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Old 08-31-2018, 07:07 PM   #6481
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Originally Posted by 05CrewDually View Post
The KOA in Bar Harbor, Maine had sites that required that kind of lift just to get close to level. Alot of motorhomes were hanging the front wheels.
My site was so unlevel that our 5er hitch was too low to back under, the back bumper was almost 4' high, and the left side tires were completely off the ground, which I took advantage of and checked for bearing play.


You get the lobster delivered to your RV at Bar Harbor KOA

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Old 08-31-2018, 07:09 PM   #6482
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Originally Posted by CAT-RN View Post
You get the lobster delivered to your RV at Bar Harbor KOA

RussellAttachment 185032Attachment 185033
I picked them up! The pulled pork sold out every night fast.Click image for larger version

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Old 08-31-2018, 07:18 PM   #6483
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Originally Posted by Cowracer View Post
Theres no substitute for cubic amps.

Ok, in every engineer there is a frustrated teacher just dying to get out, so heres one chance for me.

Electric motors are ideal for pulling heavy loads. That's why all locomotives use them as the final drive. Due to its design, electric induction motors produce their maximum torque at zero speed. Just perfect for getting a heavy load moving. Torque decreases as the motor speeds up, approaching zero torque at synchronous speed.

Synchronous speed is a function of frequency (Usually 60 hz in the US) and the number of poles in the motor. The math boils down to 120x60 (freq)/number of poles. A motor can only have even numbers of poles, so a 2 pole motors sync speed is 3600rpm. A 4 pole is 1800, a 6 pole is 900 and on and on. Were you to energize a motor with no load on them, they would run at that speed and produce zero torque. Of course, with zero torque, any load applied to them will slow the motor down. As it slows down, torque is produced and at some point the load and torque will balance. The nameplate of the motor will list it speed at it's rated horsepower. Usually a 4 pole motor will run somewhere around 1730rpm. The difference between the sync speed and the actual speed at rated HP is called slip and is determined on how the motor was made. That speed is solid. You can't vary the speed by changing voltage. Like I said, its a function of how the motor was made, and the frequency of the power coming into it. So how do you vary the speed? A neat little device called a Variable Frequency Drive (VFD) that bacically converts the incoming 60hz AC into DC, then forms that DC back into AC and whatever frequency you want. Vary the frequency, vary the speed. They make a distinctive, high pitched noise when running. I've worked with them enough that I can tell if a motor is VFD controlled or not just by standing by it.

Torque and Amps are practically interchangeable in an induction motor. As you add load, the motor slows down from synchronous speed, torque is generated and the amps go up. At rated load, the expected amp draw is called Full Load Amps (FLA) and is listed on the nameplate of the motor. At zero speed the motor will make its most torque, and also use the most amps. This is called "locked rotor amps" and is usually about 400 times the amp draw at full load. It can be quite alarming watching the amp draw on a motor starting a heavy, high inertia load like a big fan or pump. Any electric motor will gleefully make many times its rated horsepower. The only limit is for how long. A starter motor in your car might make 15HP but only for 30 second at a time before it overheats. It is very small, weighing in at about 25 pounds. A 15 HP industrial air-cooled motor rated for continuous use weighs about 270 pounds. Tesla motors are more powerful and lighter because of advanced cooling practices.

Tesla's are cool, but the car i admire the most is the Chevy Volt. It's a true hybrid, meaning that the ONLY motor driving the wheels is the electric one. The gas engine only runs a generator, providing power to the traction motor and charging the batteries. That is pretty much how a diesel-electric locomotive runs and I bet you will see a LOT of 'electric' cars coming with a small gas engine/generator in the future.

Tim
Your post only applies to AC induction motors. You take that diesel/electric with a DC generator and re-wire the generator to work as a motor and you can change the speed by changing the voltage.

I operated a car shredder that used two GE-D32RR generators coupled end to end. The output was 2000 hp turning a 16,000# rotor at 600 rpm. 1 volt dc equaled 1 rpm. The voltage input was set at 600 vdc at 2000 amps with no load. When a work load was applied the voltage would drop while the amps increased up to 5000 amps. The slowest I recall those motors turning while pulling max amps was 50 rpm. At some point above 5000 amps the motors would stall.

These motors were controlled by Siemens SIMOREG CM 6RA70 Series Control Module for Variable-Speed DC Drives. The motor speed could be changed on the fly by increasing the dc voltage setting in the programming parameters using Siemens DriveMonitor on a laptop.
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Old 08-31-2018, 08:12 PM   #6484
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No it was sitting like that for 3 days.


