Gismoe (oz42)


Gismoe - plan thumbnail image

About this Plan

Gismoe. Free flght gas model. Wingspan 72in. Area 794 sq in. Class C engine. Weight 56 oz. Single wheel gear. First place winner in the 1947 Nationals.

Quote: "Try this '47 Nationals winner as a change from the usual pylon types. Gismoe, by Jerry Brofman.

IN 1941 the pylon type model was at the peak of its popularity. Now, over six years later, the design of gas models has evidenced little change, if any.

Being a firm believer in the low CLA deep belly type of model, I designed Gismoe with the hope of proving that this type of model can perform as well, if not more satisfactorily, than the pylon type. At the last Nationals this fact was well demonstrated. On three flights during a day that decidedly lacked thermals, Gismoe flew for a total of over 21-1/2 minutes to win first place in the Class C Open Gas Event.

You will notice that Gismoe incorporates in its design an extremely low slung belly, with its CLA behind the wing trailing edge, along with a comparatively short nose moment and long tail moment. This arrangement has been found to produce excellent aerodynamic results, especially with the tremendous power of the new postwar engines. The ship has been successfully flown with a Madewell .49, McCoy .49, Super Cyclone and McCoy .60. At the Nationals the Super Cyclone powered Gismoe to first place.

Nuff said for now - let's get down to building. Before you start actual construction of the model be sure you have scaled up the plans accurately. This is best done with a scale rule and a pair of dividers.

FUSELAGE: The fuselage is built from 1/4 sq hard balsa, in the conventional box method. Begin by building both sides on top of each other. When dry, remove sides and join together using the top view as a template. Bend the landing gear of 3/32 steel wire and bend to the firewall, which is made of 1/8 plywood (be sure to put the wheel on first). Cement this assembly in its place on the fuselage. The 1/4 sheet balsa cowl sides are now cemented into posi-tion; with the cowl block between them. While this is drying, the side and bottom stringers may be cemented in place.

Carve the cowl to its streamline shape as shown on the plans and reglue the entire frame-work. When dry, shave off all excess balsa and sand same to smooth finish.

The fuselage is now ready for installing the ignition system. The plans show the places of the ignition components for balance with the Super Cyclone engine - for an engine of different weight, balance the airplane at a point 50% back of the wing leading edge.

Use multi-stranded, coated, fuel proof wire; and solder all joints. The more work put into an ignition system the better the final results.

WING: Sheet balsa leading edge and cap-stripped ribs are the keynotes of the wing construction. This type of construction has been found to produce a wing with an exceptionally high strength/weight ratio..."

Update: 13/01/2019: Added article, thanks to RFJ.

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