Flip (oz12508)

 

Flip (oz12508) by Dick Sarpolus from Model Builder 1976 - plan thumbnail

About this Plan

Flip. Control line 1/2A model.

Quote: "The Flip, by Dick Sarpolus. A fine project for any young modeler. Helps to get the feel of cutting, sanding, and finishing balsa wood. All parts easily cut from sheet stock no fancy shaping required. And oh yes, it flies great, too!

This very simple 1/2A model is a practical, capable stunter. It will per-form all the pattern maneuvers - not quite like a 'real' stunt model, but well enough for fun flying, and it offers some advantages as a stunt trainer. Our Flip was designed to see if it was possible to work within the limitations of using all sheet balsa, simple construction techniques, and still get a ship that would perform the pattern maneuvers well enough for a skilled flier to enjoy, or for a beginner to learn the maneuvers.

The May 1975 MODEL BUILDER issue had a 'real' 1/2A pattern ship, the Gremlin (oz4699). That was built just like the big ones; flaps, thick airfoil, built-up wing, full fuselage, etc, and it is the way to go for competitive performance in a small package. We wanted to get most of that performance with a model that could be built quickly . say, one hour or so. Experience with .049 engines made it obvious that Cox engines, in particular the Tee Dee or Medallion .049's, had ample power for good performance. Experience with the typical plastic ready-to-flies, and many of the all balsa kits on the market, showed us that they will fly but sure won't do for stunt capabilities. We believed the big problem was size most 1/2A designs just don't have the wing area necessary for good aerobatic performance.

Aside from the model, those dacron flying lines have got to go! Just too much drag and stretch. Going to 35 foot, .008 or .012 stranded cable lines make a tremendous performance difference. One other design consideration was the landing gear - or lack of one. We fly almost exclusively over grass, where a landing gear is useless, as take-offs and landings can't be made with small wheels. Grass field flying also permits hard landings; the straight-in full bore type, usually with little or no damage. So we left the landing gear off and gained more performance.

The model ended up with a 27 inch span, 130 square inch wing area, and 20 inch length. And for us at least, the performance is pure fun. Speed is high, too high for really smooth flying, but fun. Perhaps a reed valve engine like the Cox Black Widow or Golden Bee would give a more restrained performance; we show a mounting on the plans but have not tried that version. Speed does make it harder to learn the maneuvers, and there is a case for learning on a larger, .19 to .35 size, built-up ship. But a mistake with the larger craft gives you a broken plane; the .049 all-balsa model will usually bounce back for more, or can be 'Hot Stuffed' back together right away. Performance in a reasonable wind is not a problem with this small ship; line ten-sion is good. The Flip has no difficulty with vertical and overhead eights.

Material selection was interesting - with an all wood wing we know we couldn't get much of an airfoil, so instead of trying to sand and carve an airfoil from 1/4 inch or thicker wood, we went to an absolute flat plate, 1/8 inch thick wing. It can flex while flying, is amply strong, and yes, it works. Tail surfaces are also 1/8 inch; more rugged than 1/16..."

Direct submission to Outerzone.

Update 05/10/2020: Added vectorPDF and CAD (dxf and dwg) versions of this plan, thanks to Valeria367.

Quote: "Hi, Steve and Mary. Good afternoon. Some days ago, I started the redraw by CAD of the plan "Flip" by Dick Sarpolus (oz12508) and, surprisingly, you published that plan two days
ago!... What a coincidence! Right, as usual, I send you the plan in PDF vector format, as well as in both CAD vector formats; DWG and DXF.
Greetings, from your friend. Valeria367"

Supplementary file notes

Article.
VectorPDF plan tracing.

CAD file

This plan is available for download in CAD format.

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

Flip (oz12508) by Dick Sarpolus from Model Builder 1976 - model pic

Datafile:
  • (oz12508)
    Flip
    by Dick Sarpolus
    from Model Builder
    March 1976 
    27in span
    IC C/L
    all formers complete :)
    got article :)
  • Submitted: 13/09/2020
    Filesize: 323KB
    Format: • PDFbitmap • PDFvector • CADfile
    Credit*: MB2020, Valeria367

Flip (oz12508) by Dick Sarpolus from Model Builder 1976 - pic 003.jpg
003.jpg
Flip (oz12508) by Dick Sarpolus from Model Builder 1976 - pic 004.jpg
004.jpg

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

User comments

No comments yet for this plan. Got something to say about this one?
Add a comment

 

 
 

Download File(s):
 

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, 2011-2020.

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.