I have had to do this to get level is certain campgrounds. Now I try to get at least some of the weight on wood or blocks of some kind.
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Old 08-31-2018, 08:14 PM   #6485
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Those front tires are waaay off the ground.




Training it to do wheelies.

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Old 08-31-2018, 08:27 PM   #6486
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Middle unit is water softener. I have one and wouldn't be without. Best $300 investment you can make for an RV.
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Originally Posted by Oakman View Post
Some serious water treatment going on here. I saw this at a KOA Kampground in Kankakee, IL.

Attachment 184714
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Old 08-31-2018, 08:55 PM   #6487
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Back to our regularly scheduled program. I found a whole nest of tent people. They werenít there. It reminded me of that movie ďPodsĒ. Attachment 184903


Cocoon, old movie from the 80ís
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Old 08-31-2018, 10:02 PM   #6488
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We stayed overnight in a Camp Ground outside Hershey Pa. That site would have been one of the level ones. Ours was so high in the front, I could have dropped the engine out the bottom!
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Old 09-01-2018, 04:17 AM   #6489
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Cocoon, old movie from the 80ís


Yep. Thatís the one.
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Old 09-01-2018, 06:50 AM   #6490
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Yep. Thatís the one.
Or Invasion of the Body Snatchers, which has been remade a few times.
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Old 09-01-2018, 11:00 AM   #6491
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I couldn't get a picture but some probably 14 year old kid just attempted a donut in a golf cart. He had no clue how to handle it and came within about an inch from hitting this guys brand new f350.
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Old 09-01-2018, 11:07 AM   #6492
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Old 09-01-2018, 11:18 AM   #6493
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Originally Posted by Cowracer View Post
Theres no substitute for cubic amps.

Tesla's are cool, but the car i admire the most is the Chevy Volt. It's a true hybrid, meaning that the ONLY motor driving the wheels is the electric one. The gas engine only runs a generator, providing power to the traction motor and charging the batteries. That is pretty much how a diesel-electric locomotive runs and I bet you will see a LOT of 'electric' cars coming with a small gas engine/generator in the future.

Tim
Tim, thanks for the excellent write up. I have a Gen2 Volt right now and a Gen1 Volt before that. I did my research, and agree, it is the best of the EV's out there right now. The Tesla's are amazing and I have driven every model, but until you solve the range and re-charge issues, they are not suitable for long range travel. This past spring, while towing across Texas on I10, I got passed by the same Model S three times in one day.
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Old 09-01-2018, 11:21 AM   #6494
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Middle unit is water softener. I have one and wouldn't be without. Best $300 investment you can make for an RV.
Probably helps with the Water heater corrosion but what else?

I canít seem to follow the flow. My OC disorder is playing havoc with my logic which does not realize that not all lines are showing.

Sigh. Oh, pretty, pretty.
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Old 09-01-2018, 11:23 AM   #6495
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Your post only applies to AC induction motors. You take that diesel/electric with a DC generator and re-wire the generator to work as a motor and you can change the speed by changing the voltage.

I operated a car shredder that used two GE-D32RR generators coupled end to end. The output was 2000 hp turning a 16,000# rotor at 600 rpm. 1 volt dc equaled 1 rpm. The voltage input was set at 600 vdc at 2000 amps with no load. When a work load was applied the voltage would drop while the amps increased up to 5000 amps. The slowest I recall those motors turning while pulling max amps was 50 rpm. At some point above 5000 amps the motors would stall.

These motors were controlled by Siemens SIMOREG CM 6RA70 Series Control Module for Variable-Speed DC Drives. The motor speed could be changed on the fly by increasing the dc voltage setting in the programming parameters using Siemens DriveMonitor on a laptop.
Goats gone!
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Old 09-01-2018, 11:44 AM   #6496
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Goats gone!

??


Sorry, wi-fi crappy at the cg and my phones hotspot is much better for some reason.
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Old 09-01-2018, 01:06 PM   #6497
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saw this at the campground last night Click image for larger version

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Old 09-01-2018, 01:31 PM   #6498
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saw this at the campground last night Attachment 185109Attachment 185110


Micro high rise. Fascinating.
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Old 09-01-2018, 02:31 PM   #6499
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Hope he donít sleep walk!!

Russell
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Old 09-01-2018, 08:39 PM   #6500
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OR...Feed me Seymour!

[QUOTE Or Invasion of the Body Snatchers, which has been remade a few times.

Or...Little shop of Horrors?
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