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#11
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Is Zero Indicated Airspeed Possible?
Dallas wrote in
: On Fri, 15 Aug 2008 23:02:16 +0000 (UTC), Bertie the Bunyip wrote: There is the question. I'm in a mood today. Have you flown your favorite aircraft with zero or near zero indicated airspeed? I haven't done it, but flying through some icing with the pitot heat off should do the trick. Tha'ts not flying with zero indicated airspeed, that's flying with the airspeed indicator reading zero. So... what's your answer? Hammerhaed turns and the like.. bertie |
#12
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Is Zero Indicated Airspeed Possible?
On Fri, 15 Aug 2008 23:02:16 +0000 (UTC), Bertie the Bunyip wrote:
There is the question. I'm in a mood today. Have you flown your favorite aircraft with zero or near zero indicated airspeed? I haven't done it, but flying through some icing with the pitot heat off should do the trick. So... what's your answer? -- Dallas |
#13
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Is Zero Indicated Airspeed Possible?
"Dallas" wrote in message
... On Fri, 15 Aug 2008 23:02:16 +0000 (UTC), Bertie the Bunyip wrote: There is the question. I'm in a mood today. Have you flown your favorite aircraft with zero or near zero indicated airspeed? I haven't done it, but flying through some icing with the pitot heat off should do the trick. So... what's your answer? -- Dallas If the pitot and weep hole ice over, the airspeed will not change until you change altitude. -- Regards, BobF. |
#14
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Is Zero Indicated Airspeed Possible?
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#15
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Is Zero Indicated Airspeed Possible?
"Bob F." wrote in message
. .. "Dallas" wrote in message ... On Fri, 15 Aug 2008 23:02:16 +0000 (UTC), Bertie the Bunyip wrote: There is the question. I'm in a mood today. Have you flown your favorite aircraft with zero or near zero indicated airspeed? I haven't done it, but flying through some icing with the pitot heat off should do the trick. So... what's your answer? -- Dallas If the pitot and weep hole ice over, the airspeed will not change until you change altitude. -- Regards, BobF. I had these airspeed experiences: 1. We were moving gliders from our winter storage location to our filed of operation near Seattle. It was the first flight in the morning. This was an extremely short field take off. We had a specially developed technique to handle this including a very short tow rope. I was towing using a Pawnee and noticed the AS to be very sluggish and it stopped at about 50 Kts. I was committed for this size field and with a glider behind me to boot. I wasn't sure of how fast I was going and just depended on experience, aircraft feel and field length. I just cleared the fence. We climbed to our agreed altitude, and kept a known throttle setting. When we got near our final field, the glider released. My ASI was still indicating abt 60 kts but not changing except with altitude. I did a couple of stalls in order to refresh myself of the nuances and feel of the Pawnee and then returned to the field and made an uneventful landing. I later talked to the glider pilot and to my delight he said he didn't notice anything out of the ordinary during the whole event. A bug was found wedged in the pitot tube. 2. I had an instrument student on a 172 long cross country from SJC. We got clearance, took off, and I noticed the ASI behaving very similarly. It was indicating low but for some reason, the student said nothing. Just before entering the cloud base, I pushed it over, asked the student to return for a landing, negotiated this all with the tower and the student made an airspeed indicator failure landing, a little hot, but just fine. Taxied back (still indicating about 40 kts) to the flight school and pried out another bug. A story I know of: 727, pitot heat breaker tripped, pilot didn't know. Pitot (actually called an "air data sensor") froze over and as he was climbing the ASI was now behaving like an altimeter. As the AS was increasing, he was increasing pitch. It wasn't until he reached "stick shaker" did he put it all together. There might be another variation and more details to this story, since I now only remember the lesson and not the facts. -- Regards, BobF. |
#16
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Is Zero Indicated Airspeed Possible?
