Grumman Ag Cat in 1:12 Scale - Page 2 - RC Groups
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Dec 21, 2011, 09:54 AM
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P. Tritle's Avatar

The Top Wing Began with the Center Section

The wings will plug in in pairs, with the center section being permanently attached to the cabanes. Again, there's nothing fancy here, just the standard "egg-crate" style spar and rib set up.
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Dec 21, 2011, 10:02 AM
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P. Tritle's Avatar

The Top Wing Panels

The wing panels are also of the "egg-crate" style construction, so they go together quickly. The tips are set up so that for those who want to go with the rounded style tips can by using the supplied tip plates. But if the preference is for the squared off style, simply cut the spars off outside the last rib and glue a 1/32 balsa skin over the end rib to stiffen it so the cover won't draw it in when shrunk.
Dec 21, 2011, 10:04 AM
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P. Tritle's Avatar

Filling In the Ailerons

The ailerons are built into the panels and will be cut out and shaped once the assembly comes off the board.

From here we'll shape up the top wing assembly, then get the bottom wing framed. Stay tuned, things are moving along quickly now!!!

Dec 21, 2011, 10:45 AM
Cobra Driver
RedTwilight's Avatar
Lookin Great! When can I order! LOL

One thing about the wing tips though. For the squared off version shouldn't that be another bay at the end of the wing instead of just cutting the spars flush with the last rib? That's the way I am going to do it. But it's no problem for me to cut out an extra wing rib. So that is what I'll be doing.

I am enthralled by the look of the extended tail/ rudder. So I may have to modify the plans and build that tail.

Got my card in hand waiting to order as soon as it's all finished up and ready to go!
Last edited by RedTwilight; Dec 21, 2011 at 11:39 AM.
Dec 21, 2011, 12:51 PM
Oh Yeah!
SteveC68's Avatar
WOOHOO! Can't believe I missed this one.
Dec 21, 2011, 02:11 PM
The Balsa Farmer
bassfisher's Avatar
Pat - looking great, Are you going to try to bring it to SMALL in 2012?
Dec 22, 2011, 02:49 PM
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P. Tritle's Avatar

Framing the Bottom Wings

The bottom wings go together just like the top except thet're quicker and easier without the servo mounts. The parts were all laid out and assembled, then pinned in place ofer the plans and glued.
Dec 22, 2011, 02:51 PM
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P. Tritle's Avatar

Finishing the Wing Assembly

After the major components were in place the leading and trailing edges were added. The root fairings were added last so that the wing conforms to the curvature in the fuselage when the wings are plugged in.
Dec 22, 2011, 02:54 PM
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P. Tritle's Avatar

Adding the Aileron Assemblies

The ailerons were assembled into the wing panels before the wings were lifted from the board. Then the last addition was the leading edge turbulator spars. At this point, the top and bottom wings are framed and ready to shape and sand.
Dec 22, 2011, 02:56 PM
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P. Tritle's Avatar

Finishing the Wings

The leading edges were carved and sanded to shape, then the entire assembly was rough sanded. The ailerons were removed and the final shaping done. The ailerons were then hinged and dry fitted onto the wing panels. The last step was then to add the brass joiner tubes on all four panels.
Dec 22, 2011, 03:00 PM
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P. Tritle's Avatar

Building Up the Cabane and Interplane Struts

The interplane struts were framed using the laser cut parts and sanded to shape. The Cabanes were vent to shape, jigged up and soldered together. Now we're ready to fit the wings.
Dec 22, 2011, 03:04 PM
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P. Tritle's Avatar

Fitting the Wings

The top wing C-section jig was cut from artists foam board and pinned to the fuselage centerline. The cabans struts were plugged in and the C-section taped to the jig. The wings were plugged in and the interplane struts dry fitted and the alignment checked. So far, so good. At this point, all those parts are starting to look like and airplane -- and a BIG airplane to boot!

Next up is to get the wing servos mounted and the wiring run in, then she'll be ready for the final detail sanding and cover.

Dec 22, 2011, 08:11 PM
It's a fine fiddly business.
Robert R's Avatar
The Ag Cat has big, burly, junkyard dog good looks. Loved how you made the root rib fit up with the fuse. This is a remarkable job on a remarkable subject.
Dec 23, 2011, 08:28 AM
Registered User
SMALL could be expensive this next year. An Ag Cat and a Storch (hopefully) and a ? and a ? and a ?. I can hardly wait!
Dec 23, 2011, 11:01 AM
Registered User
If anyone wants to give it the Maltone treatment, try this link


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