Pfalz Alarm (oz7770)


Pfalz Alarm (oz7770) by Jack Headley from American Aircraft Modeler 1975 - plan thumbnail

About this Plan

Pfalz Alarm. Two channel RC glider model. Pfalz Alarm by W. Headley, from March 1975 AAM.

This design also featured in Aeromodeller Annual 1978, see

Quote: "This model was built to have something different on my local slope. At the time the sky was full of Cirruses (or Cirri) and the like, all aspect ratio and slinkiness, so the challenge was to make something equally good at flying and equally opposite in appearance, Pfalz Alarm was the answer. The main design for a slope soarer in my neck of the woods is a low wing loading. The local wind is a mild sea breeze, that appears in the early afternoon and disappears around sunset. Conditions are best in the spring, which is when I do most of my gliding. From experience, wing loadings in the 8oz/sq ft seem to be ideal. The PA was designed for this sort of weight, and proved to be definitely a good flier, and definitely an ugly model. One problem I had with the original was a built-in warp in the right wing, which had to be steamed out for every flying session. A sheeted leading edge should cure this, and the added weight should be no problem in windier climes. My prototype was finished in transparent red (what else?). I did consider once a powered version of the PA, with twin pusher .049's behind the wing, but other projects got in the way, and it was never completed..."

Quote: "This little fable serves to introduce our non-scale WWI glider - a remarkable subject, as there weren't any gliders in World War I. However, it may not come as any surprise to confess that the Pfalz Alarm is based on the Ugly Stick (oz5175). But, like most of my designs, I sometimes go off base. In fact, I could probably start, with all good intentions, to produce a model of the Bede 5, and end up with something looking like a Junkers JU-87. But, back to the model of the moment.

It's a refreshing change from all the slick, high aspect ratio devices I see flying around my local hill; it's easy to build, and flies just as well as the aforementioned models; so why not have a go? For all of you who've been waiting patiently with balsa knife in hand, here are the building instructions.

CONSTRUCTION. Fuselage: Begin the fuselage by con-structing the basic box from good quality, 1/4 in sq balsa strips. The fuselage sides are first, and here two points should be noted: first, the upper longeron is stepped down at the rear to make a platform for the tailplane, and second, the lower longeron is spliced at the rear, not bent, for the correct rear fuselage taper.

When two identical sides have been made, join them together with the vari-ous frames and, also, 1/4 in sq spacers. After sanding off the gluey bits, pin this box down onto the plan (bottom up) and install the plywood servo mount, which sits on a framework of 1/8 x 1/4 strips. Note: If you are using small servos, then the framework can be omitted..."

Update 05/03/2019: Added article, thanks to RFJ.

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Pfalz Alarm (oz7770) by Jack Headley from American Aircraft Modeler 1975 - model pic


Pfalz Alarm (oz7770) by Jack Headley from American Aircraft Modeler 1975 - pic 003.jpg
Pfalz Alarm (oz7770) by Jack Headley from American Aircraft Modeler 1975 - pic 004.jpg
Pfalz Alarm (oz7770) by Jack Headley from American Aircraft Modeler 1975 - pic 005.jpg

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