High Q (oz1548)


High Q (oz1548) by Jack C Port from American Modeler 1954 - plan thumbnail

About this Plan

High Q. AMA National Championship RC winner. High-Q model designed by Jack C Port. Drawn by Frank Zaic. 55 in wingspan, 485 square inches wing area. Competition winning radio control model.

Published in AM 1954, this plan was also later reprinted in MB 1990. See supplement file for later MB article.

Quote: "The National Championship R/C Winner. What's needed in a model to win? One chap who knows: the Champ himself. High-Q, by Jack C Port.

High Q is not a completely new design, but rather my latest attempt to incorporate desirable features that would produce a better model for radio control contest work. Actually, the design is based on experience gained by flying other ships at contests and taking note of the scoring deficiencies present. Probably the most important factor in the design of a radio model is the type of basic control to be used. Because of past experience in flying and adjusting the basic escapement rudder control configuration, the design here was centered around the improvement in performance of this simple but effective method of control.

If we analyze the AMA radio control flight rules, combined with general contest conditions, certain ideas for development are evident. First, the model must be fully stuntable, yet adaptable to the type of weather conditions encountered.

As I have noted in the past, a lot of good models were at fault in the wind. Usually because of light wing loading and inadequate power the model, although capable of the stunt pattern, was prone to be lost downwind due to the lack of penetration. Actually penetration is the property of high air-speed combined with good longitudinal stability and the degree of its use is primarily controlled by power and wing loading factors.

If we attempt to increase the penetration factor in any given model of light wing loading (12 to 14 oz/sq ft), we must increase power, move CG aft, and reduce angular difference between wing and stabilizer. Usually before the desired airspeed is reached, a condition of longitudinal instability appears. Sometimes the model will tend to 'tuck-under,' especially if airspeed is increased more by a spiral dive in an attempt to begin a maneuver. This is basically a result of flying the wing at too low an angle of attack, which causes the center of pressure to move aft, creating a nose-down tendency. Also, due sometimes to poor wing structure, the increased airspeed will cause a certain flexing that lessens even more the angular attack, thereby exaggerating the tuck-under condition in model.

Although the tuck-under condition may not be to the point of complete danger, with respect to crashing the airplane, it will minimize the property of stunting the model. A nose-up tendency proportional to the increased airspeed is desirable in any rudder-only model. This is the basic element that allows a rudder-only ship to enter and complete a maneuver. Therefore, in the desire to increase the penetration factor, and still maintain good stunt quality, we must increase the wing loading and power, so the angular flight difference between the wing and stabilizer is greater.

Another factor equally important in obtaining good penetration, combined with stunting quality, is the selection of the proper wing and stabilizer airfoils. The flat-bottomed, medium-lift section is desirable for the wing, because it must be flown at higher airspeeds to create sufficient lift for the wing loading. Also, it is less prone to aft center of pressure travel when used at low angles of attack, thus minimizing the tuck-under condition..."

Update 12/02/2019: Added article, thanks to RFJ.

Update 09/04/2020: Added article from Model Builder June 1990 (nostalgia feature), thanks to RFJ.

Supplementary file notes

Article (MB).


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

High Q (oz1548) by Jack C Port from American Modeler 1954 - model pic


High Q (oz1548) by Jack C Port from American Modeler 1954 - pic 003.jpg
High Q (oz1548) by Jack C Port from American Modeler 1954 - pic 004.jpg
High Q (oz1548) by Jack C Port from American Modeler 1954 - pic 005.jpg
High Q (oz1548) by Jack C Port from American Modeler 1954 - pic 006.jpg

Do you have a photo you'd like to submit for this page? Then email admin@outerzone.co.uk

User comments

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



Download File(s):


* 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, 2011-2021.

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.