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Pratt & Whitney Canada 5-engined Boeing 747SP spotted on Apron @ YMXVideo shot by Air-Clips.com showing a glimpse of the P&W Canada 5 engined 747SP testbed. Also a favorite, taxing Nolinor B737-200 gravel runner (www.fliegerfaust.com) More...
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That is how they test the smaller fans. I believe GE has done one as well, an old B742 if I recall. Add one small nacelle, and all of the appropriate instrumentation, and hey-presto, an instant moving test stand.
That looks so odd...
We did things similar when I worked at Cessna in the experimental flight dept. During Citation Mustang testing, we had the little PW615 engines on the RH pylon of our CJ2. Looked funny, but worked for testing. PW on one side, Williams on the other.
Got any cool pictures from your work there?
That 74 should see a doc about that abnormal growth :p. But seriously, it is an interesting way to test engines.
I bet it makes snappy left turns.