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Author Topic: Continued Sturcture  (Read 1584 times)

Offline Randy Powell

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Continued Sturcture
« on: June 10, 2007, 08:52:39 PM »
OK, here's a couple of pictures of the top of the wing. It's ready to flip over and put on the half ribs, sheeting and capstrips. Doesn't look bad so far. It's going together pretty easy. I think I'm starting to get the hang of this. No tip weight box build yet. I have an idea for a new one so I'll build that when I flip the wing over. Also, haven't put the landing gear blocks in yet. Those go in the bottom, of course.

Be kind. I haven't really sanded anything yet other than leveling the ribs.
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Offline Mark Scarborough

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Re: Continued Sturcture
« Reply #1 on: June 10, 2007, 10:57:01 PM »
As per usual Randy I love it. Some day, I am GOING to build a wing that way. I just dig the whole concept. Did I remember you saying it gets cap strips too?
I am curious about your adj leadout setup. It appears that instead of a normal plate for the slider, you are maybe using two peices of ply edgewise and clamping across that? details my man, I feel a need to steal,, um I mean learn some more of your unique techniques.
keep it up.
weather, rainy and gusty today, no flying again.. sigh, oh well, it let me get lots of building done. Got my landing gear rigged and ready to make spats. Also got the trailing edge laminations done for the elevators.
For years the rat race had me going around in circles, Now I do it for fun!
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Offline Randy Powell

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Re: Continued Sturcture
« Reply #2 on: June 11, 2007, 08:56:22 AM »
Mark,

>>Did I remember you saying it gets cap strips too?<<

Look close. They are capstripped. The ribs are 3/32" with 3/16" x 1/16" capstrips. I tried 1/16" ribs, but the center stretch is too long and even with cap trips, they are too flexible.

The slider is two pieces of 1/8" lite play with an 1/8" spacer. the inside part is cut flat to let the slider move in a straight line. The outside has the screw. Not very elegant, but it works and is easy to adjust. It was the only setup I could come up with that would fit the tip design without have a really long path from the slider bar to the exit through the tip. I probably should have gone with the hole and slot method (like PW uses), but I didn't for whatever reason. This seems like it will work OK and the tip has plent of reinforcement to handle the flex.

Remind me at Puyallup and I'll bring some jig parts and we can talk about it.
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Offline Tom Niebuhr

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Re: Continued Sturcture
« Reply #3 on: June 12, 2007, 02:08:31 AM »
Randy,
As usual, your building techniques are superb. I am anxious to see details of the gear mount.
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Offline Mark Scarborough

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Re: Continued Sturcture
« Reply #4 on: June 12, 2007, 07:02:09 AM »
Randy, I guess yeah if I put my glasses on, it does have cap strips huh,, sigh,  HB~> and here I just thought they were thicker ribs when I first looked at it. Guess thats what I get for readin the board while I am at work

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Offline Randy Powell

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Re: Continued Sturcture
« Reply #5 on: June 12, 2007, 08:40:56 AM »
Tom,

Worked on the gear mount last night. As I found out with the Novi, the gear mounting method works fine but doesn't really hold up to a slap on the ground <sigh>. I'm modifying it slightly for this wing.

Interesting note: I pulled the wing out of the jig last night and flipped it over to do the bottom. It will need the gear mount, the rest of the half ribs (18 total) and the bottom sheeting and capstrips. I went ahead and put the thing on the scale just to see where I'm at. As it is in the top pictures, it weighs 5.1 oz. If I don't do anything stupid, this wing should come in under 8oz. That should work OK. But it really emphasizes the need to build another stab. The stab weighs a touch over an ouce without the horn. Sigh...

Mark,

 LL~
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Offline Tom Niebuhr

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Re: Continued Sturcture
« Reply #6 on: June 12, 2007, 11:50:45 PM »
Randy,
I have started work on the Sheeks "Sea Vixen" for VSC 2008. I will use a removable gear against the I-beam, so your mounting will be very interesting.

