The "Derry turn" debate

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xntrick - 27 Jul 2003 19:29 GMT

Today we were going over the "Derry turn" ....and as it turns out a handfull
of peeps had their own version of what the manoeuvre should be. And we all
cracked up at the different versions (even if they were right)

Named after Mr "Derry himself of course.
But who knows the correct procedure i wonder?
Last year i seem to remember trying a search engine
and came up with loadsa tosh and not what i wanted.
Hence not bothered again and bunged the question to you hooligans.

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Ian - 27 Jul 2003 22:59 GMT

I can remember a similar discussion, I think the final agreement was :
If making the Derry turn to the left, you start with a 3/4 roll to the
right and then pull round on the elevator. Though this could be wrong,
we were, at the time, moderately drunk late one night in the campsite
at some show or other. I think we also tried to differentiate between
a cuban 8 and a reverse cuban 8, and it nearly got violent when
discussing whether it is OK to use a blip of power to flick the model
round at the top of a stall turn.

Ahhh, summer nights at the shows - half cooked food on the BBQ, way
too much beer, and not enough toilets.

See you all at Woodvale next weekend

Ian.

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david - 29 Jul 2003 22:42 GMT

The Derry turn commences with a roll the "wrong" way. If you intend turning
left you start off by rolling right, but when the plane reaches the bank
angle to turn left you carry on left as usual.

A Derry 8 is a figure 8 maneouver wherein you Derry turn at the middle.

Now, who was Derry?

David

> Today we were going over the "Derry turn" ....and as it turns out a handfull
> of peeps had their own version of what the manoeuvre should be. And we all
[quoted text clipped - 5 lines]
> and came up with loadsa tosh and not what i wanted.
> Hence not bothered again and bunged the question to you hooligans.

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Trev-W - 10 Jan 2009 20:00 GMT

>The Derry turn commences with a roll the "wrong" way. If you intend turning
>left you start off by rolling right, but when the plane reaches the bank
[quoted text clipped - 10 lines]
>> and came up with loadsa tosh and not what i wanted.
>> Hence not bothered again and bunged the question to you hooligans.

>> I expect you know who he was really, but just in case you are not joking; John Derry was a test pilot who was killed in a trajic accident at the Farnborough Airshow. He was flying a DH110 which later became the sea Vixen. In the early days of supersonic flight pilots were encouraged to run in at high speed exciting the crowd with the supersonic boom produced. On this occasion the aircraft broke up in the air and parts of it crashed into some of the audience standing on a small hillock on the airfield. I think there were around 150 killed but I cannot remember the exact number.

As I understand it, he invented the Derry Turn to gain an advantage over an
adversary in air combat. Starting a turn to the left, say, his oponent would
try to turn inside him to the left to get a good lead angle for the guns.
John would then continue rolling until he had an angle of bank that would
allow him to turn inverted to the right using down elevator. He could then
roll upright again going in almost the opposite direction to his opponent.

I expect you know who he was really

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Model Forum / Radio Controlled / Air Models / January 2009

The "Derry turn" debate