3 fin 120 degree tool

[KI6LZO]

I have been using a standard plastic framing square with part of the 90 degree side cut out for the body tube to make sure my fins are 90 degree to each other, this has worked very well for many 4 fin rockets I have built. I came up with a way to do the same for 3 fin rockets using the same framing square, 1" aluminum angle and some carriage bolts and wing nuts. You will need to set the adjustable angle to 120 degrees.

[david raimondi]

Very nice fin jig!

 

dave

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[KI6LZO]

Thanks Dave,

I forgot to mention, the first fin has to be placed "manually". I use my rocket jig and a plum bob to place the first fin.

[Kendall, Steve]

Very creative! 

 

Steve Kendall
Tel +1 408 522 6333
Mobile +1 408 489 8808
sken...@sjm.com

 

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From: lunar-...@googlegroups.com [mailto:lunar-...@googlegroups.com] On Behalf Of KI6LZO

Sent: Sunday, February 05, 2012 5:35 PM

To: lunar-...@googlegroups.com
Subject: [LUNAR general:] 3 fin 120 degree tool

I have been using a standard plastic framing square with part of the 90 degree side cut out for the body tube to make sure my fins are 90 degree to each other, this has worked very well for many 4 fin rockets I have built. I came up with a way to do the same for 3 fin rockets using the same framing square, 1" aluminum angle and some carriage bolts and wing nuts. You will need to set the adjustable angle to 120 degrees.

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[KI6LZO]

New improved model V3.20