New Products Flash Sale
Thread Tools
Old Jan 22, 2016, 10:51 AM
Dreamcatcher is offline
Find More Posts by Dreamcatcher
Warbirds Lover
Dreamcatcher's Avatar
South of France
Joined Jan 2008
2,073 Posts
Question
Bi-plane flying wing ?

Hi !

I was wondering if anybody ever tested to build a kind of bi-plane from a couple of EPP combat Flying wings ?

(with or without fuselage)

The purpose would be to increase the wing surface without increasing the size of the model and to allow it to carry more loads (for exemple some FPV gear with bigger batteries, and so on...)

Thanks
Dreamcatcher is offline Find More Posts by Dreamcatcher
Reply With Quote
Sign up now
to remove ads between posts
Old Jan 22, 2016, 07:31 PM
Pat Mattes is offline
Find More Posts by Pat Mattes
Registered User
Yoder, Indiana PROUDLY USA
Joined Dec 1996
120 Posts
Not with those particular wings, but sure. What do you want to know?
You'd want to have outer wing struts and something in the center (in the absence of a fuselage), the sole purpose of which would be to keep the two wings continually parallel to each other.
Additionally, you'd want to stagger them rather than stack. The reason being, with a stagger you will have a less sensitive CG point. Those are just a few thoughts. Do you have any particular questions?
Pat Mattes is offline Find More Posts by Pat Mattes
Reply With Quote
Old Jan 23, 2016, 03:33 AM
ConEx is offline
Find More Posts by ConEx
Registered User
ConEx's Avatar
Bern, Switzerland
Joined Jun 2010
93 Posts
Something like this?
ConEx is offline Find More Posts by ConEx
Reply With Quote
Old Jan 23, 2016, 06:37 AM
Dreamcatcher is offline
Find More Posts by Dreamcatcher
Warbirds Lover
Dreamcatcher's Avatar
South of France
Joined Jan 2008
2,073 Posts
Quote:
Originally Posted by Pat Mattes View Post
Not with those particular wings, but sure. What do you want to know?
You'd want to have outer wing struts and something in the center (in the absence of a fuselage), the sole purpose of which would be to keep the two wings continually parallel to each other.
Additionally, you'd want to stagger them rather than stack. The reason being, with a stagger you will have a less sensitive CG point. Those are just a few thoughts. Do you have any particular questions?
I was just wondering if somebody already tested to "link" a couple of this kind of EPP foam wings :
http://www.hobbyking.com/hobbyking/s...be_1000mm.html

In the purpose of a FPV use or to transform them in an "heavy lifter".

I would like to build an EPP FPV / aerial video model. I was thinking to design and build something out of depron but EPP foam is more "crash proof" than the Depron so... it could be better for a prototype.
The other problem is that EPP block are out priced here. That's why i was thinking to use some low cost commercial EPP wings.
Dreamcatcher is offline Find More Posts by Dreamcatcher
Last edited by Dreamcatcher; Jan 23, 2016 at 01:21 PM.
Reply With Quote
Old Jan 23, 2016, 06:38 AM
Dreamcatcher is offline
Find More Posts by Dreamcatcher
Warbirds Lover
Dreamcatcher's Avatar
South of France
Joined Jan 2008
2,073 Posts
Quote:
Originally Posted by ConEx View Post
Something like this?
Yes, i think that something like this could do the job !

Thanks
Dreamcatcher is offline Find More Posts by Dreamcatcher
Reply With Quote
Old Jan 23, 2016, 08:34 AM
Number_6 is offline
Find More Posts by Number_6
Ft Lauderdale
Number_6's Avatar
Joined Sep 2012
440 Posts
Quote:
Originally Posted by ConEx View Post
Something like this?
Really interesting, do you have video of them flying?

Number_6 is offline Find More Posts by Number_6
Reply With Quote
Old Jan 23, 2016, 10:51 AM
potshot is offline
Find More Posts by potshot
Vertical approach specialist
potshot's Avatar
Northeastern Illinois
Joined Mar 2009
1,170 Posts
Here's a thread on a "biplane" flying wing by a great designer and builder:

http://www.rcgroups.com/forums/showthread.php?t=2004271
potshot is offline Find More Posts by potshot
Reply With Quote
Old Jan 23, 2016, 01:25 PM
nuteman is offline
Find More Posts by nuteman
Registered User
Joined Apr 2013
1,373 Posts
Quote:
Originally Posted by Pat Mattes View Post
Additionally, you'd want to stagger them rather than stack. The reason being, with a stagger you will have a less sensitive CG point.
Mine accomplishes the above.
See: http://www.rcgroups.com/forums/showthread.php?t=2489266
A lot of the reasons for the way I did it are seen in subsequent discussion on that thread.
Hope that helps
nuteman is offline Find More Posts by nuteman
Reply With Quote
Old Jan 23, 2016, 01:48 PM
Dreamcatcher is offline
Find More Posts by Dreamcatcher
Warbirds Lover
Dreamcatcher's Avatar
South of France
Joined Jan 2008
2,073 Posts
Thanks potshot,
I had found this video on YouTube last week but it's not exactly what i'm searching.

