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  #1  
Old 10-01-2015, 05:40 PM
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Default Estes Little Joe II !!!!!!!

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  #2  
Old 10-01-2015, 05:44 PM
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Ya Hoooooo!!!

I see myself ordering at least two (hopefully more) and hopefully several capsule/LES for backups and possibly other projects.
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Old 10-01-2015, 05:55 PM
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Dang, shoulda sold my Centuri LJII last year when I had the chance!


but really, Woohoo!!! now I can actually build one!!
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Old 10-01-2015, 06:55 PM
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750ft on a D12-3. That's a little too much for my school demos. For reference, a Saturn V only flies about 120-150 ft on a really good day and is an awesome demo. I'm going to build my LJII with an interchangeable mount so that I can go with various motor configurations to get good safe liftoff velocities at low altitudes.

I'm thinking a safe low altitude flight can be made with a core B6-2 and 3 A10's. Or two B6-2's and two 1/2A3-2T's, etc. etc. The combinations are plentiful!

D12-3 total impulse 16.84ns with a peak of 29.73n

B6-2 with 3 A10's has a total impulse of 11.29ns and a peak of 31.83n
1/2A-B cluster total imp is 10.84 and a peak of 39.52n

Delay for the B6-2 is 1.53 seconds compared to the D12-3 which is 2.39 seconds.
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Old 10-01-2015, 06:57 PM
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Only $50? That's a bargain!

Time to stock up. . .
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Old 10-01-2015, 07:14 PM
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Quote:
Originally Posted by GuyNoir
Only $50? That's a bargain!

Time to stock up. . .

On Hobby Lobby 40% off coupons!!!
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Old 10-02-2015, 09:14 AM
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Quote:
Originally Posted by GuyNoir
Only $50? That's a bargain!

Time to stock up. . .
Yeah, I'm thinking everyone here (on YORF) will buy at least three or four

Doug

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  #8  
Old 12-06-2015, 07:29 AM
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007227 - Little Joe II

Skill Level 4

Length: 23.3 in. (59.2 cm)
Diameter: 3.42 in. (86.9 mm)
Estimated Weight 8.4 oz. (238.1 g)

Molded Plastic Fins, Waterslide Decals, 24 in. (61 cm) Parachute Recovery

Recommended Engines: E30-4 Composite motor ONLY.

Projected Max Altitude: 800 ft. (244 m)

Estes model rocketry is recommended for ages 10 and up with adult supervision for those under 12. Unless otherwise specified, all models require assembly. Tools, construction and finishing supplies sold separately. In order to launch, a launch system, model rocket engines, starters and recovery wadding are required - sold separately-unless otherwise specified.


Hmmmm. This is an Estes MPR.

https://en.wikipedia.org/wiki/Little_Joe_II

https://www.apogeerockets.com/Rocke...mm_1-Grain_Case

https://www.apogeerockets.com/Rocke...gs/24mm_Casings
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Old 12-06-2015, 09:21 AM
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How could this model that weighs less than a Saturn V that uses a D12-3 have a motor reccommendation of E30-4 only ??
C'mon now.
I bet as small as a D12-3 or a D21-4 (18mm) or D15-4 (24mm) would be fine.
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  #10  
Old 12-06-2015, 09:28 AM
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You could probably use a piston launched D12-3, but Estes has to recommend something a simpleton can do reliably. An E30 is a good way to get a flight with some authority. 800 feet is higher than my Saturn V's went with 2xD12 and 3xD12, but that just makes it a bit of a safer flight. One wonders if a 24" chute is enough. If it is strong from plastic parts I suppose it is. We will see by this Spring.

Also 800 feet is in calm wind and good conditions. I suspect the lower end of the band for most people will be only 600 feet due to wind, humidity, non-vertical flights, etc.

We used to aim the rocket a bit into the wind so it would land closer so we could catch it.

Jerry
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