Unlimited (oz9684)

About this Plan

Unlimited. Control line stunt wing for 1.5cc - 3.5cc engines.

Quote: "At the time this model was thought out - the winter of 1948/9, stunt flying was at the 'looping and wingover' stage with the Worcester Club; bunts and inverted flying usually met with unenviable results.

This machine, then, was primarily designed as a fully stuntable training aircraft able to perform the whole stunt schedule and yet be strong enough to withstand the inevitable crashes which occur during the training - and more advanced - phases of stunt flying, ie to withstand a vertical dive taken to the usual bitter end.

The choice of a flying wing for this purpose had not then been made, but when the following requirements were considered, such a type of model became the obvious choice:

(1) Wing loading must be low.
(2) Flying speed of about 50mph.
(3) High manoeuvrability.
(4) Preferably a symmetrical layout.
(5) Capacity to withstand heavy punishment.
(6) Building to be simple and straightforward.

Experience with free flight wings had shown that most of these factors are inherent features of that layout. Virtual elimination of a fuselage would obviously reduce wing loading as compared with an orthodox machine. Alternatively, sturdier construction could be adopted without increase in comparative wing loading.

A characteristic of most tailless models is their relatively high flying speed and, as a C/L job would not require washout, drag would be minimised. A feature of badly trimmed free flight wings is their ability to perform flick loops at the least provocation. If this vicious tendency could be suitably harnessed, it would certainly ensure responsive control and high stuntability.

A symmetrical layout could obviously be attained without difficulty, while speed and simplicity of construction would depend on general layout and good practical design. One apparent constructional advantage, however, would be the relatively small number of components.

From these pointers emerged a layout almost identical to that of the model as finally developed and illustrated in these pages.

Diesels being more reliable than Glo-plug for stunt work, and a motor of 1.5 to 2 cc being desirable for economic operation, and Elfin was delegated to be the power unit for this aircraft. Proportions of the wing were then decided accordingly..."

Scan from DBHL, cleanup by theshadow.

ref DBHL-7251.

Direct submission to Outerzone.

Update 17/01/2018: added article, thanks to hogal & RFJ.

Update 17/01/2018: added PDFvector plan tracing, thanks to hogal.

Supplementary file notes

Article.
PDFvector plan tracing (hogal).

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