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FOAM-RES F3RES Glider Design

by | Aug 19, 2019 | 0 comments

Gliding is a big thing for me at the moment. I have never really had a chance to try slope-soaring so most of my experience is with flat-field gliding – using either an electric motor or bungee to get into the air.

Whilst doing the rounds on YouTube I came across something called a “RES” glider. It took me until today to figure out it stood for “Rudder, Elevator, Spoiler”. More so, it is actually a German sport class called “F3RES” that is gaining popularity in Europe.

I would love to be able to build one of these machines, and maybe when time allows I will. But for now I was wondering if it would be possible to replicate the idea using foam board techniques.



F3RES Gliding

From my research I have discovered the FSRES was developed from the F3J class of glider competition. F3J models are large, highly technical beasties that can be EXTREMELY expensive. F3RES was envisaged as a way to make this type of competition accessible to all by keeping the models a managable size and with simple construction.

The basic rules are:

  • Models must not exceed 2000mm span and must be constructed predominantly of wood (i.e. no composite fuselages or skinned foam wings).
  • Control is rudder, elevator and spoiler only.
  • Launch is by bungee. No longer than 100m line and 15m rubber.
  • Flights are timed thermal events with landing bonus points for accuracy.
  • Flying wings and tailless designs ARE allowed.

Of course, this is a very brief overview. There is a good version of the rules (translated from German) HERE if you want to read more.


I’ve had a change of heart on this one. I realised I already had a smallish rudder/elevator glider in the Sunbird. A few high-start launches of that has shown me that it is unlikely I will ever be able to build a high performance RES glider from foam board.

If you do want to build a foam board glider I would suggest the Simple Soarer from Flite Test. I did and it came out really nicely.