"Bob F." wrote in
: "Bob F." wrote in message . .. "Dallas" wrote in message ... On Fri, 15 Aug 2008 23:02:16 +0000 (UTC), Bertie the Bunyip wrote: There is the question. I'm in a mood today. Have you flown your favorite aircraft with zero or near zero indicated airspeed? I haven't done it, but flying through some icing with the pitot heat off should do the trick. So... what's your answer? -- Dallas If the pitot and weep hole ice over, the airspeed will not change until you change altitude. -- Regards, BobF. I had these airspeed experiences: 1. We were moving gliders from our winter storage location to our filed of operation near Seattle. It was the first flight in the morning. This was an extremely short field take off. We had a specially developed technique to handle this including a very short tow rope. I was towing using a Pawnee and noticed the AS to be very sluggish and it stopped at about 50 Kts. I was committed for this size field and with a glider behind me to boot. I wasn't sure of how fast I was going and just depended on experience, aircraft feel and field length. I just cleared the fence. We climbed to our agreed altitude, and kept a known throttle setting. When we got near our final field, the glider released. My ASI was still indicating abt 60 kts but not changing except with altitude. I did a couple of stalls in order to refresh myself of the nuances and feel of the Pawnee and then returned to the field and made an uneventful landing. I later talked to the glider pilot and to my delight he said he didn't notice anything out of the ordinary during the whole event. A bug was found wedged in the pitot tube. 2. I had an instrument student on a 172 long cross country from SJC. We got clearance, took off, and I noticed the ASI behaving very similarly. It was indicating low but for some reason, the student said nothing. Just before entering the cloud base, I pushed it over, asked the student to return for a landing, negotiated this all with the tower and the student made an airspeed indicator failure landing, a little hot, but just fine. Taxied back (still indicating about 40 kts) to the flight school and pried out another bug. A story I know of: 727, pitot heat breaker tripped, pilot didn't know. Pitot (actually called an "air data sensor") froze over and as he was climbing the ASI was now behaving like an altimeter. As the AS was increasing, he was increasing pitch. It wasn't until he reached "stick shaker" did he put it all together. There might be another variation and more details to this story, since I now only remember the lesson and not the facts. There was a 727 that crashed because of iced over pitot tubes. the pitot heat wasn't truned on. The early pitot heat swtiching gave you greens if the heat was n, bu tnothing if it was turned off. All Boeings were modified to have a big amber light on if the heat was left off and indications throughout the industry were rethought to ultimately develop the "dark cockpits" we have today, mostly due to that accident. Bertie |
#17
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Is Zero Indicated Airspeed Possible?
One more AS experience I just remembered.
A fellow pilot just finished completely rebuilding his A36. We agreed to a test plan. After the static tests we moved to 6 high speed taxi tests on the active rwy at RHV. We kept the tower informed before these tests via phone as a courtesy. On the first HS run, the AS went backwards about 15 dgrees to a stop and stayed there. No big deal, we instantly knew the pitot and static lines were interchanged. We competed the other 5 runs just to liftoff and stopped each time with the AS going negative each time. We went back, changed the lines around and finished the reast of our tests uneventfully. Bob F. |
#18
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Is Zero Indicated Airspeed Possible?
"Bertie the Bunyip" wrote in message
... There was a 727 that crashed because of iced over pitot tubes. the pitot heat wasn't truned on. The early pitot heat swtiching gave you greens if the heat was n, bu tnothing if it was turned off. All Boeings were modified to have a big amber light on if the heat was left off and indications throughout the industry were rethought to ultimately develop the "dark cockpits" we have today, mostly due to that accident. Bertie Thanks Bertie. Trivia Q. How many passenger windows were in the last 727 that Boeing built? A. Zero, it was a cargo plane. The windows were blocked over. They were actually installed in case the aircraft was ever converted to a PAX version. -- Regards, BobF. |
#19
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Is Zero Indicated Airspeed Possible?
OS&B
Instructing in the T-6 I used to win cokes from my Air Force students by starting a loop at zero indicated airspeed. Big John -------------------------------------------------------------------------------------------------- On Fri, 15 Aug 2008 12:00:23 -0700 (PDT), "Ol Shy & Bashful" wrote: There is the question. I'm in a mood today. Have you flown your favorite aircraft with zero or near zero indicated airspeed? I'm talking about controlled flight and predictable outcomes. Let the games begin. I'm so freaking tired of beach volleyball and the bull**** olympics that is full of professionals. Whoooooppppss I digress Zero IAS. Why is it important to pilots? And I'm talking about in flight, not sitting on the ramp with the engine off. |
#20
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Is Zero Indicated Airspeed Possible?
On Fri, 15 Aug 2008 19:54:07 -0400, Bob F. wrote:
If the pitot and weep hole ice over, the airspeed will not change until you change altitude. Whoops.. yeah... I knew that... temporary brain fart syndrome. With the hole iced over it will act like an altimeter until the static port ices over... then it just freezes in place. -- Dallas |
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