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Old 01-13-2022, 03:03 PM
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scon10 scon10 is offline
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I like the engineering on the movements of ailerons and flaps. Clever!
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Old 01-13-2022, 03:55 PM
MacSongLi's Avatar
MacSongLi MacSongLi is offline
Join Date: May 2012
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That is a heck of a lot of very nice work in the internal workings. Well done.

"Fast is fine, but accuracy is everything" - Wyatt Earp

Design Group Alpha
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Old 01-16-2022, 10:51 AM
T haf T haf is offline
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Location: Southern Utah
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Wing Pt. 2

Here I've got the electronics for ya.

3 AAA batteries powered in series to a switch. From the switch is splits in parallel 3 different lines. The first one to the light board, and the second two to the motors that will go to the radial engine. I'm super happy with it. It worked the first time, no shorts or open circuits. Now I can work on finishing the skin for the wing. After that, I'll start on the engines.

The lights are wired to replicate landing lights, red and green navigation lights, and strobe lights.
Attached Thumbnails
Scratch Built Grumman Goose G-21A-20220116_090607.jpg   Scratch Built Grumman Goose G-21A-20220116_090625.jpg   Scratch Built Grumman Goose G-21A-20220116_090641.jpg   Scratch Built Grumman Goose G-21A-20220116_090713.jpg  
Working on a scratch built Grumman Goose G-21A
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Old 01-19-2022, 04:14 PM
Siwi Siwi is offline
Join Date: May 2012
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Factoring in the placement (and replacement) of batteries and wiring into a model design can be interesting. Do you plan to have a removable panel on the top of the wing in order to change them?

I like the design of the aileron mechanism (and all realistic moving parts in models) - might experiment with something similar to make sliding doors on trains. May I ask what tool you used to create the holes, and whether you strengthened the moving card parts in any way?
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Old 01-20-2022, 07:51 PM
T haf T haf is offline
Join Date: Apr 2020
Location: Southern Utah
Posts: 58
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Siwi, I'll start this one out by answering some of your questions.
Yes! there is a removable panel on the top of the wing. My wife was the one who came up with the latching mechanism too. She's pretty and smart!

The paper thicknesses.
I will typically use .5mm card double laminated to 1mm for the majority of my former and functioning parts. For example, inside the aileron is a 1/8" dowel running the length of it. Using my double laminated card I cut 4 strips to the correct size and glued all four 90 degrees off one another giving me the structure that would be needed to then wrap it all with a thinner standard card thus creating the complex aileron shape.
The tool I use for the holes is the newest addition to my tool collection. It's called a Japanese Press Drill or something like that. It comes with 9 tips of varying sizes spanning from 1mm-5mm in .5 increments. I got it off amazon for 70$. I can confidently say that it is the most impactful, valuable, and beneficial tool I own other than my x-acto knife. It offers me both holes for designs, aesthetics, and accurate small details as well as punched paper for bolts and other disk parts. I completely and whole heartedly recommend this tool.

Moving on with the build...

Here I've got for the what will be the second to last update about the wing. The wing is completely wrapped, there are no more formers showing. I've started on the engine nacelles, engines, and finished the electronics.

The wing may be the single best thing I've ever built out of paper. The joints are pretty tight in tricky areas. The functioning parts move with very little friction. The shape stayed true to my design. The engines look fantastic in my opinion; compared to my test engine I built earlier in this thread, they were exceptionally smaller and simpler. The hardes part in this update to build would have to be the wing nacelles that span back over the top of the wing. They were a challenge to get right.

Up next on the build is the engine cowling, which I've started. Then after that I need to build a latching system to attach and detach from the fuselage. Once those are complete I'll be able to paint it.

I'm not too sure on the paint scheme yet, but I'm leaning towards maroon and cream white.
Attached Thumbnails
Scratch Built Grumman Goose G-21A-20220119_070113.jpg   Scratch Built Grumman Goose G-21A-20220119_101445.jpg   Scratch Built Grumman Goose G-21A-20220119_181420.jpg   Scratch Built Grumman Goose G-21A-20220120_072123.jpg   Scratch Built Grumman Goose G-21A-20220120_142453.jpg  

Working on a scratch built Grumman Goose G-21A
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Old 01-21-2022, 04:46 PM
Isaac's Avatar
Isaac Isaac is offline
Join Date: Oct 2010
Location: Florida
Posts: 7,852
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Impressive work that will bring motion and pazaz to your model.

Great ideas.

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Recent buildsMig-Ye8, NA Sabre, A-4E Skyhawk,Mig-15 red, Mig-17 repaint, CRJ-200
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