I will post Vixen pictures and details in a separate post when I get a little further along, but at this time, I am glad that Jack has been there for help over the phone. The plans have numerous blatant mistakes: The span should be 56", but the plan is 52.5", this changes the wing layout, and sweep of spars, etc.; the booms are not detailed, but Jack had originally submitted the details; the rudder grain is 90° off, and a rudder top view would be very useful; the spar detail height is 1/4" off at the root.. it goes on & on.  I am having to do layouts from view to view just to build it. It will be worth it though.

Unfortunately many of the old magazine plans were this way, with rush to publication dates, changes to fit the page, and draftsmen, who although, very good at their art,  were not familiar with the details of the design. Thankfully most of the current publications have paid more attention to the details.
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Offline Randy Powell

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Re: Continued Sturcture
« Reply #7 on: June 13, 2007, 11:11:50 AM »
Tom,

Bummer on the plans. Yikes. What a bunch of extra work.

I'll shoot some pictures of the setup when done. I have some other pictures I've done largely the same way. Maybe I can dig some of those up. I'm probably over-thinking myself on this new one. I thought of a trick hold down system that I think will look a bit cleaner. But it's turning into a contest of ingenuity. We'll see what I come up with tonight.
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Offline Tom Niebuhr

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Re: Continued Sturcture
« Reply #8 on: June 13, 2007, 10:30:40 PM »
Randy,

"But it's turning into a contest of ingenuity."

That is an under statement sometimes!

I worked out a combination bellcrank and removable gear mount that will replace the bottom spar cap in the gear/boom area. The top cap will have a smaller extension for the top of the bellcrank pivot.

Looks like I don't have enough room to use larger than a 3" bell crank, due to the interconnect between the booms and very limited room in the aft boom/rudders for the elevator horns. But, we used the 3" bellcranks for years, so it will work. I'll have to sleep on it.
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Offline Randy Powell

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Re: Continued Sturcture
« Reply #9 on: June 14, 2007, 12:30:36 PM »
Tom,

Looks like I've got it worked out. I'm deciding if it needs any additional bracing now, but I think it's OK. Should be able to finish it up in the next day or so and I'll shoot some pictures. I use Windy's idea of have the gear sit in the base then running the torque rod all the way to the top of the wing with a retention block there. give the gear a lot of strength, but has the drawback of putting a lot of torque on the spar on hard landings. If supported well enough, that's not a big deal...unless you bounce it off the ground hard like I did the Novi. Sigh... Build to withstand flight stresses or build to withstand close encounters with the pavement. I generally take the former and pay for it when the latter occurs.
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Offline Randy Powell

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Re: Continued Sturcture
« Reply #10 on: June 14, 2007, 09:39:32 PM »
Tom,

Well, I'm not quite done wiht the gear setup with the new plane so I'm putting up a picture here of the last one. This is basically the gear layout I'm using. The new one is a bit lighter and has a cool hatch cover over the gear wire.
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Offline Larry Renger

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Re: Continued Sturcture
« Reply #11 on: June 14, 2007, 09:55:19 PM »
Unfortunately many of the old magazine plans were this way, with rush to publication dates, changes to fit the page, and draftsmen, who although, very good at their art,  were not familiar with the details of the design. Thankfully most of the current publications have paid more attention to the details.

Beleive me this is a frustrating thing to the designer!  I sent several corrections back to a magazine that will remain unnamed and deceased, on one of my articles.  All the ink guy had to do was trace my drawing.  He had to "revise it" to his own aesthetic sense.  I resolved NEVER again to submit anything less than a final INK (well, now ACAD printout) version.

I even ran into trouble after that.  The editor wanted the "original" after I sent in the ACAD print.  I told him it was an "original", but he wanted the "ink" drawing.  I said that it was a CAD drawing, so that was as original as it could be.  He then replied "I hate CAD drawings, they look fake".  I sent him a clear Mylar print of the drawing, identical to the one he already had, and he was happy.  Go figure.
Think S.M.A.L.L. y'all and, it's all good, CL, FF and RC!

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Offline Randy Powell

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Re: Continued Sturcture
« Reply #12 on: June 15, 2007, 01:58:29 PM »
Larry,

While insightful, how does it apply to this thread?   #^

I suspect this should have gone in the thread about the Shoestring.
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