Turn co-ordinator vs Turn Indicator
Join Date: Apr 2001
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The turn co-ordinator has its rate gyro precession axis inclined 30 degrees relative to the aircraft's longitudinal axis. This means it is precessed by roll and yaw. The benefit comes when flying IFR and having a major instrument failure. Flying on partial panel with a turn co-ordinator which responds to roll is a benefit.
Most purpose built aerobatic aircraft have no gyros fitted as the manoeuvring causes large rates of gyro precession and ultimate failure of the unit. If you fit one it would need to be a basic turn and slip indicator responding to yaw only.
Most purpose built aerobatic aircraft have no gyros fitted as the manoeuvring causes large rates of gyro precession and ultimate failure of the unit. If you fit one it would need to be a basic turn and slip indicator responding to yaw only.
I'm not a fan of the turn co-ordinator, although it is easier to use in IMC if the AH has failed.
It is certainly possible to use the Turn and Slip to fly IMC letdowns, but it takes a lot of practice and a fair bit of skill. The RAF IR for the Bulldog required you, without the availability of the AH or DI to achieve the overhead, and to depart on a particular track using the T&S and stopwatch and then to fly a radar letdown in simulated IMC. It wasn't too difficult given some practice and I certainly used it several times after aerobatting or tail-chasing over 8/8 cloud - although some wimps wouldn't ever consider that in case the AH didn't re-erect before entering cloud........
It is certainly possible to use the Turn and Slip to fly IMC letdowns, but it takes a lot of practice and a fair bit of skill. The RAF IR for the Bulldog required you, without the availability of the AH or DI to achieve the overhead, and to depart on a particular track using the T&S and stopwatch and then to fly a radar letdown in simulated IMC. It wasn't too difficult given some practice and I certainly used it several times after aerobatting or tail-chasing over 8/8 cloud - although some wimps wouldn't ever consider that in case the AH didn't re-erect before entering cloud........
Join Date: Apr 2001
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Sorry to be pedantic but the laser gyros don't measure the arrival time of the beam of light (a bit difficult to create a time difference at the speed of light) but rather the phase change as the gyro is moved in its plane of freedom. Llike the t/s they only have a single degree of freedom so you need three to get pitch/roll/rate of turn info.
I have seen a few instruments using Piezo elements for standby info in airliners. Absolutely fantastic as well as light and compact. Hopefully every light a/c will soon be fitted with similar systems thus providing accurate and error free attitude info!
PS - impure though it is I find the turn coordinator much more useful than a t/s when flying partial panel etc. This fact is borne out by the S-Tec rate based autopilots which only use the t/c as their reference.
I have seen a few instruments using Piezo elements for standby info in airliners. Absolutely fantastic as well as light and compact. Hopefully every light a/c will soon be fitted with similar systems thus providing accurate and error free attitude info!
PS - impure though it is I find the turn coordinator much more useful than a t/s when flying partial panel etc. This fact is borne out by the S-Tec rate based autopilots which only use the t/c as their reference.
Join Date: Jan 2001
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I have seen a few instruments using Piezo elements for standby info in airliners. Absolutely fantastic as well as light and compact. Hopefully every light a/c will soon be fitted with similar systems thus providing accurate and error free attitude info!
Got $2k to spare for a sexy toy?
GA EFIS
Got $2k to spare for a sexy toy?
GA EFIS
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We were discussing Yak 52 spins at the weekend, and a very exerienced Yak aeros pilot said that the turn needle was not always to be trusted to tell the direction of the spin. In fact in certain '52 spins the turn needles in the front and rear cockpits can indicate diffrrent directions to each other.
SSD
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