Bottom hinged ailerons

Anything to do with gliders & gliding.
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chris williams
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Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: Bottom hinged ailerons

Post by chris williams » 15 Mar 2019, 00:20

A thing of beauty nonetheless, Robbie... I've often wondered about the drag of the lower part of the Frise aileron being used to offset adverse yaw. Not a problem on a powered aircraft, but on a glider, where efficiency rules...?

StephenB
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Joined: 26 Dec 2018, 08:45
Location: Hungary

Re: Bottom hinged ailerons

Post by StephenB » 15 Mar 2019, 06:41

Very impressive Robbie, both the finished result and the time and effort in achieving it.

It may have inspired me to stick with the Frise :shock:

Malcolm B
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Joined: 21 Nov 2017, 21:06
Location: Cornwall

Re: Bottom hinged ailerons

Post by Malcolm B » 15 Mar 2019, 12:41

I used robart type hinges mounted in a suitable size square section brass tube for the flaps on my 1/4 scale cub. They are a good fit and can be epoxied and secured with a 2mm bolt and nut. The whole assembly can then be packed in balsa or ply for an easy attachment to the wing.

StephenB
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Joined: 26 Dec 2018, 08:45
Location: Hungary

Re: Bottom hinged ailerons

Post by StephenB » 15 Mar 2019, 14:33

Malcolm B wrote:
15 Mar 2019, 12:41
I used robart type hinges mounted in a suitable size square section brass tube for the flaps on my 1/4 scale cub. They are a good fit and can be epoxied and secured with a 2mm bolt and nut. The whole assembly can then be packed in balsa or ply for an easy attachment to the wing.
Interesting Malcolm, any pictures?

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RobbieB
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Re: Bottom hinged ailerons

Post by RobbieB » 17 Mar 2019, 22:40

chris williams wrote:
15 Mar 2019, 00:20
'........ I've often wondered about the drag of the lower part of the Frise aileron being used to offset adverse yaw. Not a problem on a powered aircraft, but on a glider, where efficiency rules...?
Probably why they were not very common even into the semi modern era Chris.

Interestingly, having access to a full size M100 pilot (the glider that is, not the pilot although he is pretty near full size), he has told me that frise or no frise ailerons it still needed a good clog of rudder going into the roll. We shall see.

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