Ye Olde Rocket Forum

Go Back   Ye Olde Rocket Forum > Work Bench > Projects
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 04-22-2019, 07:09 PM
MarkB.'s Avatar
MarkB. MarkB. is offline
Drinks Dos XX w/ a squeeze of lime
 
Join Date: Feb 2008
Location: El Paso
Posts: 923
Default EnerJet Set

Comrades:

While data-mining in the archives here, I found an underlying current of Enerjet fanatics building the Nike-Ram, 1340 and various Aero-Darts. Most of these threads are at least 6 years and in some cases as much as 13 years old. I came from a different direction building a Pterodactyl first. But I have been bitten by the bug and will be completing a 1340 based on Eliminator parts and a Nike-Ram from Semroc parts. I'd build more, but I only have the one fin can.

So I have questions:

1) Was the BT-56/ST-13 .1" coupler ever re-released?
2) On the 1340, is the .5" of tubing protruding below the fin can body tube or engine tube?
3) Are EnerJet decals available in vinyl?
4) Is it blasphemous to build them as single tubes without the payload bay?
5) The paint jobs on all the Enerjets seem very alike, especially the 1340 and the Nike-Ram.
__________________
Identifying a problem without proposing a solution is just whining.

NAR 79743
NARTrek Silver
SAM 062

Awaiting First Launch: micro V-2; Blossom V-2; Ute-Tomahawk
Finishing: Aero-Dart clone, Stiletto
Repair/Rescue: Eggspress
On the Bench: Zooch Saturn V; Atlas V 541; 2650; M-13
Dream Stage: 1/39.37 R-7

Last edited by MarkB. : 04-22-2019 at 09:17 PM.
Reply With Quote
  #2  
Old 04-22-2019, 07:22 PM
Earl's Avatar
Earl Earl is offline
Apollo Nut
 
Join Date: Dec 2006
Posts: 1,696
Default

The 1340 used heavy-walled tubing, so that .1" connector and the nose cone were unique to the 1340. To my knowlege, that cone and connector have never been re-released.

The cone for the similar looking Centuri Phoenix Bird used regular thin-walled tubing like the present day Estes Eliminator.

But, for present day cloning a decent clone can be made with your Eliminator parts. The .1" coupler can be faked by cutting a .1" length of ST-13 tube and sliding that over a regular balsa coupler.


Earl
__________________
Earl L. Cagle, Jr.
NAR# 29523
TRA# 962
SAM# 73
Owner/Producer
Point 39 Productions

Rocket-Brained Since 1970
Reply With Quote
  #3  
Old 04-22-2019, 07:40 PM
hcmbanjo's Avatar
hcmbanjo hcmbanjo is offline
When Pigs Fly!
 
Join Date: Sep 2005
Location: Orlando, FL
Posts: 948
Default

Quote:
Originally Posted by Earl
The 1340 used heavy-walled tubing, so that .1" connector and the nose cone were unique to the 1340. To my knowlege, that cone and connector have never been re-released.
The cone for the similar looking Centuri Phoenix Bird used regular thin-walled tubing like the present day Estes Eliminator.
But, for present day cloning a decent clone can be made with your Eliminator parts. The .1" coupler can be faked by cutting a .1" length of ST-13 tube and sliding that over a regular balsa coupler.
Earl


That's what I did on mine -
http://modelrocketbuilding.blogspot...-5-coupler.html
Attached Thumbnails
Click image for larger version

Name:  Enerjet 1340 005.jpg
Views: 39
Size:  69.9 KB  
__________________
Hans "Chris" Michielssen
Old/New NAR # 19086 SR

www.oddlrockets.com
www.modelrocketbuilding.blogspot.com
http://www.nar.org/educational-reso...ing-techniques/
Your results may vary
"Nose cones roll, be careful with that."
Every spaceman needs a ray gun.
Look out - I'm the Meister Shyster!
Reply With Quote
  #4  
Old 04-22-2019, 09:01 PM
BEC's Avatar
BEC BEC is offline
Master Modeler
 
Join Date: Feb 2009
Location: Auburn, Washington
Posts: 2,440
Default

I did the same thing that Chris did with respect to the coupler. Inside it is a ply disc (Semroc sells or used to sell them) to form the actual bulkhead between the payload section and the main body.

Based on the brochure (page 2 attached), the motor tube is what projects aft of the fin can.
Attached Files
File Type: pdf EnerJet1340 page 2.pdf (1.63 MB, 38 views)
__________________
Bernard Cawley
NAR 89040 L1 - Life Member
SAM 0061
AMA 42160
KG7AIE
Reply With Quote
  #5  
Old 04-22-2019, 09:43 PM
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: 3,605
Default

The bushing tube on the coupler was closer to 1/4". The fin unit was flush with the rear of the Mini-Max airframe tube. 1.25 x 1.34", and I think Semroc has it. I asked Mary@ Estes about the EJ mold and I think it was destroyed in one of Tunik's tax motivated purges.

The thin wall tube and cone has external fantasy hatches and such on the plastic coupler that were not present on the EJ mold. The fin units are the same mold.

It is the BT-11 that sticks out the rear 1/2". The PSII motor mount tube is the same part. There was no thrust ring or retainer hook so it could accept any of the E24, F52, F67 and G76.

Perfect for the new BP 29mm motors. The fin unit has a 160G80 speed limit.

