View Full Version : rytera nemisis

11-07-2010, 05:57 PM
would using a bow turbo on my nemisis void the warrenty?

11-07-2010, 06:39 PM
If it doesn't, it should!

What a piece of snake-oil garbage.

11-07-2010, 07:00 PM
Let me explain what the "Bow Turbo" does, and how it works.

Every cam system uses compounded leverage to provide two primary things.

(1.) Peak draw weight, over a larger portion of the draw cycle.
(2.) A lower holding weight at full draw.

The way the cams do this, is by trading poundage for distance. Like a lever.

In order to understand how any cam system works, you must understand how a lever works and how it applies to a cam.

This is a basic lever.
http://im1.shutterfly.com/media/47b9cc00b3127ccef8bf5c3e2e4000000030O00BaOGzNqyYsg e3nwY/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/

It has four components.

(1.) Fulcrum
(2.) Load
(3.) Effort
(4.) Lever

The longer arm of the lever has a mechanical advantage over the shorter one. It requires less effort to lift more weight, but it has to move farther, at the same time. It trades distance, for force.

It doesn't matter what shape or angle the lever is, as long as the effort to move it, is at a 90 deg angle. Any deviation from 90 deg, results in a fraction of the effort applied, being transfered to the fulcrum as leveraged force.

http://im1.shutterfly.com/media/47b9cc00b3127ccef8be4e930ea800000030O00BaOGzNqyYsg e3nwY/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/

This shows how leverage is applied in a cam. This example shows the most basic form of dual cam, with zero mechanical advantage at any time in the draw cycle. The arrows demonstrate the direction of applied forces, NOT the direction of motion of the components. It also shows the "levers" inside the cam at this specific moment. A cable wrapped around a wheel, can only transfer force to the fulcrum (center of the axle) at a 90 deg angle. A cable can only pull in a straight line. It can't push and it can't apply sideways force.

http://im1.shutterfly.com/media/47b9cc00b3127ccef8be95044eca00000030O00BaOGzNqyYsg e3nwY/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/

This image, shows a basic dual cam system, that will provide let-off at full draw, just not very much. The left image shows the bow and limbs at brace. Notice the cable has the longest lever and the string has the shortest. The right image, shows the bow at full draw. Notice, the string has the advantage and the cable has the "short end of the stick". That means the string is under much less tension than the cables.

http://im1.shutterfly.com/media/47b9cc00b3127ccef8be98178f7700000030O00BaOGzNqyYsg e3nwY/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/

What the "Bow Turbo" does, is retards the cams. That, lengthens the lever arm of the cable, and shortens the lever arm of the string.

The draw length will also be increased. More so, if the bow's cams are stopped by the cable contacting a stop on the cam. Not only does the "Bow Turbo" retard the cams, it also pulls the cables closer to the riser.

Basically, all the "Bow Turbo" does, is increase your draw weight and draw length, in a sneaky way that you might not notice, and it probably reduces your bow's efficiency in the process.

11-08-2010, 06:57 AM
Thanks for posting that Doc! It gives a very clear understanding of the mechanics of the compound bow.