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Author Topic: Thing III Build  (Read 4361 times)
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steveair2
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« on: February 05, 2017, 11:18:04 AM »

I was planning on building a sheet foam Alphajet MK II this winter.  Two day's ago by accident I found the Thing III  design online.  At first glance I knew I would be building one soon!  Yesterday after work I picked up a sheet of 1/4" balsa and stripped it down.  It took me a while to figure out the build sequence.  
I changed the hatch from a sheet balsa type to a framed type.  I also changed the aft central member from 1/8" x 1/2" to two 1/16" strips laminated together.
I did this because I didn't have 1/8" scrap in my scrap box like I thought I did.   The pictures show the build sequence, that took me about four hours last night.
This morning I raised the nose to four inches and fit and glued the forward keel.

I found the plans here  http://library.modelaviation.com/ma/1994/12/thing-iii
Wainfan is famous in the experimental aircraft world and the designer and builder of the Facetmobile.  

 http://www.facetmobile.com/
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Thing III Build
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« Last Edit: February 05, 2017, 11:32:20 AM by steveair2 » Logged
Konrad
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« Reply #1 on: February 05, 2017, 01:06:20 PM »

Looks good. How are you planing to power her?

As I recall there was a fad for a while where aircraft were built using just strip stock. I remember a series by Tom Hunt that was very successful. The ElipStick comes to mind.  

http://204.117.211.190/planelist.php?title=Tom%20Hunt%20Designs&desc=Tom%20Hunt%20Designs&type=tomhunt
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Cut it twice and it's still too short!
steveair2
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« Reply #2 on: February 05, 2017, 04:43:56 PM »

Thanks Konrad,
I have an Elipstick I built hanging on the wall, it was crashed on first hand launch and never repaired.  Not sure what size motor or battery yet.
I was thinking of covering it with Easy Built tissue but may use Solar film.  I was thinking transparent red and yellow.
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steveair2
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« Reply #3 on: February 05, 2017, 04:57:39 PM »

The entire bottom structure is built off of bulkhead A.  
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Konrad
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« Reply #4 on: February 05, 2017, 06:39:12 PM »

To my way of thinking this structure is a bit large and open for tissue covering.
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steveair2
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« Reply #5 on: February 05, 2017, 11:31:06 PM »

Thanks for the input Konrad.  If I did cover it in tissue I would use two layers, but still I think your right and am thinking I want to use the Solar film.
When I got home from work yesterday I had worked fifty eight hours at the plant.  I feel good with the progress I have made. 
I completed the top structure and then turned it right side up and installed the lower aft keel.



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Konrad
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« Reply #6 on: February 06, 2017, 08:34:11 AM »

58 hours! What was on fire?
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steveair2
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« Reply #7 on: February 06, 2017, 01:38:15 PM »

Seems typical for plant maintenance.  In our case we are rearranging the plant and prepping to install new equipment.  I'm moving to second shift today.
Second shift is only forty two and a half hours a week, I'm ready.   

Still trying to decide on a color scheme for my Thing.  Also considering power options.
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Konrad
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« Reply #8 on: February 06, 2017, 01:48:14 PM »

A week, got it. I feared it was straight!
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steveair2
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« Reply #9 on: February 07, 2017, 01:29:58 PM »

Cut and fit the top of former B.
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steveair2
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« Reply #10 on: February 08, 2017, 01:55:03 PM »

Completed aft truss B.
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Bill G
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« Reply #11 on: February 08, 2017, 11:13:02 PM »

Nice subject.  I was watching some videos, and it looks like an interesting model to fly.  Definitely an example of flat bottom wing, trim to speed flying.  Would be fun to experiment with programming mixes, to see how much it could be smoothened out.
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steveair2
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« Reply #12 on: February 11, 2017, 09:56:24 PM »

Thanks Bill,  that's exactly what I'm thinking.  With the light weight modern electronics and motors, this will be a very fun project.  
I've always been interested in low aspect ratio aircraft.  I'm trying to make as few modifications as possible and keep it light.  

I got bogged down with a seven day week at the plant and a funeral today.  Hope to make progress soon.
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steveair2
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« Reply #13 on: February 19, 2017, 10:47:49 PM »

It took me a while to figure out a good way to mount my servos.  I used the scrap piece from a lightning hole from a defunct Goldberg kit. The eighth inch light plywood made a good tray.   I use my heat gun to speed the drying of the Titebond glue that I've used throughout the build. 
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steveair2
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« Reply #14 on: February 20, 2017, 02:40:55 PM »

I decided I glued the servo tray in too high.  This morning I cut it out and lowered it to 1 1/2"  below the top surface.
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steveair2
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« Reply #15 on: February 20, 2017, 04:41:24 PM »

I finished bracing the servo tray and added a 1/16" x 1/4" strip to the lower keel.
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steveair2
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« Reply #16 on: February 21, 2017, 01:46:59 AM »

Somehow I managed to frame up the vertical stabilizers.
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steveair2
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« Reply #17 on: February 26, 2017, 03:08:17 AM »

Not much getting done due to work and some full scale projects going on.  I did order motor speed control and prop. 
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steveair2
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« Reply #18 on: March 01, 2017, 12:13:17 PM »

The plans show a solid two inch by one quarter inch elevator.  I framed mine from 1/4" x 1/4" stock.  Should be lighter.
I also plan to use elevons instead of the one piece elevator.

 
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Bill G
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« Reply #19 on: March 02, 2017, 02:09:32 AM »

Looks good.  I'll always replace solid tail feathers with framed.  Worth the lightening, as I built a few in my earlier days which required ballast.  I still see people using solid stock ailerons on micros, where weight savings is really important.  
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steveair2
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« Reply #20 on: March 07, 2017, 03:10:39 AM »

Thanks Bill!  I received my motor and speed control from Heads Up Hobbies.    http://www.headsuphobby.com/    They have a very informative site that has helped me being new to electric powered models.  I think I got greedy for power and ordered a motor and speed control that's heavier than what I want to use.  The ease of electric motor installation will allow me to easily change power systems.

I thought it would be neat to add a canopy so I went online looking for suitable canopies.  I ran across this site

 http://www.murocmodelmasters.org/canopy.pdf

PERFECT!  
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steveair2
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« Reply #21 on: June 12, 2017, 01:59:34 PM »

I'm finally getting some model building time.  The plans show a solid lower fin and rudder.  I built mine up.
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steveair2
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« Reply #22 on: June 13, 2017, 04:10:51 AM »

Tonight after work I put the rough elevons in between a 1/8" welding rod and a 1/4" strip of steel.  Then I sanded the elevons into a nice tapered shape.
I found some old CA hinges that were 1" x 1/2".  I decided to cut each hinge into a 1/4" x 1/2" piece, this gave me four hinges from one hinge.
Then I separated the elevons and installed the hinges.

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Bill G
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« Reply #23 on: June 13, 2017, 12:17:07 PM »

Looks like a nice jig method for sanding taper into framed elevator type surfaces.  I would imagine the rod works well, as the sandpaper shouldn't get caught against a sharp 90 degree edge.
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steveair2
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« Reply #24 on: June 13, 2017, 12:25:04 PM »

Thanks Bill.  Yes, the welding rod tended to roll underneath the sanding block.  I sanded from the rod towards the steel strip and the taper only took a few minutes to form.
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