Just Jerry

I don't know if John Boren is listening, but here is the modern parts list he should use to make a 2020 EJ 1340

1 PNC-13-4 RED
1 BT-13-original length whitewall
1 BT-13-original length whitewall
1 BT-13-1/4" bushing tube whitewall
1 TC-13-3 whitewall
1 PP-13 plywood plate w/center hole ply
1 SE-1 screw eye
1 SCM
1 SC
2 CR-13-29mm
1 BT-29mm
1 FU-Phoenix Bird RED
1 set Enerjet decals
1 Instructions
1 poly bag integrated header
1 face sheet printed 2 colors integrated header
1 Order form for EJ 120G76 motors. $100 each. I'll cheerfully make them.

Fin unit has integrated launch lug.

Just Jerry
__________________
Exemptions not regulations. Please support DOT treating slow burning solids as not subject to HMR. 2015 NAR President declines!
U.S. Rockets instaship. http://bit.ly/1aca7mA Please buy some rockets.
The O administration believed in tax, spend, borrow, fine, mandate, monologue. D voters will soon be very happy with the election outcome!
Model rocketry is as safe as safe can be defined in human existence. Bow and pray: GH Stine, Orville, Vern, Lee, Lonnie, Carl, etc. No, really.

Last edited by Jerry Irvine : 04-22-2019 at 10:51 PM.
Reply With Quote
  #6  
Old 04-22-2019, 10:09 PM
BEC's Avatar
BEC BEC is offline
Master Modeler
 
Join Date: Feb 2009
Location: Auburn, Washington
Posts: 2,440
Default

Speaking of that integrated launch lug.....for some reason the Eliminator instructions (at least the ones I've built) caution you to NOT use it but instead put two 3/16 launch lugs on small standoffs elsewhere on the model. On both that I've built I use both the lug in the fin unit and a 3/16 lug higher up.

When I did the Enerjet 1340 clone I used only the fin unit launch lug and it was fine.
__________________
Bernard Cawley
NAR 89040 L1 - Life Member
SAM 0061
AMA 42160
KG7AIE
Reply With Quote
  #7  
Old 04-22-2019, 10:56 PM
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: 3,605
Default

After a couple drinks Lee Piester ctitiqued the fin unit mold in detail.
__________________
Exemptions not regulations. Please support DOT treating slow burning solids as not subject to HMR. 2015 NAR President declines!
U.S. Rockets instaship. http://bit.ly/1aca7mA Please buy some rockets.
The O administration believed in tax, spend, borrow, fine, mandate, monologue. D voters will soon be very happy with the election outcome!
Model rocketry is as safe as safe can be defined in human existence. Bow and pray: GH Stine, Orville, Vern, Lee, Lonnie, Carl, etc. No, really.
Reply With Quote
  #8  
Old 04-23-2019, 09:42 PM
teflonrocketry1's Avatar
teflonrocketry1 teflonrocketry1 is offline
Craftsman
 
Join Date: Aug 2007
Location: Whitehouse, Ohio
Posts: 208
Default

I know a local hobby store that still has 2 Estes Eliminator kits on sale for $40.00. It would not be very difficult for me to 3D print a plastic coupler (or two) with a 1/4 band in the middle like the ones in the picture. I made these for a 1340 project for Blackshire. Also pictured is my failed copy of the Eliminator nosecone (printer was maladjusted for this one). The fin can might be more difficult for me to 3D print as I am still a novice at CAD drawing. PM me if you are interested.
Attached Thumbnails
Click image for larger version

Name:  1340 Stuff.jpg
Views: 52
Size:  663.6 KB  
__________________
Bruce S. Levison, NAR #69055
Reply With Quote
  #9  
Old 04-24-2019, 08:26 PM
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: 3,605
Default

If you 3D print the coupler (red) 3D print the nose cone too, to fit the Mini-Max tube (ST-125) so it is actual scale. 3D printing the fin can would be unadvisable due to how thin it is and the defects in the original design. Better to just use an Eliminator part. (I suspect a SPEV name there.)

Jerry
__________________
Exemptions not regulations. Please support DOT treating slow burning solids as not subject to HMR. 2015 NAR President declines!
U.S. Rockets instaship. http://bit.ly/1aca7mA Please buy some rockets.
The O administration believed in tax, spend, borrow, fine, mandate, monologue. D voters will soon be very happy with the election outcome!
Model rocketry is as safe as safe can be defined in human existence. Bow and pray: GH Stine, Orville, Vern, Lee, Lonnie, Carl, etc. No, really.
Reply With Quote
  #10  
Old 04-24-2019, 09:51 PM
teflonrocketry1's Avatar
teflonrocketry1 teflonrocketry1 is offline
Craftsman
 
Join Date: Aug 2007
Location: Whitehouse, Ohio
Posts: 208
Default

Quote:
Originally Posted by Jerry Irvine
If you 3D print the coupler (red) 3D print the nose cone too, to fit the Mini-Max tube (ST-125) so it is actual scale. 3D printing the fin can would be unadvisable due to how thin it is and the defects in the original design. Better to just use an Eliminator part. (I suspect a SPEV name there.)

Jerry


Jerry,

I can't find any information on ST-125 Mini-Max tube; what are its inside and outside diameters?

Thanks,
__________________
Bruce S. Levison, NAR #69055
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 06:32 PM.


Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Ye Olde Rocket Shoppe 1998-2019