On Sun, 26 Mar 2017 09:42:18 +0700, John B.
wrote:
On Sat, 25 Mar 2017 07:40:50 -0500, Pete Keillor
wrote:
On Fri, 24 Mar 2017 10:41:38 -0400, "Jim Wilkins"
wrote:
"Pete Keillor" wrote in message
...
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
http://www.avialogs.com/en/engines/u...t-engines.html
Thanks, I'll download that. I've seen a running 1/5 scale model. I
don't know if it had the supercharger.
Pete
The full sized '985 had a gear driven centrifugal supercharger as did
many radial engines. Perhaps more to ensure even fuel distribution to
the radial cylinders than to generate more power. If the 1/5th scale
model didn't then it's lower cylinders likely ran rich while the upper
cylinders ran lean :-)
It was probably in there. He even had a miniature of the PW emblem on
the oil sump between the bottom two cylinders.
Pete Keillor