A previously undisclosed, classified stealth helicopter apparently was
part of the U.S. task force that killed Osama bin Laden in Pakistan on May 1.
The exact type of helicopter is unknown but it appears to be a highly
modified version of an H-60 Blackhawk. Photos disseminated via the European
PressPhoto agency and attributed to an anonymous stringer show that the
helicopter's tail features stealth-configured shapes on the boom and the tail
rotor hub fairings, swept stabilizers and a "dishpan" cover over a
five-or-six-blade tail rotor. It has a silver-loaded infrared suppression finish
similar to that seen on V-22s.
The aircraft was damaged during the mission and abandoned. The mission
team destroyed most of the airframe but its tail section landed outside the
wall of the target compound and escaped demolition.
Stealth helicopter technology is not new and was applied extensively to
the Boeing/Sikorsky RAH-66 Comanche, cancelled in 2004. Compared with
fixed-wing stealth, more emphasis is usually placed on noise and infrared
signatures.
Noise can be reduced and made less conspicuous by adding blades to the
main and tail rotors. It can also be reduced by aerodynamic modifications and
flight control changes that make it possible to reduce rotor rpm,
particularly in forward flight below maximum speed. Infrared reduction measures are
crucial - the Comanche had an elaborate system of exhaust ducts and
fresh-air ejectors in its tailboom.
Radar cross-section (RCS) reduction measures include flattened and canted
body sides, making landing gear and other features retractable, and adding
fairings over the rotor hubs. It usually is not possible to achieve the
same - you can't make a helo as radar-stealthy as a fixed-wing airplane, but
helicopters generally operate at low altitude in ground clutter. Reducing
RCS also makes jamming more effective, whether from the aircraft itself or
from a standoff jammer.
I. If you want to receive individual emails
II. Receive one mail with all activity in it
III. Do not want to receive any mail at all
Regards,
Tariq Khattak, Group Manager,
GSM = 0300-9599007 and 0333-9599007
+92-300-9599007 and +92-333-9599007
Tariqgulkhattak@gmail.com
Tariqgulkhattak@hotmail.com
REQUESTS:
1)Please directly contact sender for personal/individual correspondence.
2)Try to discuss issues that will catch attention of many readers.
3)Please avoid sending messages in any language other than English
4)Avoid sending messages addressed to many recipients.
5)Do not send messages aimed at personal publicity.
6)Please do not send personal/other links unless necessary.
7)The Group is not obliged to publish printed news,
very short/long comments and objectionable material.
8)Every mail cannot be published; it will overload Mailboxes
of our valued members.
9)Try to Disagree Without Being Disagreeable, Unsympathetic and/or Unpleasant.
x==x==x==x==x==x
Please note that,
It is a common platform for journalists and all others who are interested in knowing about the issues that are sometimes not reported. This group favours philosophy of progress, reform and the protection of civil liberties. Please share and educate others. The owners and managers of this site do not necessarily agree with any of the information. It is an open forum; everyone is allowed to share anything. Mails sent by members and non-members are subject to approval. However, we are not responsible in any way for the contents of mails / opinion sent by members. We do not guarantee that the information will be completely accurate. (Nor can print and electronic media). If you find content on this site which you feel is inappropriate or inaccurate, incomplete, or useless you are most welcome to report it or contradict it.
Thanks a lot.
0 comments:
Post a Comment
Gujranwalafun@Aol.com
Gujranwala@windiowslive.com