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Old 12-14-2019, 06:49 PM
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Default Looking for Maxi Honest John fins

I'm planning to build a Maxi Honest John this winter, and was wondering if anyone's printed fins for it. I've looked through thingverse, shapeways, and boyce aerospace, and haven't found any files yet. I'll beef up the stock fins if needed, but thought I'd see if 3D printed fins was an option.
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Old 12-15-2019, 07:42 AM
jetlag jetlag is offline
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Quote:
Originally Posted by PaulK
I'm planning to build a Maxi Honest John this winter, and was wondering if anyone's printed fins for it. I've looked through thingverse, shapeways, and boyce aerospace, and haven't found any files yet. I'll beef up the stock fins if needed, but thought I'd see if 3D printed fins was an option.


Boyce aerospace is your Huckleberry! He has them, I think.
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Old 12-15-2019, 01:39 PM
BARGeezer BARGeezer is offline
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Boyce Aerospace has the BT-80 fin unit (fins and fin can) in their builders kit. You can inquire as to whether they will sell you the unit separately and at what price point. Or ask if they can print only the fins without the can.
Also Aerobotix at Shapeways has BT-50,55, and I think 60 Hojo fins. Ask Kevin Cespedes at Aerobotix if he can upscale those for a BT-80 Maxi Hojo, and at what price.
Don't think either of those vendors will give you their files to upscale, though.
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Old 12-15-2019, 04:01 PM
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Pic of 3D parts that Boyce Aerospace makes
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Old 12-16-2019, 01:16 AM
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Quote:
Originally Posted by PaulK
I'm planning to build a Maxi Honest John this winter, and was wondering if anyone's printed fins for it. I've looked through thingverse, shapeways, and boyce aerospace, and haven't found any files yet. I'll beef up the stock fins if needed, but thought I'd see if 3D printed fins was an option.


I am working on my Maxi HoJo, and using the same technique used to beef up the vacuformed fins on the Maxi V-2. The article was in TRF a few years ago, by James Duffy. He used CA to attach the fin halves onto. 1/32” balsa, then used wood glue to glue the balsa sheets together. I am using the same method, but using basswood since I could not find quality 1/32” balsa. The first fin seems a little thick to me, and in retrospect I wish I would have bonded both halves to just one piece of basswood. I cannot quit now, it would look to odd to have 3 thinner fins. I may just finish it, fly it, and think about replacing with a Boyce fin can at some point.

Here is link to article.

https://www.rocketryforum.com/threa...ute-v-2.140236/
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Old 12-16-2019, 04:19 PM
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....or you could attempt an upscale of my built up fin technique that I used on the current version. It’s described in detail in my thread “built up fins for the new HoJo”.
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Old 12-21-2019, 08:48 AM
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Quote:
Originally Posted by jeffyjeep
....or you could attempt an upscale of my built up fin technique that I used on the current version. It’s described in detail in my thread “built up fins for the new HoJo”.
I may do just that, thanks Jeff. The fin can from Boyce is $60 + $12 shipping - while I'm sure it's a great fin can, the Maxi-Brute kit simply isn't worth that much upgrade cost.

Here's your thread:
https://www.oldrocketforum.com/showthread.php?t=15611

I like the idea of a TTW core, yet keeping the kit's skins. The hardest part will be getting the correct bevel on the stringers for a tight fit with the skins. Dowels would be too large for these fins (1/4"), so I'll probably use basswood strips, which will be easier to bevel.
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