As you might expect, the military has conducted extensive studies on BIRD
AVOIDANCE in flight operations. One of your FOT has been involved in those
studies, with an office in the Air Force Academy.
Those studies are easily justified when compared to the cost of equipment and
pilot training.
Joe
>It's not just ingestion into the engines that make bird strikes
>dangerous. Years ago I worked on the B-1B program and we had a ship go
>down in Colorado on a low level training mission. A pelican, that's
>right a pelican in Colorado, struck the joint between the engine nacelle
>and the wing, penetrated the nacelle and took out fuel and hydraulic
>lines. The result was fire, loss of thrust and control authority. All of
>this at 500mph and about 500ft. The four crewman ejected safely but
>there were two instructor/observers on board in jump seats. They didn't
>have time to get out. The vulnerable area the bird hit was only about 4
>inches high and covered by a thin aerodynamic fairing. A true case of a
>golden BB. As a result there was a mod implemented where they put a
>rigid deflector behind the aerodynamic fairing.
>
>Richard Taylor wrote:
>> I think you have not touched on the big numbers. You have to add the
>> velocity of the turbine blades turning at who-knows-what supersonic speed.
>>
>>
>>
>> -----Original Message-----
>> From: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] On
>> Behalf Of robert bownes
>> Sent: Monday, January 19, 2009 2:10 PM
>> To: J.C. Hassall; FOT
>> Subject: Re: [Fot] Street Legal
>>
>> f=1/2mv^2
>>
>> Mass of bird = 5kilos
>> Velocity = 300km/hr
>>
>> f=.5(5)300^2 = 225,000J
>>
>> which is
>> 53,776 Calories
>> 165951 ft pounds force
>> 213 BTU's
>>
>>
>> Alot any way you slice it.
>>
>>
>> Bob, who 30 years later, still remembered all that nonesense from A level
>> physics.
>>
>>
>> On Mon, Jan 19, 2009 at 1:59 PM, J.C. Hassall
>> <jhassall@blacksburg.net>wrote:
>>
>>
>>> At 01:47 PM 1/19/2009, Joe Curry wrote:
>>>
>>>
>>>> You'd think that after all these years, Aircraft engineers would have
>>>> figured out how to prevent debris from entering the engines.
>>>>
>>>> Something like a screen that can somehow clean itslf to keep debris from
>>>> accumulating and restricting air flow.
>>>>
>>>> The revolving clear plastic cover that the F1 car cameras use to keep the
>>>> lens clear is a possibility.
>>>>
>>>> Joe C.
>>>>
>>>>
>>> The Brits pioneered a revolving "window" in front of destroyer bridge
>>> windows ("portals"?, I'm an Army guy) during WWII. The perspex revolved
>>> fast enough to spin off water. But there's a world of difference between
>>> destroyer full chat and jet aircraft speeds. ISTR reading that a 10 pound
>>> bird packs 10K of force at 200 MPH. If I weren't so lazy I'd run the
>>>
>> math.
>>
>>> j
>>>
>>>
>>> --
>>> J.C. Hassall
>>> Blacksburg VA
>>> '63 TR4 in autox preparation
>>> 96% finished, 90% to go _______________________________________________
>>>
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