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  #251  
Old Yesterday, 05:35 PM
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blackshire blackshire is offline
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Quote:
Originally Posted by Royatl
grabbed a bunch of loose motors out of my ready box. Mix of A8, B6, and C6 motors, mix of mfg dates from late 80's to early 2000's. Measured front, propellant location, and nozzle.. Range is over entire range of motors; individual motors were usually +- .001 or .002



Front: 0.685 +- 0.003

Propellant: half were 0.690+- 0.002, half were 0.698+- 0.003

Nozzle: 0.702 +- 0.005
When the dimensions (0.69" [it may be 0.690"] x 2.75") were given in the Estes catalogs, I wonder if they were for the casings before they were filled? Your midsection (propellant section) measurements match theirs perfectly.
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  #252  
Old Yesterday, 06:24 PM
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Royatl Royatl is offline
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Quote:
Originally Posted by blackshire
When the dimensions (0.69" [it may be 0.690"] x 2.75") were given in the Estes catalogs, I wonder if they were for the casings before they were filled? Your midsection (propellant section) measurements match theirs perfectly.



Just got out a couple of Semroc spacer tubes. They're spiral, but otherwise same as a casing. I think Carl was going to see if spirals could be used for his motors (I told him about the 1972 Estes mini motor experiments). And Carl told me he got them from the same company that does Estes' casings. one is 0.691 +- 0.001. The other is 0.688 +- 0.0005.

But yes, I think the Estes tubes may have been 0.685 empty with planned expansion through loading.
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  #253  
Old Today, 05:20 AM
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blackshire blackshire is offline
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Quote:
Originally Posted by Royatl
Just got out a couple of Semroc spacer tubes. They're spiral, but otherwise same as a casing. I think Carl was going to see if spirals could be used for his motors (I told him about the 1972 Estes mini motor experiments). And Carl told me he got them from the same company that does Estes' casings. one is 0.691 +- 0.001. The other is 0.688 +- 0.0005.

But yes, I think the Estes tubes may have been 0.685 empty with planned expansion through loading.
Thank you for posting those measurements; I had suspected that they might have "meant the loaded [with expansion] size," but wasn't sure. I never saw a spiral-wound mini motor, but I think that was also about the time when they came in colored paper (blue and possibly also green--even the Estes "Firing Line" Vampire RTF starter set shown in the catalogs then had blue mini motors during that epoch). Also:

The current Quest Q-Jet motors have plastic cases, but as Klima showed, even composite motors can use paper cases successfully. Maybe in the future, Quest could also--not necessarily to replace the plastic-cased motors--make Klima-like motors of different "ratings." Even they might successfully use spiral-wound casings, if a sufficiently tough adhesive (phenol resin, maybe) was utilized.
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http://www.lulu.com/content/paperba...an-form/8075185
http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
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  #254  
Old Today, 12:14 PM
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BEC BEC is offline
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Quick update from yesterday: I flew five more Q-Jets. The A3-4s had KILLER ejection charges but otherwise worked well. Two of the B4-4s had what seemed to be overlong delays (these both from my first shipment, both dated 050118). The other B4-4 turned in a gorgeous and quite nominal-looking flight (motor dated 052918).

I had no ignition failures and no launches upon continuity testing (our well-experienced club system has incandescent indicators and does fire Q2G2s upon continuity check). I retained the igniters with a tiny piece of 1/16 inch heat shrink tubing, pressed into place with a bamboo skewer with the point clipped off, in each case.

Upon revisiting the blue motor tube....now I'm not so sure about what I posted earlier. Some Q-Jets go into the tube that I thought was undersized just fine. More care in measuring and taking notes on my part is in order.

I'm going flying with my son and grandson in a couple of hours. I will be flying a Semroc Mini Aero Dart on Q-Jets with an AltimeterThree aboard. That will let me get measurements of delay times and such - and graphs of same. I am suspicious that my first lot of "B4-4s" are really mislabeled B4-6s, especially after that fifth flight yesterday (Alpha III to 554 feet) looked entirely nominal including a deployment time consistent with a 4 second or so delay.
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