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voyager_663rd -> RE: Wing Tip Modifications (2/24/2004 1:20:50 AM)
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quote:
ORIGINAL: CorsairJock
I start out with this drawing of the tips as viewed from the front. What should become evident is that the outline of the top of the outer wing panels are absolutely straight from the root (of the outer panel/ wing fold line), until it rounds downward at the very end (tip) to meet the underside. This is true not only at the spar, but all the way across. In other words, you should be able to lay a straight edge on the spar, or the trailing edge, or the rear spar area (where flaps and ailerons meet the wing), and see no gap until the very end of the tip. Of the 2 Top Flite versions, the red box is the worst, but both of them have the top drooping beginning several inches from the tips.
To correct the Gold Edition, wing ribs T-7 need to be modified (before assembly) by trimming about 1/8 all the way across the bottom, 1/32 from the upper spar notch, and 1/16 from the rear alignment tab. This should get you pretty close, you can check by assembling and using a straight edge to see if the tops of all ribs line up, all the way across. Some sanding (with a hobby/ straight sander) will be required to make T-7 be properly aligned with the other ribs. Making this correction will also add a slight washout effect, making tip stalls less likely. It is not necessary to bring the tips to a point as shown on the scale view. Doing so makes the mod more difficult, and will result in a tip that is more easily damaged. The option is yours. However, I do encourage you to at least make the top straight, and make yours closer to scale.
You should also add a piece of balsa about ¾ x ¾ x 1 1/2 long to the rear of the leading edge stock, into the corner, butting up against T-7 (if you have not yet sheeted the wing). Sand to match the airfoil, as you will be sheeting over this. This is needed because of the additional rounding of the leading edge profile which is needed for the next mod. Without it, the sheeting can be sanded too thin when the correct profile is done.
Couple of questions here regarding the left and right tip panels. I am getting confused about top and bottom and which way is up and which way is down. When I'm looking down on the plans, it says its the right wing tip panel.
1.If I build with the "tabs" on the bottom the FIRST time, I am building the RIGHT tip panel. Correct?
2)It says to cut a v-notch in the bottom spar (which when I'm building the right tip panel, is really on the BOTTOM (against the building board). RIGHT?
3)The open part of the V is pointing to the sky. RIGHT?
4)Skipping ahead to the left panel (which is built on the same view), the tabs are still on the bottom (against the building board) but now that tab-side is really the TOP of the wing. RIGHT and the V is now cut on the inside of the TOP spar, with the open V pointing down towards the building board (tabs are still against the building board). If the LEFT panel were completed at this stage, it could be flipped over and is identical (but mirror image) to the right tip panel. RIGHT?
5)In conclusion to these 4 questions, the right wing tip panel is built right side up and the left panel is built upside down (even though the tabs are always on the building board). RIGHT?
SECOND QUESTION (pics attached).
This concerns the addition of the 3/4 x 3/4 x 1 1/2" block. Pic one is a full view of this proposed setup. Pic 2 is a close up.
6)Is my location of this added block correct?
7) A close up of that area with the block opened up (for question purposes). Is the block supposed to be "centered" on the rib LE so that sanding takes place top and bottom of the block to match the airfoil?
With this block, I'm having a hard time visualizing just what it's supposed to do. Is it to provide additional support for the sheeting or is it supposed to replace some of the sheeting (that gets sanded through) due to the extra sanding thats needed to correct the shape of the wing tip?
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