#61
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Strangely enough my recollection of the D8-0 8's was they did not completely filll the case
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Jeffrey Deem NAR16741 CIA section 527 |
#62
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It was established earlier that the explosion occurred on or about June 11, 1971. All the manufacturing dates we've seen pictured are before that date. If they outsourced after, who would they have outsourced to at that time?
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Roy nar12605 |
#63
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Well we know it wasn't Estes/Centuri. So that basically leaves MRI/MPC/AVI . No way it was FSI. I thought I had read somewhere sometime that MPC produced their engines after the explosion/fire. I have no evidence to back it up.
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"Old Rocketeer's don't die; they just go OOP".....unless you 3D print them. Last edited by shockwaveriderz : 03-27-2021 at 07:50 PM. |
#64
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Announced at the January 1971 HIAA Trade Show. The big news from Cox was the announce- ment of a new engine - a D in the standard 18mm X 70mm, "A, B, C-type," casing. The D's - a D8-0 and a D8-3 - are expected to be available before summer. The total impulse of the new Cox engine is 15.00 newton seconds making it a mid-range D. The engine has an average thrust of 8 newtons and a burn time of 1.87 seconds. Total weight is 24.2 grams for the booster and 26.2 grams for the D8-3. They were both on the NAR Certfication list as of January 31,1971. New from the L.M. Cox Company is the Cox D8. This is the first commer- cially available D engine in a standard 18 mm. x 70 mm. casing. Although only (only?) 15 newton-seconds - 20 newton- seconds is the maximum total impulse for D engines - these engines are ex- cellent performers. Having 50% more power than previously available in a standard engine casing, they offer many possibilities in Boost Glide, Rocket Glide, Plastic Model. Scale, and Egg Loft events to say nothing of high per- formance sport flying. Weighing in at 25.5 grams, the new D is available as types D8-3 and D8-0. Why aren't there any longer delays? Simple - they won't fit into the casing ! Doug Malewicki of Cox informs us that early production versions of the Cox D8 engines, as well as other Cox engines, were manufactured in an 18 mm outer diameter tube. Adding the paper wrapper made it impossible to fit the engine into a BT-20 or Centuri No. 7 tube, though there was no problem fitting it into a Cox model. To eliminate this problem, and make Cox en- gines fit all available standard size rocket kits, Cox is now manufacturing engines which measure 18 mm including the paper wrapper. Unless your hobby shop has very old engines on display, you should have no problem with fit on any engines you purchase today. In- cidentally, Doug reports that he flew many models at NARAM-13 using Cox engine BT-20 tubes, and he encountered no diffi- culty with the fit. Cox is presently changing the tooling to allow completely automated production of the D8-0 and D8-3 engines. As a result, these engines may not be available in some stores until early in February (1972). At that time, however, the automated equipment will allow high-speed production to meet the large demand for this engine.
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"Old Rocketeer's don't die; they just go OOP".....unless you 3D print them. Last edited by shockwaveriderz : 03-27-2021 at 08:31 PM. |
#65
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I have examples of unfired Cox D8-0 and D8-3 motors.
Here's some pictures of each. I have broken the pictures up into multiple posts. This set of pictures shows a side view of the casings (Note dates) and their forward ends. The D8-3 has a paper cap while the D8-0 has some sort of coating/slurry.
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Bob S.A.M. # 0014 |
#66
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Here is a depth measurement of the D8-0 motor.
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Bob S.A.M. # 0014 |
#67
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Here is the depth measurement of the D8-3 motor.
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Bob S.A.M. # 0014 |
#68
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You know, that shiny surface on the D8-0 makes me wonder if those motors were "pressed wet" ( damp / moist BP ) and then allowed to dry / cure ? Dave F. |
#69
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Cox motors were not outsourced. No information has ever come to my attention that proves otherwise. My 'latest' production date on a Cox motor is a B6-6 dated 6-7-71. My D8-0 is dated 5-14-71. My D8-3 is dated 5-27-71. My earliest is an C6-6 dated 8-12-70.
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Bob S.A.M. # 0014 |
#70
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It has been speculated that Cox motors used a much higher water percentage during the pressing process.
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Bob S.A.M. # 0014 |
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