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00:14:15
00:16:20
00:14:15
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Transcription: [00:14:15]
{SPEAKER name="WERNER KARL DAHM"}
We had several structural people. In fact, Doctor Raithel, for instance, was one. Emil Hellebrand --

{SPEAKER name="MICHAEL NEUFELD"}
What was his name?

{SPEAKER name="WERNER KARL DAHM"}
Raithel. R A I er I T H E L --

[00:14:26]
{SPEAKER name="MICHAEL NEUFELD"}
Yes, I've heard the name.

{SPEAKER name="WERNER KARL DAHM"}
Emil Hellebrand was another --

{SPEAKER name="MICHAEL NEUFELD"}
Hellebrand

{SPEAKER name="WERNER KARL DAHM"}
Hellebrand, yeah.

[00:14:32]
{SPEAKER name="MICHAEL NEUFELD"}
Er, so you were basically involved in drawing up, uh, paper designs for A9, based on what your understanding of the last experiments from supersonic, from the wind tunnel, trying to [[crosstalk]]--

[00:14:52]
{SPEAKER name="WERNER KARL DAHM"}
We --[[crosstalk]] During my time we did not modify the configuration. We investigated, for instance, control of the investigation. One of the early works I did was calculating the rolling movements and the side wind at lift-off.

[00:15:15]
{SPEAKER name="MICHAEL NEUFELD"}
Right, um, but, uh, throughout that time you were not very confident that A9 would, was stable [[crosstalk]] at supersonic range and would glide when it came back?

[00:15:31]
{SPEAKER name="WERNER KARL DAHM"}
Initially [[crosstalk]] initially I was confident. I saw the center of pressure shift and I asked my boss about this, asked him is the control efficiency in the supersonic range so high that we can overcome this, and he said yes, and he may even have had this idea, because when you look at supersonic lift from linearized theory you find that the lift co-efficients close to Mach number 1 become very large; they go to infinity.

[00:16:08]
Simply because the theory is, is --

{SPEAKER name="MICHAEL NEUFELD"}
Theory is not very accurate --

{SPEAKER name="WERNER KARL DAHM"}
Not very accurate in that range. So he may have uh--
[00:16:21]