D18 tail section
So that's some reasons why all Jodels are made from wood. All 7000+ of them! More than half of them
were made industrially, but still, Jodel is the type of airplane that is most frequently built by amateurs.
And I'm sure we'll continue building them for years and years to come - for their excellent performance,
easy maintenance, wonderful flying and handling qualities, and maybe also for their longevity.
Most older Jodels, incidentally, are built of spruce and Okoume plwood. The latter being imported from the then
French colonies in Africa. Okoume (or Gaboon), according to the commonwealth Scientific Industial Research Organisation,
has a density of 25.5 to 28 lb/ cu. ft. Or in more sensible units: between 400 and 450 kg/m3. The
later Jodel models (D18 and onward) feature birch plywood, which according to the same source has a
density of 36 to 40 lb/ cu. ft. (575 to 640 kg/m3). Birch is therefore heavier, but has superior strength
in the mean time, due to its longer grains. (HT)