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Transcription: Transcription [00:22:32]
[00:22:32]
{SPEAKER name="MICHAEL NEUFELD"}

So you, you built the Wasserfall test stand, and then I wasn't clear exactly what your job was next, in late '43, -- the test stand was finally finished for Wasserfall engines. You didn't test-- When did you first test a Wasserfall engine? Do you know?
[00:22:50]

Was that immediately after you were gone, gone from that job?
[00:22:54]

{SPEAKER name="KARL HEIMBURG"}
That, that, must have been already in '44. I'm not sure. End of '43 or beginning of '44.
[00:23:04]

{SPEAKER name="MICHAEL NEUFELD"}
Do you know anything about the success of that early test with that larger—-

{SPEAKER name="KARL HEIMBURG"}
We had no major problems, we had problems, but these were not major ones. They had problems which could, could be resolved easily.
[00:23:17]

{SPEAKER name="MICHAEL NEUFELD"}
Yeah, because of course, part of it was that the injector plate was finally fixed for Wasserfall.

{SPEAKER name="KARL HEIMBURG"}
Yeah, yeah, right, right.
[00:23:26]

{SPEAKER name="MICHAEL NEUFELD"}
But that didn't prove to be as large a prob—-

{SPEAKER name="KARL HEIMBURG"}
We had two or three designs of the injector plate, and worked them out.
[00:23:34]

{SPEAKER name="KARL HEIMBURG"}
And strictly by how much of a vibration do you get, and took.
[00:23:41]

{SPEAKER name="MICHAEL NEUFELD"}
Do you know whether-whether you ever had much success with the injector plate on the A4-sized engines' tests. I'm not clear on whether they stopped doing that.

{SPEAKER name="KARL HEIMBURG"}
We, we succeeded in late, in 1944,—-
[00:24:02]

{SPEAKER name="Karl Heimberg"}
with an injector plate for the A4. That we could say, now this is a way how we can do it. We had to cool it. And then it was real quiet, real quiet. We were surprised ourselves.
[00:24:20]

{SPEAKER name="KARL HEIMBURG"}
But that was late, and you know to get that in production, that takes quite some time.
[00:24:27]

{SPEAKER name="MICHAEL NEUFELD"}
I know, in fact, effectively that, trying to reduce a second design for the A4 motor was really sidetracked by the pressing need to mass produce the original design.

{SPEAKER name="KARL HEIMBURG"}
That's right, that's right.
[00:24:40]

{SPEAKER name="MICHAEL NEUFELD"}
But—-

{SPEAKER name="KARL HEIMBURG"}
We had too much to do on the test stands any how, so you-you could not make time on the test stand for that problem because you had more pressing problems with the A4 compromise design. The 18, 18 pots, as we called it.
[00:25:05]

{SPEAKER name="MICHAEL NEUFELD"}
So, when you-when you finished the Wasserfall test stand, you immediately went, were assigned in some way to the problem of mass producing the — A4 engine?

{SPEAKER name="KARL HEIMBURG"}
The difficulties which came, ja, which came up with the mass production, came up with the test stands, the test facilities, and—
[00:25:26]

Transcription Notes:
They are discussing Project Wasserfall, which worked to create the Wasserfall Ferngelenkte FlaRakete (Waterfall Remote-Controlled A-A Rocket).