08 Jun 2025, 10:49 [ UTC - 5; DST ]
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Post subject: Cobalt Valkyrie  Posted: 12 Nov 2015, 15:42 |
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Joined: 11/06/13
Posts: 422
Post Likes: +260
Location: KFTW-Fort Worth Meacham
Aircraft: C208B, AL18-115
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http://www.flyingmag.com/aircraft/pisto ... 0-valkyrieNew airplane was announced proving once again that airplane are fastest and cheapest when they are made out of paper. I want new manufacturers to have success, but I am skeptical of the performance claims. Plus, the numbers are for 25k feet in an unpressurized airframe.
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Post subject: Re: Cobalt Valkyrie Posted: 12 Nov 2015, 22:13 |
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Joined: 02/23/14
Posts: 1555
Post Likes: +1326
Location: KCOU
Aircraft: PA-28 / C-182
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It will get fat and shed performance coming to life.
_________________
John Chancellor
PPL ASEL, AGI, IGI
In memory of the victims of the Dictatorship
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Post subject: Re: Cobalt Valkyrie Posted: 12 Nov 2015, 23:02 |
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Joined: 11/08/12
Posts: 12805
Post Likes: +5255
Location: Jackson, MS (KHKS)
Aircraft: 1961 Cessna 172
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Username Protected wrote: How exactly does a mere 350hp get me and 1000# of people or stuff plus full fuel to 260knots in level cruise? Probably a very hot wing with canard to help the stall behavior. That said, a mirage will do 220 on 350hp. 260 at full power might be possible.
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Post subject: Re: Cobalt Valkyrie Posted: 12 Nov 2015, 23:09 |
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Joined: 02/09/11
Posts: 652
Post Likes: +102
Company: Aero Teknic Inc.
Location: CYHU / Montreal St-Hubert
Aircraft: MU-2B-60, SR22,C182Q
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Almost funny. Five years ago the claim was 245 KTS max cruise: http://www.aero-news.net/index.cfm?do=m ... 254af1f5afThe whole huge hinged front bubble canopy thing is completely ridiculous. I can't find a single photo or video showing that it has actually flown. These guys left a trail of broken promises in Canada and split to the US. The talk of a production-conforming example produced stretches credibility. -Pascal
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Post subject: Re: Cobalt Valkyrie Posted: 12 Nov 2015, 23:10 |
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Joined: 12/03/14
Posts: 20290
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Company: Ciholas, Inc
Location: KEHR
Aircraft: C560V
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Username Protected wrote: How exactly does a mere 350hp get me and 1000# of people or stuff plus full fuel to 260knots in level cruise? The brochure airplane can do anything. Mike C.
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Email mikec (at) ciholas.com
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Post subject: Re: Cobalt Valkyrie Posted: 12 Nov 2015, 23:12 |
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Joined: 06/25/10
Posts: 13178
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Company: Summerland Key Airport
Location: FD51
Aircraft: P35, GC1B
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Username Protected wrote: How exactly does a mere 350hp get me and 1000# of people or stuff plus full fuel to 260knots in level cruise? Probably a very hot wing with canard to help the stall behavior. That said, a mirage will do 220 on 350hp. 260 at full power might be possible.
Not a chance in hell.
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Being right too soon is socially unacceptable.
— Heinlein
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Post subject: Re: Cobalt Valkyrie Posted: 12 Nov 2015, 23:16 |
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Joined: 12/10/07
Posts: 8113
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Location: New York, NY
Aircraft: Debonair C33A
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This is really just a glorified Velocity - better looking, I'll grant them that. Velocity will do 250 kts on 310 Hp. But looking on Cobalt web site, one thing that looks weird right away is that it supposedly loses 50kts off the top speed when loaded. It does not make any sense; a Bonanza loses what, 3-4 kts? http://www.cobalt-aircraft.com/valkyrie-x/
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Post subject: Re: Cobalt Valkyrie Posted: 12 Nov 2015, 23:29 |
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Joined: 11/06/10
Posts: 12154
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Company: Looking
Location: Outside Boston, or some hotel somewhere
Aircraft: None
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Username Protected wrote: How exactly does a mere 350hp get me and 1000# of people or stuff plus full fuel to 260knots in level cruise? Probably a very hot wing with canard to help the stall behavior. That said, a mirage will do 220 on 350hp. 260 at full power might be possible.
The Lancair Evo with a 350HP piston engine claimed to get 242KTAS and could hit 270KTAS in mid 20s. Per a Flying article back around 2010.
So it is theoretically possible...
Tim
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Post subject: Re: Cobalt Valkyrie Posted: 15 Nov 2015, 20:01 |
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Joined: 08/10/14
Posts: 1781
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Location: Northwest Arkansas (KVBT)
Aircraft: TBM850
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Username Protected wrote: Velocity will do 250 kts on 310 Hp. But looking on Cobalt web site, one thing that looks weird right away is that it supposedly loses 50kts off the top speed when loaded. It does not make any sense; a Bonanza loses what, 3-4 kts?
Is there any other aircraft on the market that has this kind of performance penalty for carrying a few extra pounds? If these numbers were true, the speed difference between flying with minimum and full fuel would be enormous. Also, the weight examples are not linear but the performance penalty is. That math does not compute.
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Post subject: Re: Cobalt Valkyrie Posted: 15 Nov 2015, 21:13 |
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Joined: 12/03/14
Posts: 20290
Post Likes: +25427
Company: Ciholas, Inc
Location: KEHR
Aircraft: C560V
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Username Protected wrote: That math does not compute. Ah, the beauty of sanity checks. The math is wrong unless there is some other assumption not evident here (like adjusting speed to best efficiency or something like that). For reference (just because I have the POH handy), a 421C speeds up 4 to 6 knots per 1000 pounds weight reduction. Figure a clean single to be about that, maybe a touch more. In other words, light to heavy should be about 10 knots. Mike C.
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