Bob_Young said:
I think what we're seeing here is the difference between a turbocharged engine, the JD4520, and a normally aspirated engine, the
L5030.
A normally aspirated engine is at the mercy of ambient atmospheric conditions. High elevation, high temperature, high humidity and even a low barometric pressure will detract from the density of the air-fuel mixture drawn into each cylinder. Hp will decrease accordingly. Sarasota is near sea-level, but the climate there is rather warm and humid.
The boost on a turbocharged engine can be easily set to counteract these factors. The turbocharger will pack just as much air-fuel mixture into an engine in hot/high/humid conditions as it will in cool/dry conditions at sea level. That also explains why the JD HP output stayed relatively constant from day to day while the 5030's varied.
Obviously, a turbocharger has advantages in terms of delivering all the HP paid for all the time. On the other hand, it is an added item of expense; both at initial purchase and in terms of maintenance over the tractor's lifetime.
FWIW
Bob
Exactly - and that may be all Deere was demonstrating for the sales people - the advantage of the Deere turbo charged tractor against competitor's normally aspirated unit. Again - I'm not naive, I just don't buy into the cynicism constantly shown about something as simple as a tractor demonstration.
Which, by the way, was reported from the perspective of a SINGLE person. His reaction to it cannot be extrapolated to the other people attending the meeting.
If it was a REAL conspiracy, at the very least, I'd expect to hear that Halliburton, a 3-letter government agency, extra terrestrials, or UFO's were involved in some way.
Let me give you an example, and please bear with me.
About 25 years ago I was employed by a company that ran a test range in central Nevada for the US Government. I was asked to design an "overt warning system" for a site at the test range. I flew to Las Vegas, and the next day took the early morning charter commuter flight to the site.
I arrived at the site, met my contact and went out to look at the area. It was a double row of aircraft hangars lined up in a north - south direction. They were oriented so they were facing each other and seperated by a wide taxi lane area.
As all the hangars were the same, I only needed to see the interior and exterior of one hangar. We went into the first hangar. Inside were two F117 stealth aircraft. I found out that the system I had to design was to warn the pilots and crew not to take the aircraft out of the hangar; or if they had the aircraft outside the hangar to get them back inside.
I went back to my office, designed the system and sent the plans to our Las Vegas office. About 6 months later, I got a call from my site contact who asked that I come back and inspect the installation and "tweak it."
I flew out on a Sunday with my test equipment to start work early Monday morning. I worked from 7:00am to after 4:00pm for three days. On Thursday, about 11:15am I took a lunch break and went to see my contact. I told him I only had the final two hangars at the south end and the system should be ready for testing on Friday morning.
He then said, "Have you done the other hangar yet?" I replied, "The..'other'...hangar?"
With a flat, low voice he said, "I'll show you after lunch."
As we walked down the row of hangars after lunch to retrieve my test equipment - I was dreading having to spend another day at the Nevada-hot facility because of "the other hangar." The hangar that was NOT shown on any of the site drawings I was given, was not part of my test plan, and now appeared seemingly out of nowhere to ruin my weekend.
We rounded the corner of the last hangar at the southwest end of the row, and set back from the taxiway was a huge hangar, at least four times the size of the the other hangars. Terrific, I'd probably be there working over the weekend and at least Monday and Tuesday of the next week.
We stepped through the personnel entry in the hangar door, and in front of me, at least 60-feet in height, was a silver grey aircraft...blimp... I couldn't really tell.
It had curved surfaces in every direction that met in a horizontal edge running around the middle of the aircraft. There were no obvious windows, hatches, or doors.
We walked around the edge of the aircraft following it's contour, and it became evident that the craft was shaped something like a stingray. Wide at the front and tapered toward the back. As we approached the rear of the aircraft I could see writing or a graphic of some kind about half-way down the side.
When I was close enough to see what was on the side of the craft, the hair on the back of my neck stood on end. There on the side of this....whatever...was a yellow rectangle with slightly bowed sides. In the middle of the rectangle was a yellow leaping deer....
Now, that's a conspiracy....
