Archie's Archery Depot

More Info On Vertical Bow:

When you're out bow hunting, your broadheads are arguably the most important items in your kit. It's therefore essential that you pick a model that suits both your bow and your shooting ability. Make sure it's the right size and weight for the bow you're using, and that it works with the way your bow is tuned and set up. You'll also find that some broadheads are designed for specific types of prey, for example for small game. You should always go for a good quality product; while a superior broadhead won't compensate for poor bowmanship, it will give you an advantage if you're already a reasonably proficient archer.

Whether you buy from your local outdoor equipment store or from an online shop, broadheads are available from several different manufacturers. If you're not sure which brand you want, pick one of the most popular ones. That way you know you'll get a well-made product that flies properly thanks to its consistent head weight and standardized specifications. Hunting broadheads come in a number of different types, which in turn can be broken down into three basic categories. The following guide will help you determine which kind might be best for you:

Fixed blade broadheads: Many traditional archers favor broadheads with fixed blades, which are considered to offer the best wound penetration and cleanest blood trails. Fixed blade models are permanently set in the open position, and most are designed to cut on impact. Taken together, this means there's no power wasted on the action of opening up when fixed blades hit their targets, so they're able to penetrate the hide and produce an open wound even on tough-skinned animals like bears, elks and large deer; hence their enduring popularity with the big game hunting set.

The superior penetrative capabilities of the typical fixed blade broadhead stem from its configuration with a sharp central tip that is surrounded by two to four blades in an "arrowhead" formation. For extra cutting power, many models feature additional blades that protrude from the ferrule attached to the arrow shaft. Since they have no moving parts, fixed blade hunting broadheads tend to be stronger and more reliable than their mechanical equivalents. They're also the most economical option as they can be sharpened and re-used many times. This model can be hard to control when used with a high speed bow, and also tricky to tune, but you can compensate for these shortcomings by precisely aligning the blades with the fletching.

Replaceable blade broadheads: Confusingly, these are sometimes also classified as fixed blade models, to differentiate them from mechanical or expandable broadheads. This relatively recent type of broadhead is now very widely used thanks to the convenience and good flight characteristics it offers. The ferrule attached to the arrow shaft is equipped with a sharp steel tip, as well as vertical grooves to house a number of blades that are then locked into place. This allows you to simply replace the blades whenever they are damaged or dulled. While the latest models fly nicely, they still don't penetrate quite as well as fixed blades, and of course they're more expensive too.

Mechanical broadheads: These are also known as expandable or open on impact broadheads and offer good flight abilities, especially at high speeds. This model features a set of blades that lie folded upwards and recessed into slots in the ferrule until the moment of impact, when they unfold automatically. Some expandables have long blades, which gives a wide cutting area for a speedier, more humane kill and a better blood trail.

Open on impact broadheads won't always open as intended, however, resulting in game that's wounded but gets away. In order to penetrate properly your arrows need to fly fast when using expandable broadheads, to make up for the energy lost upon opening. You'll need to ensure that your kit is set up and tuned correctly, but even then it's not always easy to use a mechanical broadhead successfully. On the upside, you will find that mechanicals fly straight and hit their targets accurately thanks to the blades' being hidden and largely unaffected by wind resistance during flight.

Written by Lisa Santora; guest writer for Poor Fish Outdoors. Poor Fish Outdoors is a company that specializes in helping outdoor enthusiasts find bowhunting equipment such as hunting broadheads, plus quality fishing, camping, and cycling gear for their outdoor pursuits. Lisa Santora is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License. © 2010 Poor Fish Outdoors.

What are Vertical Blinds? - an in Depth Review From Made to Measure Blinds UK

Vertical blinds are manufactured in a variety of colours, patterns, and washable fabrics for use in Kitchens, bathrooms, bedrooms, patio doors or French windows. The blind louvers hang freely from their track mechanism and hence they can be manufactured using fabrics, screens or rigid PVC. Traditional louvers are interconnected by a clip and chain which in turn is connected to the keyhole punch in the vane. Modern vertical blinds have dispensed with these interconnections.

