Electraglide III (oz14263)

 

Electraglide III (oz14263) by Jim Zare 1998 - plan thumbnail

About this Plan

Electraglide III. Radio control sport sailplane, for electric power with Graupner Speed 600 and 2.8:1 gear drive.

Quote: "An attractive sport sailplane powered by the Graupner Speed 600 with 2.8 to 1 gear drive. Electraglide III, by Jim Zare.

This is the third version of the Electraglide electric-powered sailplane family. The first version. Electraglide 62 (oz5272) appeared in the August 1975 issue of RCM. The Electraglide II (oz7683) was featured in the June 1985 issue of RCM and was kitted by Midway Models for several years (recently re-released by Aveox.)

The original Electraglide 62 was retired years ago but the first Electraglide II is still flying after almost 14 years of usage. It originally used Leisure and Astro Flight 05's for power. During the past few years, it has been powered by Graupner Speed 500 direct drive motors. I experimented with a Graupner
Speed 400:(7.2 volt) gear drive with the 4:1 reduction and a Graupner 12 x 10 folding propeller. This provided a gradual climb and a majestic glide. I also tried a Speed 500 with 2.8:1 gear drive on the same model and it was way overpowered.

In early 1996, I decided to enlarge the original model to a wingspan of 85' with 660 sq in of area in order to use either the Graupner Speed 500 or Speed 600 I gear motors and maintain a reasonable wing loading. The result is an attractive sport sailplane designed for those balmy summer days with their cumulus clouds and endless thermals.

Design Features: The Electragiide III is an enlarged and improved version of the Electraglide II. The basic design intent was to use exactly the same dimensional materials for each surface, spars' trailing edges, etc. The hope was to replicate or improve the same wing loading as the previous model.

Some of the features carried over from the previous version are a one-piece, D-spar wing with a flat center section with tip dihedral. This eliminates the plywood dihedral braces at the center of the wing and totally eliminates the weight and complication of tubes and wire required for two-piece wings. This, in itself, saves several ounces of weight.

Carbon fiber, not available in 1985 is used to reinforce the top and bottom wing spars in the center section. The resulting wing is super strong, and yet quite light.

The fuselage was again designed with a tube motor mount to match the spinner that comes with the Graupner 12 x 10 folding propeller. The extra weight and complication of a hatch is eliminated in the design. The width and length of the battery radio equipment area was carefully measured to allow for the installation of virtually any flight battery, receiver, speed control, and servo combination in use today. Again, the carbon fiber reinforcements are designed into the rear fuselage sides. These were a weak spot in the Electraglide II (and most other balsa-sided sailplanes).

The resulting Electraglide III is easy to build and a joy to fly!

Construction: Stabilizer/Elevator: Pin down the 3/16 x 1/4 balsa leading and trailing edges. Glue S-1, 3/16 balsa center in place, along with the two S-2 stabilizer tips. At this point, epoxy the 3/16 sq spruce torque rod to the two elevator halves and temporarily spot-glue the elevator asembly to the trailing edge. I use about one drop of CA at each tip and another drop in the middle.

Add the diagonals and sand the entire stabilizer assemble to a streamlined cross-section, starting with 100 grit sandpaper. After sanding with 240 and 400 grit sandpaper..."

Direct submission to Outerzone.

Scan by MarkD, cleanup by Circlip.

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Electraglide III (oz14263) by Jim Zare 1998 - model pic

Datafile:
  • (oz14263)
    Electraglide III
    by Jim Zare
    from RCMplans (ref:1246)
    February 1998 
    85in span
    Electric Glider R/C
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 29/11/2022
    Filesize: 407KB
    Format: • PDFbitmap
    Credit*: MarkD, Circlip
    Downloads: 695

Electraglide III (oz14263) by Jim Zare 1998 - pic 003.jpg
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Electraglide III (oz14263) by Jim Zare 1998 - pic 004.jpg
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