A different scale of weapon
Tallboy was Barnes Wallis’s 12,000-pound deep-penetration bomb. The RAF Museum’s account places its use against Tirpitz within the campaign by Lancasters of Nos.9 and 617 Squadrons. The weight is the bomb’s nominal overall class, not a claim that it contained 12,000 pounds of explosive. YT-T21
For this target, the important comparison is with the earlier carrier attacks: a different weapon, delivered by a different aircraft, against a ship whose condition had already changed.
A damaged ship at anchor
The postwar American technical report describes substantial unrepaired damage at Tirpitz’s bow before the November attack. That background belongs in any explanation of the final loss. A weapons comparison that imagines an undamaged ship would answer a different question. YT-T02
The report’s November reconstruction distinguishes one confirmed direct hit from two probable hits. It places the confirmed explosion beside the port engine room. Those categories are preserved here; the three entries are not presented as three equally certain observations.
From strike to loss
The same investigation reconstructs flooding, increasing list and capsize. Its evidence includes German reports and an interview with a former chief engineer who was not aboard during the final attack. It is a technical reconstruction, not a complete eyewitness log. YT-T02
Aircrew faced a different limitation: smoke obscured the results while bombing continued. YT-T06
Tallboy’s significance is clear without assigning every internal failure to a particular aircraft. Follow The Last Anchorage for the operation and What Did Tirpitz Change? for the strategic result.