Since the louvers of vertical blinds hang loosely from the track mechanism, they sway and bang against each other and could cause undesirable noise especially in the case of PVC louvers. Fabric louvers are less noisome and would be an excellent choice for bedrooms and boardrooms where noise can be distracting. Additionally, fabric blinds come in a variety of shades and patterns that can be used creatively to enhance the beauty of the room and match with the general décor. If High Quality fabrics are used, the longevity of the blind, the translucency factors and ease of cleaning will be ensured. The way the louver hangs will also be straighter and more graceful.

The louvers of the vertical blind fabric are manufactured by weaving or by stitch bonding. Stitch bonding is a process in which the fibres are compressed and stitched through. The stitch itself is decoratively linear, running the length of the fabric and creates a pattern on the louver. This type of louver is generally favoured by those who do not wish to use liners with their louvers.

These are also cheaper than woven fabric vertical blinds. Woven fabric louvers are manufactured using high end, fast weaving equipment. The initial threads are pressed down while the next thread is inserted with speed and accuracy. This makes for durable fabric that can be decoratively and creatively enhanced in a variety of styles and patterns. These louvers also last much longer and retain their newness for longer periods of time.

Vertical blinds today are made form fabric, vinyl and aluminium. Several other types of fabrics are being used for their flame retardant, light reflective, glare reductive and dim out properties. Anti static finish is used on the fabrics to prevent the fabrics from gathering or attracting dust. A few fabrics are specifically selected as they are water resistant and heat reflective.

The greatest advantage that is derived from vertical blinds is that they do not gather dust. The vertical slat does not allow dust to settle on them. Moreover, they are extremely easy to clean. A light duster will help keep the blinds dust free. Use of dust or enzyme spray on the vertical louvers is also recommended if the louvers have become very dirty. They can also be taken down easily for extensive cleaning. The blinds can also be soaked, scrubbed and rinsed to remove stains using soap and water. Household solutions can also be used to clean the blinds.

Vertical blinds can be mounted inside or outside the window frame. They can be used on awkward windows that are sloped or split. Curved head rails are available for use on bay or bow windows.

The vertical blind louvers can be drawn to the left or right or gathered into the centre of the window to get a clear view of the outside. These options are known as split, stack or draw.

Split option allows the vertical blind to be opened in the centre like a drape with a part of the vertical moving to the right and the other part to the left. The stack option moves the vertical blind to right or left side of the window. The cord controls will have to be selected in accordance with the direction of movement of the vertical blind.

Vertical blinds are available in different price ranges. The style, design, fabric used and the accessories will be determining factors. The accessories can include decorative head rails that are stand alone and do not require to be covered up with matching fabrics. Standard vertical blind sizes are less expensive than the ones that are custom made.

About the Author

At Made To Measure Blinds UK we provide cheap vertical blinds in a variety of colours and designs all at the best UK competitive prices.

Conservation of energy problems?

1. A 250 g arrow is fired at 120 m/s at a 30° angle with the horizontal. How high is it at the top of its arc?

I won't solve the problem for you, but I will tell you how. That is what is most valuable to you. Just giving answers would only cripple you.

1. Convert the arrow's velocity into its vertical and horizontal components. In this case, use sine for the vertical component, cosine for the horizontal. The horizontal component will stay the same, but at the top of its arc, the vertical component will go away. So, find the kinetic energy due to the vertical component (E = 1/2 * m * v^2), and convert that to gravitational potential energy. E = mgh. (mass, gravitational acceleration, height in meters). Don't forget to convert the mass to kilograms.

2. Same story, different direction. Find the vertical height from the pendulum's lowest point (.5 meters * sin 30, here), and convert that gravitational potential energy to an equivalent kinetic energy, and find that velocity. The gravitational potential from the height becomes kinetic energy in the pendulum's swinging motion.

3. The change in height gives how much gravitational potential energy has become kinetic energy. This is 30 meters. Add this energy to the kinetic energy (find that first), and then convert that to a new velocity. Old KE = 1/2 * (.25 kg) * (52 m/s)^2, add gravitational potential = .25 * 30 * 9.8, and then that energy is 1/2 * (.25 kg) * (NEW v)^2. Find the new v.

If anyone else does the math for you, they are doing you a great disservice.

Snow Sports: Rocker has skiing world rolling on the slopes
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