Digester

 

Digester - plan thumbnail image

Digester - completed model photo more pics (5)

Digester  
by Don Mathes
from RCMplans (ref:137)
December 1964 
72in span
Tags: IC R/C
all formers complete :)
got article :)


Submitted to Outerzone: 06/11/2014
Outerzone planID: oz6097 | Filesize: 396KB | Format: • PDFbitmap | Credit*: JeffMac

   

About this Plan

Digester - Digicon Tester - Radio control sport trainer model for Veco .45 power.

Quote: - "The Digester is, in many ways, one of the most remarkable models we have ever had the pleasure of building and flying. The finest proportional trainer available today, it will perform the entire AMA pattern with ease. Although the construction is completely straightforward..."

72in span, 1000 sq. in., .45-.61, 4 channel radio. Model # pl-137. Designed by Don Mathes. Featured in RCM 12-64.

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Supplementary files

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User comments

Don Mathes and Doug Spreng have the distinction of designing the very first digital proportional radio available. Big changes were taking place in the early sixties, old reliable tuned reed systems were on the way out and proportional control was taking its place. But none of them worked, that's why you needed a disposable test aircraft like Phil Kraft's Ugly Stik and Don's Digester. Doug Spreng designed the servo circuit for the Digicon system and it was a revolution, orders of magnitude better than anything else. He never patented the circuit and everybody else in the business immediately copied it. In fact, you can take one of his original servos, change the plug and it will work perfectly in a system made today, the basic principle has not changed in 50 years. But the Digicon had a fatal flaw, the trim would change when you got further away from the transmitter, not much but enough to discourage the pattern fliers who bought it. Somebody came up with a modification to cure the problem but it was too late and Digicon folded.
DougSmith - 30/05/2015
The Ugly Stick is probably the most famous radio control airplane in history. Phil Kraft designed it to build fast and be used as a test plane for his digital radio control systems. But this plane wasn't the first test plane for digital radios. This distinction falls to the Digester [more pics 005-007]. While the Ugly Stick appeared in Grid Leaks in May of 1966, The Digester had made its debut in R/C Modeler in December of 1964. Don Mathes designed the plane to test his own radio system, the Digicon, so the title Digicon Tester was shortened to Digester. The Digester is a three channel plane and the Ugly Stick uses four channels. The plane must have impressed Phil Kraft somewhat for he used the airfoil for his Ugly Stick.
JimHales - 08/05/2017
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