EARLY A.S.I ?

Hi Alan

Thanks for the info, it’s supprising what stuff is still turning up.

Bob T.

Hi Alan

Thanks for the info, it’s supprising what stuff is still turning up.

Bob T.

Came across this the other day Bob and thought of you….

70 knots = 80.6 m.p.h.

Came across this the other day Bob and thought of you….

70 knots = 80.6 m.p.h.

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

& 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)

Yes. Wear goggles, though.

& write out your last will & testicle :diablo:.

Halifax Mk I

Only 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.

Can you point a T21 vertically downwards for long enough to reach 92 knots?

Yes. Wear goggles, though.

Halifax Mk I

Only joking of course.:p

Cees

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.

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.

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.

Forget that, it says Air Speed not Wind speed.:o

It would be more than acceptable in something like a Slingsby T21 though.

Could it be from a Met Office or Control tower?

What is the serial number of this instrument?

Airship perhaps? Only thing I can think of with a speed range that slow.