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  #21  
Old 05-11-2019, 10:36 AM
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timorley timorley is offline
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I mentioned at the start of this thread I'm also building a TLP Pershing 1A. I started this before I got into 3D printing. I'm not building it stock, I'm making changes to make it look a little more like the Estes kit, I even decided to have the nose ejection break at the bottom like the Estes kit versus the small balsa nose at the tip. Trying to get the paper cones assembled for the nose was a bit of a pain to get to look right, it's not perfect, but it works. I wanted fins that had the dimensional profile of the real Pershing 1A, so I used aileron stock to achieve the lower and upper fin profiles, saves a lot of sanding. And I made the fin pads from balsa, that did take a lot of sanding, especially to get the tube contour right. I'm not quite done with the nose and I know I added some weight with the coupler to achieve the change to the nose ejection break point and there will be a little more to go to finished the cone. It doesn't have any nose weight added and it comes in at 111 grams, compared to 113 grams for the 3D printed cone. I have the inner core tube installed in the airframe, but not the engine mount yet. In total I'm at 235 grams so far for the TLP. Here are some pictures and a comparison of the nose cones between the TLP and the 3D printed.
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Name:  Pershing1A_TLP_LowerFin.jpg
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Name:  Pershing1A_TLP_UpperFin.jpg
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Name:  Pershing1A_TLP_Nose.jpg
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Tim

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  #22  
Old 05-11-2019, 10:41 AM
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Looking good
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  #23  
Old 05-11-2019, 10:43 AM
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timorley timorley is offline
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Thanks. I have one more upper fin to 3D print. But not much time to really work on it this weekend, my daughter is in a soccer tournament.
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Tim

"You know, it, uh, won't fly unless somebody pushes the button." From the movie October Sky.

I am SAM # 0167
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  #24  
Old 05-11-2019, 11:07 AM
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ghrocketman ghrocketman is offline
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If I was building it, I would not even consider using a ridiculously small 24mm engine mount.
It should have a 29mm mount.
One can always adapt down but not up.
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  #25  
Old 05-11-2019, 12:31 PM
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timorley timorley is offline
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The TLP is already slated for a 29mm mount.
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Tim

"You know, it, uh, won't fly unless somebody pushes the button." From the movie October Sky.

I am SAM # 0167
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  #26  
Old 05-12-2019, 12:04 AM
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Fins printed. Printing cable covers and charge retainer next.
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Name:  Pershing1A_Fins.jpg
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Tim

"You know, it, uh, won't fly unless somebody pushes the button." From the movie October Sky.

I am SAM # 0167
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https://www.rocketryohio.com
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  #27  
Old 05-12-2019, 10:59 PM
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timorley timorley is offline
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I've printed the last pieces from Leo's files. The cable covers, the charge retainers, and the shock cord plate. The combined weight of these last parts is about 26 grams.

long cable cover 9 grams
short cable cover 6 grams
charge retainer 2 grams each
shock cord plate 7 grams
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Name:  Pershing1A_LastBits.jpg
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Tim

"You know, it, uh, won't fly unless somebody pushes the button." From the movie October Sky.

I am SAM # 0167
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  #28  
Old 05-12-2019, 11:13 PM
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timorley timorley is offline
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I put all the printed parts on the scale at once to see what the combined weight was, figuring it to be a little more accurate since my scale is only accurate to 1 gram. 206 grams.
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Tim

"You know, it, uh, won't fly unless somebody pushes the button." From the movie October Sky.

I am SAM # 0167
NAR 98303 Southwestern Ohio Rocketry Association (SWORA) #624
https://www.rocketryohio.com
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  #29  
Old 06-03-2019, 07:38 PM
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To help with adhesion of the fins to the body tube with epoxy, I am drilling small holes in the back. To ensure I don't accidentally drill through the front of the fin I am using my drill press so I can control the depth
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Tim

"You know, it, uh, won't fly unless somebody pushes the button." From the movie October Sky.

I am SAM # 0167
NAR 98303 Southwestern Ohio Rocketry Association (SWORA) #624
https://www.rocketryohio.com
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  #30  
Old 06-04-2019, 10:36 PM
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Put the motor mount together. 24mm, I figure if I conclude the E12 won't lift it, there are 24mm composite options, like the E30. And if I crash it, I might be unhappy, but I can always build another. Since it might fly with an E30, I used a heavy wall BT-50 and added a third centering ring for a little extra strength, which is glued inside the body tube, used a long skewer to get the epoxy in the right place as I installed the mount. Also used the Estes Pro Series 24mm motor retention and a kevlar leader.
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Name:  Pershing1AMotorMount.jpg
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Tim

"You know, it, uh, won't fly unless somebody pushes the button." From the movie October Sky.

I am SAM # 0167
NAR 98303 Southwestern Ohio Rocketry Association (SWORA) #624
https://www.rocketryohio.com
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