本帖最后由 happydad 于 2013-6-6 21:02 编辑
1. PA(帕斯卡)压强单位1Mpa=10的6次方Pa1帕斯卡＝1牛顿力1牛顿＝1000克*重力加速度（如在非惯性系内，则公式改为）1牛顿＝1000克*参考系的重力加速度1公斤＝9.8牛顿国际单位制：1牛顿＝1千克×每秒^2（“秒^2”表示秒的二次方）1兆帕(MPa)=145磅/英寸2(psi)=10.2千克/厘米2(kg/cm2)=10巴(bar)=9.8大气压(at m)1磅/英寸2(psi)=0.006895兆帕(MPa)=0.0703千克/厘米2(kg/cm2)=0.0689巴(bar)=0.068大气压(at m)1巴(bar)=0.1兆帕(MPa)=14.503磅/英寸2(psi)=1.0197千克/厘米2(kg/cm2)=0.987大气压(at m)1大气压(at m)=0.101325兆帕(MPa)=14.696磅/英寸2(psi)=1.0333千克/厘米2(kg/cm2)=1.0133巴(bar)
2. FPS-(feet per second)测试子弹动能速度的单位Fps就是 英尺/秒 换算成公制单位就是 1fps＝0.304meter/sec（米/秒）1m/s＝3.28fps（m/s=米/秒）这就是为什么328fps成为一个界定的原因，328fps就相当于100m/s，0.2g BB在100m/s时拥有的动能是1joule（1焦耳）。从基础物理学上得到下列基本方程式：s=ut+1/2at2s＝distance （距离）u＝initial velocity（初速）也写成 Muzzle velocityv＝final velocity （终速）这个速度在方程式里面没有体现a＝acceleration（加速度）t＝time passed（时间）
3. ft/Ibs(英尺/磅力)FT/LBSFT =foot or feet 英尺; lb.是英文pound(磅)的缩写,复数为lbs.1磅写作1lb.5磅写作5lbs. pound(磅)是重量单位.1英尺磅力（ft·lbf）=1.35582焦耳（J）.
4. 常见的铅弹重量单位。7000 grain = 1 pound, 1 grain = 0.000142857143 pounds
Adjustable Objective (AO) - In scopes, the front objective turns to focus the image. Most AO scopes also have yardage ticks to rangefind while focusing.
Airgun Rated (Scopes) - Can mean one of two things: 1)Built strong enough to handle a heavy recoiling spring gun, which recoils both rearward and forward, which is more harmful to scopes that high-power firearms. or 2)Built to focus down to closer ranges than a typical firearm scope, normally about 10 yards as a minimum.
BAR vs PSI (Air Pressure) - Two standards of measurement for pneumatic pressure. 1.0 BAR is equal to 14.5037738 PSI. So, 200 BAR x 14.5037738 is equal to 2900.75 PSI. To convert PSI back to BAR, divide by 14.5037738.
Dieseling - When a spring piston airgun has excessive lube, and this lube ignites due to the heat caused by the rapid increase in air pressure during the piston compression stroke. This process is normal on a new or recently lubricated spring gun. Excessive dieseling can be cause for concern as seals and/or components can be damaged.
Foot Pounds (Ft/Lbs) - A way to measure energy based on the velocity and the weight of the ammunition used. To calculate, use the following equation:
Gas Ram - Similar to a spring gun in function, without the mainspring. A gas ram is a gas strut placed in the compression chamber of the rifle. Behind the piston is compressed air. When the airgun is cocked, the air is further compressed. When the airgun is fired the air expands and pushes the piston forward, compressing the air in front of the piston and thus fires the pellet.
M.O.A. - Acronym for Minute of Angle. Minute of Angle is defined as the distance of a line that is made from point A to point B of an angle of one minute of one degree at a distance of 100 yards. More simply stated, Minute of Angle is movement of 1 inch at 100 yards. A scope with 1/4" MOA will shift 1/4" of movement at 100 yards for every click of the turret. Target scopes have finer adjustments with 1/8" MOA, allowing for 1/8" of movement per click at 100 yards.
Moderator - A device designed to reduce muzzle report on an airgun by moderating the air released when firing.
Parallax - Dictionary says: An apparent change in the direction of an object, caused by a change in observational position that provides a new line of sight. Practical definition: Cross-hair picture moves off target depending on head placement. Focusing the scope properly can eliminate parallax and improve accuracy by eliminating the error in head placement.
Precharged - Any airgun that requires gas to be transfered to an onboard tank to generate its power.
Pneumatic - Any airgun that uses compressed gas as its powerplant. Examples would be Precharged, Single-Stroke, and Pump-up.
Regulator - Device that steps the pressure in the air cylinder down to a lower level to maintain consistent pressure for the airgun to fire from. Often found on match grade rifles to ensure absolute consistency.
Single Stage Trigger - Typical American hunting trigger that breaks upon application of pressure.
Target Turrets - Raised adjuster knobs on a scope that can easily be turned by hand without use of tools.
Two Stage Trigger - Small amount of take up is the first stage, coming to a complete stop. Second stage breaks and releases trigger with any further pressure.
Underlever - Any airgun where the cocking lever is seperate from the barrel and located beneath the barrel. Most run parallel with the barrel, but some are inside the stock.
Velocity - The speed at which the ammunition is being propelled. Normally calculated as Feet-Per-Second (fps).
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发表于 2013-6-4 10:45
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发表于 2013-6-4 14:24
