Hi All,
Let me begin with a short Wikipedia definition :
A standard rate turn is defined as a 3° per second turn, which completes a 360° turn in 2 minutes. This is known as a 2-minute turn, or rate one (180°/min).
Great ! Now, let’s have a look at the British turn indicator (Turn and Slip Indicator MK1a). We can read figures on each side of the turn indicator. These are 1-2-3-4 .
Great again ! But which one indicate a standard rate turn ?
After several test with the Tiger Moth I think a standard rate turn can be achieved when the needle is on 3. So my guess would be that numbers represent degrees per second (and not rate of turns).
However ...I found someone on the inernet who refered to a 1937 book« "Air Training Manual" where it’s stated "An arbitrary scale, numbered 1,2,3,4 to right and left, means that at Rate 1 a complete circle would be executed in 2 minutes, at Rate 2 in one minute, at Rate 3 in 32 seconds and at Rate 4 in 20 seconds."
Any idea?
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