About this Plan
Kerswap - Half-A Texaco pylon-type gas free flight model. This is later re-design of the original 1941 model.
Quote: - "Here's a 1/2A Texaco Old Timer with an impressive contest record and straightforward construction. An ideal combination for newcomers to the Old Timer scene.
The KERSWAP was designed by Gil Morris, who built three of them in 1941-1942. Originally powered by an Ohlsson .19, the 288 square-inch airplane must have been a 'bomb'. In 1982, the NFFS Digest reported that a Kerswap was being flown (freeflight) in the California area powered by a rare Ohlsson 33; that one had to be even more spectacular. Rumor has it that the Kerswap was named for the sound it made when augering in; as Gil is still around, and an active freeflight competitor, I plan to check out the rumor.
The Kerswap is a straightforward, simple airplane. In its original size, it is almost ideal for conversion to 1/2A R/C Texaco. To keep the airplane weight down, I changed some of the wood sizes from the original; but the Kerswap, as presented in this article, conforms to the original in planform and size. The Kerswap has minimal frontal area and a surprisingly thin undercambered airfoil when compared to other Old Timer airplanes. Both of these factors contribute to its ability to penetrate into the wind. Because the wind blows all of the time in Texas, it is important to build airplanes that can cope with that problem.
The airframe is about as simple as you can get (allowing for the elliptical flying surfaces). Although I am a notoriously slow builder, the airplane constructed for this article was built in two weeks of part time (evenings) effort. At about this time in most construction articles, the author states that "I am not going to bore you with the details of how to glue A to B". If you have read this far, you are in for a surprise! I fully intend to describe the construction process, as this airplane may be attempted by a first time builder.
The fuselage is constructed almost entirely of 3/16-square balsa strips. Try to pick out four fairly firm pieces for the main longerons, the remainder can be built from medium light stock. I normally jig-build my fuselages to keep them straight; this is accomplished on the Ker-swap in the same manner that wooden ribs are constructed for full-size aircraft. Using a flat, wooden building board, tape the plans to the board, cover with waxed paper, and proceed as follows..."
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
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, 2011-2019.
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.