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Old 03-10-2007, 02:10 PM
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Solomoriah Solomoriah is offline
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Default 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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Old 03-10-2007, 03:40 PM
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Quote:
Originally Posted by Solomoriah
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.


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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  #3  
Old 03-10-2007, 03:40 PM
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Quote:
Originally Posted by Solomoriah
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.



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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Old 03-10-2007, 03:44 PM
A Fish Named Wallyum A Fish Named Wallyum is offline
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I flew mine on a C6-7 once.
Once.
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Old 03-10-2007, 04:11 PM
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Quote:
Originally Posted by A Fish Named Wallyum
I flew mine on a C6-7 once.
Once.


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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Old 03-10-2007, 05:04 PM
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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.

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Old 03-10-2007, 06:11 PM
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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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Old 03-10-2007, 06:49 PM
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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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Old 03-11-2007, 12:40 PM
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Wow, thanks for the assistance!
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  #10  
Old 03-11-2007, 10:08 PM
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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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