Nederlandse tekst

F4D, Open Scale Rubber


Open scale rubber models are almost exact scale models, but they have to fly at least 15 seconds. And not only the flight duration is scored but also the flight realism!


Maximum weight (including motor): 150 g
Maximum wing loading: 15 g/dm²
There are no restrictions to the dimensions


View or download the F4D Rules (0.3 Mb pdf).

The judging rules used for the F4D scale class are the BMFA-rules, which are also used in the Interscale and British Indoor Scale Nationals competitions.

Rules for all scale classes:
General scale rules [0.3 Mb]
Judges guide [0.3 Mb]

Rubber powered open scale model

   Interscale Homepage      IIFI Homepage     Classes      Information for participants      Contact      Links   

F4D- Open Rubber
F4E - Open Electric
F4E - Open CO2
F4F - Peanut
Kit Scale
Glider Scale
Profile Scale

last update: 5 oct 2017