As the time did not appear appropriate, effort was concentrated on the production of wooden airscrews, with the intention of using plastics and compressed woods for the same purpose at a later date.
The company's principal business was the development and production of airscrews[2] using its Hydulignum laminated wood process to form the propeller blades.
Permali Gloucester Limited now concentrates on composite materials using glass and aramid fibres, and used in defence and medical markets, and is privately owned following a management buy-out in 1998.
Permali Deho Limited is owned by a German company, and continues to make laminated wood composites.
Rupert Wasey, CEO of Hercules Propellers and Hordern Richmond received an archive of over 100 original technical drawings for Hordern Richmond designed aircraft propellers, dating back to the late 1930s, The drawings had seemingly been lost for over half a century.