Author Topic: I-Beam wings - Rib cutting (Read 1448 times)

Paul Smith · « **on:** July 10, 2006, 06:11:22 PM »

'Back in the day" the masters around here recommended just cutting all the ribs the same for starters.

Then they glued them on, starting from the centre, cutting a little off the back end as required.

While this procedure certainly produces a wing, I've always been concerned that the airfoil is distorted as it gets narrower toward the tip. In particular, the "flat" part of the airfoil is trimmed, leaving more and more of the highly cambered LE area.

What is the current doctrine?

wmiii · « **Reply #1 on:** July 10, 2006, 06:23:01 PM »

Perhaps that is the way it was planned. In Bob Hunt's video, with Bill
Werage doing the demo , thats the way he did it and still does it this way as far as I am aware.

Walter

john e. holliday · « **Reply #2 on:** July 10, 2006, 08:25:58 PM »

That is the only way it is done on any I-Beam wing. It works, so don't ask why. DOC Holliday

Randy Powell · « **Reply #3 on:** July 11, 2006, 09:56:22 AM »

I've done them this way (trimming only from the back). I've also marked the ribs where they intersect the spar (straight spar, tip to tip). and trimmed the ribs front and back, keep the center of the rib (airfoil) in the same spot at the spar all the way down. Either way works. With the first, you get the high point moving forward which can be a good thing. With the other, you get a straight taper that maintains the high point straight down the wing with just a touch of rearward movement. Sort of depends on what you're trying to accomplish from a design perspective.

Bill Little · « **Reply #4 on:** July 13, 2006, 10:23:00 AM »

Well it's the old Blind Squirrel grubbing up an acorn again. I have never had a problem with an I-Beam built in the traditional manner. My USA-1, '59 Ares, and Argus were some of the best flying planes I've had.

Bill <><

Author Topic: I-Beam wings - Rib cutting (Read 1448 times)

Paul Smith

I-Beam wings - Rib cutting

wmiii

Re: I-Beam wings - Rib cutting

john e. holliday

Re: I-Beam wings - Rib cutting

Randy Powell

Re: I-Beam wings - Rib cutting

Bill Little

Re: I-Beam wings - Rib cutting