Suggestions for hold-downs for Gyroc-type flaps?

[Rktman]

Anyone have experience fabricating their own flap hold-downs for a scratch built model? I'm referring to the method used in models like Apogee's Texas Twister. Theirs uses an injection-molded plastic collar/tab arrangement, but I'm looking for a simpler and less expensive solution than having it 3D printed. Any suggestions greatly appreciated.

 

[kuririn]

You can use a hardwood tab, like the end of a popsicle or craft stick. When the engine ejects the tabs are no longer held in place and the flaps activate. See step 8 in the Gyroc instructions here:https://www.spacemodeling.org/jimz/estes/k-24.pdf
Cheap, simple, old school. Instructions don't mention it but I would put a bevel on the tab where it contacts the motor. Cheers.

 

[GlenP]

You could make your own extension of the body tube, or even a boat tail, that has TTW like fin slots or tabs that capture the flap on the rear eject motor mount. Similar to the Texas Twister and their glider the SR-72 Darkbird. I converted the Estes Jetliner in a similar fashion to a rear-eject glider, with deployable flaps:

Estes Jetliner #3230


Also, there's the Estes SkyDart:
https://www.rocketryforum.com/threads/estes-astron-skydart-ii-build.38166/

 

[Rktman]

You could make your own extension of the body tube, or even a boat tail, that has TTW like fin slots or tabs that capture the flap on the rear eject motor mount. Similar to the Texas Twister and their glider the SR-72 Darkbird. I converted the Estes Jetliner in a similar fashion to a rear-eject glider, with deployable flaps:

Estes Jetliner #3230


Also, there's the Estes SkyDart:
https://www.rocketryforum.com/threads/estes-astron-skydart-ii-build.38166/

I could probably use that method for the upscale Gyroc I'm planning but I really need a solution that uses a method to hold down 2 flaps on either side of a fin. This is for an "airbrake" type prototype I've been working on (see pic below).

btw great Skydart build, well crafted.

 

[GlenP]

That link wasn't my Skydart build, that was another fine build done by SCIGS30.

Here are my gliders:
https://www.rocketryforum.com/threads/spy-vs-sky-sr-72-and-sky-dart.137127/

 

[Rktman]

That link wasn't my Skydart build, that was another fine build done by SCIGS30.

Here are my gliders:
https://www.rocketryforum.com/threads/spy-vs-sky-sr-72-and-sky-dart.137127/

Also beautifully done. Admirably glassy finish, and after only 2 coats of sealer and primer? Looking forward to getting my build that pristine.