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Old Jul 10, 2005, 12:25 AM
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Simple Cheap J-250 Pusher- Build Thread & Free Plans


Over the last few months to my surprise the most popular plane on my website has been this little J-250 powered pusher design. That prompted this build thread.

A little history- Last fall I wanted something that was quick to build for using in combat so I came up with this design. They were great fun. Eventually I also taught two people how to fly using them since they are stable and durable. I've built about 10 of these now, in slightly different versions.

It wont 3D and it's not a rocket, but it's a simple, quick, fun to fly little parkflyer.

Free plans are on my website www.pinkfoamplanes.com/cp.html There's AutoCad and PDF versions on there now.

The build thread will follow-
Last edited by flybike; Jul 10, 2005 at 01:25 AM.
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Old Jul 10, 2005, 12:30 AM
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Cut two fuselage sides from fanfold foam.
Old Jul 10, 2005, 12:36 AM
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Glue them together.
Old Jul 10, 2005, 12:52 AM
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Here's the tricky part- cut out the wing panels. Feel free to make the wingtips rounded or any other minor changes to the wings- it probably wont affect flight characteristics at all. Now get a mailing tube or something round to bend them on, then heat them up with a heat gun and bend a nice airfoil into the wing panels. You can use the top of the fuselage as a guide.

Once the wing panels are curved nicely you're almost done.
Old Jul 10, 2005, 01:03 AM
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Glue them together. Put a soda can under one wingtip for dihedral. You'll have to carve a little bit of the wing root to make them join nicely.
Old Jul 10, 2005, 01:09 AM
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Build yourself two of these, they will help for the next step. These are really complicated..
Old Jul 10, 2005, 01:16 AM
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Put one of those can towers under each wingtip in this step.

Glue the wings to the fuselage.
Old Jul 10, 2005, 01:18 AM
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Looks interesting.
Old Jul 10, 2005, 01:21 AM
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Cut two little braces from fanfold foam. Then glue these in under the wing.
Old Jul 10, 2005, 01:29 AM
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glue in your stabilizer, then hinge the moving parts with clear tape
Old Jul 10, 2005, 01:38 AM
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Glue your motor on to the top of the wing. You might need to glue in some shims to get it level.

The second picture shows the location of the battery.

The idea of this plane is to use old equipment that you dont use anymore, that's why I'm using an old brushed motor and a Gen 1 lipo. I usually use 8 cell nimh batteries for combat just in case they happen to hit the ground..
Old Jul 10, 2005, 01:41 AM
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Well, that's enough for tonight. Tomorrow we'll install the rest of the electronics and go fly. Any questions? Comments, suggestions?

-Hans
Old Jul 10, 2005, 02:35 AM
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another beauty for us to behold and to try. Thanks flybike! ( Hans)

Robert
Last edited by willin; Jul 10, 2005 at 02:36 AM. Reason: spelling
Old Jul 10, 2005, 08:28 AM
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Looks great and simple, Hans. Love the callibrated blocks for assembly

What's that, a 4025 prop?
Old Jul 10, 2005, 09:33 AM
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HELL no you cant fly it!
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Classic flybike. The soda cans I mean!


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