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Old Sep 14, 2011, 12:28 PM
retrocopter
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Ireland, Dublin, Dublin City
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2d or 3d wing ribs?

Hi iv began to sketch up a few rough ideas on draught sight cad!but my question is....

as a first build being a close replica of a cessna/cub/my v.own creation
would it be simpler to build my wings flat witout raised ribs?
or go with the raised ribs=3d basically or 2d?

my gut tells me to go flat as it wont be as complicated and less likely to make any glue'ing mistakes with the ribs!
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Old Sep 14, 2011, 12:31 PM
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What construction method will you use? With balsa and covering, there's kinda only one way to do it...
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Old Sep 14, 2011, 12:35 PM
retrocopter
Marty7n's Avatar
Ireland, Dublin, Dublin City
Joined Jul 2011
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hi jasmine
yes balsa and covering it with a good aerofilm not bought the film yet,have not started the build yet but ready to go!
what way is that???
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Old Sep 14, 2011, 01:03 PM
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Are you thinking of making an under-cambered wing? Is that what you mean? Like, the difference between an under-cambered and flat wing? It's very difficult to make the under-camber with covering, but it can be done. I like to keep my wings generally convex though, as it's easier to get the covering to stick and stay. I can post some photos of the process later tonight - it's super easy.
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Old Sep 14, 2011, 01:22 PM
retrocopter
Marty7n's Avatar
Ireland, Dublin, Dublin City
Joined Jul 2011
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Quote:
Originally Posted by jasmine2501 View Post
Are you thinking of making an under-cambered wing? Is that what you mean? Like, the difference between an under-cambered and flat wing? It's very difficult to make the under-camber with covering, but it can be done. I like to keep my wings generally convex though, as it's easier to get the covering to stick and stay. I can post some photos of the process later tonight - it's super easy.
that would be great jasmine!
just to see what different methods different people use!
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Old Sep 14, 2011, 01:55 PM
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Here is the web site of one of the club's best builders. She usually wins the builder contest - so often that we basically have two groups in the contest - the builder's group, and the Franny group (masters).

http://frannybrodigan.com/ - tons of interesting stuff there - dig for the build logs.
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Old Sep 14, 2011, 02:08 PM
retrocopter
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Thank you jasmine
see not all women cant use tools lol great to hear of girls getin there hands dirty for a passion they love!
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Old Sep 14, 2011, 03:22 PM
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Originally Posted by Marty7n View Post
Thank you jasmine
see not all women cant use tools lol great to hear of girls getin there hands dirty for a passion they love!
Those ladies restored a car... I'm not that hard core

At the Christmas party they told the story of that Porsche... it's a fascinating story.
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Old Sep 14, 2011, 04:15 PM
retrocopter
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Ireland, Dublin, Dublin City
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i didnt get time to read it i was out in the garage cutting out 12 wing ribs!cut 7 and got abit tired,im up for work at 6 in the morning so a rest is needed,i work doing building interiors! i need to buy a new fine saw,i took my dads out only to notice that it was broke and will not hold the blade so improvise using a pad saw! alota swet with it compared to a fine saw but i hope to get a lend of my uncles electric scroll saw 2m fingers crossed hes not using it!
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Old Sep 14, 2011, 06:04 PM
retrocopter
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Ireland, Dublin, Dublin City
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Does anybody have any cool pictures of balsa cessna 150 wings?
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Old Sep 14, 2011, 07:16 PM
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Stack up several layers of balsa and cut your ribs 5 or 6 at a time on a band saw.

Oh yeah, that reminds me... one of my favorite possessions is a copy of this book... you need it if you're going to build.
http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LH8406
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Old Sep 14, 2011, 08:45 PM
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OK here's some photos of the general approach. This is what you're planning to do? I'm still not clear on your definition of 2D/3D...
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Old Sep 15, 2011, 10:14 AM
retrocopter
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Ireland, Dublin, Dublin City
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http://www.rcgroups.com/forums/attac...mentid=4279785
yes that would be 3d to me and the flat wing would be 2d but i have began cutting wing ribs so i'l be goin 3d/its not really 3d i didnt know that its just called a normal wing lol,im basically building a 40" in lenght wing cessna,wing will be about 6.5" wide or 7"!i havnt decided what lenght and width to make the fuselage!
im thinking 30" long and about 5.5" wide
i want it to glide well and not drop everytime i ease off the throttle so going to have the fuse considerably smaller than the lenght of the wings
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Old Sep 15, 2011, 12:44 PM
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You could look up the dimensions of the real plane and try to match your fuse to scale.

I think we use the terms "built-up" for the thick wing and "flat" or "profile" for wings and fuses of the other style.
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Old Sep 15, 2011, 04:30 PM
retrocopter
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Ireland, Dublin, Dublin City
Joined Jul 2011
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cool!well i have a drwing of a piper cherokee and got them scaled up by 100% but i am only going to use the 1 rib template for the whole wing,i have cut out a few will post a few pictures!i have a good idea where i am going with this build!
its kind of learn as i build!
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