Sunrise 2540 (oz14840)

About this Plan

Sunrise 2540. Radio control sport trainer model. Designed for the HB .25/40 engine.

Note see also Begin-Air Trainer (oz11168) for what is essentially a high wing version of the same design.

Direct submission to Outerzone.

Quote: "If you want versatility in a design, you've found it. The Sunrise 2540 can be flown with anything from a .25 to a .40 cubic inch glow motor, and built with either a flat bottom or semi-symmetrical airfoil. Sunrise 2540, by Buzz Waltz

My sole purpose in designing the Sunrise 2540 low wing trainer was that l am a Sunday fun flyer and l like to fly low and slow as well as being able to do basic acrobatic maneuvers when I want to. With the flat bottom airfoil, the Sunrise does both of these things well.

Some of the important features in the design of this airplane are that you can use any power selection that you wish from a .25 to a .40 engine (hence the name). However, I designed the air-plane around the HB .25 engine. The HB .25 engine provides plenty of power as well as the economy of using a no-nitro engine. As you will see while you are building the wing, it is strong enough to take a .40 engine if you wish to do so.

The fuselage is wide enough to accommodate any radio gear that you might want to install.

Another feature that I have incorporated into the design is the use of a Dural main gear rather than the conventional wire landing gear which is always mounted into the wing. I have always liked the Dural gear and felt it is stronger and much easier to mount floats to at a later date for water flying.

The wing and fuselage areconstructed of balsa and plywood. The wood to make this airplane should be readily available from your local hobby shop.

If some of the parts that I have listed in the hardware section are not available at your hobby shop, have the owner substitute them with parts of another brand and similar quality.

I constructed the airplane using Satellite City Hot Stuff Super T and Hot Shot spray. On the firewall and landing gear mount and wing dihedral braces I used five-minute epoxy.

For your convenience, l have included a list of balsa and plywood materials that you will need to finish your Sunrise 2540. You might want to look it over after you have read the building instructions.

WING: The wing construction is very simple, and you can build both wing panels on the plans at the same time. As the wing has a flat bottom airfoil, there is no need for a special wing jig, thus building time is much shorter. You will need a building surface such as a flat table or workbench and a Celotex ceiling panel (for sticking pins into) for the top of the table.

The first step in building the wings is to cut out the wing ribs. Using three sheets of 3/32 x 3 x 36-inch balsa sheet, cut out 20 ribs. I do this by first making a master rib out of some scrap 1/8 ply that I have laying around the shop. I cut out the rib pattern from the pla nfr and I glue it to the 1/8 ply using 3M spray cement. Then, I cut out the rib and the various notches with my Dremel jig saw. Now that I have made a master rib, I lay the master on my sheet of 3/32 balsa and cut out each rib using an Uber Skiver knife with a No.11 blade.

Take two pieces of wax paper and put them over the plans. This protects the plans and prevents the parts from sticking to both the plans and the building surface after they have been glued together.

As I have previously mentioned, both wing panels may be built on the plans at the same time. Take your 1/16 x 3-inch sheet material and cut two sheets exactly in half length-wise to give you four pieces 1/16 x 1-1/2 x 36. This is your top and bottom trailing edge material. You are now ready to start building the wing.

Pin the 1/16 x 1-1/2 x 36 trailing edge piece in place on the plans. With a pencil, draw a line 3/16 of an inch from the aft edge of this sheet along the edge. This is a guide line forgluing on thel/4 x 1 tapered trailing edge piece, See plans for detail.

Using a wing rib as a gauge, butt the back of the rib up to the trailing edge piece and pin the bottom leading edge piece into place. Again using the rib as a guage, glue into place the top leading edge piece (3/8 x 3/4) making sure that the 3/4-inch side is in the upright position. See plans for detail..."

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