Boulton Paul Defiant (oz10307)
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 file notes
Did we get something wrong with these details about this plan (especially the datafile)?
That happens sometimes. You can help us fix it.
Add a correction
Boulton Paul Defiant
by Chuck Felton
from Model Airplane News
Scale IC C/L LowWing Military Fighter
all formers complete :)
got article :)
Found online 23/07/2018 at:
Format: • PDFbitmap
Boulton_Paul_Defiant | help
see Wikipedia | search Outerzone
ScaleType: This (oz10307) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.
If we got this right, you now have a couple of direct links (above) to 1. see the Wikipedia page, and 2. search Oz for more plans of this type. If we didn't, then see below.
ScaleType is formed from the last part of the Wikipedia page address, which here is https://en.wikipedia.org/wiki/Boulton_Paul_Defiant
Wikipedia page addresses may well change over time.
For more obscure types, there currently will be no Wiki page found. We tag these cases as ScaleType = NotFound. These will change over time.
Corrections? Use the correction form to tell us the new/better ScaleType link we should be using. Thanks.
Do you have a photo you'd like to submit for this page? Then email email@example.com
User commentsNo comments yet for this plan. Got something to say about this one?
Add a comment
* 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.
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.
© Outerzone, 2011-2019.
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.