From goffmac747@aol.com Fri Nov 09 08:29:05 2007
Subject:Re: Fwd: Decimator web page up with sounds
I don't know if my last post made it to the list.
I sent it a while ago. For some reason it has not shown up yet so I'll just copy paste it here and see what happens..:
you wrote:
-----Original Message-----
From: Ryan Stroup
To: CloneWheel@yahoogroups.com
Sent: Fri, 9 Nov 2007 11:49 pm
Subject: Re: [CWSG] Re: Fwd: Decimator web page up with sounds
goffmac: I'm confused too about what you were saying about the rotors
being out of sync. They're supposed to be out of sync. Even the rotors
on an actual Leslie were out of sync. Because the lower rotor is much
heavier, it's going to have to play catch-up with the horn. Without some
sort of modification to mechanically link the two motors, it would be
impossible to keep the rotors in sync. That would sound nasty anyway.
-----Original Message-----
From: goffmac747@aol.com
To: CloneWheel@yahoogroups.com
Sent: Fri, 9 Nov 2007 10:46 pm
Subject: Re: [CWSG] Fwd: Decimator web page up with sounds
What I meant was, on a
normal leslie the two rotors have this certain sound when they go
through the speeds. That's why I put the word "sync" in quotes because
obviously they are not in sync, meaning precisely moving together.
Obviously they move independently of each other. But using the regular
two motor, cloth belts, an idler pulley, which is spring loaded, on the
top rotor gives the overall sound a more normal leslie sound. To me the
fact that the top rotor is on a rubber "O" ring which for all intents
and purposes is a rubber band that is taut and exhibits way? less
slippage, changes the character of the leslie. It's too
efficient. Looks like wings on a hummingbird in those videos. It moves
faster than normal and it does not wait for the lower rotor to catch up
before it reches top speed
Hence it's not "in sync" as far as a regular leslie sound goes. I feel
the "O" ring misses much of the in between sounds of a leslie taking
off or slowing down. And perhaps the single motor adds to the problem.
The fact that a single motor is turning at a certain speed, it must
over come it's own inertia to change speeds, and must have a little
more torque as a motor in order to compensate for being one motor
whereas the normal two motor does not have to do that. On a normal
leslie you have one motor "off" and slowing down and the other "on" and
kicking in. There is an added character to that mechanical effect of
the two motors interacting with each other. Added slippage if you will.
There is such a thing as spinning too fast too soon and
with that rubber supercharger belt on there, it will just keep spinning
faster. If the charm of the leslie is the take off and descend, it has
lost that with that set up. I changed the spring relay on my 122 for
one of those electronic relays and I did not like it. Because the old
relay was worn out.The reaction time changed on the take off and
actually added an extra few milisecs of delay before the motors turned.
My new B3/122 came with a brake which had that tube relay going to
chorale before it fully braked. Yanked that tube out so that the coast
from fast to off was more graceful.
With an "O" ring single motor setup, it takes off like a dragster
burning nitro with bleached slicks......too abrupt... All the nuances
are gone.
The tone capabilites, portability and roadworthiness of the leslies is
fine. It's the ramp up, ramp down that I feel was over engineered.
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