Hello All,
I have been told by Rush W7RM, and others, that if you make this
modification you lose a lot of the braking power of the gear reduction. I
had one prop pitch that was modified like this and luckily Rush gave me
another gear for it so I could convert it back to stock. Once you machine
the teeth off the output gear you can't go back unless you can get another
gear.
73,
Paul
At 01:45 AM 1/15/99 -0800, you wrote:
>
>
>Hi All
>
>Here's something I found in the 1949 June QST that might
>be of some interest to the guys with prop pitch motors.
>The article was "Speeding up prop pitch beam rotors"
>
>Here's a way to speed up the rotation of a prop pitch without
>external speed up gears, V-belts or speeding up the motor
>until it burns out. Here's how it's done--remove:
>
> 1) the bevel gear;
> 2) its thrust bearing plate;
> 3) the upper case of the speed reduction unit housing;
> 4) the large ring gear with the spline on it;
>
>This last item is the first thing you will see upon removing Item
>3.
>
>Grind the teeth off the hardened splined ring gear. (Not off the
>splined portion, but off the inside of the ring!) Next drill and
>tap
>four holes in the gear carrier over which the ring gear was
>placed.
>Line up the holes with the holes that already exist in the face
>of
>ring gear, and bolt the two together. Reassemble the whole thing
>and fill it with oil. You can now turn your beam at 4 or 5 RPM.
>To reduce this to a more-comfortable 2 RPM, it is only necessary
>to reduce the voltage to the motor. Don't worry about the slight
>reduction in power caused by "short circuiting" one of the
>several
>planetary gear sets. It will still have enough steam to "rotate
>the
>house should the beam get stuck."
>
>This original article appeared in "Hints and Kinks" in the
>magazine
>and was written by W2VLL
>
>73
>Tom W7WHY
>
>--
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>
K7PN/5V7PN
paulnyl@teleport.com
http://www.custommetalworks.com
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