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Old Apr 25, 2005, 05:50 PM
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Blue Funder v2.0 Build Thread

Due to numerous requests (OK, all 2 requests...), here are instructions on how to build what I believe is one of the best performing and easiest to build F3 planes available.

Items needed to build: 2 sheets Fan Fold Foam in one section. One carbon Fiber arrow shaft, or .25 CF rod. 4" motor mount stick. 1 plastic cable tie. Pushrod music wire, .032 or .047 works best.

First, using the folded over portion of 2 sheets of F3 as the leading edge, lay out a rectangle 27" x 6.75". Then, measure 9" in from each lower corner of this rectangle, make a mark on each side. Being careful to get a right angle, mark a 9" x 6" horizontal stab section. Mark out the ailerons and elevator to 1.25":
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Last edited by Robb; Apr 25, 2005 at 06:52 PM.
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Old Apr 25, 2005, 05:53 PM
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Janesville, WI
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Now flip the 2 sheets over and mark another rectangle 27" x 1.75":
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Old Apr 25, 2005, 05:57 PM
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Now, start cutting! Using a metal straight edge keeps your cuts at 90 degrees and helps to keep the blade from wandering. Make one shallow cut, then subsequent cuts to get through the foam. Replace your blade as soon as it starts dragging in the foam.
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Old Apr 25, 2005, 05:59 PM
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Now cut the ailerons and elevator free:
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Old Apr 25, 2005, 06:05 PM
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Fold the 1.75" portion back down and lay your carbon fiber rod or arrow shaft up against the edge. Mark a line spanwise against the rod. Carefully cut through just the foam's membrane and peel this section away by carefully pulling up one edge, and then rolling the membrane up with your rod or similar implement.
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Old Apr 25, 2005, 06:09 PM
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Find the center of your wing at 13.5" and make a mark. Now measure the width of your 4" motor mount stick and center it over the mark and cut free only the bottom wing portion to fit, ensuring that it is square to the centerline of the airplane.
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Old Apr 25, 2005, 06:12 PM
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Using hot glue, Elmer's spray, Elmer's white or whatever you're prefered glue, laminate the leading edge together. Two pairs of hands really helps:
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Last edited by Robb; Apr 26, 2005 at 12:11 AM.
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Old Apr 25, 2005, 06:14 PM
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Using hot glue or PU glue, lay the spar into place, tightly up against the foam.
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Old Apr 25, 2005, 06:19 PM
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Make your fuselage 14" long. 1.5" deep at the tail, 3.25" deep at about the spar line, with a nice curve towards the nose. Laminate 2 pieces of foam for the fuse, ensuring a square edge at the top of the fuse where it mates with the wing unit. Use 5 minute epoxy to attach it to the wing after making cutouts to mate to the motor stick and mount.
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Old Apr 25, 2005, 06:20 PM
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Make two 6" x 6" squares from scrap foam. Follow the dimensions in the pictures to make the vertical stabs. Peel away the inside portion of each fin. Then peel away .25" of film from each edge of the horizontal stab to get a solid base to glue the .25" balsa triangle fin reinforcement. Glue the triangle in place centered on the horizontal stab area with foam safe CA. Then glue the fins to each side ensuring that they are at right angles to the horizontal stab. Reinforce the joint with hot glue, more CA, white glue, etc.
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Last edited by Robb; Apr 25, 2005 at 06:26 PM.
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Old Apr 25, 2005, 06:28 PM
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Face the ailerons and elevator with .25" balsa triangle, this stiffens the surfaces considerably:
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Old Apr 25, 2005, 06:33 PM
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I use plastic cable ties for control horns. Use your hobby knife to poke a hole through the tie by twisting the knife until you just barely poke the blade through the tie. Test fit your pushrod until you can just get it through with a bit of effort. This keeps the connection slop-free. Cut into the foam and install the horn with hot glue or epoxy, making sure to center the hole over the hinge centerline.
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Old Apr 25, 2005, 06:37 PM
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Mount your servos as shown, and strap the rest of your gear to the fuse with hook and loop fasteners. Balance the model right in front of the spar, and tear it up! Original Blue Funder (With stars) and v2.0 shown.
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Old Apr 25, 2005, 06:41 PM
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Here's a VIDEO of the Blue Funder in action.
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Old Apr 25, 2005, 07:15 PM
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United States, MA, Springfield
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excellent,def. a must build
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