Hell Hammer (oz16706)

About this Plan

Hell Hammer. Control line speed model. Wingspan 19 in, for Class B engines.

Quote: "Building Your Hellhammer

FUSELAGE: The fuselage in this kit has been accurately machine shaped and hollowed. Your work will consist of mounting the engine, ignition system and controls within the finished shell. Engine mounting will vary slightly with the different engines, but a typical set-up is shown. It will be necessary to bolt the landing gear to the bottom of finished motor mount before glueing mount in place. Landing gears are then pushed thru slots in fuselage as engine mount is lowered into place. Before glueing engine mounts, and installing ignition units, it is necessary to give inside of fuselage three coats of dope to prevent model from becoming oil soaked.

Top fuselage half may be either cut out to fit down over the cylinder of the engine, or may be divided into a nose and tail section as the builder desires.

A slot must be cut in the tail of the top half for placement of the Vertical fin, and also the slots on each side must be cut as shown on the plans to accomodate the Elevator and Stabilizer and the notch must be cut as shown in detail view to limit the action of the controls. After ignition units and tank have been mounted in lower shell, the Control Wire guide tube is firmly cemented in position to insure Control Wire clearance.

WING: An accurately constructed and smoothly finished wing will add greatly to the speed of your model. The air foil section used was developed to give sufficient lift and an absolute minimum of drag. It is advisable that you duplicate it as accurately as possible.

Draw center line along leading and trailing edge of wing blank to use as guide in your carving.

Cut out the cardboard Wingfoil Templates accurately and use to slide over wing to determine the airfoil. Wing is fitted to fuselage after it is completely shaped and sanded. Plywood control guide plate is securely glued in slot cut in wing as shown. It has been found that 1` positive wing incidence is correct for the large class C engines, while 3° positive incidence is needed when flying model with .29 - .45 cu. in. displacement engines to avoid necessity of flying plane in a nose high attitude.

TAIL SURFACES: Pine strips are cemented to the hinged edges of the stabilizer, to make a solid anchorage for the hinge. This is done before the horizontal tail plane is shaped and sanded. After sanding the hinge may be glued in place, countersinking the wire through the Pine into the balsa to make a smooth surface.

An .040 Aluminum control horn is then bolted and cemented to the top of the elevator, and one of the small drilled lugs is bent at 90° and fastened to the bottom of the elevator with the same bolt securing the horn. The control spring is fastened at one end to this lug and at the other end to a similar lug fastened to inside of fuselage shell as shown on plans. The stabilizer is then glued to the lower fuselage shell.

The Vertical Fin is then sanded to a smooth streamline section and a portion of the lower edge is cut out to make room for movement of the control horn. The exact measurement of this cutout may be determined after the fin has been fitted to its slot in the top of the fuselage. Make certain that this slot in the top section of the fuselage is true and straight, with NO offset, before gluing Fin in place. The tail cone should then be cut and sanded to complete the contour of the fuselage and cemented to top half.

FLYING: Regardless of whether you install the control as shown, or your own special favorite, the plane should be flown in a clockwise direction. This will enable the engine torque to hold the ship out at the perimeter of the circle without the aid of an offset rudder. When using the spring loaded control, the control line anchored to the screw-eye carries the main stress load and for this reason should never be less than .014 steel wire."

Direct submission to Outerzone.

Quote: "Hi Steve, Attached is the plan for the Hell Hammer. Another one set up for clockwise rotation, and shown with a spring loaded elevator to get around the Walker patent.
regards
Richard"

Supplementary file notes

Airfoil templates.

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