Originally Posted by Dora-9
Such an elegant solution to the initial criticisms of the DHC-1A's lack of headroom
It wasn't only the lack of headroom ... I believe I'm correct in saying that there was a limitation placed on the wearing of the Mk2 Boredome by pilots occupying the front seat of the UK Mil Chipmunk. Lateral 'head turning' could be restricted by the visor mechanics on the side of the helmet. Additionally, when taxiing, the ability to see around the nose, even when weaving, could be restricted ... seen here.
Even the Mk1 Bonedome had to have the visor 'sliders' filed down to help prevent a spate of cracked perspex roof panels during aerobatics.
Originally Posted by Rosevidney1
Real reason behind having a framed canopy was because it incorporated a panel device that would assist the removal in the event of having to jettison the canopy.
That 'bungee' actuated flap was very effective in helping the canopy slide back.
Image Credit : Unknown