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Old Jun 04, 2008, 04:43 PM
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Cebola's Avatar
So Paulo - Brazil
Joined Apr 2004
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Build Log
AX my new glider, easy to build, easy to fly. Photos &Videos

When I design AX I was thinking on the beginner.
The concept -laser cut and very easy to assemble is the main line of this design.

Some Ax features.
A glider for cheap servos, engine, prop, and radio.
Easy to build sophisticated on appearance.
Light and, and easy to transport.
Easy to fix and repair
Good performance on thigh thermals, flyable in any small place.
Strong and resistant.
Good L/D

Some Ax data
Wingspan -74
Wing chord at root 9
Wing chord at tip 51/2
Aspect ratio 8.6
Wing Area 41 dm2
Airfoil HQ 3,0-10 HQ 3,0-9
Spars rounded spruce 3/16 diam.
Weight empty 10oz (on structure)

Some Ax photos on structure, after more photos covered, and in flight.

Hope you like it!

Cebola
Brazil
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Last edited by Cebola; Jul 15, 2008 at 07:59 PM.
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Old Jun 04, 2008, 08:14 PM
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Cebola's Avatar
So Paulo - Brazil
Joined Apr 2004
1,445 Posts
About the plans

PDF was made in real scale.

In case you need to copy the plan, any bureau, can make it.

In Brazil we use Xerox system.

Regards

Cebola
Brazil
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Old Jun 04, 2008, 09:42 PM
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Joined Aug 2005
6 Posts
great job, great designer.....
this airmodel is a dream!!

tomorow we go to choice the balsa!

This is a big ideia to use spars in 90 and 10% of airfoil.
I want to test this airfoil HQ 3,0-10 and HQ 3,0-9.
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Old Jun 06, 2008, 05:52 AM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
43,312 Posts
Another pretty model!
..a
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Old Jun 06, 2008, 10:53 AM
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Cebola's Avatar
So Paulo - Brazil
Joined Apr 2004
1,445 Posts
Quote:
Originally Posted by Andy W
Another pretty model!
..a
Hi Andy

Ax is covered, and made its first flight.
I really dont know about the winglet effect, but the glide ratio, is superb.
Maybe because of HQ airfoil, or maybe the winglet, or both.

Despite the poor engine performance, I use any cheap and Chinese engine has option, the model climb fast and vertical.

The plans for anyone that want to build this model, are free and ,just in case of any doubts call me.

Thanks for the nice words.

Cebola
Brazil
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Old Jun 06, 2008, 11:16 AM
Registered User
Terre Haute, Indiana, USA
Joined Aug 2004
959 Posts
Cebola,

Of course, you must show us some photos!

I love the fuse design. What is the flying weight of your new Ax?

FF
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Old Jun 06, 2008, 11:21 AM
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Cebola's Avatar
So Paulo - Brazil
Joined Apr 2004
1,445 Posts
Quote:
Originally Posted by Forest Flyer
Cebola,

Of course, you must show us some photos!

I love the fuse design. What is the flying weight of your new Ax?

FF

Hello Forest

Ax is a light model

Empty weight 11oz
Ready to fly, whit batteries 17oz or less depending the batteries.

Photos on next Saturday.

Regards
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Old Jun 06, 2008, 12:15 PM
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Rockledge, Florida
Joined Feb 2002
96 Posts
Another work of art, great model Cebola!
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Old Jun 06, 2008, 07:24 PM
I like EPP
matk's Avatar
Victoria BC Canada
Joined Sep 2005
186 Posts
It is sure a lovely one,nice to see some body still scratch build especally Glider, hat off to you.
Thank for sharing.
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Old Jun 07, 2008, 02:30 PM
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Cebola's Avatar
So Paulo - Brazil
Joined Apr 2004
1,445 Posts
AX is now ready to fly.
Very docile, and climbs like a missile.
One thing on this model is the finishing of airfoil myth.
I choose any HQ, thats looks like good for the kind of model, no complicated calculations, no any theory.
Just use the airfoil.
The result was very good and the model is a dream to fly.

Hope you like it.

Photos from Leonardo and my good friend Z OVO.

Cebola
Brazil
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Last edited by Cebola; Jun 08, 2008 at 08:48 PM.
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Old Jun 07, 2008, 05:09 PM
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So Paulo - Brazil
Joined Apr 2004
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Some videos


AX (0 min 30 sec)


Cebola
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Last edited by Cebola; Sep 21, 2008 at 02:02 PM.
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Old Jun 08, 2008, 06:23 AM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
43,312 Posts
OK, tell us about the winglets.

Are they just "looks about right" or have you done some kind of testing to see their effectiveness? I have been thinking about setting up a test stand that would measure drag and lift of a mounted airfoil section, similar to the thrust stands you see here for measuring static thrust, but more sensitive, using a small wind tunnel for measuring the effectiveness of different winglet designs..
..a
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Old Jun 08, 2008, 11:58 AM
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Cebola's Avatar
So Paulo - Brazil
Joined Apr 2004
1,445 Posts
Hi Andy

About the winglets, I decide to use because I never see any better solution for wingtips.
Normally this part of model, nobody cares, or is a simple balsa block carved in a smart shape, using the airfoil has reference.
Some facts: Despite low aspect ratio, Ax performs a very good glide ratio, better than my Hyperbolic Lady, behaves very reliable on tight turns in small thermals, and keeps a straight path, like a locomotive on Track.
I realize that is a good solution, and I can see a big difference in flight characteristics.
I know that this subject is very discussable, mainly because I did not use any theory, or aerodynamically resource to design the winglets.


Cebola
Brazil
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