Electra (oz4539)


Electra (oz4539) by Vic Smeed 1953 - plan thumbnail

About this Plan

Electra. Radio control cabin model, for 2.5cc motors.

Quote: "Radio enthusiasts looking for the ideal model it should pass on quickly from this page, since this job is designed strictly for the radio tyro and far too stable for experts. In producing so stable a model, some penalty must be paid, and the chief disadvantage with this model is lack of smoothness when leaving turns. The dihedral is rather more than the expert would use, and it tends to jerk the aeroplane straight when the rudder is neutralised. However, this is not a very serious snag for ordinary sport flying and does, if anything, make learning to fly rather easier.

Other features of the design besides its stability are roominess and accessibility - helpful when wiring up for the first time - and extra-rugged construction. The original has been spiralled into the ground (due to a battery fault) with only very minor superficial damage, The building procedure is, moreover, so very simple that radio experts with little modelling experience should have no difficulty in producing a flyable model. If you are a novice with a 2.5 cc motor, looking for a tough sport job, then Electra without radio will give you several seasons' flying with a minimum of maintenance and repair work.

With radio and batteries installed the final weight should be 47 - 48 oz, and the model should balance on the rear spar or fractionally behind it. Glide test on a slight slope - in calm air it is necessary to run and launch the model hard, ensuring that the nose points down. Provided the glide is reasonable, power flights can follow two hand-glides, and should use the radio. Straight flight under power and on the glide is desirable, and a small amount of right sidethrust should be built in. Run the motor and check the radio, then launch as before. Do not key the transmitter until a safe height has been reached, and then do not hold a turn on for more than 90°. Generally, Electra should lose height to the right and gain to the left, although a prolonged turn will eventually lose height either way.

The main thing is to avoid the feeling that you have to control the model - if built reasonably accurately and somewhere near trim it will be quite happy flying along without you panicking. The amount of rudder shown on the plan is adequate for control but not too much to get you in trouble; it can be increased as your experience grows. Twice the amount shown produces quite a sharp turn and is as much as would ever be needed. Remember, neutralising is enough to stop any normal turn, but if you have let a spiral dive build up, opposite rudder will stop it; leave yourself plenty of height and you have nothing to worry about."

Quote: "I've noticed that we're still missing a few important models. Here's one. Built about a year ago and intended as an 'all weather' flier. Mine weighs half a pound more than Vic's original, so it's fairly fast but ultra stable. The PAW 19RC TBR starts in a couple of flicks and provides superb smooth power. A couple of hours of air time so far, and not a scratch. It's a superb aeroplane for beginners, at least as good as a J60 and quicker to build. As I have zero computer draughting skills, this is just my raw scan, at 600dpi. I hope you'll be able to get something reasonable."

Direct submission to Outerzone. Note this plan is scaled up from 1/6 size print which had hatched background, and is not easy to read.

Update 05/11/2013: Added CAD and PDFvector versions of this plan, thanks to hogal.

Update 19/04/2017: Replaced the hogalised PDFvector plan with an updated, revised version, thanks to Al.

Update 19/10/2020: Added a 2-colour vector BW version of the plan file, thanks to Miguel.

Supplementary file notes

Vector PDF.
Vector PDF BW print file.

CAD file

This plan is available for download in CAD format.


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Electra (oz4539) by Vic Smeed 1953 - model pic

  • (oz4539)
    by Vic Smeed
    from Aeromodeller
    April 1953 
    54in span
    IC R/C Cabin
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 22/06/2013
    Filesize: 1564KB
    Format: • PDFbitmap • PDFvector • CADfile
    Credit*: BrianCox, hogal
    Downloads: 3713

Electra (oz4539) by Vic Smeed 1953 - pic 003.jpg
Electra (oz4539) by Vic Smeed 1953 - pic 004.jpg

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Download File(s):
  • Electra (oz4539)
  • Plan File Filesize: 1564KB Filename: Electra_RC_smeed_oz4539.pdf
  • Supplement Filesize: 372KB Filename: Electra_RC_smeed_oz4539_article.pdf
  • Supplement Filesize: 185KB Filename: Electra_RC_smeed_oz4539_vector.pdf
  • Supplement Filesize: 130KB Filename: Electra_RC_smeed_oz4539_vector_BW.pdf
  • CAD Zip Filesize: 366KB Filename: Electra_RC_smeed_oz4539_cad.zip
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* Credit field

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This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.


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