Inta HM-1 (oz14359)

About this Plan

Inta HM-1. Control line near-scale contest aerobatic model.

Quote (google-translated from the Spanish): "INTA HM-1 light aircraft aerobatic semi-model for 5 to 6.5 cc engines.

This design dates from 1954 and was equipped with a FOX 35 Stunt engine. Today, circular flight techniques in acrobatics have evolved a lot, going to larger and heavier models and with more engine displacement.

However, this was a good model in its time and today it is an airplane that is comfortable to fly and capable of performing the complete table of aerobatics. with any 35 or 40 of the moment.

The HM-1 planes were completely painted in silk green, with bicolor cockades on both sides of the fuselage and the corresponding numbering behind and in front of them. He also wore cockades on both wings and towards the tips, at the same distance above and below. The mobile rudder, in white, with the cross of Saint Andrew in black. For the plane, the license plate 22 - 13 was chosen, with a number 9 on a white circle on the front engine hoods. for being the plane that Captain Castaños flew on an aerial tour of Spain.

The construction is classic and has no difficulty.

The fuselage: This consists of two sides in 3 mm raft. with 1.2 mm plywood front reinforcements. On this plywood the benches are glued, in 10 x 10 beech, and the frames B, C and D of 2.5 mm plywood. Between the B and C it is necessary to locate the deposit, before carrying out the final gluing. The top, from the cockpit to the nose. It is formed by a 12 mm balsa sheet. rounded.

The part of the cabin where the pilots will go is plated in 1.5 balsa (for example, two decorated ping-pong balls), and on this plate, glue the arches that form the cabin, sawed in 1 plywood, 2mm. Those that correspond to frames D and E are the same and the one that corresponds to F is smaller. A 2 x 2 pine strip is glued to the corresponding notches to form the upper crossbar, which serves to assemble and give strength to the cabin and glue on it and the three arches D, E and F, the transparent acetate. On the D, the windshield is glued, and on the F, the rear part of the cabin. The rear of the fuselage is veneered in 3mm balsa. below and rafting 15 mm. from above. Rudder and stabilizer are constructed of 6mm balsa. , outlining the edges.

The wing: It consists of a main spar in 3 mm raft, where the ribs fit (nine in number on each side). All of them go on a 3 mm raft, except number 3, which will be built in 2.5 mm plywood. to support the landing gear, attached with tin clips and screws. Rafted marginal edges 3 mm; the leading edge in 6x6 raft, and veneered from it to the spar in 1.5-millimeter raft. The trailing edge is made up of a 3x3 pine stringer and two 1.5-millimeter and 3-cm strips of balsa. wide, veneered above and below. The flaps, in 6 mm profiled. The articulation for the elevator and flaps control can be the classic nylon fabric hinges glued alternately on the top and bottom, or normal nylon hinges used in Radio Control, with or without a metal shaft.

The controls for the flaps are made with two normal horns of those used in circular flight, cutting the pin in the center of each one. Since the axis of each flap is not on the same line, we will have to transmit the control from the triangle with a welded rod in the shape of a T, so that each of the ends of this T enters the central holes of each horn. To transmit the command to the elevator, simply place a 2-mm diameter rod from the extreme hole of only one of the two flap horns to the central hole of the elevator horn. The control cables run inside the wing, through the holes that we will make beforehand in the ribs, according to the plan. It is convenient that this cable is made of braided steel, more flexible than a 1 mm steel rod. The cable outlets at the end of the wing are made by 1 mm aluminum or brass tubes, glued with epoxy on the inner marginal edge. A piece of 30 or 40 gms of lead is glued to the outer edge."

Direct submission to Outerzone.

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