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By: 23rd April 2012 at 13:18 Permalink - Edited 1st January 1970 at 01:00
-Airship perhaps? Only thing I can think of with a speed range that slow.
By: 23rd April 2012 at 13:44 Permalink - Edited 1st January 1970 at 01:00
-What is the serial number of this instrument?
By: 23rd April 2012 at 13:45 Permalink - Edited 1st January 1970 at 01:00
-Could it be from a Met Office or Control tower?
By: 23rd April 2012 at 13:47 Permalink - Edited 1st January 1970 at 01:00
-Forget that, it says Air Speed not Wind speed.:o
It would be more than acceptable in something like a Slingsby T21 though.
By: 23rd April 2012 at 14:36 Permalink - Edited 1st January 1970 at 01:00
-It would be more than acceptable in something like a Slingsby T21 though.
No. Vne in a T.21b is 92 knots, off the scale.
By: 23rd April 2012 at 16:27 Permalink - Edited 1st January 1970 at 01:00
-Can you point a T21 vertically downwards for long enough to reach 92 knots?
I last flew one 32 years ago but is I recall correctly the stall was arond 28 kt and you flew the circuit at 32kt and the approach at 35kt.
By: 23rd April 2012 at 17:08 Permalink - Edited 1st January 1970 at 01:00
-What is the serial number of this instrument?
The serial number is- 39896.
It is calibrated for use with an A.R.L spherical pressure head :confused:.
Bob T.
By: 23rd April 2012 at 18:15 Permalink - Edited 1st January 1970 at 01:00
-Halifax Mk I
Only joking of course.:p
Cees
By: 24th April 2012 at 08:20 Permalink - Edited 1st January 1970 at 01:00
-Can you point a T21 vertically downwards for long enough to reach 92 knots?
Yes. Wear goggles, though.
By: 24th April 2012 at 10:11 Permalink - Edited 1st January 1970 at 01:00
-Halifax Mk IOnly joking of course.:p
Cees
I know the one you are on about, it was a secret prototype that was built to test the possibility of using a number of surplus WW1 parts, of which there was still a large stock remaining in WW2. It was fitted with 4 Bentley rotary engines, & DH10 outer wing panels etc. Apparently it was not put into production due to the gyroscopic affects of the rotary engines, making it a bit twitchy to fly :rolleyes::D.
Bob T.
By: 24th April 2012 at 10:13 Permalink - Edited 1st January 1970 at 01:00
-Yes. Wear goggles, though.
& write out your last will & testicle :diablo:.
By: 24th April 2012 at 10:21 Permalink - Edited 1st January 1970 at 01:00
-& write out your last will & testicle :diablo:.
It's not that bad actually:
http://thermiekfotowedstrijd.nl/album/displayimage.php?pid=1010
(though this is cheating: it's a Prefect in a vertical dive, as our T21 is not flying yet)
By: 25th April 2012 at 12:42 Permalink - Edited 1st January 1970 at 01:00
-This might be a complete red herring but A.R.L could refer to the Aeronautical Research Laboratory of Australia http://www.eoas.info/biogs/A000309b.htm
The spherical pressure head refers to the design of the pitot head where the tip of it was a rounded shape based on sciantific work by Ludwig Prandtl.
This doesnt answer what the application would have been.
Richard
By: 12th May 2012 at 17:41 Permalink - Edited 1st January 1970 at 01:00
-Came across this the other day Bob and thought of you....
70 knots = 80.6 m.p.h.
By: 13th May 2012 at 08:08 Permalink - Edited 1st January 1970 at 01:00
-Hi Alan
Thanks for the info, it's supprising what stuff is still turning up.
Bob T.
Posts: 1,101
By: sopwith.7f1 - 23rd April 2012 at 13:12 - Edited 2nd October 2019 at 11:40
I recently acquired this airspeed indicator, it appears to be based on a MK V asi, but there are no military markings on it.
Can any one shed some light on exactly what type it is etc ?.
Cheer's.
Bob T.