As a result of the data gathered on the size of the blast, the detonation height for the bombing of Hiroshima was set at to take advantage of the Mach stem blast reinforcing effect. The final Nagasaki burst height was so the Mach stem started sooner. The knowledge that implosion worked led Oppenheimer to recommend to Groves that the uranium-235 used in a Little Boy gun-type weapon could be used more economically in a Fat Man implosion-type weapon containing a composite core with plutonium and enriched uranium. It was too late to do this with the first Little Boy, but the composite cores would soon enter production.
as a result of the data gathered on the size of the blast the detonation height for the bombing of hiroshima was set at to take advantage of the mach stem blast reinforcing effect the final nagasaki burst height was so the mach stem started sooner the knowledge that implosion worked led oppenheimer to recommend to groves that the uranium-235 used in a little boy gun-type weapon could be used more economically in a fat man implosion-type weapon containing a composite core with plutonium and enriched uranium it was too late to do this with the first little boy but the composite cores would soon enter production