#11
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Quote:
The E12 has very close to the same propellant mass as the E9, so three of them is still Level 0. Bill
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It is well past time to Drill, Baby, Drill! If your June, July, August and September was like this, you might just hate summer too... Please unload your question before you ask it unless you have a concealed harry permit. : countdown begin cr dup . 1- ?dup 0= until cr ." Launch!" cr ; Give a man a rocket and he will fly for a day; teach him to build and he will spend the rest of his days sanding... |
#12
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Quote:
Maybe the EE-Excess? Bill
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It is well past time to Drill, Baby, Drill! If your June, July, August and September was like this, you might just hate summer too... Please unload your question before you ask it unless you have a concealed harry permit. : countdown begin cr dup . 1- ?dup 0= until cr ." Launch!" cr ; Give a man a rocket and he will fly for a day; teach him to build and he will spend the rest of his days sanding... |
#13
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Now I know why I've been procrastinating on my Renegade -D build. I've been putting it off and putting it off saying next week I'll get started. Now I won't have to gut her to retrofit for these as a booster engine.
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Bernard J. Herman Ohio RLS Starport Sagitta Rockets email bherman@sagittarockets.com NAR # 97971 SR What's your idea on the best way to change Washington D.C.? Let us know at the Cantina Sagitta Cantina We're looking for a few good Catos, please tell us about any you may have had. Survey of Anecdotal Malfunctioning Engines or S.A.M.E. |
#14
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This is a welcome release. The thrust is a bit higher but overall this is still a "soft" motor. The three cluster propellant mass is 107.7g which is well under either the older 113g limit or the newer 125g limit. Its 35.9g propellant mass is over the mailability limit. I would like to see Estes and NAR petitition the USPS to increase the mailability limit to 125g based on decades of hassle free mailing including times when they did allow such mailings. It would bring the USPS in line with FAA, another federal entity. Treaty changes to allow mailing to/from the USA and G20 countries would be helpful as well.
I look forward to a high thrust D with the new Estes igniters. I urge users to give Estes feedback on reliability under different storage and launch site environments as soon as possible. You might recall, if you are old like me, the Mighty D started life as a D13 and was downrated to a D12 after field failures. The E9 started life as an E15 and was similarly downrated. This E12 seems like a middle ground compromise between these two designs. Jerry Last edited by Jerry Irvine : 10-30-2011 at 09:43 AM. |
#15
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Motor Data Estes E12 24mm
Estes E12
Pmass 35.9g Imass 59.9g 0.93" x 3.75" JEND s-N-lb 0-2-0.449 0.1-10-2.248 0.25-32-7.194 0.28-33-7.419 0.35-15-3.372 0.45-13-2.923 0.9-10-2.248 2.37-10-2.248 2.43-0-0 TOTAL IMPULSE POUND-SECONDS = 6.290105 TOTAL IMPULSE NEWTON-SECONDS = 27.978387 AVERAGE THRUST NEWTONS = 11.51374 AVERAGE THRUST POUNDS = 2.588521 SPECIFIC IMPULSE (LB-SEC/LB) = 79.370963 Attached are some Malewicki charts (pdf) for the motor in common rocket sizes and weights. Jerry |
#16
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You need no Level anything cert to cluster E motors. Level 1 cert in only required for flying H-I motors. ( or up to cluster of 1280 N-sec ). three 30Nsec E's is 90 Nsec and no certification is required.. unsure on the waiver issues, however, is the new no-notification 'large model rocket' propellant weight limit 125 grams or 113 ? ~ AL fly em high |
#17
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Has anyone tried to create an engine file for RockSim yet for this new motor?
ADDENDUM: Someone try this one out and see if I came close enough...
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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 : 10-30-2011 at 12:55 PM. |
#18
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First simulation, using the Interceptor-E file, shows the following:
Altitude -- 490' Deployment V -- 4 FPS Rod length -- 60" (took 56") This is the killer Using the new graph, as Jerry indicated, the engine is "soft". It appears great, once the model is airborne, but getting off the ground it doesn't have a lot of "oomph" when used in a design that weighs in over 13 oz loaded. I also tried it out in the SEMROC SLS Laser-X... Altitude -- 554' Deployment V -- 4 FPS Rod length -- 60" (took 49") This is a 12.5 oz design loaded, and shows great flight numbers, but lousy take-off numbers. Another test, this time the DynaStar FireFox-SHX... Altitude -- 643' Deployment V -- 15 FPS Rod Length -- 60" (took 47") This is the lightest of the three, at 11.32 oz loaded. Still weak on the take-off... Haven't simulated a Cherokee-D yet, but I expect better lift-off numbers. This engine should not be viewed as a serious BOOST engine for heavier designs; rather as a higher-performance "D" for light designs (3FNC and 4FNC variety).
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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 |
#19
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Kody and I flew our Interceptor-E on a D12-3 from a Mantis pad. The launch rod is 57" long and about a foot of that is completely wasted by the the blast deflector and the way the rod mounts in the pad. Bottom line is that a 4 foot rod is long enough with both the D12 and E12 as long as you fly on a calm day. I wouldn't attempt it in a breeze, even with 60" of usable rod. There's just too much fin/wing area to mess with the flight.
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I love sanding. Last edited by tbzep : 10-30-2011 at 09:36 PM. |
#20
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Everybody but me gripes about low altitudes of the Saturn V on a D12-3. That's the E12 simulation you need to report.
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I love sanding. Last edited by tbzep : 10-30-2011 at 09:37 PM. |
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