February 1972 American Aircraft ModelerTable of Contents
Some things never grow old. These pages from vintage modeling magazines like American Aircraft Modeler, American Modeler, Air Trails, Flying Aces, Flying Models, Model Airplane News, & Young Men captured the era. I will be glad to scan articles for you. All copyrights are hereby acknowledged.
The Cheechako, which is named after what a newcomer or 'tenderfoot' was referred to in Northern Canada and Alaska, is an entry-level rocket boost free-flight glider. The name fits perfectly with the monthly "For the Tenderfoot" series that ran in the AMA's American Aircraft Modeler for many years. Cheechako uses what was at the time the second-smallest Estes rocket motor, the 1/2A6-2, for power. The thrust and engine run time were minimal, and there was a 2-second delay time before the ejection charge was fired to eject the heavy motor casing out of the back of the mounting tube. I had a Falcon rocket boost glider as a kid and loved it since the configuration allowed me to combine my other other indulgence: model airplanes (hence, the name of this website).
See January 2014 update.
For the Tenderfoot: Cheechakoby Larry Renger
A "Cheechako" is a tenderfoot in Canada and the northern fringes of the United States. This model was specifically designed for this magazine's series of easy to build and fly models. It is not an "off-the-shelf" design which sort of fits the slot. The design goals which were set up before pencil hit paper are: (a) no critical shaping or carving; (b) built-in alignment and trim; (c) warp-proof construction; (d) no moving parts or critical tolerances; (e) good performance. In other words, try to design an AMA Delta Dart for rocket power, only more so.
Cheechako meets all these goals and even manages to look sharp as an added feature. The use of a flat construction, delta planform wing with preshaped trailing edge stock is the secret to the success of this model. I went through (and I mean THROUGH) several prototypes to get the trim to the "off the building board" stage. If your model is built exactly to the plans and balanced where indicated, it should fly too.
The basic construction sequence, shown on the plans, is self-explanatory, so we will just hit a few details here to help make your model perfect.
Cut each stick slightly oversize, then trim down to fit its space smoothly. Fit and trim till each part is right; don't hesitate to throw out a part if it is cut too small.
Use white glue or Titebond - but sparingly! Smear a thin film of glue on each part where it is joined, then slip the parts together. Sand the basic frame flat, using 220 grit paper and a sanding block. (A small plastic box works well for a block.)
The proper tissue technique is as follows: (1) Apply two coats of dope to all parts of the model where the tissue will touch it. Sand very lightly after each coat with 320 or 400 grit paper. (2) Cut the tissue oversize, using "Jap" tissue only! (Your hobby dealer will carry this product.) The grain runs along the wingspan. The paper will tear more easily along the grain to test which way it goes. (3) Lay the tissue on the model and very lightly tack it down with raw thinner. You can make it go around corners easier on the edges by dampening that part before sticking it down. To final trim the tissue, use a new razor blade - no knife blade comes close to that sharp edge. Shrink the tissue with water spray or gently brush the water on.
It says it on the plans, but it can't be overemphasized: GLUE THE RUDDERS ON STRAIGHT!! The pod alignment should also be accurate. The pin holes through the tissue, shown on the plans, allow the glue to make a good wood-to-wood bond. The foil protector strip can be ordinary household aluminum foil stuck down with rubber cement.
Flight should be pretty good "off the board," but here is what to do to fine-tune your model. First, check the balance - it should be exactly 4 1/4" from the nose point of the wing. Fly the model with a 1/2A6-2 engine to start with. It should go up straight with perhaps a slight roll. If the model loops seriously, trim the trailing edge narrower in the center. (You got some with a steeper than normal angle carved in.) For a slight arch-over on the way up, tweak just a little turn into one rudder to make the model roll on its upward travel.
The glide should be smooth with a wide turn. Warp the rudders to add or remove turn. Move the CG back and forth to achieve a smooth glide just on the edge of the stall. The model may tend to stall more near the ground due to turbulence. Don't readjust to cure this, it is normal.
Cheechako Rocket-Powered Glider Plans
<click for larger version>
The AMA Plans Service offers a full-size version of many of the plans show here at a very reasonable cost. They will scale the plans any size for you. It is always best to buy printed plans because my scanner versions often have distortions that can cause parts to fit poorly. Purchasing plans also help to support the operation of the Academy of Model Aeronautics - the #1 advocate for model aviation throughout the world. If the AMA no longer has this plan on file, I will be glad to send you my higher resolution version.
January 19, 2014 Update:
Über rocket boost glider builder David Wagner sent me this note and photos of his excellent Cheechako. David has established a unique "signature" finishing scheme on his models that consists of a solid red and/or white base with aluminum foil in a decorative pater in the rocket motor exhaust area.
Photos of the Cheechako rocket glider I built from plans on your site. It weighs 5.75 grams as shown here. It was tremendously nose heavy as built from plans, so had to change to the small Estes 'T' size motors, which are about half the size of regular motors. Also had to make a much shorter nose cone, hollowed out, and move the whole nacelle back a half inch. Also added dihedral. With this configuration, it glides very nicely and is quite stable. Like any delta, I suspect it will be sensitive during transition, and to even light breeze. Too windy to fly Saturday, but will try again next Saturday.
See all of David's rocket boost gliders:Cheechako
Posted January 27, 2013