Dieselpunks

Dieselpunk + Steampunk Culture

For the 50th issue, I had to send something very special via the Saturday Air Mail. And here it is:

Boeing Model 306 2

Imagine the skies full of tailless aircraft of all sizes. It's easy. Just remember all those 30s and 40s ads promising bright future on (literally) flying wings. To think of Boeings in this entourage is not so easy: collective memory prompts us to recall names like Northrop and Lippisch. Probably Burnelli. But Boeing? Believe me, the name is not out of place here.

Boeing Model 306 4While Boeing was working on the XB-15 in the 1930s that would ultimately lead to the smaller but more advanced B-17 Flying Fortress and B-29 Superfortress, the company was engaged in a secret parallel project to develop a flying wing bomber that used some of the XB-15 features but was expected to exceed the performance of the XB-15 in every aspect. Boeing has never been previously associated with flying wing research with its current efforts in BWB (blended-wing-body) designs and the X-48 research program the legacy of the merger with McDonnell Douglas.

Boeing Model 306 1Conventional wisdom of the day at Boeing regarded flying wings as less stable and having less than ideal handling issues than aircraft of conventional layout. Despite the prevailing attitudes of the company at the time, it did engage in flying wing research in 1935, developing a whole series of flying wing aircraft from the XB-15-derived flying bomber to fighters, airliners and even flying boats.

Boeing Model 306C 2Boeing Model 306C 1Boeing Model 306B 2The Boeing Model 306 was the biggest and most impressive of the designs, aiming to capitalize on the aerodynamic advantages of the flying wing to improve upon the design work started with the XB-15. Having a crew of 10, the Model 306 had a swept wing of 140 feet in wingspan with a fuselage 60 feet in length.

Boeing Model 306 5Four forward-mounted engines on the wings used 850-horsepower Allison V-1710 12-cylinder liquid cooled engines. Having a fully-retractable taildragger landing gear layout, the Model 306 bomber would have had a range of 5,000 miles with a 2,500 bomb load. Defensive armament consisted of a mix of 50-caliber and 30-caliber guns.

Boeing Model 306 Airliner 1
One of the more interesting features of the Model 306 had its elevons supported behind the wing trailing edge on long struts. Wind tunnel testing showed this arrangement more efficient as the pivoting and use of the elevons wouldn't interfere with the aerodynamic performance of the swept-wing.

Boeing Model 306 Flying BoatsIt was only in 2005 that this series of designs came to light. It appears that all of the flying wing designs were collectively designated in-house as Model 306. Considering the state of the art in aircraft design in the 1930s, the Boeing Model 306 flying wing bomber stands out as quite futuristic!
Boeing Model 306 3

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Comment by Cap'n Tony on June 18, 2012 at 9:00am

The Flying Wing Clipper looks like something out of Star Trek!  Excellent find, lord_k!

Comment by lord_k on June 16, 2012 at 4:58pm

Thank you Kev.

Comment by Kev Cudby on June 16, 2012 at 4:56pm

Thanks for posting these. They look so cool.

Boeing and NASA have recently looked into tailless aircraft, which they call blended wing-body. Here's public domain image from NASA, of a concept called the N3X:

Here's NASA's X48B webpage http://www.nasa.gov/topics/aeronautics/features/bwb_main.html

I reckon BWB aircraft would look better with propellers. They can use diesel aviation engines, such as the Thielert TAE 125 (Used Diamond Aircraft Industries' D40D).

I like those tailless flying boat images. Go anywhere any time :)

Comment by Lejon Astray on June 16, 2012 at 12:59pm

The B-15 never looked so cool!

Comment by lord_k on June 16, 2012 at 11:15am

Thank you Dan.

Comment by Dan G. on June 16, 2012 at 11:03am

FANTASTIC! A GREAT article and Great images of a "lost" design.

If these birds could have overcome their handling challenges we could sure be looking at a whole other way of air travel these days. Makes ya wonder how much sooner we would have seen birds like the B-2 or the F-117. Also makes one wonder what effect, if any, these designs would have had on the war?

Aside Note = As a kid, my first scratch build (just to be contrary to all of my friends! LOL) was a String Flyer version of a flying wing with the extended strut mounted elevons. Now I finally have a good idea of where that design might have originated. THANKS!  BTW= She was a sweet flyer that spent many long hours in the air! Surely the starting point of my love affair with these unusual birds!

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