Ye Olde Rocket Forum

Go Back   Ye Olde Rocket Forum > Weather-Cocked > Current Kit Talk
User Name
Password
Auctions Register FAQ Members List Calendar Today's Posts Search Mark Forums Read


Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 10-01-2015, 05:40 PM
turbofireball's Avatar
turbofireball turbofireball is offline
Model Rocket Fanatic
 
Join Date: May 2011
Posts: 219
Default Estes Little Joe II !!!!!!!

__________________
turbofireball
NAR 25162
SAM 0278
Reply With Quote
  #2  
Old 10-01-2015, 05:44 PM
tbzep's Avatar
tbzep tbzep is offline
Dazed and Confused
 
Join Date: Mar 2005
Location: TN
Posts: 11,610
Default

Ya Hoooooo!!!

I see myself ordering at least two (hopefully more) and hopefully several capsule/LES for backups and possibly other projects.
__________________
I love sanding.
Reply With Quote
  #3  
Old 10-01-2015, 05:55 PM
Royatl's Avatar
Royatl Royatl is offline
SPEV/Orion wrangler
 
Join Date: Mar 2005
Location: Atlanta, GA
Posts: 2,645
Default

Dang, shoulda sold my Centuri LJII last year when I had the chance!


but really, Woohoo!!! now I can actually build one!!
__________________
Roy
nar12605
Reply With Quote
  #4  
Old 10-01-2015, 06:55 PM
tbzep's Avatar
tbzep tbzep is offline
Dazed and Confused
 
Join Date: Mar 2005
Location: TN
Posts: 11,610
Default

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.
__________________
I love sanding.
Reply With Quote
  #5  
Old 10-01-2015, 06:57 PM
GuyNoir's Avatar
GuyNoir GuyNoir is offline
NAR # 19250 - Life Member
 
Join Date: Sep 2008
Location: Woodstock, IL
Posts: 493
Default

Only $50? That's a bargain!

Time to stock up. . .
__________________
A dark night in a city that knows how to keep its secrets. But high above the quiet streets on the 12th floor of the Acme Building, one man is still trying to find the answers to life's persistent questions. Guy Noir, Private Eye.

Fox Valley Rocketeers: http://www.foxvalleyrocketeers.org
Reply With Quote
  #6  
Old 10-01-2015, 07:14 PM
tbzep's Avatar
tbzep tbzep is offline
Dazed and Confused
 
Join Date: Mar 2005
Location: TN
Posts: 11,610
Default

Quote:
Originally Posted by GuyNoir
Only $50? That's a bargain!

Time to stock up. . .

On Hobby Lobby 40% off coupons!!!
__________________
I love sanding.
Reply With Quote
  #7  
Old 10-02-2015, 09:14 AM
Doug Sams's Avatar
Doug Sams Doug Sams is offline
Old Far...er...Rocketeer
 
Join Date: Mar 2005
Location: Plano, TX resident since 1998.
Posts: 3,965
Default

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

.
__________________
YORF member #11
Reply With Quote
  #8  
Old 12-06-2015, 07:29 AM
Jerry Irvine's Avatar
Jerry Irvine Jerry Irvine is offline
Freeform rocketry advocate.
 
Join Date: Jan 2008
Location: Claremont, CA "The intellectual capitol of the world."-WSJ
Posts: 3,780
Default

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
Reply With Quote
  #9  
Old 12-06-2015, 09:21 AM
ghrocketman's Avatar
ghrocketman ghrocketman is offline
President, MAYHEM AGITATORS, Inc.
 
Join Date: Jul 2005
Location: Nunya Bizznuss, Michigan
Posts: 13,443
Default

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.
__________________
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 !
Reply With Quote
  #10  
Old 12-06-2015, 09:28 AM
Jerry Irvine's Avatar
Jerry Irvine Jerry Irvine is offline
Freeform rocketry advocate.
 
Join Date: Jan 2008
Location: Claremont, CA "The intellectual capitol of the world."-WSJ
Posts: 3,780
Default

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
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



All times are GMT -5. The time now is 12:31 AM.


Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Ye Olde Rocket Shoppe © 1998-2024