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Old May 03, 2014, 06:30 PM
Thermite + ice = Big boom.
boaterguy's Avatar
Canada, ON, Ottawa
Joined Apr 2009
2,218 Posts
Build Log
Cessna 421 golden eagle.

This is my first ever airplane scratch build without plans so bear with me, there will be lots of questions.
So far I've got the wings cut and joined together, the plan is to have a removable wing, I haven't got far enough to figure out how.
My plan for the fuselage and motor pods is to print out the profiles, make formers, and hot wire it out of foam.
Are there any other ways to do this? I considered foamboard but it would be difficult to get the compound curves in the fuselage.
The pictures are scaled up 8 times for a ~45 inch wingspan.
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Old May 05, 2014, 07:39 AM
Thermite + ice = Big boom.
boaterguy's Avatar
Canada, ON, Ottawa
Joined Apr 2009
2,218 Posts
I've got the tail cut out now and started on the ailerons, will take pictures when I get home. Is there an easy way to calculate a safe cg to start at?
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Old May 05, 2014, 08:28 AM
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maurice076's Avatar
United States, MI, Warren
Joined Aug 2011
631 Posts
Hi,Here's the calc I use:
http://adamone.rchomepage.com/cg_calc.htm

You could try rolling the foam sheet over a edge to get rounded shapes also.
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Old May 05, 2014, 08:46 PM
Thermite + ice = Big boom.
boaterguy's Avatar
Canada, ON, Ottawa
Joined Apr 2009
2,218 Posts
Got the tail cut out and functional.
I'm done with one aileron and one flap, should I cut the flap so that it sits flush with the airfoil on the bottom or leave it flat? I tried cutting it once but I cut it too much and had to start over.
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Old May 06, 2014, 06:47 PM
Thermite + ice = Big boom.
boaterguy's Avatar
Canada, ON, Ottawa
Joined Apr 2009
2,218 Posts
Cutting the motor pods is hard. Any ideas on how I can hollow out the middle to place motor/ ESC/ flap servo in there?
Will leaving the flaps flat diminish performance or just make it look non- scale?
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Old May 10, 2014, 05:44 PM
Thermite + ice = Big boom.
boaterguy's Avatar
Canada, ON, Ottawa
Joined Apr 2009
2,218 Posts
Took a break from the cessna yesterday and came up with this. Let's hope it flies!
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Old May 11, 2014, 09:06 PM
Thermite + ice = Big boom.
boaterguy's Avatar
Canada, ON, Ottawa
Joined Apr 2009
2,218 Posts
Getting some of the fuselage done, control surfaces/ stabilizers mounted.
I need to figure out a way to mount the fuselage to the wing. The options are to cut the airfoil out of the fuselage and slide it in, or to cut the wing in half and mount it on the fuselage. I do have access to a CNC router so I can get the wing cut down a bit and then trim the fuse to fit. Thoughts?
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Old May 12, 2014, 06:19 PM
Thermite + ice = Big boom.
boaterguy's Avatar
Canada, ON, Ottawa
Joined Apr 2009
2,218 Posts
How would one go about linking the flaps and elevators? I want to save weight and complexity by only having one servo for the flaps and elevators instead of one for each.
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Old May 21, 2014, 07:58 PM
Thermite + ice = Big boom.
boaterguy's Avatar
Canada, ON, Ottawa
Joined Apr 2009
2,218 Posts
Got the wing and fuse done, just one motor pod left then the airframe is finished.
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Old May 22, 2014, 08:19 AM
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maurice076's Avatar
United States, MI, Warren
Joined Aug 2011
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Getting there eh.The flaps and elevators will need there own servo's since they do different jobs,and different channels on the rx.
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Old May 22, 2014, 10:19 AM
Thermite + ice = Big boom.
boaterguy's Avatar
Canada, ON, Ottawa
Joined Apr 2009
2,218 Posts
I meant joining the two flaps to work on one servo, and the two elevators to work on another servo.
Also : retracts, static gear or floats?
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Old May 27, 2014, 09:16 PM
Thermite + ice = Big boom.
boaterguy's Avatar
Canada, ON, Ottawa
Joined Apr 2009
2,218 Posts
Aileron and flap servos installed. I went with a "live hinge" on the flaps, using a sewing pin and hot glue to join the arm to the flap, works well.

Does the wood glue and sawdust trick work with foam dust?
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Old May 31, 2014, 09:50 AM
Thermite + ice = Big boom.
boaterguy's Avatar
Canada, ON, Ottawa
Joined Apr 2009
2,218 Posts
Getting closer!
I managed to hide the motor wires and ESC in the motor pod pretty well, it's hard to tell there's anything there!
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Old May 31, 2014, 08:01 PM
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Nice shape, looking for the maiden
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Old Jun 01, 2014, 07:41 AM
Thermite + ice = Big boom.
boaterguy's Avatar
Canada, ON, Ottawa
Joined Apr 2009
2,218 Posts
Might be a while, my receiver is on the slow boat from Hong Kong
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