Shoestring - plan thumbnail image

Shoestring - completed model photo more pics (2)

by Carl Goldberg
from RCMplans (ref:157)
January 1966 
54in span
Tags: Scale IC R/C Racer Civil
all formers complete :)
got article :)

This plan was found online 03/12/2011 at:
Outerzone planID: oz1923 | Filesize: 1226KB | Format: • PDFbitmap | Credit*: pd1


About this Plan

Shoestring - Scale radio control racer for .40 power. Jan 1966 RC Modeler. This is the plan as it appeared in the magazine pages.

Quote: "There is something about almost every full scale airplane that makes it sungularly beautiful. Of course, there are many different kinds of beauty. Some are even beautiful in an ugly sort of way, if you know what I mean. But when it comes to the Shoestring, designed by Rodney Kriemendahl, it has always seemed to me that he created a classic beauty fit to stand with the all-time greats.

Our model of the Shoestring, adapted to R/C was begun in the summer of '64 but didn't make much progress until the idea of the miniature Goodyear races began to take hold. By sheer accident, our basic dimensions etc fitted into the Goodyear pattern. The only major change was to thin out the airfoil somewhat.

The original wing span of 54 in and overall wing area of 540 sq in were retained. The additional area (above the minimum required by the rules) might make this ship a bit slower than the fastest, but we certainly didn't want a bomb that only the finest flyers could handle This ship had to be something the average man could fly. This eventually proved to be true. Even I was able to fly it, and when you consider my extremely limited multi time, that's really saying something! For the real hot shot, with blood in his eye to win races, sufficient area can easily be taken out of the middle of the wing to reduce it to the minimum allowed by the rules.

Another factor we kept in mind was that, for most flyers, an upright engine is a simpler deal and more practical to work with in every way. However, we provided room in the cheek cowls so that the engine can be mounted horizontally and completely concealed except that the head would be more or less flush with the outside.

Another consideration was how much dihedral to use. A flat wing like the original would, of course, be scale but would require somewhat greater flying skill to handle than one with a few degrees of dihedral. There again, the choice can be made by the builder. For most flyers, we recommend the 4 degrees of dihedral shown, although the difference in stability probably wouldn't be substantial.

The prototype pictured here was built by Mehlin Smith. He began work as soon as our drawings of the fuselage permitted... "

Supplementary files

Article pages, text and pics, thanks to AugustaWest.


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User comments

Steve, I found the following comment about the Shoestring (ID 1923) in the Feb 1966 issue's editorial, By Don Dewey: -- "You can't get rid of me that easy. I just remembered a note that Carl Goldberg wanted passed on to youse guys that are building the Shoestring, featured in last month's issue." -- "The wing breakaway plate as shown on the plan is 1/2in wide and will break in the vicinity of 45 pounds of pull. This amounts to around 11 G's. However, since it has been pointed out that some fellows may produce far higher G's than contemplated by running the ship faster and making sharper pullouts, it may be advisable to provide for a higher breaking load. Accordingly, Carl recommends that the breakaway plate go up to 1in. Since the holes remain the same, the breaking load with the larger plate goes up to approximately 105 pounds, according to test results. This is better than 25 G's, dad, and if you need more than that, forget it. By the way, the cross member which is 1/4 x 1/2in basswood, should be changed to 5/16 x 3/8 birch. Okay?" -- Don Dewey, Feb 1966, RCM.
davidterrell80 - 11/10/2017
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