#1
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Estes Sprint K-49 Engines Recommended
I can't find a reference for this rocket... what engines did Estes recommend for it? The plans I've found online don't have a high enough resolution scan of the packaging for me to read the list of engines, and as far as I can find they weren't listed in the instructional text.
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NAR # 115523 Once upon a better day... SAM #0076 My site: http://rocketry.gonnerman.org |
#2
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Quote:
From the 1970 catalog, page 49... 1/2A6-2 A8-3 A5-2 B4-6 B6-6 C6-7 B14-5 (Attachment from the Ninfinger files...)
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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 |
#3
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Quote:
1/2a 6-2 A 8-3 B 6-6 C 6-7 OOP motors A 5-2 B 4-6 B 14-5
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Roy nar12605 |
#4
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I flew mine on a C6-7 once.
Once.
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Bill Eichelberger NAR 79563 http://wallyum.blogspot.com/ I miss being SAM 0058 Build floor: Centuri Design Contest F-150 Hurricane Estes - Low Boom SST Semroc - Gee'Hod, Shrike, SST Shuttle In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Solar Sailer II Semroc Cyber III Ready to fly: Estes - Multi-Roc, Solar Sailer II Semroc - Earmark, Snake Jumper |
#5
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Quote:
If you flew it at VOA it hopfully found an mated with my BT-20 downscale version I flew at NARAM. Maybe there will be more of them in the spring. Mine flew once on a 13mm A3-4. Gone!
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"I'm a sandman. I've never killed anyone. I terminate runners when their time is up." Logan from "Logan's Run" http://sandmandecals.com/ |
#6
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I flew my BT-56 sized Sandman Special upscale version of teh SPRINT on an E9-8 once... even with a streamer, I had to walk FOREVER to get it back.....
This is a great model. It is perhaps one of the most drag efficient of the major mass market kits. Phred
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Just some guy..... GET GOONY!! |
#7
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I LOVE the Astron Sprint!
I do need to make a Micro Maxx size yet. And a Goony Sprint! Hey, maybe I can make that tonight!
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"I'm a sandman. I've never killed anyone. I terminate runners when their time is up." Logan from "Logan's Run" http://sandmandecals.com/ |
#8
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The CMR Paratrooper kit looks almost like an 13 mm version of the Estes Sprint. I've used
the Paratrooper recently for NAR contest events, such as the parachute duration events and even for the 1/2A flexwing duration (my flexie fits perfectly inside the main airframe). Some pics below: The first pic is the Paratrooper ready for launch in the A Parachute Duration event with the original CMR piston launcher. The piston worked, but the model suffered severe tipoff and didn't get a good time. Second flight was done without the piston. The second pic is the Paratrooper on the pad with the flexie fully enclosed ready for launch in the 1/2A Flexwing Duration. Got a nice, high boost on the 1/2A3-4T and good deployment of the flexie's wings to get a good glide for first place. The last pic is the flexie as it was found on the pavement downrange after the flight. The Sprint & Paratrooper design is definitely one that maximizes performace with the ogive nosecone and corresponding boattailing. Maybe these kits should be brought back...
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Dave, NAR # 21853 SR. |
#9
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Wow, thanks for the assistance!
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NAR # 115523 Once upon a better day... SAM #0076 My site: http://rocketry.gonnerman.org |
#10
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I have flown mine on a C6-7 SEVERAL times in large fields....never lost it either.
The B14-7 (or B8-7) is a much better choice than the B14-5 (or B8-5) unless you like longer recovery walks. With a streamer the chances of recovery failure due to ejection past apogee are very small. Trust me on this one....use UPPER stage (old purple label) engines ONLY unless you like extended walks to get it back.
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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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