- Mar 5, 2017
- Reaction score
I've got a long bottle brush that I`m thinking of using to clean up the worst of the build up. I like your idea of using a weight to knock crude loose where the brush can't reach, though my problem would be freeing up the piston when it's stuck in the open (deployed) position. There's not much room to get leverage against the front of the piston when it's jammed in the forward position (especially with my smaller 13mm Ecee).Mine weighed closer to 8oz (I tissued only the vertical stabilizers and the canard). At that weight they flew well on D12-3s. But I think with your 20-25% extra weight I'd stick with E12-4s.
Regarding frozen pistons: well, they do get awfully sticky from the ejection crud. Maybe even stuck. Before each flight, I make sure the piston is free to move:
After a few times, this knocks the crud loose, freeing up the piston so it moves fairly easy -- but it's always a bit "gritty" and never friction-less. As you know, (and this is mostly for any future EC Thunder flyers reading this), the piston wants (and needs) a bit of friction to hold itself firmly against the canard actuator after the ejection charge has fired.
- Push the piston into the tube (to boost position)
- hold the glider vertically nose down
- drop a 1-2 oz weight down the motor tube, knocking the piston forward
- rinse, lather, repeat as necessary
I like your idea of coating the aft end of the piston with JB-Weld. I'm adding that to my build!
Looking forward to your build. I agree with Dave, I'd definitely recommend using a 1/32" or thicker plywood disc in addition to JB Weld on the ejection end of your balsa piston, or consider substituting a 'glass coupler in place of the balsa, as I'd think it's way more heat resistant and less problematic in the long run.