Delta Lady oz10383

 

Delta Lady - plan thumbnail image

Delta Lady - completed model photo

Submitted to Outerzone: 18/08/2018
Outerzone planID: oz10383 | Filesize: 747KB | Format: • PDFbitmap | Credit*: Circlip, RFJ

   

About this Plan

Delta Lady. Radio control aerobatic slope soarer.

Quote: "Design parameters of a not-too-orthodox but highly aerobatic soarer has been met with the Delta configuration for our unusual but neat sailplane that can be fun or businesslike for contesting! The Delta Lady, by Mike Trew.

After taking the natural progression from a trainer type soarer up to a highly aerobatic soarer I looked around for something new to build and fly. I desired a model that was different and original but not too unorthodox such as a canard or 'tail first' design. I struck on the delta type planform as it had the obvious advantage of low wing loading, sleek drag-free lines, and plenty of room to stow away the radio equipment.

I tried to find a suitable design but there was very little available and those that were had only been developments from free flight models. Therefore, I decided to design my own. I gave considerable thought to designing a layout that was as efficient as possible yet not too complicated to make the construction lengthy and tiresome. Right from the outset I discarded the use of elevons as they are a compromise giving too much pitch effect but not enough roll, and if mechanical linkage is used there is invariably too much linkage slop.

The trailing edge was raked forward to give a straight hinge line, giving a large area of elevator which only has to move through a small amount to give the required degree of effect. This had the effect of considerably reducing surface drag. The ailerons are placed outboard where their effect is greatest. The wing section is fully symmetrical SI .03006 and the reflex is incorporated by deflecting the elevator upwards. It may be a temptation to raise the aileron also to obtain a constant line through the trailing edge but this is inadvisable as the inverted flight characteristics will suffer.

A low wing design was chosen to make it look more scalish and the fuselage nacelle is bolted on to the top of the wing. The large fin was used to obtain good directional stability and a generous rudder surface is incorporated to give a good stall turn effect..."

Delta Lady, MAN, February 1979.

Direct submission to Outerzone.

Supplementary files

Article pages, thanks to RFJ.

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oz10383 datafile

Delta Lady  
by Mike Trew
from Model Airplane News
February 1979 
54in span
Tags: Glider R/C
all formers complete :)
got article :)

 

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User comments

Hi, hope that these pictures are of use [more pics 005, 006].
DavidW - 30/10/2018
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Notes

* Credit field

The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.

Scaling

This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.

 

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