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#1
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flight Instruments on the Cheap
Anyone know about a seminar at SNF
discussing flight instruments made cheaply?? A while ago, I remember someone describing an attitude gage consisting of a tube loop (the loop was orientated fore and aft) filled with a liquid. Wonder if some arrangement utilizing a manometer (sp? "u" shaped open ended tube is meant) might due for airspeed?? A buddy just found A.S.S. raised an airspeed unit $70 over the 2007/2008 catalog price... Thanks, Dick |
#2
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flight Instruments on the Cheap
In a previous article, "Dick" said:
A while ago, I remember someone describing an attitude gage consisting of a tube loop (the loop was orientated fore and aft) filled with a liquid. That wouldn't work. It would point straight down during an coordinated turn. -- Paul Tomblin http://blog.xcski.com/ We'll burn that bridge when we come to it. |
#3
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flight Instruments on the Cheap
If my refreshed G memory serves, it was a four sided glass tube "loop"
with vertical instrument panel mounted portion indicating pitch via fluid level while firewall vertical portion was much shorter and remaining portions were therefore not parallel. Apparently it was used on early mail planes after WW1 for flight in IFR conditions. Believe thinking at the time ,how simple to replace "glass" with plastic tubing.. Thanks for the comment but in any case, it is the airspeed alternative I'm seeking. "Paul Tomblin" wrote in message ... In a previous article, "Dick" said: A while ago, I remember someone describing an attitude gage consisting of a tube loop (the loop was orientated fore and aft) filled with a liquid. That wouldn't work. It would point straight down during an coordinated turn. -- Paul Tomblin http://blog.xcski.com/ We'll burn that bridge when we come to it. |
#4
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flight Instruments on the Cheap
There is the Hall ASI that uses forward air pressure to lift a marker
in a tube. If my memory serves me well it is is at hallwindmeter dot com. I was thinking of using one as a backup gauge on a slow biplane. I am not sure what your ASI range requirements are but this may be a good place to look. Best Regards Steve On Apr 21, 5:59*pm, "Dick" wrote: Anyone know about a seminar at SNF discussing flight instruments made cheaply?? A while ago, I remember someone describing an attitude gage consisting of a tube loop (the loop was orientated fore and aft) filled with a liquid. Wonder if some arrangement utilizing a manometer (sp? "u" shaped open ended tube is meant) might due for airspeed?? A buddy just found A.S.S. raised an airspeed unit $70 over the 2007/2008 catalog price... Thanks, Dick |
#5
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flight Instruments on the Cheap
Thanks. Interesting and I've asked manufacturer if a higher mph range might
be made available. I wonder what the downside of such an instrument is?? "steveukman" wrote in message ... There is the Hall ASI that uses forward air pressure to lift a marker in a tube. If my memory serves me well it is is at hallwindmeter dot com. I was thinking of using one as a backup gauge on a slow biplane. I am not sure what your ASI range requirements are but this may be a good place to look. Best Regards Steve On Apr 21, 5:59 pm, "Dick" wrote: Anyone know about a seminar at SNF discussing flight instruments made cheaply?? A while ago, I remember someone describing an attitude gage consisting of a tube loop (the loop was orientated fore and aft) filled with a liquid. Wonder if some arrangement utilizing a manometer (sp? "u" shaped open ended tube is meant) might due for airspeed?? A buddy just found A.S.S. raised an airspeed unit $70 over the 2007/2008 catalog price... Thanks, Dick |
#6
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flight Instruments on the Cheap
"Dick" wrote in message news:fevPj.5393$Ux4.1316@trnddc07... Thanks. Interesting and I've asked manufacturer if a higher mph range might be made available. I wonder what the downside of such an instrument is?? The up side (besides cost) is extremely good resolution at slow air speeds. Especially 0 to 30, where conventional ASIs are usually less reliable, if even calibrated in that range. I bought one from AS&S years ago calibrated for a helo that wasn't bad, but not nearly as repeatable as a Hall in the low speed range. The only down side I recall is their reliance on gravity to oppose their reading. They bump around a little bit on bumpy days, and of coarse are useless when inverted. I don't recall much change on positive G's. They seemed accurate in 2 or three G turns because the indicating disk is very light weight. Just the zero and half G's loads were a problem. |
#7
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flight Instruments on the Cheap
It might be realistic to look at Dwyer Instruments; there are many
offerings. In particular, the $50 unit http://www.dwyer-inst.com/htdocs/air...riesMWSpec.CFM is 0-55 kt, resolution of 0.2 kt. Accuracy is about 5% of reading. There are mini-pitot based models, rising vane (as used on some ultralight type craft I've seen) and these rotating units. On Tue, 22 Apr 2008 20:23:30 -0500, "Maxwell" luv2^fly99@cox.^net wrote: "Dick" wrote in message news:fevPj.5393$Ux4.1316@trnddc07... Thanks. Interesting and I've asked manufacturer if a higher mph range might be made available. I wonder what the downside of such an instrument is?? The up side (besides cost) is extremely good resolution at slow air speeds. Especially 0 to 30, where conventional ASIs are usually less reliable, if even calibrated in that range. I bought one from AS&S years ago calibrated for a helo that wasn't bad, but not nearly as repeatable as a Hall in the low speed range. The only down side I recall is their reliance on gravity to oppose their reading. They bump around a little bit on bumpy days, and of coarse are useless when inverted. I don't recall much change on positive G's. They seemed accurate in 2 or three G turns because the indicating disk is very light weight. Just the zero and half G's loads were a problem. |
#8
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flight Instruments on the Cheap
That was the reason that I delayed ... but I realised that for my
purposes (backup for an EFIS) I would only be flying VFR and the only time I *really* needed a backup ASI would be at landing time, when my speed would be low enough. On Apr 22, 7:17*pm, "Dick" wrote: Thanks. Interesting and I've asked manufacturer if a higher mph range might be made available. |
#9
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flight Instruments on the Cheap
On Apr 21, 6:59 pm, "Dick" wrote:
Anyone know about a seminar at SNF discussing flight instruments made cheaply?? Does anyone know where I might obtain flight instruments that don't work? I need them for a cockpit demonstrator -- everything has to look right, but it's not going to do anything. Thanks. |
#10
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flight Instruments on the Cheap
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