Activity

Along similar lines, depending on the weight of the bird…How about heliarc welding an Acme rail guide to the outside of a slimline retainer? The acme has less frontal area than a traditional button. If you’re partial to the inherently…   Read more»

I need to figure out a way to sink a 10/24 screw into the wall of the airframe, and all the anchorage I have to work with is the thickness of the wall of the tube, period… I’d guess 1/16″…   Read more»

Here’s another thought. Position the end of the motor about 1/2″ into the tube – or – at least leave enough airframe exposed for a screw. It won’t fit — the motor won’t go into the tube, because the aft…   Read more»

Upon reading the initial question, I assumed the problem was only how to attach the button to the airframe securely, but I think there is more to it. How do you attach the button or something similar to the airframe…   Read more»

Duck tape, lots of duck tape… do the PEM thing, that should hold it fine. I’m glad you started this thread, John. Tim Thomas and I will be faced with this problem next year…

Depending on how you’re retaining your motor casing… you could make a plate (with a hole in the center to allow the nozzle through but small enough to retain the motor) and weld either a 1/4×20 nut or bolt to…   Read more»

Along similar lines, depending on the weight of the bird…How about heliarc welding an Acme rail guide to the outside of a slimline retainer? The acme has less frontal area than a traditional button. If you’re partial to the inherently…   Read more»

Here’s another thought. Position the end of the motor about 1/2″ into the tube – or – at least leave enough airframe exposed for a screw. Add the rail button to the bottom of the tube aft of the end…   Read more»

This is an enigma. Without really knowing the design, how the motor is retained, where the fins are positioned relative to the airframe, etc., it’s an interesting challenge. But then, I guess that was the purpose of posing the question…   Read more»

Depending on how you’re retaining your motor casing… you could make a plate (with a hole in the center to allow the nozzle through but small enough to retain the motor) and weld either a 1/4×20 nut or bolt to…   Read more»

I was going to say that after all the tip to tip is done, drill it for a pem-nut, install the Pem nut with a bit of epoxy. Install the button and screw, then grind off the bit projecting through…   Read more»

Oh, and I’m not sure if I’m insulted or complimented by the GEEK comment.Ha! that is a compliment. The UprOar was flown by the “League of Extraordinary Geeks”. Trust me, Ed– you’d know it if I insulted you 🙂

I was going to say that after all the tip to tip is done, drill it for a pem-nut, install the Pem nut with a bit of epoxy. Install the button and screw, then grind off the bit projecting through…   Read more»

Oh, and I’m not sure if I’m insulted or complimented by the GEEK comment.

Rather than puting the screw in from the outside, how ’bout puting the screw in from the inside and have the nut on the outside. Maybe a stove bolt or machine screw thats counter sunk into the tube just enough…   Read more»

HMMM… sounds interesting.Do you have any space aft of the fins? What if you had a band clamp (similar to a hose clamp but without the big screw fitting) holding a thin threaded plate for the rail button? Then you…   Read more»

I hope this helps.Doug

It does indeed – many thanks! BTW, you should have something on your doorstep today…

You may also want to consider West Systems 410 Microlight filler. You can add it to any brand epoxy and depending on how much you add you can get any consistency you want from syrup to peanut butter.If I am…   Read more»

I have not used AeroPoxy Light but based on it’s description it seems similar to something I have used called SuperFil. Have you tried it? It is a two part epoxy based set-up with lots of filler. It’s ratio is…   Read more»

Ron, will be out with our new Rocket Monitor Computer system RMCS. It is a full blown flight computer with 4 pyro channels that you can configure anyway you want including a timer. I will be demoing the boards at…   Read more»