Eager Eagle (oz5169)
About this Plan
Eager Eagle. Free flight power model, for Holland Hornet engine.
Quote: "Designed and tested for the 1959-60 AMA free flight rules, by Frank Ehling. EAger Eagle.
This year the free-fright competitions should prove keener than ever. The increase in weight under the new rules encourages new construction techniques and more rugged models better able to withstand the rigors of contest flying. The added lumber used in bringing these up to the required weight will cost a pretty penny - if the trend toward large models were to continue.
But do we really need a big model to win contests? Time after time we all have seen smaller models turn in maximums and many a small job has walked off with the hardware in free-for-all, combined classes events. 'Eager Eagle' has demonstrated that it can compete or a par with the largest. It also offers the lazy lad an opportunity to compete it two events, A/2 and A, with the same model. This by merely changing engines. No readjustment is necessary.
We realize some argue against such a feature; we readily agree that for com-petition purposes it is far wiser to have two identical models on hand in case a replacement part becomes necessary. But this has been quite expensive and time-consuming where the big jobs are concerned. Building two smaller models such as Eager Eagle will actually take less time and money than one large model. Then, too, it is easier to adjust.
Actually this craft was built and thoroughly test flown last fall, even though we felt that its all-up weight of 8 oz might be too much of a handicap in competition with the lighter 5 oz jobs with the same wing area. However, during these flights, the extra weight went unnoticed by everyone who watched its almost straight-up, really moving climb. This year it was only necessary to add an additional half ounce weight. But thanks to Bob Holland's Hornet and its timer tank which streamlines in neatly, the climb continues just as hot.
The wing and stabilizer are multi-spar with husky leading and trailing edges to take the brunt of rough landings. The fuselage is sheet, with the cabane pylon running down to the bottom and reinforced with sheets of 1/8 in making the nose section solid. The rudder is reinforced in a similar manner. While our original craft was tissue covered, we recommend light silk or double-tissue covering on the wing. This will make an even more durable model and should bring the model up to 'new rule' weight.
Construction begins with the fuselage. Cut out all required parts. Cement filler sheets to cabane and rudder. Lay one fuselage side on a flat surface and cement cabane and rudder assemblies to this. Add formers and other side. Cap top and bottom making sure all seams are well cemented. Loose seams on a fuse-lage as thin as this will allow it to twist under power and thus make adjusting quite difficult.
Nacelle sides are carved from solid balsa blocks. If the blocks are first lightly cemented to a 'filler' sheet the same thickness as the cabane they more easily can be carved and sanded to a uniform shape. After sanding split them apart and cement them to the cabane. Push the wing tie-down wires in place on the nacelle-wing mount and cement well. Cut out plywood firewall, secure Hornet retaining plate to it. (An alternate method is to solder the nuts to a piece of tin or brass and cement this to the rear of the firewall.) It will be necessary to hollow nacelle face so firewall fits flush. Check to see that nuts do not offset en-gine in any way. Engine mounts with no side or down thrust.
Add plywood wing-stabilizer plat-forms. Note stabilizer platform is tilted - this should be done at this time. Tilting the stab by inserting shims under one side can be done, but should a shim fall out during flight, the entire flight pattern will be alerted.
The dethermalizer wire set-up shown has proven very efficient; it acts as a spring to help 'pop' and limits the de-thermalizing angle. Sand rudder to streamlined shape. Go over entire fuselage with fine sandpaper. In doping your model start right off with... "
Direct submission to Outerzone.
Update 07/06/2019: Added article, thanks to RFJ.
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