On Friday, March 24, 2017 at 8:12:12 AM UTC-4, Pete Keillor wrote:
On Thu, 23 Mar 2017 19:05:00 -0400, "Phil Kangas"
wrote:


"Jim Wilkins" wrote in message
news
"DoN. Nichols" wrote in message
...
On 2017-03-23, Jim Wilkins wrote:
"DoN. Nichols" wrote in
message
...
On 2017-03-22, George wrote:
...
...I have a rotary converter which takes in 28
VDC at perhaps 20 Amps or more, and produces the 115 V
400 Hz 3
phase.
It also produces more audio noise than I like. :-)
...
DoN.

You need an R-2800 to mask the converter's noise.

I guess that it would -- but is a bit out of my budget,
and
probably the town would not let me run it very long. :-)

Enjoy,
DoN.

The operating cost for some of those old warbirds works
out to around a dollar per second.

I loved the sound of those A-1 Skyraiders at NKP!

Dad was a crop duster (in addition to rice, cows, and making levee
rollers). We ran R-985's on Super Ag Cats back then. I can still
remember the sounds of one catching and firing up. He'd often have me
or my brother run one at 1000 rpm to warm up, sitting with our feet on
the brakes. Especially after the brake lock failed on one and it
rolled forward until the prop hit a full oil drum. It threw that drum
about 50 yards, cut almost in two with big spiral slices. It made
quite a mess.

Pete Keillor

If you really want to hear the round engines talk, you need to be in the cockpit of a DC-6A on a cold day in AL. Doing engine runs after a few jug changes. The procedure after breakin was to take all 4 to max. takeoff power dry, and then throw all 4 water/meth ganged switches on the eyebrow panel. First time I witnessed it, it was a schock. It was rocking in the chocks and the whole aircraft shuddered. What mechanical music that was. P&W wrote the book on radials with the 2800. When I went to Boeing 767 school in Seattle, the instructors had deep respect for P&W. Called them the Pratt Iron Works in deference to their tough engines. My son is a PhD aerospace engineer and works for Pratt now designing mil. engines. And that's metalworking content.