The Blohm & Voss BV 155 is a German high-altitude interceptor aircraft intended to be used by the Luftwaffe against raids by USAAF Boeing B-29 Superfortresses.

Work on such a high altitude fighter was begun by Messerschmitt, but in 1943 the project was passed to Blohm & Voss.

A requirement had arisen for a carrier-based single-seat fighter to be based aboard the aircraft carrier Graf Zeppelin, then under construction.

The undercarriage retracted inwards into wing wells, providing the wider track required for safe carrier landings.

Standard naval equipment such as folding wings, catapult spools, and arrester gear were to be fitted.

In order that all of that work on the Me 155 project not go entirely to waste, Messerschmitt adapted its design in November 1942 to match a Luftwaffe requirement for a fast single seat bomber.

[2] By the end of 1942, the increasing number of USAAF bombing raids and intelligence coming in about the new American B-29 bomber led the Luftwaffe to revive development of the Me 155B.

This engine change required that the fuselage be elongated in order to house the turbosupercharger aft of the pressure cabin.

In August 1943, the RLM realised that Messerschmitt was over-committed and transferred the design work to Blohm & Voss.

Blohm & Voss accepted the order only on condition they had complete design freedom and were not bound by Messerschmitt's work to date.

B&V gave it a new laminar flow wing and tail unit, landing gear from the Ju 87 and many other parts of the plane.

Further wind tunnel testing showed that there was a serious problem with the overwing radiators, at high angles of attack the wing "blanked" them from the airflow and cooling would suffer.

Tests with the V1 showed that the outboard radiators provided inadequate cooling, especially at high angle of attack.

However, the enlarged radiators changed the aircraft's center of gravity which required moving the pressurized cockpit forward.

Normal loaded weight ranged from 5,126-5,488 kg (11,300-12,100 lb), depending on the armament provided.

In parallel with the prototype development, Blohm & Voss had been working on additional changes under Project 205.

The new design would be simpler, lighter and faster, and plans were made to make it the standard version of the aircraft.

The clumsy wing-mounted radiators of the BV 155B were eliminated, and the main landing gear leg attachment points were moved inboard to retract inwards.