Brazilian University Boomerang Racer Aircraft

hesham

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Hi,


here is a Brazilian University Boomerang single seat racer aircraft project.


http://www.boomerangracer.com/category/boomerang-images/
 

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ouroboros

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It may not be obvious from the above 3D model pictures, but the above is a box wing layout of sorts, with a swept forward top wing and a swept back bottom wing. Have there been many examples of biplane configurations where the wing sweep angles don't match enough to begin calling it a box wing layout?
 

hesham

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Hi Ouroboros,


we can consider it just a biplane design,not box-wing of course.
 

riggerrob

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Some nice ideas .... but there is still plenty of room for improvement on interference drag. For example, the version with the inverted gull wing could smooth airflow around the wheel pants with longer wheel pants (ala. Livings Love Formula One racer.

A taller canopy would help reduce interference drag where the top wing meets the fuselage. If those big components intersected at 90 degrees, air would flow much smoother.
 

Stargazer2006

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hesham said:
we can consider it just a biplane design,not box-wing of course.

I agree with hesham here: this is not a box-wing plane, it's simply a biplane! In my opinion the wings do not join, and the inter-wing struts are far too slim to correspond to what's been known as box-wing types before.
 

cluttonfred

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You're all right, it's not quite a box wing but it is a unusual negative stagger biplane racer with strong sweep to the lower, forward wing. As a racer that would improve visibility in turns.
 

riggerrob

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Those slender interplane struts only satisfy a Reno Air Race rule.
They have negligible structural function and almost zero aerodynamic function.
 

Stargazer2006

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riggerrob said:
Those slender interplane struts only satisfy a Reno Air Race rule.
They have negligible structural function and almost zero aerodynamic function.

Totally agree!

They actually remind me of what Burt Rutan had done on the early version of his Model 68 Laser, the famous "Amsoil Racer".
 

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Wahubna

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Skyblazer said:
riggerrob said:
Those slender interplane struts only satisfy a Reno Air Race rule.
They have negligible structural function and almost zero aerodynamic function.

Totally agree!

They actually remind me of what Burt Rutan had done on the early version of his Model 68 Laser, the famous "Amsoil Racer".

That is exactly what they are for.

Boomerang is totally NOT a box wing. Forward swept top wing to put the root behind the canopy and a forward swept wing to put the bottom root forward of the pilot's butt which will be on the fuselage floor. Each is cantilever like Phantom and the Amsoil racer.

Note the wireframe front view is NOT Boomerang but Tom Aberle's Phantom (which set a new speed record at Reno this year for the class).

Boomerang is the brainchild of Karl Grove (previously using a Pitts named Drag Racer) working with Paulo Iscold (Anequim designer). Karl Grove is all kinds of cool! Currently his Pitts biplane racer is still "for sale" and he is focusing his build efforts on his Lancair Super Legacy for sport class racing.

Tailwinds,
a homebuilt airplane nut
 

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