Grumman Skyrocket - Stand-off scale RC model twin.
Quote: - "The Grumman XF5F-1 Skyrocket was a radical approach in the development of Navy air power. Orders were issued in June, 1938 for this new twin engined shipboard fighter. This at a time whe: biplanes were the king of the fleet and monoplanes were just coming into use.
It was first flown on April 1, 1940. Performance was good, but cooling and airflow problems led the way to a long series of development modifications. An extended nose, fillets and nacelle improvements were made. Landing1 gear failures added to development problems. The "Skyrocket" was written off in December, 1944 after a landing gear failure at Floyd Bennet FieM in New York. Wing span was 42 feet, top speed 383 mph and a rate of climb of 4,000 feet per minute, which probably attributes to the name Skyrocket. While only one XF5F-1 was built, the development work on it paved the way for the very successful F7F Tigercat.
The Skyrocket is the type of plane you either like or you don't. It's unique snub nose, or rather no nose appearance and big radial engines is either appealing or appalling, depending on your taste. I have always been intrigued by this air plane and decided it was time to build one. I sized it to suit a pair of Wankel .30's, however any good reliable pair of .29 to .40 engines would do the job. The span is 58in and wing area totals 585 square inches.
Ready to go my Skyrocket weighs 9 pounds, giving a wing loading of about 35 ounces per square foot. This is kind of heavy loading for a sport flier, but the Skyrocket was not built for everyday pleasure flying. A complex twin engine model just can't be considered a sport plane. Ample power, a well forward center of gravity and a generous amount of wash-out in the wing tips all help to make the Skyrocket perform reliably.
Dependable engines are of the utmost importance! The engines are quite far apart, although the absence of a nose make them look even wider spaced than they are. Add to this the large cowls with their resultant high drag and it isn't hard to imagine the single engine performance. In a word, risky, a trait not unique to the Skyrocket alone. I have not seen a scale twin engine model other than those with tandem, push-pull, engines that was not in trouble to some degree when an engine quit. An exception might be some flying boats such as the Catalina.
Pointing the engines outward, about 3 or 4 degrees, can help. I didn't do this on my model, but if you build it you may want to.
I went all out and included flaps and retractable landing gear. Rhom Retracts were used with excellent results and this system must be one of the most reliable available. The Rhom main gears can be made to retract back by simply rotating the legs 90 degrees and mounting them as you would a nose gear..."
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Article pages, thanks to RFJ.
Article pages, thanks to RFJ.
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