from 'Flypast' volume 2, which is a collected edition of 'Aircraft in Profile' :-
'Pregnant Perch'
"another anti-invasion experiment was the modification of L4673 to include a ventral gun position (also for beach strafing). As suggested by it's soubriquet, the resulting appearance was grotesque, but the experiment was in fact terminated when L4673 suffered an engine failure, the pilot, George Snarey, escaping unhurt after a difficult uphill crash landing under high tension wires."
'Midships Gun Turret'
"Yet another attempt to to provide extra firepower was the mock-up installation of a four gun poweer-operated turret immediately aft of the wing.As it was considered the wing so restricted the field of fire, this installation is believed not to have been flown before it was abandoned."
'Blackburn-Steiger high lift wing'
"For applied research purposes only, P1905 was fitted with a reduced span wing by Blackburns. Full-span flaps and slats were fitted and lateral control was acheived using wing-tip spoilers. designed about a single wing spar, the wing was swept forward 9 degrees and spanned only 38 feet."
'Tandem Wing Lysander'
"As one of a number of anti-invasion experiments to provide a beach-strafing aircraft, the first prototype Lysander,K6127, was provided with an entirely new rear fuselage, shortened to terminate in a power operated four-gun Boulton Paul turret (only a mock-up was ever carried), and supporting a wide-span tandem wing with large twin fins and rudders. Project design work was undertaken at Yeovil early in 1940 but detail work and construction was transferred to Harringtons, a coach-buider in Hove.
Initial flying was carried out by Harald Penrose who reported thta despite considerable aft movement of the c.g. the aircraft handled extremely well."
[note no mention of Delanne in this account.]
cheers,
Robin.