Eagler's Nest
Airframes => Single Seaters => XL => Topic started by: 914pete on August 17, 2017, 06:52:49 AM
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I'm working on the horizontal stabilizer and the elevator. I'm having trouble understanding how the horizontal stab is attached to the fuselage. I guess I'm not visualizing the bushing arrangements on page 19. Does anyone have a picture of the horizontal stab connected to the fuse?
Also, is the vertical fin attached to the fuse with only two #10 AN bolts, one in the front and one through the tail post? I've seen pics of the front attach point being a tube welded to the fuse. The plans show two tabs welded to the fuse. I'm inclined to use a tube rather then tabs. Is there an advantage to using two tabs?
I really appreciate the input, thanks! Pete
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Pete, I'll try my best
Anyone with a photo please send it. Pictures can really clarify things. Like the prop balancing thread. I thought they were balancing props.
The picture revealed they were balancing prop engine combination.
My drawings are older and I have no tabs shown on the drawing, just bushings, and tubes. Here goes.
horizontal- page 19 shows two 4" long tubes with 3/8 bushings welded perpendicular in the center on the side of the tubes. One is 7/8, one is 3/4.
The long tubes act as sockets for the horizontal tubing coming in from both sides. the bushing is the fuselage attachment.
pg 25 will show two 3/8 bushings welded vertically through the top longeron tube. a bolt goes through each and through the bushing on the 4" tubes.
You may consider staying a little long on the bushings. Can quickly be filed, ground or cut down changing the incidence and relying on something other than a stack of washers'.
Vertical- page 25 has a 7/8 top of the tail post to act as one socket and a 5/8 tube welded to the top of the longeron for the front socket.
hope that helps
Tom XL-7
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Hit the play button.
Set gear icon in bottom right to 1080p.
Hit the quad brackets icon to go full screen.
Skip ahead to 1 minute.
Use pause button copiously....
https://www.youtube.com/watch?v=wdXSKtKcUUM
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I saw the tabs at the front fin. Like it more than the tube. Likely stronger.
if formed to tube contour would provide a lot of weld area spread over increased length and no water trap. thanks, Dan and Les
tom XL-7
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Thanks Fellas! Makes sense now. Funny, I was thinking about the water trap in the tail post because I welded a plate at the bottom for my tail wheel mount but didn't consider it for the front tube. I think the tabs will be stronger as well. I will stick to the plans and use tabs. Great vid Dan, thanks! Very helpful.
The plans mention 3/16" holes for the horizontal stab attach points and brace wire tubes which equates to a #10 dia. screw. I'm not seeing a reference to the vertical fin attach points and am assuming its #10 screws again. The brace wire tubes are 3/16" or a #10 as well. Have you all found this dia. screw sufficient? Pete
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Thanks Fellas! Makes sense now. Funny, I was thinking about the water trap in the tail post because I welded a plate at the bottom for my tail wheel mount but didn't consider it for the front tube. I think the tabs will be stronger as well. I will stick to the plans and use tabs. Great vid Dan, thanks! Very helpful.
The plans mention 3/16" holes for the horizontal stab attach points and brace wire tubes which equates to a #10 dia. screw. I'm not seeing a reference to the vertical fin attach points and am assuming its #10 screws again. The brace wire tubes are 3/16" or a #10 as well. Have you all found this dia. screw sufficient? Pete
I tend to over build everything. This is the first time building something where I have to be concerned about weight.
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Great vid Dan, thanks! Very helpful.
Pete
Pete,
It is thanks to Les Homan for sharing his many videos with us.
Here is a link to his YT channel...
https://www.youtube.com/user/homanles/videos (https://www.youtube.com/user/homanles/videos)