Groover 60 (oz16714)

About this Plan

Groover 60. Radio control pattern plane. Wingspan 60 in, for 60 engine.

Note the main planfile here is the (2 page) bitmap scan of the original drawing. For the vector format redrawn plan, also for (dxf) CAD, see supplement files. For 3D file, see link in the text below.

Quote: "The Groover was designed by Nathan Bast in 3 main variants: 0.40, 0.60 symetrical wing and 0.60 semi symetrical. The plans and 3D model presented here are for the 0.60 symetrical wing version. However, the original plans (also included) shows the semi-symetrical profile and the 0.40 wing planform.

Information on the Groover can be found in the following threads:
https://seniorpattern.com/Groover.html
and
https://www.rcgroups.com/forums/showthread.php?4800833-Nathan-Bast-Designs-Starting-With-The-Groover/page8
and
https://www.rcgroups.com/forums/showthread.php?2741907-The-Obscure-and-Amazing-Groover-4-60-Sport-Pattern

The fuselage is designed for an internal combustion engine but removing the engine bearers allows modification for electric. The motor mount includes an 1/8" aluminium plate. This can be replaced by 1/8" aircraft grade plywood glued on the hardwood bearers if working with aluminium is not practical.

The original plans shows the top side longerons glued on the 1/32 aircraft ply. This creates a tiny gap when transitionning from the doubler to the rear of the fuselage. The design as presented puts the longerons directly on the balsa 3/32" sides instead making the side doubler that much smaller. If glue joint are correctly done, it should not reduced the strength.

The wing was originally designed for rubber band. The version presented does not show any specific wing retention method so select your preferred one. The wing joining on this aircraft is a bit particular. The center section is partly filled with foam, leaving a space for the aileron servo. The foam supports the sheeting and prevents it from buckling under loads. However, the foam does not carry load by itself. So this means that to be strong without using fiberglaas in the center, the sheeting has to be continuous over the joint. It also relies heavily on the main landing gear block which is continuous from one wing half to the other.

The design presented here provides a dihedral brace to replace the center foam plug. Note that this modification has not been flown.

For the CG, 5" from the LE at the fuselage is a good place to start. Study the original plans and the RC groups threads before starting the build to properly understand the design.

The 3D model can be found at: https://grabcad.com/library/groover-60-rc-plane-1"

Direct submission to Outerzone.

Quote: "Hello Steve, Here are the plans for the Groover 60 sport/pattern plane designed by Nathan Bast. The airplane dates back to the 1970's. Wingspan is 60. I only did the files in 3D CAD and created the DXF files."

CAD file

This plan is available for download in CAD format.

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