Alley Cat (oz9992)
About this Plan
Alley Cat. Radio control sport model for .10 - 20 engines and 2-4 functions.
Quote: "38 inches of spitting fury for .10 to .20 engines, designed by Harry W. Gilkes
Why Alley Cat? Well an alley cat, the feline type, is usually a tough little character who will take on anyone who ventures into its territory. That description fits this 38 in package of balsa, film and radio gear - especially with an OS15 FP (ABC) up front. Then it will challenge - and most times 'see off' - your average Club 40 sports model, both in speed and its aerobatic capability.
History: Over many years of building and designing for R/C I have always been intrigued by the challenge of producing a really good small model. This has resulted in a few what might be termed 'average' aircraft, a couple or so of what I call good designs, and quite a few of 'well it flies' packages.
Over the years the improvement by lower weight and smaller size of general R/C equipment, together with lighter overall finishing techniques (Solarfilm, etc), and vast improvements in small engine performances have, in all, given a far better base formula to work from. With regard to modern power units, I have also had satisfactory and promising results using the new generation small four-strokes in 38-40in aerobatic models - but that's another story for a later date.
Despite the improvements in equipment we still had the design task of holding the engine, R/C gear, etc together, and defying gravity - in other words, the airframe. After many spare moments at work and home, doodling outlines, packages, structures, and pushing calculator keys, the concept of the Alley Cat family was born; the requirement being to provide a modern day Ugly Stik (oz5175) concept of fun aeroplane. I also decided to utilise to the full, standard 36in wood lengths (who said, but it's 38in? - read on non-believer); a one piece airframe for both maximum space package to bury the gear, etc, also accurate line up and strength/ weight ratio. (Fingers crossed, my calculations would be right!).
With recent reductions in servo costs, the use of mini servos is not as prohibitive as a few years ago, so the formula arrived at really requires at least one mini for full house; two is better, but the combinations of radio and power variations are many. and indeed suit all pockets. However, the airframe construction is not relative to number or type of servo used, so let's get on with the 'wood chopping'.
Construction: First step is to make two templates - one of the full wing section outline. This can be cut from card, and the usual 1/16 ply template for wing ribs (there are only 16!). Pin all blanks together, sand and razor saw cut half depth spar slot. Kit the remaining wing parts to sizes on plan and commence the wing build. First pin down bottom 1/16 trailing edge..."
Direct submission to Outerzone.
Update 24/04/2018: Added article, thanks to RFJ.
Update 30/04/2020: Replaced this plan with a clearer version, thanks to RMC.
Supplementary file notes
Previous scan version.
Did we get something wrong with these details about this plan (especially the datafile)?
That happens sometimes. You can help us fix it.
Add a correction
Do you have a photo you'd like to submit for this page? Then email firstname.lastname@example.org
User commentsNo comments yet for this plan. Got something to say about this one?
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.
© Outerzone, 2011-2021.
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.