Y Bar

 

Y Bar - plan thumbnail image

Y Bar - completed model photo

Y Bar  
by Tony Brooks
from Aeromodeller (ref:590)
June 1955 
40in span
Tags: IC F/F Pylon
all formers complete :)
got article :)


Submitted to Outerzone: 27/02/2018
Outerzone planID: oz9878 | Filesize: 305KB | Format: • PDFbitmap | Credit*: stormin

   

About this Plan

Y-Bar by AJ Brooks (Tony). A 40 inch wingspan contest model for 1.5cc engines. Elfin 1.49 shown.

Quote: "FOLLOWING A SERIES of contest power designs emanating from the keen group of modellers among the student apprentices at R.A.E. Farnborough, the Y-Bar is a successor to the T-Bar, Buzz-Bar, and the eminent American expert Ray Mathew's design the Fu-Bar (oz953). Tony Brooks has given this particular model a very suitable name for the symbol Y as used in mathematics, usually designates height - one of the characteristics to be expected of this model.

First one built was powered by an Arden .099, glow-plugged, and proved to be very satisfactory so a new one was made for an Elfin 149. This also proved 'hot' by placing 8th in the Keil trophy, and 1st at the All Britain Rally 1954. The only features which may be unusual for a contest model are the flat bottomed wing section and the rear mounted fin, though these are by no means new features, each contributing to the stability of the design.

Construction of the wing and tail is simple enough for even a relative beginner to the hobby to tackle with confidence, and only the fuselage requires a few notes regarding sequence of assembly. This is as follows:

Cut out all parts. Cement ply gussets to bearers. Build up basic frame. Cut slots for pylon and fin. Trim rear fuselage in plan view. Cement in pylon and fin. Cover sides with 1/16 sheet. Add wing platform, tail platform, etc.

Trimming. All flying surfaces must be flat, except for approximately a 1/8 in to 5/32 in wash in on right-hand inner wing panel. Tilt the tail until righthand tip is about 1 in above the level position. (It is easier to cement the tail platform at this angle initially.) Thrust line should be straight with no side, up or down thrust. Test the glide for a medium diameter righthand circle..."

Y-Bar from Aeromodeller June 1955.

Update 13/03/2018: added article, thanks to RFJ.

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