Gee Tee I (oz6013)

About this Plan

Gee Tee I. Radio control sport model. 50-1/2in span, 502 sq. in. area, for .20 to .40 power and 4 channels. Model # pl-621. Designed by Graham T. Hall. Featured in RCM 12-75.

Quote: "Gee Tee I. Designed to meet the RCM 15-500 club racer rules, the Gee Tee I is also an excellent intermediate trainer and all around sport aircraft. Use a front rotor .40 for racing, a .20 to .40 for general sport flying. By Graham T. Hall.

The first prototype of the Gee-Tee I was designed and built during August, 1973. Shortly thereafter, RCM proposed the 15-500 class pylon racer so the design was modified slightly to meet class requirements and a second prototype was built. Prototype number three, which is depicted in the photos and on the drawing, incorporates all the. modifications that have been made to date. There is nothing extremely original or highly innovative about the Gee-Tee I, but it is a very straightforward approach to R/C aircraft construction.

The wing is in a shallow saddle and is mounted using the old standby, the rubber band mounting method, which, although not the best from an appearance standpoint,
is simple and allows for positive separation with minimum damage should an unscheduled landing occur. The nose moment is slightly longer than usual which makes for easy balancing, as well as providing plenty of room for fuel tank and batteries. The combination dihedral brace and landing gear mount transmits the force of a hard landing to the fuselage rather than to the dihedral joint. Using laminated ply for this piece not only makes for a strong assembly, but also allows it to be made without the use of a table saw for slotting.

In the flying department, the Gee-Tee makes a snappy 15-500 pylon racer. It is stable yet quite aerobatic. There are no bad tendencies that I can find so it would also serve as an intermediate trainer as well as an exciting Sunday flyer. It builds in about 30 hours and should more than reward your investment in time and materials. Okay, enough sales-pitch: Let's build!

Construction. I recommend building with either Titebond or Wilhold resin glue for all joints except those mentioned. Used properly, either of these glues will give joints with strength in excess of the building materials. Make certain that all end-grain balsa and plywood butt joints are double glued. The empennage should have the bulk of the sanding done before it is assembled to the fuselage. Depending on personal preference, the fuselage top may have either open cockpit or canopy.

The wing cores are cut from 1lb cu ft expanded bead foam. If you've never cut a wing core, don't let that stop you; send for a copy of Foam Wings from the RCM Anthology Library Series when you send for the plans. Once you get the hang of it, foam cutting is a quick and easy task, and faster by far than a built-up wing.

Fuselage. Begin by cutting the fuselage sides to the outline shown. Make certain that they are identical to insure a true fuselage. Drill the holes in the fuselage sides for the wing dowels. If you plan to use Pylon Gold-N-Rods, the control rod cut-outs should also be made. Cut Fl through F4 from 1/8 in ply and mark a vertical centerline on each. If you plan to mount your engine similar to that shown, F3 may be notched for the throttle rod. Cut the stabilizer and mark a centerline on both the top and bottom surfaces..."

Update 28/02/2017: added article, thanks to RFJ.

Supplementary file notes

Article.

Corrections?

Did we get something wrong with these details about this plan (especially the datafile)? That happens sometimes. You can help us fix it.
Add a correction