• Hi Guest! Forum rules have been updated. All users please read here.

Bell X-22A ducted-propellor VTOL

Jemiba

CLEARANCE: Above Top Secret
Staff member
Top Contributor
Senior Member
Joined
Mar 11, 2006
Messages
8,077
Reaction score
410
SAustin16 said:
... The ducted fans could not auto-rotate. The pilot had no "Plan B".

That's right, but that's imminent to more or less ALL designs with ducted fans, like, for example,
the Nord 500 and derivatives, or several Hiller designs and, at least for take-off and landing for
the Coleopters, too. AFAIK, all those designs were multi-engined and the fans were driven via
cross-coupled shafts, so at least the failue of an engine, not necessarily had fatal results. The
failure of the gear box, or a fan of course would have, but if you look at the helicopter, it's more
or less the same, I think, with regards to safety.
 

Mark Nankivil

CLEARANCE: Top Secret
Top Contributor
Senior Member
Joined
Jun 13, 2007
Messages
1,559
Reaction score
226

Jemiba

CLEARANCE: Above Top Secret
Staff member
Top Contributor
Senior Member
Joined
Mar 11, 2006
Messages
8,077
Reaction score
410
From "Der Flieger", January 1964, two quite blurry pictures (due to the small size),
one showing it in the well known form, taking off from a carrier, the other with
a solid nosed ASW version (fitted with a MAD sting ?).
 

Attachments

Grey Havoc

The path not taken.
Senior Member
Joined
Oct 9, 2009
Messages
9,712
Reaction score
506
http://www.dtic.mil/dtic/tr/fulltext/u2/a104137.pdf
 

Michel Van

CLEARANCE: Top Secret
Senior Member
Joined
Aug 13, 2007
Messages
4,316
Reaction score
177
Why was X-22 never taken as TRI-VTOL aircraft ?
Was there unsolvable technical problem ?
or was X-22 victim of many R&D program, concept proved X-project ends ?
 

Jemiba

CLEARANCE: Above Top Secret
Staff member
Top Contributor
Senior Member
Joined
Mar 11, 2006
Messages
8,077
Reaction score
410
Michel Van said:
Why was X-22 never taken as TRI-VTOL aircraft ?
AFAIK, at least the second prototype was tested by all three armed service branches.
 

Tailspin Turtle

CLEARANCE: Top Secret
Senior Member
Joined
Dec 6, 2007
Messages
691
Reaction score
27
Website
www.tommythomason.com
Michel Van said:
Why was X-22 never taken as TRI-VTOL aircraft ?
Was there unsolvable technical problem ?
or was X-22 victim of many R&D program, concept proved X-project ends ?
Vought won the Tri-Service competition for a five-aircraft prototype program with the XC-142 but the Navy thought that Bell's ducted-fan concept might better suit its mission requirements, which resulted in the X-22 program. Similarly, the Air Force separately funded the Curtiss-Wright X-19. Both were subscale demonstrators as opposed to the operationally sized XC-142. Depending on who is telling the story, all the programs disappointed from a performance standpoint or the Vietnam War began to suck funds from experimental and development programs with longer term potential. However, the fact that the only operational VTOL aircraft (Harrier/F-35B and V-22) are not too far from the extremes of disc-loading (pure jet versus conventional helicopter) suggests that the tilt wing, ducted propeller, tilt-propeller, etc. concepts that fall in the middle of the disc-loading range are not fast or cruise-efficient enough to offset their lack of hover efficiency/capability.
 

Mark Nankivil

CLEARANCE: Top Secret
Top Contributor
Senior Member
Joined
Jun 13, 2007
Messages
1,559
Reaction score
226
Good Day All -

Courtesy of the Gerald Balzer Collection, a better scan of the Flight International cutaway. I have some X-22A photos yet to scan and will post those later.

Enjoy the Day! Mark
 

Attachments

GTX

All hail the God of Frustration!!!
Senior Member
Joined
Apr 15, 2006
Messages
2,711
Reaction score
75
Website
beyondthesprues.com
Thanks Mark - one of my favourite aircraft! Looking forward to the photos.
 

Mark Nankivil

CLEARANCE: Top Secret
Top Contributor
Senior Member
Joined
Jun 13, 2007
Messages
1,559
Reaction score
226
Good Day All -

Here are the photos, courtesy of the Gerald Balzer Collection.

Note the first two are of BuNO 151521, all others are of 151520. I would assume 151520 flew first but was damaged in a hard landing after a double hydraulic failure and was not rebuilt. 151521 flew the majority of the test program.

Enjoy the Day! Mark
 

Attachments

sferrin

CLEARANCE: Above Top Secret
Senior Member
Joined
Jun 3, 2011
Messages
12,511
Reaction score
574
GTX said:
Thanks Mark - one of my favourite aircraft! Looking forward to the photos.
x2. I wonder how a configuration like this would perform on the FPV racing scene. :)
 

VTOLicious

CLEARANCE: Top Secret
Joined
Nov 24, 2008
Messages
553
Reaction score
107
Thx for sharing those great pictures!

Here is an article from the AW-archives:

BR Michael
 

Attachments

yasotay

CLEARANCE: Top Secret
Senior Member
Joined
Oct 19, 2006
Messages
2,075
Reaction score
170
My thanks as well for the wonderful pictures of one of my all time favorite aircraft.
 

overscan

Administrator
Staff member
Joined
Dec 27, 2005
Messages
11,720
Reaction score
1,442
Thanks to Mark Nankivil, a report on the X-22A.

http://www.secretprojects.co.uk/X-22AReport.pdf
 
Top