FlatCat (oz7094)

 

FlatCat - plan thumbnail image

About this Plan

Flat Cat. Simple rocket boost glider model.

Quote: "Last month covered the basic principles of boost-glider design. The FlatCat applies them to a simple beginner's BG. Behind it is three years of development and flight testing. FlatCat, by Harry Stine.

Last month we talked about the basic principles of boost-glider design. Lest anybody get frightened over the possible complexities involved in BG work, and in order to develop greater interest on the part of both rocket and aeromodelers in this fascinating sector of model rocketry that overlaps more than a little into model aeronautics, one should follow up the 'why' with the 'how,' which is just what we're going to do.

Most of the seven BG kits now on the market as of this writing are reasonably easy to assemble and will perform quite well Some are easier to modify for com-petition than others, but all must be modi-fied to conform with the NAR rule re-quiring 36 sq. in. of streamer or parachute area per ounce of jettisoned weight. Most of the kit jobs are too small, giving them a strong tendency to go bye-bye with high-powered engines. And they aren't normally amenable to controlled experimental modi-fications.

The late Charles Duelfer of Stamford, Conn. suggested to me in 1964 that a simple beginner's BG was needed. In com-mon with many other areas of technology,

it often requires a great deal of understand-ing in order to come up with something that is really simple, and simplicity often belies the fact that a lot of head scratching lies behind the whole thing. It took three years to come up with the 'FlatCat,' and I am certain that FlatCat is not the final word.

FlatCat was specifically designed as a BG that could be built easily by beginners while at the same time being suitable for improved competition performance with minor modifications. It is presumed that the builder has constructed at least one streamer-recovery model rocket, that he is capable of making a good glue joint, and that he has enough visual perception and patience to get things more or less lined up. No matter how simple a BG design is, it still takes a wee bit of care to put one together, but the same holds true for a simple chuck glider. Having obtained the parts detailed in the bill of materials, you are ready to start construction, which, if you follow these steps, is simple.

1) Cut wings from 3/32 sheet balsa. Bevel root chord edges with sandpaper and glue wings together with each tip elevated 1-3/4. Use double-glue joint and let dry thoroughly.

2) Cut stab and rudders from 1/16 sheet balsa. Mark center line on both sides of stab. Glue rudders on top of stab tips. Align carefully. Let dry thoroughly.

3) Mark two lines down opposite sides of engine tube. Attach engine holder to top of tube. Install shock cord and glue screw eye into base of nose cone. Install nose cone and streamer in tube.

4) Make pylon from 1/4 x 1-1/2 x 4 in balsa. Cut front end to 45-degrees and back end to 30-degrees as shown in plans. Round front end and taper back end to stream-lined section (optional). Glue pylon to tube on opposite side from engine holder. Align carefully. Glue launch lug to left side of pylon-tube joint. Let dry thoroughly.

5) Mark center line down top and bot-tom of fuselage. Measure and mark loca-tion of wing atop fuselage and stab below fuselage. Taper top of fuselage from wing trailing edge aft as shown. Sand tail of fuselage to point as shown on top view..."

Harry Stine's Flatcat from American Modeler magazine issue 08-67.

Direct submission to Outerzone.

Supplementary file notes

Article pages, text and pics.

Corrections?

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

FlatCat - completed model photo

Datafile:

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

User comments

It is listed as a Jetex plan but it actually uses Estes black powder model rocket motors.
anon - 15/06/2016
Add a comment

 

 
 

Download File(s):
  • FlatCat (oz7094)
  • Plan File Filesize: 118KB Filename: Flat_Cat-American_Modeler-08-67_oz7094.pdf
  • Supplement Filesize: 1259KB Filename: Flat_Cat-American_Modeler-08-67_oz7094_article.pdf
  • help with downloads
 

Notes

* 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.

Scaling

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, 2011-2019.

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.