DH 103 Hornet (oz2876)
About this Plan
DeHavilland Hornet. Sport scale RC electric twin. Geared cobalt motors shown. Wingspan 58 in, wing area 600 sq in.
Quote: "Electric-powered British fighter. DeHavilland Hornet, by Roy Day.
This is a good-looking sport-scale model of the twin-engine Hornet fighter; variation in power and flight duration available with unique battery installation. Good takeoff, flight and landing characteristics.
THE OPERATIONAL success of the Mosquito Bomber was the basis for the development of the deHavilland 103 Hornet. The Hornet was conceived as a long-range, high-speed fighter that would be capable of combating the Japanese in the South Pacific during World War II. To satisfy the requirements for long range and high speed, the Hornet combined the ultimate in streamlining with twin 2,000hp Merlin engines. While the Hornet reminds one of the Mosquito and did benefit from that successful airplane, it was, in fact, a completely new design.
The first prototype flew in July 1944, only 13 months after detail design had begun. The prototype's climb and speed were exceptional. It reached 485mph - a record for prop-driven airplanes. Production and delivery of Hornets to the RAF did not begin until February 1945, so the war in the Pacific ended before Hornets could participate. They did, however, see considerable action as ground-attack fighters against the Malayan terrorists in 1951 to '54.
The Hornet was the last piston-engine airplane of the deHavilland line. Considered by many to be the ultimate in fighter design, it is unfortunate that not a single one has been preserved.
Why a twin? As a number of designers and builders have said, the electric-powered model is ideally suited to twins because there's no danger of one engine out. The arrangement of the two motors in series ensures that both are always powered.
Once it has been decided to model a twin, there are countless possibilities, from civil transports to bombers to long-range fighters. Few are modeled with gas engines because of the dreaded engine-out syndrome. For those who are interested in building electric twins, I strongly recommend Keith Shaw's article in the December '91 issue of Model Airplane News. Keith is a superb scale modeler and has been designing and building electrics - many of them twins - for years.
I selected the Hornet because it's aerodynamically clean and has very pleasing lines. It's well-proportioned for scaling as a model. The long engine nacelles and the sharply tapered wings give it a distinctive appearance in flight. The tapered wings are however a little more trouble to build, and washout is essential to avoid tip-stalling. The sleek con-figuration with adequate power provides a stand-off-scale model that performs well.
Easy battery-pack installation/ removal (through the nose).
Positive battery-pack restraint designed into the fuselage structure.
Balsa/ply sandwich construction for high strength-to-weight ratio.
Molded papier-mache for light nacelle fairings.
Power system. The Hornet uses two of the popular size of electric motors the AstroFlight geared 05 cobalts. Following discussions with Bill Young, Scale Electric editor of R/C Scale Modeler, it was decided to use iron stator rings on the motors, The stator rings increase efficiency by com-pletely containing the magnetic field. The rings are very thin and weigh less than 0.5 ounce each. They are inexpensive and can be bought from Hobby Lobby.
On a test stand, using nine cells, I tested a single geared 05 with and without the iron rings. I measured current draw and rpm. With the stator rings, the motor showed about a 15 percent reduction in current draw with hardly a measurable drop in rpm. This current reduction translates into longer flight times.
Construction. Attention to weight is crucial in electric-airplane construction. Use 6- to 10-pound/square-foot balsa wherever possible, except where something else is specified. Except for the ply doublers over balsa, use plywood/ hardwood only in high-load areas such as the landing gear and the wing mounts. Minimize the use of epoxy; thick and thin CA should do the job with few exceptions. Covering can be any light film..."
Direct submission to Outerzone.
Supplementary file notes
Article pages, text and pics, thanks to DHman.
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
De_Havilland_Hornet | help
see Wikipedia | search Outerzone
ScaleType: This (oz2876) 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/De_Havilland_Hornet
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, 2011-2021.
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.