Twin Pusher (oz8292)

About this Plan

Twin Pusher. Rubber sport twin model.

Quote: "For those of us who have been around long enough to remember, the nostalgic era of the 1920's and early thirties recalls to mind those fabulous rubber powered twin pushers which excited one and all with their tremendous flight performances.

We often get to thinking that the era of the tractor was not so much ushered in by a desire to achieve greater performance, but rather to get more closely aligned to what a real aircraft looked like. The twin pusher is perhaps far removed from the ap-pearance of real aircraft, even if we trace back to a decade or two after they came into prominence.

Our own enthusiasm being revived, we sought to relive some of the memo-rable past by designing building a new twin pusher, and introducing some of our latest thoughts on such designs and rubber-powered model design in general.

The airfoils and general wing and stab construction are in accord with standard practice. The introduction of end plates on the wing tips helps to improve lateral and directional stability: Normally these are inherently poor traits in the twin pusher. The end plates are effective for stability reasons only when they project above the uppercamber. The amount of effectiveness required governs the height of the end plates.

We have also reintroduced the use of hardwood hand-carved thin-bladed propellers. While hardwood propellers were used over a generation ago on twin pushers, the design of the propellers had not been exploited to the extent that it has today.

Combining the old with new offers a little advantage, though admittedly the actual carving procedure may be just a little longer. However, aside
from the viewpoint of maximum per-formance, remember that the hard-wood props will last longer, due to the minimized chances of breakage, chip-ping, or getting frayed and worn through constant use.

For someone who has never built a twin pusher, let us say that until you have you will not be able to appreciate its classic performance characteristics. The slow, steady low angle straightaway climb, followed by the wide-turning shallow banked turns; truly a refreshing change for us old timers and a new and exciting experience for the younger modeller. To top it off, the consistent performance of this twin pusher would prove respectable at any model meet against any of the modern day contenders. So how about it? Clear that board and let's get busy!

CONSTRUCTION: Let's begin construction with, the 'A' frame. For the frame itself, select two pieces of 3/16 x 5/8 hard balsa, if you prefer hardwood 3/16 x 1/2 in should be more than ample. Cut the 1/16 sheet bracing to the full size outline as shown. Join the frame together and then cut the diagonal bracing and nose gusset to shape to complete the frame..."

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