Author Topic: Wing rib dimensions  (Read 635 times)

Offline gwjames

Wing rib dimensions
« on: January 31, 2020, 02:08:30 PM »
I have the downloaded xl plans and am the process of building the rib jig. My downloaded plans printed out in their original form very small, about 1/4 page. I printed the ones for the the rib and made new copies of them at +210% and got what appears to be very close to the correct size. My measurements are 7 1/8 high at the front spar 7 7/8 at the thickest point and 46 3/4 overall length. I am curious as to what some of you have determined the measurements should be.

Offline jrbirdman47

Re: Wing rib dimensions
« Reply #1 on: January 31, 2020, 04:39:12 PM »
I just got the Iron Design full size plans with wing details. Having built the wings, the full size rib plan and the change in building the aileron well was well worth it. That said....those dimensions are quite close!

Offline EthanP

Re: Wing rib dimensions
« Reply #2 on: January 31, 2020, 05:59:23 PM »
What I determined when doing mine is the front of the rib should be 1/16" taller than your spar height so when the leading edge plywood(0.8mm x 2) is wrapped over the spar it is even with the rib.  The black and white bars on the nose rib drawing represent 1".  I had to scale mine down to 95 or 96% to get that right.  I printed all sheets to that scaling and spaced them to try and get to overall cord length specified which left some gaps between a few sheets that had to be interpolated.  Also check that your rear spar will fit where it is supposed to go and that the aileron dimensions look like they match up.  Then spend about a week remeasuring and second guessing yourself!  Oh, and the spar spacing needs to match the fuselage wing attach dimensions.

Offline kalazzerx

Re: Wing rib dimensions
« Reply #3 on: January 31, 2020, 07:39:58 PM »
Based on my CAD drawings I used to make mine with...

Offline jrbirdman47

Re: Wing rib dimensions
« Reply #4 on: February 02, 2020, 05:56:06 AM »
EthanP- it all kinda comes out in the end anyway because you have to bevel the top of the front spar before assembly anyway and when you do you can match the height to the dimension of the ribs you have made as desired. Then when you make the nose ribs you can tailor them to the spar height as well. I doubt if any two Legal Eagles are actually the same in any area but we're talking about extremely small differences between plans and actual dimensions. Just think a lot, cut a little and make parts in sequence of assembly and you'll be fine.

Offline EthanP

Re: Wing rib dimensions
« Reply #5 on: February 02, 2020, 08:08:12 AM »
Your exactly right, the more you think ahead and review the plans you'll find the numbers you want to shoot for and if its off a little adjustments can be made.

Offline Kamcoman77

Re: Wing rib dimensions
« Reply #6 on: February 02, 2020, 10:09:46 PM »
The spar spacing needs to match the correct wing rib drawing. The wing mounting brackets are installed on the fuselage to match the wing spar spacing. It is probably a good idea to install the front wing mount bracket to match the fuselage drawing and then add the rear bracket to fit the fittings on your rear spar.

Offline gwjames

Re: Wing rib dimensions
« Reply #7 on: February 04, 2020, 04:54:49 PM »
Thanks to all who responded to my question about the rib dimensions. I can see there are variations between builders, I am working on my rib jig, looking forward to pulling out my first rib. This forum is great, lots of builders willing to step up to help newbies like me, thanks it is much appreciated.

Offline scottiniowa

Re: Wing rib dimensions
« Reply #8 on: February 06, 2020, 11:40:07 AM »
I have the downloaded xl plans and am the process of building the rib jig. My downloaded plans printed out in their original form very small, about 1/4 page. I printed the ones for the the rib and made new copies of them at +210% and got what appears to be very close to the correct size. My measurements are 7 1/8 high at the front spar 7 7/8 at the thickest point and 46 3/4 overall length. I am curious as to what some of you have determined the measurements should be.
For a 200 mph wing, we would worry about some dimension differences, for this wing, probably all are within tolerances that might not even be able to be measured.
Much of this would also depend on exactly where your starting and stopping with your measurements. These alone could be a difference of .250"
That being said,
I have 46.227" from aft of the front spar to the aft edge of the wing rib
from nose tip to above aft edge  54.213"
max height if bottom of wing is dead level, 7.716" 
of course rounding the above to one decimal is No problem.  Results may vary, a few have mentioned that building so that the nose rib, spar and rear (center section) all flow nicely is the real key. I agree.
Best of success
best email address:  irondesignairparts@gmail.com

Offline Greasybob

Re: Wing rib dimensions
« Reply #9 on: February 15, 2020, 03:53:31 PM »
Yes, I did the same thing and downloaded the plans for the Legal Eagle, but couldn't find the rib dimensions. I emailed Leonard and he said I need to send ten dollars more for the full size rib drawings. I'll probably do that, but Dang!.

Offline kalazzerx

Re: Wing rib dimensions
« Reply #10 on: February 16, 2020, 07:04:44 PM »
Get the supplements from iron design - then you get a lot more drawings along with the rib drawing - IMO anyway :)

Offline Richfroh

Re: Wing rib dimensions
« Reply #11 on: February 21, 2020, 12:41:21 AM »
I think you should get the rib drawings from Leonard. If you want supplemental drawings from Iron Designs or anywhere else they should be "supplemental" to what Leonard offers, and that is fine. Please do not try to bypass the original designer of any plane you build. They put in the time to design the airplane and have earned the support of purchasing the plans and drawings from them.
Rich Frohmiller

Offline scottiniowa

Re: Wing rib dimensions
« Reply #12 on: February 21, 2020, 06:13:42 AM »
I think you should get the rib drawings from Leonard. If you want supplemental drawings from Iron Designs or anywhere else they should be "supplemental" to what Leonard offers, and that is fine. Please do not try to bypass the original designer of any plane you build. They put in the time to design the airplane and have earned the support of purchasing the plans and drawings from them.
Yes, the supplemental plans were ALWAYS intended to help with the build, save time and know exactly how things are going to look  when done. To this "result" I think they have done well.  You would not be able to build the entire plane from the supplemental plans. 

To my knowledge, every set has gone to someone that has already bought a complete set of plans from the Legal Eagle crew. And that is the way it should be for best results.

Best of success.

Scott
best email address:  irondesignairparts@gmail.com

Offline Richfroh

Re: Wing rib dimensions
« Reply #13 on: February 21, 2020, 07:43:59 PM »
Thanks Scott, I know that was always your intention. I just wanted to remind others to always support the original designer first, then get supplemental information from other sources. While I have not used your drawings myself, I do look at what you post and think they are a great resource for many building these planes. Keep doing what you do.
Rich Frohmiller

Offline kalazzerx

Re: Wing rib dimensions
« Reply #14 on: February 23, 2020, 08:19:06 AM »
I think you should get the rib drawings from Leonard. If you want supplemental drawings from Iron Designs or anywhere else they should be "supplemental" to what Leonard offers, and that is fine. Please do not try to bypass the original designer of any plane you build. They put in the time to design the airplane and have earned the support of purchasing the plans and drawings from them.
Yes, I never intended for builder NOT to have original plans!  Just as an 'addon' to full plans the Supplementals are nice.

 


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