A-4P Skyhawk (oz11664)
About this Plan
A-4P Skyhawk. Profile Carrier CL model.
Direct submission to Outerzone.
Update 23/07/2021: Added article, thanks to rrfalcon on HPA.
Quote: "When the Douglas A-4 Skyhawk was featured in the September 1971 issue of AAM, I was thinking about a new Profile Carrier plane to replace my veteran of the past season. I had thought about the Skyhawk before, since many Navy TA-4s come into Williams AFB, Arizona, where I am stationed, and the design appealed to me. The A-4 article and three-views convinced me that was the way to go.
My previous ship had been built to test my ideas on Profile Carrier design. My theories were apparently sound since that model received four firsts and one second out of six contests entered, but that model was not patterned after any particular Navy plane. In fact, it was downright ugly, and I always felt a touch of shame when seeing some of the other profiles that looked like real airplanes. With this touch of shame and my theories in hand, I set out to design the A-4P ('P' for profile). A quick glance at the plans shows that the wing and fuselage are not built to the same scale relative to the real aircraft, but the plane is easily recognized by anyone familiar with the real Skyhawk.
Since Carrier flying consists of both high speed and difference between high and low speed, there are two routes to increased scores: Increasing top speed or reducing slow speed. Improving top speed with the same slow speed capability will result in a four-point increase in score for every mile per hour added. Decreasing slow speed will result in only three points gained for every mile per hour decrease. Additionally, consider that a one mile per hour change in speed amounts to just over 1% change in top end but is more than a 4% change in slow speed. For these reasons, I like to concentrate on high speed and let slow speed come as it will. A look at the scores for the top finishers in a Profile Carrier event will usually show that slow speeds are fairly consistent while the top speeds determine the winners. This is particularly true on windy days when slow flight is most difficult.
In the scale Carrier classes, speed is determined largely by the engine; in Profile, however, engine differences are fairly well legislated out. About all that can be done for a plain bearing 35 is to free up and polish the main bearing and mount the engine as securely as possible to reduce vibration. With engine differences reduced, the airplane is the next choice for increasing top speed. This is done by reducing drag and weight.
Since much of the high speed run depends on acceleration, the lighter model has a definite advantage. Additionally, a lighter model should be able to fly slower since the wing will have to produce less lift. Selection of wood is very important to reducing weight. In the A-4P the only medium weight balsa required is in the center ribs (R3, R4 and R5), the leading and trailing edges..."
Supplementary file notes
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
Douglas_A-4_Skyhawk | help
see Wikipedia | search Outerzone
ScaleType: This (oz11664) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.
If we got this right, you now have a couple of direct links (above) to 1. see the Wikipedia page, and 2. search Oz for more plans of this type. If we didn't, then see below.
ScaleType is formed from the last part of the Wikipedia page address, which here is https://en.wikipedia.org/wiki/Douglas_A-4_Skyhawk
Wikipedia page addresses may well change over time.
For more obscure types, there currently will be no Wiki page found. We tag these cases as ScaleType = NotFound. These will change over time.
Corrections? Use the correction form to tell us the new/better ScaleType link we should be using. Thanks.
Do you have a photo you'd like to submit for this page? Then email email@example.com
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, 2011-2022.
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.