Original poster: "huil888" <huil888@xxxxxxxxxxxx>
Bart -
You definitely don't want to use any type of liquid to add mass or
redistribute mass within the egg. As you noted, the viscous damper
used on engine
crankshafts is there to absorb energy (torsional vibration).
A great example of internal fluid damping is to try to spin a raw egg and
then a hard-boiled egg. The raw egg can't be spun (unless you cheat and
freeze it), while a hard-boiled egg can be easily spun and will "stand-up"
instantly just like a toy top.
Regards,
Scott Hanson
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, October 05, 2006 11:10 AM
Subject: Re: The Egg Works - Well, Almost
Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
Congrats on the power up spinning of the egg! I couldn't make out detail
very good in the video (my pc sucks), but I could certainly see it
spinning. I doubt the hollow egg is the cause of not spinning up
completely. If it is the "weight" of the egg that is the issue, you could
always drill a small hole in the top of the egg and insert a liquid to
weight it on it's bottom end (water or oil would probably be fine). This
would be similar to a fluid damper used on engines for balance. Just a
thought.
Make sure you do a good write up of this experience!!! I plan on building
one (after you figure it all out);-)
Take care,
Bart
Tesla list wrote:
Original poster: "Cameron B. Prince" <cplists@xxxxxxxxxx>
Hey guys,
I was able to power up the egg last night and after figuring out I had one
pair of coils out of phase, I got it working. The egg spins up as you can
see here:
http://www.teslauniverse.com/images/egg_of_columbus/MOV00628.MPG
Notice the egg spins, but never stands all the way upright. I am not
certain
whether this is due to lack of field strength or if it's caused by the
hollow egg's poor center of gravity. I am going to wind another layer of
12AWG on each coil and see if it improves. I'm looking for another egg
too.
Here are some better pictures of the setup:
http://www.teslauniverse.com/images/egg_of_columbus/DSC00624.JPG
http://www.teslauniverse.com/images/egg_of_columbus/DSC00625.JPG
http://www.teslauniverse.com/images/egg_of_columbus/DSC00626.JPG
This is a schematic of Harry Goldman's driver along with a picture of his
system he sent me:
http://www.teslauniverse.com/images/egg_of_columbus/hg_egg_schematic.jpg
http://www.teslauniverse.com/images/egg_of_columbus/hg_driver.jpg
Gary Lau pointed out that the black cylindrical AC caps I had could be
non-continuous duty motor starting capacitors. I confirmed this last night
after running the egg for about 10 minutes and finding them to be rather
hot. It does look like Harry is using these also by the photo. The silver
MOT like AC caps run cold and I'll use those from now on.
Harry was right on with the values in the schematic. I am using actually
16
ohms, because 8 is too low and the resistors I have are 4 ohm. I do notice
that the set of coils the resistor drives runs hotter than the coils
driven
by the capacitors. This makes me wonder if there is still too little
resistance. More experimenting and maybe testing with a scope will
hopefully
help with this.
More later,
Cameron