AMA PT (oz5720)

About this Plan

A.M.A. PT. Low wing sport model for single channel RC.

Quote: "THE AMA 'PT'. Design by Frank Ehling, text by Don Dewey. Full size plans for an outstanding single channel low wing design for .010 power. Excellent Sunday flier on escapement or single channel pulse.

THE AMA 'PT' was designed to provide a simple, sturdy, and consistent sport single channel airplane using the Cox Tee Dee .010 engine. It is a model that will provide the sport flier, as well as the complete novice, many air hours of flying pleasure. Its performance is every bit as appealing as its design, and its rugged construction assures its longevity. For the multi pilot looking for a model to fly from the near-by schoolyard ... why not try the AMA PT?

Construction. The wing is exceptionally rugged and utilizes no spars whatsoever. Begin by cutting out 22 ribs from medium 1/16 sheet along with 3 1/16 center section ribs. Stack together and sand. Cut the 1/4 in square spruce leading edge to proper length for each panel. Pin in place over the plans. Add lower center section sheeting. Cut the V tapered trailing edge to length and pin in place over each panel.

Now pin the ribs and place and glue at the leading and trailing edge of each. Do not put the center section rib in place at this time. Add the 3/4 in sheet braces at the tip ribs. Rough carve tips to shape and cement in place.

When both wing panels are dry, remove from plans, block up for dihedral, then add plywood dihe-dral braces. Add top center section sheeting. Allow to dry thoroughly. Re-move from board, and sand. Add land-ing gear installation. Reinforce center section joint with fibreglass and resin or fibreglass tape and Hobbypoxy glue. Dope framework and cover with lightweight silkspan.

Fuselage. Cut two fuselage sides from medium 3/32 sheet. Cut all formers from 3/32 sheet and the firewall from 1/8 ply. Add formers to sides, making sure that fuselage is perfectly aligned. Check for alignment with a draftsman's triangle. Add medium soft balsa blocks behind firewall and trim to shape. Glue stringers in place.

Carve top block from soft balsa and hollow as shown. This may be secured with dress snaps or held in place with rubber bands. Add escapement torque rod, using bulkheads as bearing supports. Add balsa sheet support floor above battery area. Add balsa block behind firewall. Sheet fuselage bottom with 1/16 sheet..."

Direct submission to Outerzone.

Supplementary file notes

Article page, text and pic, thanks to Pit.

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