Some people seem to dislike him - but I'll quote WM Green nevertheless!
"Battle experience had indicated that the frontal area of an Fw 190's radial engine - some seventeen square feet - provided a target which could be hit by an average gunner at a range of more than a thousand yards"
Hence, the solution of removing the engine!
" .. provided such a small target in a head-on attack that it would be virtually invisible to the bomber's gunners before it had actually opened fire with its 30-mm cannon"
Trials?
"Nineteen prototypes and two hundred production Bv 40s were ordered, and the Bv 40V1 made its first flight at the end of May 1944 towed behind a Bf 110. After modifications, a second flight test was made on June 2, 1944 at Wenzondorf airfield, but the pilot lost control and the prototype crashed. The second prototype, the Bv 40V2, flew on June5th, the third prototype was tested to destruction, and four additional prototypes had been flown when the programme was abandoned in the autumn of 1944."
So performance figures should be valid: Max dive speed, 560 mph; max speed of Bf 109G towing one Bv 40 344 mph at 19,000 ft., towing two 315 mph. Weights: Empty 1,844lb; loaded 2,094lb.