Mark Kettle 1 Posted October 23, 2019 Share Posted October 23, 2019 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. Quote Link to comment Share on other sites More sharing options...
Wihtgar Posted October 24, 2019 Share Posted October 24, 2019 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. Quote Link to comment Share on other sites More sharing options...
Mark Kettle 1 Posted October 24, 2019 Author Share Posted October 24, 2019 Quote Link to comment Share on other sites More sharing options...
Mark Kettle 1 Posted October 25, 2019 Author Share Posted October 25, 2019 From another angle. Quote Link to comment Share on other sites More sharing options...
Flyer Posted October 25, 2019 Share Posted October 25, 2019 Is the droop around 10-15 degrees? .....asking for a friend Ade Quote Link to comment Share on other sites More sharing options...
Ace Posted October 25, 2019 Share Posted October 25, 2019 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. Quote Link to comment Share on other sites More sharing options...
Ace Posted October 25, 2019 Share Posted October 25, 2019 Missed the edit window 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 Quote Link to comment Share on other sites More sharing options...
Mark Kettle 1 Posted October 30, 2019 Author Share Posted October 30, 2019 Thanks for your input Ace, you've got me thinking. The droop Ade at 15% I'm not sure. Quote Link to comment Share on other sites More sharing options...
Mark Kettle 1 Posted October 30, 2019 Author Share Posted October 30, 2019 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 : Install bulkheads…and speed brakes instead Edited By Mark Kettle 1 on 30/10/2019 12:04:12 Quote Link to comment Share on other sites More sharing options...
Mark Kettle 1 Posted November 1, 2019 Author Share Posted November 1, 2019 Speed Brakes seen in this ... Walk around A North American F-86 Sabre Quote Link to comment Share on other sites More sharing options...
Andy Meade Posted November 8, 2019 Share Posted November 8, 2019 Looks like the hinge point is deep inside, and maybe a ball / eye joint on the top pivot? Quote Link to comment Share on other sites More sharing options...
Alan Gorham_ Posted November 8, 2019 Share Posted November 8, 2019 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: Quote Link to comment Share on other sites More sharing options...
Mark Kettle 1 Posted November 8, 2019 Author Share Posted November 8, 2019 Ok I'll go and have a look. Quote Link to comment Share on other sites More sharing options...
Peter Garsden Posted December 2, 2019 Share Posted December 2, 2019 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:- 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 bellcranks one for each door and 2 rods, 1 to each bellcrank. The RC Geek system and that shown shows a pneumatic valve which obviously we won't be bothering with? Have done a rough sketch Quote Link to comment Share on other sites More sharing options...
David Sack Posted July 27, 2021 Share Posted July 27, 2021 As an aside from the tech stuff, and included for historical accuracy, the colours of the airbrake bay have been painted differently on the various aircraft. For those amongst us who are troubled by such things this matters ! From my research the Fury bay initially was a standard buff colour but became red on the FJ3M. Thanks to Steve Ginter for confirmation. 1 Quote Link to comment Share on other sites More sharing options...
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