naslrogues
BAR
Has anyone had any problems with the fin jig not aligning the fins properly? Specifically with a four-finned rocket? Of course it could be me.
I'll spout about my little jig till the cows come home..
I've wanted the Estes style fin jig until I figured there had to be a better way (and the Estes jig was either not to be found, or un-affordable..)
i use my estes jig as a painting stand. bought these on recommendation of this forum, as stated above.
Qualman http://qualmanrocketry.com/Fin_Guides.html
The jig comes with a set of 13 mm, 18 mm, and 24 mm "blank" casings (never loaded) that are meant for this purpose. The 18 mm and 24 mm work better than spent motors because their insides are not charred.1) make sure the airframe is centered in the jig.
The best cheap way to insure that is to use spent motor casings. The hole in the center of the jig will accept 13mm BP case, like an Estes A10-3T. If your rocket uses 18mm motors, Estes B's or C's, then fit a 18mm casing over the 13mm casing. If your rocket uses 24mm motors, Estes D's, E's, F's, then fit a 24mm casing over the 13mm-18mm combo.
Yes, this; very important.2) The uprights of the jig are marked with offsets for 2 different fin thicknesses, 1/8 & 3/16 IIRC, depending on which side you have facing the fin. When viewed from above, the fins should be situated to the right, counter-clockwise, of the uprights.
...... The jig comes with a set of 13 mm, 18 mm, and 24 mm "blank" casings (never loaded) that are meant for this purpose. The 18 mm and 24 mm work better than spent motors because their insides are not charred.
Love the simplicity and the cost.I'll spout about my little jig till the cows come home..
I've wanted the Estes style fin jig until I figured there had to be a better way (and the Estes jig was either not to be found, or un-affordable..)
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the tooth pick is thru the center of the motor caseing. you line up the fin to the width of the pick. it is behind the fin, teh fin does not touch teh pick. it is a visual guide to ensure it is perpendicularLove the simplicity and the cost.
wonder, don’t you need an offset? Otherwise seems like the fins would be eccentric one toothpick width and one 1/2 fin width from plumb? But your results look perfect. What am I missing?
I like it. What do you do for fins that extend below the end of the tube? I guess you can just not put the motor casing in all the way.the tooth pick is thru the center of the motor caseing. you line up the fin to the width of the pick. it is behind the fin, teh fin does not touch teh pick. it is a visual guide to ensure it is perpendicular
Barbar's chiefing while trying to keep his fins on straight FTW.2. Provides a larger bong surface area, so the glue ”tack” itself is a bit faster.
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