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  #1  
Old 05-20-2019, 02:50 PM
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Tau Zero Tau Zero is offline
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Exclamation Centuri / Enerjet Parts - 3D Printing

Over on Facebook, Jack Hydrazine shared a link to the group: Centuri Model Rockets.

"I have just published a 3D version of the Enerjet 1340 fin can that's pretty much an exact copy of the real thing which you can download from Thingiverse for free and print. Several Centuri kits used this fin can."

https://www.thingiverse.com/thing:3...ps117KR2lpugxR8

"This is a replacement fin can for the following model rockets:

Enerjet 1340
Enerjet 1340/20
Centuri Phoenix Bird
Centuri Argus
Centuri MARS Project
Estes Longshot
Estes Maniac
Estes Challenger II
Estes Eliminator
Estes Eliminator XL

The dimensions were taken right from fin can and put into the CAD program I used to design it. The tubing designed to use it is Centuri ST-13 and the Estes BT-56. You can always scale it up or down to fit.

Will it reach and pass through transonic speeds and even into supersonic speeds remains to be seen. The massed produced one that came with various kits was not able to do so."


Posted per LTVscout's request.
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  #2  
Old 05-20-2019, 03:08 PM
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Default Centuri Parts - Doug Holverson

Centuri 5 Series Plastic Nose Cones

https://www.thingiverse.com/thing:559583


Centuri 7 Series Plastic Nose Cones

https://www.thingiverse.com/thing:560706


Centuri PNC 89

https://www.thingiverse.com/thing:576222


Doug's Fun Nozzle Pack #1

https://www.thingiverse.com/thing:559511

.
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Old 05-20-2019, 03:22 PM
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Thanks, Jay!
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  #4  
Old 05-20-2019, 04:33 PM
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Very cool !
+1 to the Thanks !
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  #5  
Old 05-20-2019, 08:43 PM
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Quote:
Originally Posted by Tau Zero
Over on Facebook, Jack Hydrazine shared a link to the group: Centuri Model Rockets.

"I have just published a 3D version of the Enerjet 1340 fin can that's pretty much an exact copy of the real thing which you can download from Thingiverse for free and print. Several Centuri kits used this fin can."

https://www.thingiverse.com/thing:3...ps117KR2lpugxR8

"This is a replacement fin can for the following model rockets:

Enerjet 1340
Enerjet 1340/20
Centuri Phoenix Bird
Centuri Argus
Centuri MARS Project
Estes Longshot
Estes Maniac
Estes Challenger II
Estes Eliminator
Estes Eliminator XL

The dimensions were taken right from fin can and put into the CAD program I used to design it. The tubing designed to use it is Centuri ST-13 and the Estes BT-56. You can always scale it up or down to fit.

Will it reach and pass through transonic speeds and even into supersonic speeds remains to be seen. The massed produced one that came with various kits was not able to do so."


Posted per LTVscout's request.


Jay,

Many Thanks! I will try to print up a few to go with the nosecones and transitions I already made http://www.oldrocketforum.com/showthread.php?t=17892.
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Old 05-21-2019, 11:20 AM
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Default 1340 Fin Can

It may not be in keeping with things from the past, but I think that fin can would be better off with out the open area used a launch lug. It would work for two stagers, but for a single stage, make it smooth all the way around.
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Old 05-21-2019, 09:46 PM
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My first attempt to print the fin-can for the 1320/1340 didn't go very well. I tried using red ABS filament with some printer settings that gave a low amount of warp in previous 3D prints I made, but the plastic won out and warped causing the fins to split see attached photo. Well at least I got a full print and can see the issues that need some attention for a good 3D print. I will probably try using PLA filament for the next attempt which is much less prone to warping but lower in strength and not as heat tolerant as ABS. I thought the ABS would make for a better fin-can because of its better resistance to heat. If I ever make an enclosure for my 3D printer perhaps I will be able to get an acceptable print in ABS plastic.
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Old 05-21-2019, 10:03 PM
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Bruce,

It looks like you sealed the area under the integral launch lug rather than leave it open as in the original, is that right? And the color is very similar to the Argus I had in the 70's.

Looking forward to you working out the bugs.

What, more or less, do you anticipate the cost for the fin can would be?
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  #9  
Old 05-21-2019, 11:29 PM
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Mark,

The area under the launch lug on the fin-can is sealed by the brim that the 3D printer software uses to adhere the part to the printer bed. It is only 0.36mm thick in this case and is easily removed. The color is a red ABS filament made by Vilarox that I have been using for duplicating the Centuri nosecones, it close to the original Centuri red orange color but not quite.

If I ever get a good print of this fin-can I will ask around $15.00 for the printed part (depends on the plastic). I have been asking $8.00 for shipping so the whole set; nosecone, coupler and fin-can will be $29.00 or a total of $37.00 with shipping. I just paid $32.00 for an Estes Eliminator Kit (#1950) that contains the nosecone and fin-can so I am not sure if I want to sell the fin-can for less to compete with that price.

I am currently working on getting a good print with a red PLA filament for the fin can. So far I am having issues switching my printer from ABS plastic back to PLA plastic.
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  #10  
Old 05-22-2019, 07:17 AM
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Quote:
Originally Posted by MarkB.
And the color is very similar to the Argus I had in the 70's.
If that is the case then it is the likely source for the original 1340 fin units.
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