Omega oz872


Omega - plan thumbnail image

Omega - completed model photo

This plan was found online 28/04/2011 at:
Outerzone planID: oz872 | Filesize: 805KB | Format: • PDFbitmap | Credit*: aeromeddeler


About this Plan

Omega - free flight pylon model.

Quote: "OMEGA has been designed to strike a happy medium between the extremes of pylon layout and incorporates the best of post-war design trends. It has a particularly impressive flight performance, and is unusual in that it employs a single leg under-carriage. Twin endplates complete the 'tricycle' for take off and unlike many models employing a similar layout it manages to ROG with complete success.

Omega takes-off dead straight and true from its single leg, picking up speed rapidly and travelling straight forward. From this attitude it goes into a steep, wide-circle climb of moderate angle which has proved safe under all conditions, Particular care had been paid in trimming to making the transition from power to glide as smooth as possible. There is no vicious stall, so common in power duration flying. Omega simply flies 'over the hump' when the power cuts into a smooth gliding turn in the same direction. This is partly due to good design proportions, but more especially to good trimming technique in obtaining the correct balance between rudder and torque reaction. The trim employed is a left circle on both power and glide. The glide circle is obtained by left rudder and this left circle is prevented from becoming dangerous under power by using offset or right thrust, patient trimming determining the correct amount required.

Initial glide adjustments must be for a slight nose-down attitude. This is good practice in trimming all power models. A 'floating' glide trim in the initial stages may well lead to stalling under the first power-on flights. Once the proper power trim has been established it is generally possible to improve the glide trim slightly. Designer Geoff Moss lays particular emphasis on using the right type and pitch of propeller, his comments applying equally well to all types of power duration models. Recommended propeller is a 10 x 4 for the Frog 500 power unit - a very much lower pitch than usually employed. Possibly this accounts in part, at least, for the excellent take-off characteristics with the mono-wheel undercarriage. Change of propeller may well mean a change in trim, which is a point many modellers might well bear in mind. All high performance power-duration models should be trimmed on the propeller on which the contest flights are to be made and spare propellers should be of identical size and manufacture. "

Update 12/02/2018: added article, thanks to RFJ.

Supplementary files



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oz872 datafile

by Geoff Moss
from Model Aircraft
May 1952 
60in span
Tags: IC F/F Pylon
all formers complete :)
got article :)


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