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rotorworks (Aeronautics)
3 Jul 04 23:09
Im curious as to others opinion on this matter. Mainly should a VTOL aircraft have a VTOL emergency landing configuration?
To my knowledge Bell/Augusta have applied to have the Tilt Rotor classified as a powered lift vehile, as opposed to a helicopter. This means they dont have to meet a the autorotational requirements of a helo.
I have been told that the rate of decsent of the osprey in autorotation is around 4600ft/min, and while Im sure that the cilvilian Tilt Rotor would be a little lower, I still feel this to be very high. Combining this with a small wing, which wont give you alot of glide, to my mind seems a recipie for trouble when it all goes pearshaped.
While engine reliabitly is very good these days, there are still situations which can result a total loss of engine power.
A quick search on the net reveals a multitude of VTOL concepts and works in progress, yet almost universally say that they are safe because they have a BRS (balistic recovery system). However even a quick glance at the operation of the only mass produced VTOL vehicles operating today, helicopters, reveals that a BRS is pretty impractical for this type of environment. 字串4
My personal feeling is that if it takes off vertically, it should be able to land vertically, including engine out.
Interested to hear others thoughts.
Intermesher (Aeronautics)
4 Jul 04 15:17
It was mentioned that if the V-22 Osprey were to loose power while transitioning between hover and forward flight the descent rate is a terminal one.
GraviMan (Automotive)
5 Jul 04 8:00
"Combining this with a small wing, which wont give you alot of glide, to my mind seems a recipie for trouble when it all goes pearshaped."
Absolutely! What if there is a fuel starvation problem, especially for a machine operating in say Rescue conditions at the limit of it's range...
"My personal feeling is that if it takes off vertically, it should be able to land vertically, including engine out."
Agreed. This is why I'm so curious about the technological envelope of interleaving side-by-side tandems. The idea of risk of fatality during transition would worry the hell out of me. Chopper pilots don't wear parachutes because: 字串1
(1) There is no safe bailout procedure.
(2) They are already sitting in a giant autorotating parachute!
This is why a well maintained chopper is currently the safest way to fly - bad if the '22 undid that record...
Mart
rotorworks (Aeronautics)
12 Jul 04 1:01
Which 22 Mart the osprey or Robinson?
GraviMan (Automotive)
12 Jul 04 7:51
Sorry Helidev, I meant the Opspey. As I understand it there is no landing procedure in the event of total engine failure during transition. At the moment rotorcraft are regarded as safer than aircraft, since they can land almost anywhere that they are allowed to fly. Bush pilots fly below the curve, so are an exception...
Mart
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