Tardon II (oz8342)
About this Plan
Tardon II. Radio control pylon racer model.
Quote: "Attractive non-scale Formula II winner at '69 Nats is also a fine small-size pattern plane.
TARDON II WAS conceived at 20.000 feet over Mexico, while Jack Sabine and I were returning from the 1969 Mexican Nationals. Jack had just won the Open Pylon event with his 'Tardon'. In Spanish, Tardon means slow or pokey. Surprisingly, some of the local Mexican contestants had come over to ask what it meant - seems our dictionary was for Castilian, rather than Mexican, Spanish.
Thinking ahead to the Nationals to be held in Philadelphia, we realized that Tardon needed modifications to fit the recently revised AMA rules. Should new wings be built to meet the rule, or should a completely new plane be designed? The frontal area of Pardon could be reduced by placing the cheek cowls down on the wing like a Rivets, and the wing could be moved up closer to the thrust line. We decided to modify the winning Tardon.
The 1969 Nationals were only days away when the redesigned plane was ready for testing. That first flight was all, or perhaps even more than, a modeler could desire. The ship handled like a dream, and no trim changes were necessary. The only problem was with the pilot, who has a habit of dancing or shuffling his feet during a test flight. Jack was a nervous wreck, but the Pardon made a perfect three-point deadstick landing on our 240-ft, strip.
This plane is fantastic. It demonstrated its high speed capability by qualifying at the Nats with a hot 2:06. Yet, with the engine killed it glides in for landing like a sailplane. It shows no tendency to fall off on a wing during low speed turns and, with the limited elevator throw, it will not stall.
When flying full-bore, the stability is phenomenal. It flies the pylon course as though programmed by a computer. One takeoff during the National finals was made totally blind. Jack's mechanic stood up in front of him just as the plane was released. Jack just pulled up and waited until he saw his orange and white bird over the heads of those in front of him.
Tardon II is an easy plane to fly, even for a beginner. Most Class A fliers would have no trouble handling it. It also can be an attractive acrobatic plane - but fast!
Construction: Construction is somewhat more sophisticated and time-consuming than usual, but it is not difficult. The end results are well worth the effort. If possible, total weight should be kept under 5 lb.
Tail: The stabilizer is simple to build, with 1/16 sheet balsa covering a Warren truss frame. Note that spruce spars are used and that the leading edge is quite tapered. The center of the bot-tom sheet is slotted to allow the stabilizer to slip over the sub-fin. When making this assembly, epoxy the joint thoroughly, since quite a bit of flexing takes place here. However, after a year of flying, our Tardon's joint has not failed..."
Direct submission to Outerzone.
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 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, 2011-2020.
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.