Boulton Paul Defiant oz10307

 

Boulton Paul Defiant - plan thumbnail image

Boulton Paul Defiant - completed model photo

This plan was found online 23/07/2018 at: http://www.hippocketaeronautics.com/hpa_plans/details.php?image_id=10552
Outerzone planID: oz10307 | Filesize: 834KB | Format: • PDFbitmap | Credit*: otech66

   

About this Plan

Boulton-Paul Defiant. Control line scale model. Wingspan 39-1/4 in, for .35 power. Scale is 1/12.

Quote: "Control Line Scale 1 in to the foot of well-known WW II fighter/interceptor that performed valiantly in the early part of the war. Good looking machine with rear gun turret should hold its own at any contest. Boulton Paul Defiant by Charles Felton.

In the 1930's, the increasing speed of new military aircraft made the problem of manual gun traverse progressively more difficult. Following successful developments by the French aircraft industry, the practice of concentrating defensive armament in turrest commenced. In 1935 the British Air Ministry issued Specification F.9/35 calling for a two-seat fighter, main armament of which was to be concentrated in a turret. It was felt that a turret fighter offered increasing operational flexibility, capable of engaging enemy bombers from many quarters, particularly from below, and a 360° upper hemisphere field of fire was therefore specified. It was also intended that the fighter should have a performance approaching that of any contemporary single-seat fighter despite the weight and drag penalties of the turret.

The Boulton & Paul Company, having successfully wedded a power-operated turret to a Sidestrand bomber in 1931, submitted plans for a fighter, designated the 'Defiant,' superficially similar in size and appearance to the Hawker Hurricane. On a wing span of only 39 feet 4 inches, with an area of 250 square feet, it carried 1500 pounds more weight than the Hurricane, whose comparative measurements were 40 feet and 257 square feet. A clean design was achieved with a simple weight-saving structure.

The Defiants did have their moment of glory. They distinguished themselves during the fighting over the Dunkirk beaches during the evacuation of the British Expeditionary Force. Defiants and Hurricanes were mixed in formation and the resultant confusion of the German pilots led to a heavy loss of enemy fighter planes to the guns of the Defiants.

This model is built to a 1 in scale which gives it a wingspan of just over 39 in and a length of 35 in. The engine is an O.S. Max 35 which provides ample power for good per-formance. Now for the construction details.

Construction. Wing. Cut out all wing ribs. Cut out holes in ribs for the bellcrank leadout wires in left ribs only. The inner wing section is made first. Pin ribs W-1 through W-4 upright over plans, flat edge down. Glue two 1/8 x 1/4 spars across the top of the ribs from W4 left side to W4 right side. When dry, remove from board, turn the assembly upside down over the plans and pin the installed spars flat to the plans.

Glue 1/8 x 1/4 spars across the bottom edge of ribs and splice at centerline as shown in the wing front view. Remove from plans and set aside to dry. Cut out two outer wing spars from 1/8 plywood and pin upright over plans..."

Update 03/08/2018: added article, thanks to RFJ.

Supplementary files

Article.

Corrections?

Did we get something wrong with this plan? That happens sometimes. Help us make a correction

 

oz10307 datafile

Boulton Paul Defiant  
by Chuck Felton
from Model Airplane News
August 1973 
39in span
Tags: Scale IC C/L LowWing Military Fighter
all formers complete :)
got article :)

 

003.jpg
003.jpg
004.jpg
004.jpg
005.jpg
005.jpg
006.jpg
006.jpg

Do you have a photo you'd like to submit for this page? Then email admin@outerzone.co.uk

User comments

No comments yet for this plan. Got something to say about this one? Click here to Add a comment

 

 

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.

 

Terms of Use

© Outerzone, 2011-2018.

All content is free to download for personal use.

For non-personal use and/or publication: plans, photos, excerpts, links etc may be used, provided that full and clear credit is given to Outerzone with appropriate and specific direction to the original content i.e. a direct hyperlink back to the Outerzone source page.

Unauthorized use and/or duplication of this material without express and written permission from this site's owner is strictly prohibited. If we discover that content is being stolen, we will consider filing a formal DMCA notice.