that, we asked? The next tiltrotor Bell Helicopter Textron hopes the Marine Corps will buy. But it’s not the V-280 Valor, the new manned tiltrotor Bell plans to fly next year. It’s an unmanned tiltrotor designed to give the Marines a drone that can do everything the Air Force’s armed MQ-9 Reaper does – and more. Especially taking off and landing from ships or from land where there’s no runway.

“I think there is a big need for a UAS that can go aboard the sea base,” Davis told me in an interview last week. “General Neller says he doesn’t need a Reaper, but he needs a Reaper-like capability that can go from the sea base.” Gen. Robert Neller is the Marine Corps commandant.

“This is what Bell is proposing,” Davis says, placing the model of Bell’s new concept on the table. “Single engine. It looks a lot like a V-280, doesn’t it?”

http://breakingdefense.com/2016/08/meet-bells-x-247-armed-tiltoror-drone-for-marines/

Offline fightingirish

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Re: Bell V-247 armed Tiltrotor drone for the Marines
« Reply #2 on: August 31, 2016, 10:28:24 am »
« Last Edit: August 31, 2016, 10:32:24 am by Jemiba »
Slán,
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Offline Moose

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Re: Bell V-247 armed Tiltrotor drone for the Marines
« Reply #3 on: August 31, 2016, 07:09:20 pm »
So a centrally mounted turbine and electric motors in the rotor pods, or a mechanical drivetrain out to the pods? Either way, Interesting
« Last Edit: August 31, 2016, 07:11:59 pm by Moose »

Offline yasotay

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Re: Bell V-247 armed Tiltrotor drone for the Marines
« Reply #4 on: September 01, 2016, 08:36:48 am »
So a centrally mounted turbine and electric motors in the rotor pods, or a mechanical drivetrain out to the pods? Either way, Interesting

I would suspect that Bell is sticking to mechanical linkages as they appear to be a relatively conservative design outfit.  Would be exciting to see them take a step on the wild side.

Offline fightingirish

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« Last Edit: September 22, 2016, 09:50:04 am by fightingirish »
Slán,
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Offline CammNut

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Re: Bell V-247 armed Tiltrotor drone for the Marines
« Reply #6 on: September 22, 2016, 04:50:21 pm »
The V-247 has the same proprotor design as the V-22 and V-280 - gimbaled head with swashplate control

The big difference from the V-280 is the single engine is in the fuselage and drives the rotors via a main gearbox in the center of the wing and shafts that run through the wing to the nacelles. The outer wing sections tilt with the nacelles.

In the V-280, the engines are in fixed nacelles at the tips of the wings and only the gearboxes and proprotors tilt. But both avoid the V-22's problem of tilting the entire drive train. Like the V-22's proprotors, the V-280's are cross-shafted.

Offline CammNut

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Re: Bell V-247 armed Tiltrotor drone for the Marines
« Reply #7 on: September 22, 2016, 04:59:41 pm »
Also, re "armed" - it is, as you would expect, billed as multirole. The V-247 has two side bays and one underfuselage. The side bays can carry fuel, sonobuoys, lidar sensor, or two Hellfire or JAGM missiles. The underfuselage bay can carry a Mk50 torpedo, AIM-9X missile, 360-deg-scan surveillance radar or more fuel.

With a gross weight of 29,500lb, the V-247 can carry 13,000lb of fuel, sensors and/or weapons. It is a big aircraft - 65ft wingspan and 30ft-diameter rotors. The V-280 is not that much heavier at 35,000lb. Bell's proposal for the Army's FVL Capability Set 1 armed scout is also an unmanned tiltrotor, it turns out.

Offline VTOLicious

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Re: Bell V-247 armed Tiltrotor drone for the Marines
« Reply #8 on: September 23, 2016, 04:22:22 am »
"The big difference from the V-280 is the single engine is in the fuselage and drives the rotors via a main gearbox in the center of the wing and shafts that run through the wing to the nacelles. The outer wing sections tilt with the nacelles."

...folding wing with mid-mounted engine?  :o

Offline TomS

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Re: Bell V-247 armed Tiltrotor drone for the Marines
« Reply #9 on: September 23, 2016, 04:43:43 am »
Bell says "blade fold, wing stow."  Judging from the illustrations, I suspect the wing rotates to lie parallel with the fuselage like the V-22.  The dihedral wing segments outboard of the rotor nacelles probably would fold up and in to reduce length overall.  To fit in a DDG-51 hangar, it has to get down to roughly 41 feet length folded.

Edit: Confirmed.

http://breakingdefense.com/2016/09/month-after-us-bell-unveils-v-247-vigilant-tiltrotor-drone/

Quote
The V-247 will be sized to fit on the deck of a guided missile destroyer, Tobin said. By folding its rotor blades and stowing its wing by swiveling it across the top of the fuselage lengthwise, it could fit inside a DDG’s helicopter hangar. On a stand to Tobin’s left as he spoke stood a big 1/8th scale model of the V-247 – far larger than the one we saw on Lt. Gen. Davis’s desk last month – automated to fold its rotor blades and stow its wing to demonstrate shipboard storage. Bell is expected to display the model at the Sept. 27-30 Modern Day Marine exposition at Quantico Marine Base, and at the Association of the United States Army’s annual meetings Oct. 3-5 in Washington.
« Last Edit: September 23, 2016, 04:58:33 am by TomS »

Offline fightingirish

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Re: Bell V-247 armed Tiltrotor drone for the Marines
« Reply #10 on: September 23, 2016, 05:30:06 am »
The model of the Bell Helicopter V-247 shows how the wing rotates and folds its rotor blades.
Link: https://twitter.com/YasminTadjdeh/status/778944178071937025
Slán,
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Slán ist an Irish Gaelic word for Goodbye.  :)

Offline flateric

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Re: Bell V-247 armed Tiltrotor drone for the Marines
« Reply #11 on: September 23, 2016, 06:18:07 am »
...
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stealth, more than a few of them truly technically ignorant and proud of it." Sherm Mullin, Skunk Works

Offline CammNut

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Re: Bell V-247 armed Tiltrotor drone for the Marines
« Reply #12 on: September 23, 2016, 07:43:39 am »
According to Tobin, the engine output drive goes up though the wing pivot to the main gearbox in the center wing. Obviously, therefore, the gearbox and drive shafts pivot with the wing while the engine stays fixed

Offline sferrin

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Re: Bell V-247 armed Tiltrotor drone for the Marines
« Reply #13 on: September 23, 2016, 07:48:50 am »
Also, re "armed" - it is, as you would expect, billed as multirole. The V-247 has two side bays and one underfuselage. The side bays can carry fuel, sonobuoys, lidar sensor, or two Hellfire or JAGM missiles. The underfuselage bay can carry a Mk50 torpedo, AIM-9X missile, 360-deg-scan surveillance radar or more fuel.

Seems pretty light for a 30,000lb aircraft.   You'd think it could carry at least a pair of torpedoes.
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Offline yasotay

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Re: Bell V-247 armed Tiltrotor drone for the Marines
« Reply #14 on: September 23, 2016, 09:38:58 am »