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F86 speed brake

Gathering ideas for making fuselage speed brakes

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Mark Kettle 123/10/2019 22:42:58
2491 forum posts
1504 photos

The Sabre’s speed brakes have a pronounced droop when they’re deployed, something to take into account when adding them to the jet, but how could I make them on my model?

Here's a video on model with speed brakes.

Wihtgar24/10/2019 16:42:14
61 forum posts

I remember something similar we designed and fitted to the Firecracker just aft of the wing in the belly of the aircraft. In the instance it was called a dive brake.

Mark Kettle 124/10/2019 22:18:50
2491 forum posts
1504 photos


Mark Kettle 125/10/2019 07:33:02
2491 forum posts
1504 photos

From another angle.

Flyer25/10/2019 07:51:19
571 forum posts
90 photos

Is the droop around 10-15 degrees? .....asking for a friend angel


Ace25/10/2019 08:46:58
285 forum posts
17 photos

No engineer, however if say he pivot point in the fus was vertical and the both arms are the same length, but the top arm had a slight dogleg into the fus. Then when the airbrake was opened/rotated the top arm would travel further causing a slight droop? only a thought.idea

Ace25/10/2019 13:25:05
285 forum posts
17 photos

Missed the edit window crying

Na sorry the above suggestion would't work.

What about the pivot base being angled in away from the skin with the brake mounted at slight twisted angle so it sat flush with the fuz when shut,  but would pivot out and down when extended?

Edited By Ace on 25/10/2019 13:43:46

Mark Kettle 130/10/2019 11:56:43
2491 forum posts
1504 photos

Thanks for your input Ace, you've got me thinking. The droop Ade at 15% I'm not sure.

Mark Kettle 130/10/2019 12:01:54
2491 forum posts
1504 photos


Mark Frankel's video, follow along has he build's a speed brake for a F4D Skyray for scale competition!


He will be showing many tips and tricks and hopefully help me tackle this RC projects like speed brakes.


His personal build blog is in this link :




Edited By Mark Kettle 1 on 30/10/2019 12:04:12

Mark Kettle 101/11/2019 16:47:27
2491 forum posts
1504 photos

Speed Brakes seen in this ...

Walk around A North American F-86 Sabre

Andy Meade08/11/2019 15:19:30
2724 forum posts
698 photos

Looks like the hinge point is deep inside, and maybe a ball / eye joint on the top pivot?

Alan Gorham_08/11/2019 15:28:47
1149 forum posts
133 photos

The location of the hinge pintles is the key. No need for a ball joint on the brake hinges, you might need one on the actuating arm.

I posted this picture in Mark's build thread which shows the relative arrangement of the pintles:


Mark Kettle 108/11/2019 17:36:52
2491 forum posts
1504 photos

Ok I'll go and have a look.

Peter Garsden02/12/2019 12:12:36
1676 forum posts
1259 photos

I think I am going to have a go at these. I figure that because it is a fibreglass fuselage, the doors will be a lot stronger and easier to craft.

I have watched the RC Geek video. What I can't quite work out is how the bell crank to operate the door opening mechanism should be designed.

This is a Kettle project methinks. Anyone any idea?

My thoughts:-

  1. Use a bellcrank with three rods - 1 to servo, 2 to the middle of each door opening outwards. It would be a 3 point crank with the rods not overlapping and fouling each other.
  2. 2 bellcranks one for each door and 2 rods, 1 to each bellcrank.
  3. The RC Geek system and that shown shows a pneumatic valve which obviously we won't be bothering with?

Have done a rough sketch


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