Precision Fin Jig
Quickest and Easiest Fin Attachment  

A real time saver, the classic "Rose" Fin Jig
has served NAR competitors, members of the
U.S. Spacemodeling Team, and many other
rocket enthusiasts for the past 30 years.
With the Fin Jig, awkward manipulation of fins
to hold them in place is eliminated. They are
accurately positioned and attached in only a
few seconds. A fin is placed flat onto the fin
support plate and against the rocket body,
where it does not require the modeler to hold
it in place. Adhesive such as CA glue is
applied along the fin root and allowed to set
by itself or an accelerator may be used. With
the fin attached to the rocket body, the body is
rotated to the next click-stop position.
Fillets can be applied immediately and are
perfectly shaped by gravity while the fins and
rocket body are at the correct angle. The job
of attaching fins to boat-tailed rockets, e.g.
FAI styles, is made much easier.
Adjustments are conveniently made for fins of
less than 1/64 in. to over 5/16 in. thickness.
They can be mounted on a rocket body to
within 1/4 degree using the 360 degree
precision dial. Any number of fins that fit
around the body tube are readily attached.
Automatic click-stops are 120 degrees apart.   
Other settings, such as those for four, five, or
more fin models, can be firmly held in place.
Root edges of thick fins can be neatly shaped
to match the body tube for a perfect fit. The
rocket bodies slide onto precision, sized
mandrels. Mandrels are available in standard
or custom diameters. Spindles holding the
mandrels are 0.2495" diameter and are
suitable for directly holding micro-motor
Besides mounting fins, the Fin Jig is used to
attach boost glider motor mounts to pylons,
position scale model features, cut fin slots,
and similar functions. It works with body tubes
to 3 in. dia. An auxiliary arm, which raises the
mechanism further above the base, is
available to accomodate fins with longer
Flights of rockets with accurately mounted fins
are noticeably straighter and higher than
those with misalignments.   
The Fin Jigs are individually, hand fabricated
in the USA from aluminum and stainless steel,
providing many years of trouble-free use.
Mandrels are machined from stable acetal
plastic (Delrin).
High Tech
Fin Jig, $440.00 without mandrels
Mandrels 10.5mm, 13mm, 18mm, 24mm  @ $35.00 each
Custom mandrels any size up to 29mm @ $47.00 each
Auxiliary Arm (increased fin span, offset positioning ) $40.00

For ordering and more information:
Finjig with Auxiliary Arm