A-Pay (oz10825)


A-Pay (oz10825) by Frank Ehling 1954 - plan thumbnail

About this Plan

A-Pay. PAA-load competition model for Torp .19 engine.

Quote: "A proven contest winner, a pleasing configuration, pleasure to build. A-Pay, by Frenk Ehling.

Since its total weight and drag will determine the performance of a model, you must consider these two factors when selecting wood and finishing that model.

With a Torp .19 swinging a 9 x 4 prop, A-Pay climbs almost vertically. Select light wood for the stabilizer and rudder; go easy on doping from the dummy to the rear of the model. If the model stalls do not change the angles of the wing and stab; tilt the stab to obtain a left glide circle and then if it is still stalling, move the dummy forward.

To start, lay out the fuselage sides; cement all joints well, leave the sides down until thoroughly dry. Cut impact absorption bulkhead and use as a guide for cementing sides together. Cut the pylon bulkheads and assemble plyon. The firewall can be cut and drilled and then cemented in position. The nose is sheeted along with the pylon. The wing platforrn is cemented in place. Trailing edge stock is cemented to the fuselage top for the stabilizer stop. Add the wing hooks, cement well. The nose is strengthened with gauze cemented around the firewall. The nose plate and gear are made up and bolted in place. The rudder is of sheet and cemented to the fuselage. Sand the edges round.

Cut the wing ribs and assemble wing over full size plan. As there are no gussets at the dihedral breaks, cement the spars well at each joint. Sheet the wing and cap the ribs to add strength. This sheeting can be soft. Add the tips and sand to shape. Complete building details are available on the full-sized plans."

From scans hosted at https://rclibrary.co.uk/title_details.asp?ID=2346 thanks to Mary.

Direct submission to Outrerzone.

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

A-Pay (oz10825) by Frank Ehling 1954 - model pic

  • (oz10825)
    by Frank Ehling
    from Air Trails Annual
    58in span
    IC F/F
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 18/01/2019
    Filesize: 724KB
    Format: • PDFbitmap
    Credit*: Mary, Pilgrim
    Downloads: 395

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

User comments

After looking at the drawings and reading the article I found that there is no information regarding the location of the CG. Based on the data of other models of the same class (CG at 75% - 83% of the leading edge) I guess that we can position the CG where the position of former "E" is marked on the drawing, which is about 80% from the leading edge. What do you think about it?
Sluchaen - 23/04/2024
Go back and look at one of the Ramrod models, a popular design from the same era. Its CG is also waaaay back from what we would ever try, but that's where it had to be. I had the same problem with my Comet Sparky, also an old design. CG was not shown on the plans, but others who had built it said 75%. I didn't believe them and set mine at 50%, turned out to be a whole lot nose heavy. I added weight to the tail until it flew right, later moved servos back so I could get rid of the weight. Notice the Ramrod has a LOT of downthrust, and it will still pull it straight up. Suggest you try downthrust also. My buddy Joey had a Ramrod 600, about the same size, with a Fox 35, flew perfectly from the first flight. I'm assuming you will be flying it free flight like it was designed. If converted to RC, all bets are off. The Ramrod flew in tight right hand circles until the timer cut the engine, then transitioned into a smooth glide, totally different from what we would fly RC. It's a different world.
Doug Smith - 24/04/2024
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, 2011-2024.

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.