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Sold 3D PRINTED FIN CAN FOR LOC BT2.56

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Thundercloud

Thundercloud

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Light and Strong 3D printed fin can for LOC BT2.56 tubing. It features four fins with a semispan of 2.90”, a rail button boss threaded 6-32, and it weighs 70 grams. Sell $29 including postage to continental US.
BT256 Fincan 20190324.JPG
 
Yep! I like to think of the fin can sliding over the tube, and a little bit of glue will hold it in place. It will require a small spacer for the front rail button so they will be at the same height, which I can print for you for free. Fin Cans are a great time saver, plus they are perfectly straight every time.
 
This not a dumb question at all. The catalog OD of the tube is 2.630", and the target ID of the finished product is about 2.640". This gives a light snug fit due to the texture of the inside, but still has some room for adhesive.
 
Can you make other sizes of fin can like this? I am building a 38mm min diameter CF rocket. The outer diameter of the CF body tube measures 1.635”. If you can make that, how much would you want to make it and ship to Maryland?

Tom
 
I can modify my design for that size. It sounds like a high performance rocket, and if so, we should consider a stronger and more heat resistant material than the basic PLA plastic that I am currently using. We should also consider making it solid instead of honeycomb fill. These features will of course add cost. Can you give me desired parameters such as number of fins and fin dimensions? Once we have a design that we like, then I can quote a price.
 
Thundercloud said:
I can modify my design for that size. It sounds like a high performance rocket, and if so, we should consider a stronger and more heat resistant material than the basic PLA plastic that I am currently using. We should also consider making it solid instead of honeycomb fill. These features will of course add cost. Can you give me desired parameters such as number of fins and fin dimensions? Once we have a design that we like, then I can quote a price.
Click to expand...

I don't know the plastic material characteristics, so I would defer to your recommendation. I do agree that it probably should not be a matrix fill (if I understand that characteristic), I had imagined it was solid. How much would that increase the cost? I like the fin count (4 fins) and shape.

I'm not sure about the rail button deign. I don't want to add a lot of drag with an extended forward button (to match the "height" of the fin can button), but that may not be a big deal anyway. How far above the body tube would the button boss put the button? Is there any way to reduce that dimension?

Thanks for this"engineering" effort,

Tom
 
Going to solid fill will not increase the cost much, especially since your tube is smaller. Going to a different material, such as carbon fiber filled, will increase the cost quite a bit (I am not set up to run other materials, and would need to pay a friend to run it for me). It sound like cost is a factor to consider, so perhaps we could just try solid PLA and a robust design.

I am guessing the button boss would be about 1/8" high. To reduce the effective height of the boss, I could add a counterbore so that the lower portion of the button sits inside the can, thus reducing the amount you have to space up the front one.

I typically use Apogee buttons for 1010 rail, which do you use? If you use something else, those dimensions would be helpful for the final design.
 
Thundercloud said:
Going to solid fill will not increase the cost much, especially since your tube is smaller. Going to a different material, such as carbon fiber filled, will increase the cost quite a bit (I am not set up to run other materials, and would need to pay a friend to run it for me). It sound like cost is a factor to consider, so perhaps we could just try solid PLA and a robust design.

I am guessing the button boss would be about 1/8" high. To reduce the effective height of the boss, I could add a counterbore so that the lower portion of the button sits inside the can, thus reducing the amount you have to space up the front one.

I typically use Apogee buttons for 1010 rail, which do you use? If you use something else, those dimensions would be helpful for the final design.
Click to expand...

Lately I've been using the extruded 1010 aluminum rail guides (see image below), not sure of exact dimensions, but I've used 1010 Apogee buttons before too.
guides.jpg
 
Those guides look nice. How thick of a "can" do you think these would clear? I can put a flat spot in the area of the rail instead of a boss to add a little more clearance. I snipped the image below from Giant Leap.
upload_2019-3-31_9-45-47.png
 
E9D4CBC1-45D1-4567-BFF5-2B754CD9CDBC.jpeg E01B61BA-4149-4675-8781-C5CAEBEF64E8.jpeg I’m now thinking that I could use a fly-away guide, but that doesn’t answer your question. Here are a couple images I took a little while ago, and they don’t help extensively because they are on a 3” body tube. In answer to you question I think I could live with a 0.1” to 0.125” spacing if you can make the can base that thin. The tan colored rail guide in the photos measures a little over 0.1” at its thinnest point.
 

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