The articles below are taken from Aeromodeller and Model Aircraft magazines from the 1950s to the ‘70s. Please bear in mind that the maximum rubber weight for F1B Wakefields has changed over the years and that the brands of rubber referred to in the articles are no longer available, but the principles remain the same.
As well as the re-prints here, there is more information as follows in the form of some of the papers in various BMFA Free Flight Forum Reports. All are still available: https://freeflight.bmfa.org/freeflight-forum. Other information is in Symposium Reports of the US National Free Flight Society.
Rubber Monograph Articles, click to download