Spirogyra (oz5665)


Spirogyra (oz5665) by Richard Evans 1972 - plan thumbnail

About this Plan

Spirogyra. Richard Evans' CL stunt/combat trainer. Free plan with Aeromodeller, October 1972.

Quote: "SPIROGYRA was originally envisaged as a stunt trainer, for a school flying club, which would be capable of simple basic manoeuvres and able to bounce out of a hefty prang without any major damage. The prototype possessed both of these qualities and in actual fact could perfonn nearly alt the aerobatics in the S.M.A.E. schedule with the exception of triangles. With a suitably balanced model, squares are quite easy - the only problem being that it nips round them rather fast, making quick reactions essential. Line tension is good at all times due to the assymetric wing and large fins which are offset across the fuselage for this reason. A variety of these models has been built powered by PAW 1.49s, OS LOs and Fox 15s. My personal favourite, however, is still the original powered by an Enya 09 which seems to be the ideal power plant. The mustard tin tank detailed on the plan gives a very consistent 5-6 minute run with this motor, but I would not recommend its use with a diesel as the engine is mounted a little way from the tank and fuel surge seems to affect diesels more than glows, particularly with the smaller engines. Construction should present no difficulties to those with even minimal experience, provided the following guidelines are followed..."

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Supplementary file notes

Planfile includes article.


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Spirogyra (oz5665) by Richard Evans 1972 - model pic

  • (oz5665)
    by Richard Evans
    from Aeromodeller
    October 1972 
    30in span
    IC C/L Trainer
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 18/06/2014
    Filesize: 948KB
    Format: • PDFbitmap
    Credit*: stormin
    Downloads: 1845

Spirogyra (oz5665) by Richard Evans 1972 - pic 003.jpg
Spirogyra (oz5665) by Richard Evans 1972 - pic 004.jpg
Spirogyra (oz5665) by Richard Evans 1972 - pic 005.jpg

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User comments

In case anyone wants to build this one, if you follow the instructions as laid out in the article you'll find it's impossible to slide the fuselage over the wing! If you slide it from the inboard side, the pushrod is in the way, and if you slide it from the outboard side, the fuel tank is in the way.
Unfortunately I only discovered this after completing the wing. The only way I can see to do it would be to leave either the pushrod assembly or fuel tank off until after the fuselage is in place, then add the pushrod/fuel tank and complete the centre section sheeting afterwards.
Lesson learned.
Robin Lewis - 27/10/2022
Photos of my completed Spirogyra [main pic, 004, 005].
Robin Lewis - 29/07/2023
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