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" Dear Mr.Brunmauer: You have asked me yesterday to submit to you in
writing my proposition to bring about a position of the torpedo
parallel to the wall of the ship, before the explosion. In working this
out,however,I became aware that the realization of this method is quite
impossible. It is impossible,namely, to bring the torpedo to rest in
working on it on such a short length which is available; the forces are
so tremendous that they must mechanically destroy the torpedo. If v
is the speed of a torpedo of the mass m,the negative accelerating force
K, the way of accelerationA, then K is given by the equation , mpur=
Ra If one puts f.instance m=100 kg. =10°% vs 25m = 255 -10°cm sek
sek 4=10 cm one gets E-adeh sueoiute units or 300 weight tons
(3+10°Kg.). It is clear that the structure of the torpedo cannot stand
this. The torpedo has therefore to be brought to explosion pefore
loosing its spneed. In 0,001 second it makes a way of 2,5 cme To be
sure the explosion should be finished before suneunkxrakxparxs
essential parts of the torpedo findergo deformation. It can f.i. be
arranged that the head of the torpedo can undergo a deformation of
appr. 10 om, without the rest of the torpedo being mechanically
deformed. This frontal part should contain empty space ( or a space
containing only air) to avoid that its deformation produces a
compression wave propagating backwards with great speed, The torpedo-
head would then look like this The empty space has the only
purpose to gain a few thousands of a second between the time of contact
with the ship's wall in which the fuse-mechanism comes into function
and the time in which the explosion is finished. " - Albert Einstein
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