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Old Feb 04, 2010, 10:35 PM
Foamy Season is here! MX2#1
pitviper51's Avatar
Elizabethtown, Kentucky
Joined Nov 2005
3,406 Posts
i need to get off my and build mine.. its been a year haha..
mike
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Old Feb 20, 2010, 04:55 AM
Registered User
Joined Dec 2006
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Happy Chinese New Year, every one!
We start to new project today.

Harry
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Old Feb 20, 2010, 01:04 PM
flying is not a dream
lebenj's Avatar
Spain, CT, Cardedeu
Joined Jan 2008
987 Posts
let us know about your new project

one piece pod? or a better and lighter tail boom

stiffer stabilsador and rudder.

a one piece wing should be perfect for the stiff!!!!
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Old Feb 28, 2010, 12:19 AM
The Penultimate flyer
TSnake's Avatar
Australia, WA, Cooloongup
Joined Apr 2007
1,509 Posts
Yes, please keep us informed Harry, I'm now a fan of your work.
Actually, what I'd like to see is the option for a strong two piece wing, as I have a need to disassemble my planes and pack them up for airline travel.

I managed to modify my Binary II so I can do just that (although it's still a one piece wing), and when assembled, it flys like a bought one.
The extra weight doesn't seem to effect it at all in the air.

Here are some pics of the mods, not very neat, and I may do some further aestetic changes, but for the time being... they're perfectly functional.
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Old Feb 28, 2010, 04:42 AM
flying is not a dream
lebenj's Avatar
Spain, CT, Cardedeu
Joined Jan 2008
987 Posts
i'm sorry, but you must do another elevador fixation. look at mine for example. it's strong and sure a better way than a rubber!!!!
another picture

for the rudder, i don't need for the moment to make it removable, but it's possible i think.

for the 2 pieces wing..... it's more delicate. as the throw stress it a lot, but why not
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Old Feb 28, 2010, 05:16 AM
The Penultimate flyer
TSnake's Avatar
Australia, WA, Cooloongup
Joined Apr 2007
1,509 Posts
Umm, OK.

Thanks, but I think I'll keep my "elevador fixation".
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Old Feb 28, 2010, 08:28 AM
flying is not a dream
lebenj's Avatar
Spain, CT, Cardedeu
Joined Jan 2008
987 Posts
can you imagine the drag your rubber give????

where all the people are looking the perfect angle between elevador and wing to reduce drag (in theory much less drag if the elevador is perfectly flat than the mobile surface a litlle bit up or down) and you put a rubber!!!???

please don't make that to a binary..... it's a so funny and delicate glider!!!!
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Old Feb 28, 2010, 09:40 AM
The Penultimate flyer
TSnake's Avatar
Australia, WA, Cooloongup
Joined Apr 2007
1,509 Posts
But it flys great, so I really don't care too much for "theoretical perfection".

In fact it flys as well as it did when I had the tail surfaces secured to the boom in the "ideal" way. I don't understand your angst, it's my plane, and I'm happy with it.
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Old Feb 28, 2010, 09:59 AM
a.k.a. Matt Nelson
MattN's Avatar
North Tustin, CA
Joined Oct 2008
1,781 Posts
my bigger worry about your setup is that it is exerting a twisting force in the plane of the stab. i'd fear that after some time, the constant lateral force against the mounting pins will start to elongate the holes in the stab, resulting in a lose fit and a crooked mount. that balsa is mighty soft...

but i also gotta agree that i wouldn't be satisfied with the rubber bands - but to each his own!

-matt
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Old Mar 01, 2010, 03:26 AM
flying is not a dream
lebenj's Avatar
Spain, CT, Cardedeu
Joined Jan 2008
987 Posts
Quote:
Originally Posted by TSnake View Post
But it flys great, so I really don't care too much for "theoretical perfection".

In fact it flys as well as it did when I had the tail surfaces secured to the boom in the "ideal" way. I don't understand your angst, it's my plane, and I'm happy with it.
don't worry, your are true, it's your plane...

i also use to fly models with things looking very strange, imposible, dangerous, for a lot of people...

it was just a kind of humor... ok?
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Old Mar 18, 2010, 10:33 AM
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LittleG's Avatar
Raleigh, NC
Joined Jan 2007
1,532 Posts
pivlrs: do you mind posting a photo of the top-side of the horizontal stab? I like to do same with mine, make it removable for portability and such; and yes, I still haven't finished building mine yet. I've had this plane for over a year now and all I have done on it is I have glued the wing panels together then I stopped, work got in the away and managing too many build projects.




Quote:
Originally Posted by pivlrs View Post
Well, I just finished a re-fit of my B900. The el-cheapo Cirrus servos gave out on me, so I did a little work on it:
  • Stripped out all the guts of the glider
  • Removed the tailgroup
  • Scraped the boom. Looks cool
  • Installed a couple D47s. These are smaller than I had thought - I believe they might be the shortest servos you can get (much shorter than GWS Pico's). The servos now stand upright in the pod!
  • Left room in the nose for one of ASK's NiMh battery packs. No more wimpy flight times.
  • While it was naked, I decided to try my hand at making some new tailfeathers - I copied the planform of the original surfaces, cut them out of generic balsa, rounded the LE's, tapered the TE's, and did a simple layup w/ 0.5 oz FG in an aqua-vac bag. I added a 1.4 oz FG live hinge in the layup, and am using that for the hinges now. I also added some 1k CF tow for stiffness. Came out pretty good for a first try.
  • Made the H-Stab removable - held in place by a nylon screw and two CF pins to keep it square to the boom.
  • Went all pull-spring
  • Routed the strings through the boom and out a little hole near the tail. Reinforced the boom on either side of the exit hole with a couple wraps of Kevlar thread.

Compared to my first build, this is now much cleaner. Pictures of the pod layout and the tail are attached.

AUW is 5.05 oz (143 g) with preliminary CG placement. Looking back at the build log, this is actually lighter than my first build, and I've got a bigger battery and no lead in the nose!

I'll re-maiden next weekend

-matt
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Last edited by LittleG; Mar 18, 2010 at 12:25 PM.
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Old Mar 18, 2010, 11:02 AM
flying is not a dream
lebenj's Avatar
Spain, CT, Cardedeu
Joined Jan 2008
987 Posts
did you look my horizontal stab? and this other picture ?

it's really strong, easy to do. really light and few aditional drag!

i would also like to make new stabilization parts, as the original one does not have a very good shape.....
i think drag can be better for these parts.

less drag -> you throw higher and you fly longer!!!!
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Old Mar 18, 2010, 12:23 PM
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LittleG's Avatar
Raleigh, NC
Joined Jan 2007
1,532 Posts
Thanks for posting these examples.
Quote:
Originally Posted by lebenj View Post
did you look my horizontal stab? and this other picture ?

it's really strong, easy to do. really light and few aditional drag!

i would also like to make new stabilization parts, as the original one does not have a very good shape.....
i think drag can be better for these parts.

less drag -> you throw higher and you fly longer!!!!
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Old Mar 21, 2010, 08:20 PM
Physics hate's my ideas
GreenAce92's Avatar
USA, NY, Dunkirk
Joined May 2007
3,913 Posts
How thick is the main wing like at the root chord? Or perhaps I should say what percentage is the airfoil on this model? Or the chord height?
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Old Apr 05, 2010, 01:17 AM
Registered User
millikenrob's Avatar
Joined Jun 2008
383 Posts
Here some vid of the Binary v2 doing some light sloping... Lloydh is the videographer.

Binary 900 Mini DLG at Charman Rd (2 min 23 sec)
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