The model picture posted by ConEx seems to be more able to transport FPV / aerial video cam
Dreamcatcher is offline Find More Posts by Dreamcatcher
Reply With Quote
Old Jan 26, 2016, 05:28 PM
Pat Mattes is offline
Find More Posts by Pat Mattes
Registered User
Yoder, Indiana PROUDLY USA
Joined Dec 1996
120 Posts
But there's a reason why you don't see full scale planes with wings that close together (Conex post). You're not taking full advantage of the lift capability of both wings. With increased inter-wing spacing, you could get by with even smaller wings and have the same amount of lift. With wings that close together, there are aerodynamic interferences which cancel out a lot of the benefit. Yea, it provides a bit more lift, but not nearly maximized for the capability you COULD have.
Pat Mattes is offline Find More Posts by Pat Mattes
Reply With Quote
Old Jan 26, 2016, 05:39 PM
DKNguyen is offline
Find More Posts by DKNguyen
Registered User
Edmonton, Alberta, Canada
Joined Oct 2008
658 Posts
I think tandem wing might have better performance and be easier to work with too (you basically have a tail) which still would not be as efficient as a regular tail for the reasons Pat mentioned.
DKNguyen is offline Find More Posts by DKNguyen
Reply With Quote
Old Jan 27, 2016, 03:34 AM
Dreamcatcher is offline
Find More Posts by Dreamcatcher
Warbirds Lover
Dreamcatcher's Avatar
South of France
Joined Jan 2008
2,073 Posts
Quote:
Originally Posted by Pat Mattes View Post
But there's a reason why you don't see full scale planes with wings that close together (Conex post). You're not taking full advantage of the lift capability of both wings. With increased inter-wing spacing, you could get by with even smaller wings and have the same amount of lift. With wings that close together, there are aerodynamic interferences which cancel out a lot of the benefit. Yea, it provides a bit more lift, but not nearly maximized for the capability you COULD have.
I agree withe that. I think that the drag generated by one wing can even aerodynamicaly mask the second wing on some angle of attack.

a real Biplane or Sesquiplane solution could be better indeed.
Dreamcatcher is offline Find More Posts by Dreamcatcher
Reply With Quote
Old Jan 27, 2016, 03:38 AM
Dreamcatcher is offline
Find More Posts by Dreamcatcher
Warbirds Lover
Dreamcatcher's Avatar
South of France
Joined Jan 2008
2,073 Posts
Quote:
Originally Posted by DKNguyen View Post
I think tandem wing might have better performance and be easier to work with too (you basically have a tail) which still would not be as efficient as a regular tail for the reasons Pat mentioned.
Yep...
What i was thinking about using two wing was to decrease the wing loading of the model without increasing the wing span
Dreamcatcher is offline Find More Posts by Dreamcatcher
Reply With Quote
Old Jan 27, 2016, 07:56 AM
DT56 is offline
Find More Posts by DT56
Registered User
Joined Aug 2005
2,958 Posts
Quote:
Originally Posted by Dreamcatcher View Post
Yep...
What i was thinking about using two wing was to decrease the wing loading of the model without increasing the wing span
Simply increasing the chord of a monoplane to provide that extra area will be more efficient that just about any biplane configuration. It's also much less complicated.
DT56 is offline Find More Posts by DT56
Reply With Quote
Old Jan 27, 2016, 08:14 AM
Dreamcatcher is offline
Find More Posts by Dreamcatcher
Warbirds Lover
Dreamcatcher's Avatar
South of France
Joined Jan 2008
2,073 Posts
Increasing the wing chord is not the solution imho - it will drive to a poor roll rate, big drag, modification of the plane's horizontal stability and a couple of other annoying things.
Dreamcatcher is offline Find More Posts by Dreamcatcher
Reply With Quote


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
New Product EPP Bi-plane DW PITTS from Dancing Wings Hobby nac Foamies (Kits) 4 Nov 14, 2015 03:34 PM
New Product 33.5 EPP Bi-plane DW Pitts from Dancing Wings Hobby DW Hobby Beginner Training Area (Aircraft-Electric) 10 May 26, 2015 02:27 AM
Sold Reactor Bi Plane Upper Wing NIB dawhale Aircraft - Fuel - Airplanes (FS/W) 1 Apr 26, 2015 08:44 PM
Sold fms beech craft stagger wing bi plane 40" wing lpu in mission valley $25 warhawk crazy Aircraft - Electric - Airplanes (FS/W) 3 Jan 14, 2014 09:48 PM
Discussion Flying Wing bi-plane? Rusty-Gunn Flying Wings 10 Oct 01, 2006 07:29 PM