#11
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Quote:
Run the Kevlar through that liner tube and attach it to the motor mount as you normally do. Make the Kevlar thread long enough for the piston to fully escape the tube. Then attach the other end to a screw eye at the base of the piston. Attach another screw eye to the top of the piston, and your elastic to that. You just "splice" the piston in between.
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Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 |
#12
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"Firing on All Neurons..."
Quote:
Cheers, --Jay |
#13
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Quote:
Another suggestion for reinforcing that transition... Drill out the entire center to the diameter of the ST-7 tube, then run a very long ST-7 through the transition and all the way to the rear edge of the ST-10. Use one centering ring about 0.5" in from the edge to keep the tube from shifting around. Shove a TR-7 up 2.5" in, and you've just eliminated all of the issues. The forward part of the ST-7 (exposed length) becomes the upper body, while the transition and ST-10 lower body just hang on for the ride, and you attach the fins to it. One central core tube that becomes both the upper body and the motor tube all-in-one. Come to think of it, you could eliminate the balsa transition and just use a paper shroud with one additional centering ring. Less costly, and easier to construct...
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Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 Last edited by CPMcGraw : 05-03-2006 at 11:05 PM. Reason: A third thought... |
#14
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"And now, for something *completely* different..."
Quote:
So while using one big long honkin' ST-7 all the way through this other design's ST-10 is probably overkill (IMO), all I have to do is turn the solution above around 180 degrees. Shove the ST-790 3/4" into front of the ST-10 , use a couple of centering rings (these could be lightweight and thinner than the standard ones) and a 3/4" long paper transition, and... (Figure 2 below) "--We got 'er done!" Thanks, Craig. (Talk about needing to think *outside* the box...) Cheers, --Jay Last edited by CenturiGuy : 05-05-2006 at 12:01 AM. |
#15
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Quote:
The only drawback is that area between the top of the motor mount and the bottom of the forward tube. It is going to be impossible to clean out the crud that accumulates from ejection charges. (Added) Of course, I've used the same layout in a number of my own designs, so this is not a big issue...
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Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 Last edited by CPMcGraw : 05-05-2006 at 11:49 AM. Reason: Additional thoughts... |
#16
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An Embarrassing Admission
Quote:
Which reminds me of an amusing story Bruce McLawhorn told me in the Vendors Room at NARCON involving grass seed, ducks, and firearms. (It had to do with "Stuff That Brings Out the Redneck in Us.") Cheers, --Jay |
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