Grumman Skyrocket


Grumman Skyrocket - plan thumbnail image

Grumman Skyrocket - completed model photo more pics (3)

Grumman Skyrocket  
by Nick Ziroli
from Flying Models
October 1975 
58in span
Tags: Scale IC R/C Multi Military
all formers complete :)
got article :)

Submitted to Outerzone: 01/07/2017
Outerzone planID: oz8911 | Filesize: 1003KB | Format: • PDFbitmap | Credit*: Circlip, RFJ


About this Plan

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..."

Direct submission to Outerzone.

Article pages, thanks to RFJ.

Supplementary files

Article pages, thanks to RFJ.


Did we get something wrong with this plan? That happens sometimes. Help us make a correction


User comments

No comments yet for this plan. Got something to say about this one? Click here to Add a comment



* Credit field

The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.


This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.


Terms of Use

© Outerzone, 2011-2017.

All content is free to download for personal use.

For non-personal use and/or publication: plans, photos, excerpts, links etc may be used, provided that full and clear credit is given to Outerzone with appropriate and specific direction to the original content i.e. a direct hyperlink back to the Outerzone source page.

Unauthorized use and/or duplication of this material without express and written permission from this site's owner is strictly prohibited. If we discover that content is being stolen, we will consider filing a formal DMCA notice.