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#41
10-31-2011, 01:39 PM
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 That is, it crawls off the rod. So, with the three heavier motors and otherwise pretty much the same thrust spikes and sustainer levels, an E12-E12-E12 flight will surely be even more treacherous.I'd say, for the E12, that two stages will work well, but that 3-stagers will be pretty tricky. You'll either need a 10-foot rod or some outboard motors to get the booster moving with authority off the rod. In fact, given the extra mass (versus a D12-D12 two-stage flight) fliers will need to pay extra attention for two-stage E12-E12 flights. The two E12 motors add about 30 g more weight total to the rocket, at the aft end (versus D12-D12). So both the stablity and the rod speed must be considered. (But I'm looking forward to fliying some of those )Doug .
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#42
10-31-2011, 02:04 PM
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Sounds like just the right flight profile that GH would like. 
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Scott D. Hansen Ye Olde Rocket Shoppe - Your One Stop BAR Shoppe! Ye Olde Rocket Plans - OOP Rocket Plans From 38 Companies! Ye Olde Rocket Forum WOOSH NAR Section #558
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#43
10-31-2011, 02:04 PM
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By the way, in addition to Greg's thrust curve comparison earlier, here's one I did showing all the current Estes 24mm motors. The E12 has just a tad more spike than the D12. One very interesting thing is how all 5 of them converge very closely to about 9-10N on the sustainer portions of the curves. Doug .
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#44
10-31-2011, 02:24 PM
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Ah, ok... makes sense then... See what happens when you post too late at night! LOL Later! OL JR
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#45
10-31-2011, 02:30 PM
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How do you save this to Rocksim?? What folder do you put it in?? I have RockSim 8 by the way... Later! OL JR
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The X-87B Cruise Basselope-- THE Ultimate Weapon in the arsenal of Homeland Security and only $52 million per round!
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#46
10-31-2011, 02:44 PM
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Now Scott, c'mon now....
I only like horizontal flights of MY rockets when INTENTIONAL, such as simulating a scale Sidewinder or Sparrow flight. Watching someone ELSES creation go berzerk and powr-prang or crash, I do find funny as long as nobody gets hurt.
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When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, and HAVOC !
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#47
10-31-2011, 03:05 PM
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If you limited the launch lugs to the booster stage with a 1/4" x 40-60" rod, piston boosted the vehicle, or maybe used a 6 foot tower launcher as a preference, you could get a reasonable 3 stage flight in low wind.
Even the two stage variant could use a short delay E12-4 booster motor with good success which would considerably increase the maximum altitude from the E12-0 to E12-8 variant. I would strongly suggest piston launching and tower launching it in no wind. If your stage tube is shorter than the motor, just treat it as a fin can. Jerry U.S. Rockets MR 2B kit U.S. Rockets 3 Stage Direct kit U.S. Rockets Piston Launcher kits Modify a USR Dual 18mm Rear Eject to 24mm! 7 cluster 24mm USR Slipper kit . . . Attached is an rtf file for Slipper with 7x24mm Estes E12-6 motors, 930 feet. Last edited by Jerry Irvine : 10-31-2011 at 03:36 PM.
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#48
10-31-2011, 03:08 PM
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Well JR, I'm not a RockSim user, so you'll need to get some input from others on how to upload it into RockSim. I figure it's not too hard to do, though. Greg
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#49
10-31-2011, 04:05 PM
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You have to use the EngEdit program that comes with RockSim to append the contents of the new engine file into the existing Estes file. Open EngEdit, File|Open the "Estes.rse" file first, then File|Append the new E12 file into it. You can then File|Save or File|SaveAs back as Estes.rse. RockSim uses the RSE files for simulations. ADDENDUM: If you convert the ENG file to a stand-alone RSE file, you can also File|Reload Engine Data within RockSim to add the new file to the list, if you don't want to make the new engine a permanent entry in the master file...
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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
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#50
10-31-2011, 06:23 PM
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Ok I still don't get it... Geez I hate computers... I can get into engine edit and add the "E12" to the list, but I don't know how to put the thrust-time curve in there or anything... I thought you just uploaded the file to the **** thing somehow... didn't know you had to friggin plot the thing out point by point... Sometimes RS is more trouble than it's worth I think... Later! OL JR
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