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Old Aug 02, 2012, 01:55 PM
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unclecrash's Avatar
white lake michigan
Joined Oct 2004
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Ah yes the finger tool. The guy who designed combat models f16, a10,f15, used what he called the sanding glove,or hand. He would put a latex glove on and trace his hand onto the back of the sandpaper,then he cut it out and sprayed it with adhesive and would stick it to his gloved hand. He would wetsand his planes after glassing throwing a bit of lite weight spackle onto the plane while wet sanding to fill the weave and sand all at once. Works great. Plane is looking sweet.
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Old Aug 02, 2012, 01:56 PM
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United States, CA, Lancaster
Joined Jan 2009
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Ive used this method before, but used Fomica. It has a pain to cut and edges kept breaking. So this time I will try to use Mat board. This is the material that is used for picture frames.
From past experience I had to make registration marks to keep the sections square. One thing that I will do differently is to cut the templates in half horizontally so I can have a square edge on the foam cores. Then assemble the bottom half sections over the plans and assemble the top sections on to the bottom assembly.
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Last edited by p901P901; Aug 02, 2012 at 02:03 PM.
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Old Aug 02, 2012, 02:01 PM
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white lake michigan
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Some of the very contoured shapes can be difficult to cut. Problem being you cannot see both templates at the same time to follow the patterns, seams you are getting better at it. I had a problem on the chimera with a few so I would take the bigger of the two templates and have it facing me. and make the first cuts away from the templates leaving some foam for a second and third run sometimes.
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Old Aug 04, 2012, 09:32 AM
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D_FAST's Avatar
Denver CO
Joined Apr 2008
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CoG calulations

I imported my cad into illustrator at real world size and drew out what i think the calculator wants. Does this look correct as far as my drawings?

The Green is my Canards
The Red lines are the Wing
I used 15% Static margin for the calculations.

Thanks in advanced.
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Last edited by D_FAST; Aug 04, 2012 at 10:50 AM.
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Old Aug 04, 2012, 07:54 PM
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United States, CA, Lancaster
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Use the 15 - 20% MAC of the main wing without the canard. Then CG should be about right. Remember this is a delta wing airplane so use calculations for this type of plane. .The canard AOA can contribute to how effective the other control surfaces are. And depending on how you fly, then the plane should be tail heavy . Some canard planes the CG is actually at the wing root. If your unsure build yourself a "chuckie" and see where CG should be.
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Last edited by p901P901; Aug 04, 2012 at 08:11 PM.
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Old Aug 05, 2012, 08:50 PM
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Denver CO
Joined Apr 2008
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Went out and flew this weekend had a great time flying the chameria! Everyone drools on it, when i bring her out. Quite a speed demon, and flys like on rails!

Back to the build,
CG glider was tested at real size, My calculations were pretty close to dead on!

Made easy 20ft glides with it. broke a few inches off the nose nothing major.

Got a few more hrs into the edf build as well.
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Old Aug 08, 2012, 07:50 AM
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Denver CO
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I think its time for some weight calculations and power plant considerations


Air frame glassed&primed - 14 oz
WemoTec Micro Fan x2 - 1.2 oz
Wicked 4800 kv x2 - 4.7oz
Pentium 40amp esc x2 - 2.3 oz
Spectrum AR600C receiver - 0.27 oz
3amp Bec - 0.35oz
Hitec HS-45HB servo x3 - 0.85 oz
2250 nano 60-135c 4s - 12.38 oz
Wire/extensions/linkage etc- 4.0 oz

Total 40oz OUCH!
I was hoping for something lighter as Im hand tossing this bird

Given dons wicked/wemo combo specs at about 480watt each for a total of 960watts. i should be some where around 380 watts per lb.
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Old Aug 08, 2012, 08:58 AM
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Crystal River Fl.
Joined Jul 2008
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Oh man, gettin heavy, like the Mig, but it may have more power, don't know the fan output power and wing fuse will lift more... w
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Old Aug 08, 2012, 12:28 PM
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Denmark
Joined Sep 2005
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Hey D

40 oz is not bad at all....

What airfoil are you using, If I remember correctly you live at high elevation, this will not help you. But you do have a lot of surface and with a airfoil whit some lift, you should be OK.
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Old Aug 08, 2012, 06:26 PM
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Denver CO
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Quote:
Originally Posted by frank40 View Post
Hey D

40 oz is not bad at all....

What airfoil are you using, If I remember correctly you live at high elevation, this will not help you. But you do have a lot of surface and with a airfoil whit some lift, you should be OK.
Mile High, and the heat wont let up, which wont help either.
I used a naca2088 that i slimmed down in my prints, got carried away with the build and ended up being sanded to a generic airfoil.

Flew the chimera last weekend in 100 degree temps, it was still moving, and its sitting at 320watts per lb.
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Old Aug 16, 2012, 05:31 PM
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Denver CO
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Here she sits waiting for me to start sanding down more filler to begin the glassing of the top and bottom.

Pretty damn happy at this point. 10.8 oz as is, including the tape, glassed and primed surfaces you see next to her.

I just might come in under that 14oz for the air frame i guess on earlier.
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Old Aug 17, 2012, 02:01 PM
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Denmark
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Looking good D, can't wait to see it in the air.
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