Electronics > Beginners
Think I can make it? (electric 9-pole radial engine replica)
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jpanhalt:
Do you have an indexing head?  Very useful and can be cheap, if you don't need a lot of precision and are willing to go used. 
jmelson:

--- Quote from: jpanhalt on April 19, 2018, 10:48:08 pm ---If so, I want to hear it.   My dad was with a B-29 squadron in WWII.

--- End quote ---
There's a guy who built a REAL 18-cyl miniature radial!  I saw it at the NAMES (North American Model Engineering Society) show a number of years ago.  He did not run it, however.  I did see a 5-cyl radial run, and it scared the HELL out of me.  They erected a Plexiglas shield around it, and people were milling all around in line with the prop.  I doubted the Plexi would stop a thrown blade.  It sounded quite impressive.

Jon
metrologist:
I remade a new rotor out of steel and just one flange. I am having a problem bringing the 12th magnet into position - it will jump on top of an adjacent magnet.  >:(
Audioguru:
I was 9 or 10 years old when I flew in a Super Connie. It had a lot of vibration and noise inside. Not much later Boeing 707 and DC-8 jets were much smoother.
IanMacdonald:

--- Quote from: Audioguru on May 11, 2018, 03:13:58 am ---I was 9 or 10 years old when I flew in a Super Connie. It had a lot of vibration and noise inside. Not much later Boeing 707 and DC-8 jets were much smoother.
--- End quote ---

Had a flight in a DC-3 (Actually the C47 variant) some time back. Surprised how quiet it was compared to the average light aircraft. One advantage of radials was that they were better balanced than inline or V engines. A disadvantage was the large frontal area which made them less suitable for fast aircraft. Oh, and a 4-stroke radial always has an odd number of cylinders in each bank. If you think about the firing order, it becomes clear why.

This one used the Wright R-1820 engines. Kinda awe inspiring to think this aircraft (which was still in regular commercial use)  had taken part in the Berlin Airlift. Might have been involved in D-Day too, but not sure.

Not the sort of plane to take if you're in a hurry, 180kt max operating speed and mostly cruises around at 120-140, but great for getting larger loads into short, rough fields. Which is why they're still used as there's no jet capable of a similar role.
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