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You may also have notice that produce sold under Celestron, Saxon, Skywatcher and Orion (maybe Meade as well?) look similar that is because they come from the same factory, so really, you are not buying anything special other then a Brand Names.
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The Celestron C80ED has a smaller diameter tube and is fitted with a rack & pinion focuser as apposed to the crayford focuser fitted to the the Saxon ED80, Orion ED80 and Skywatcher ED80Īs for which one is the best scope to buy, my money would be on any of the three models that are equipped with the Crayford focuser (I own the Saxon ED80 and use it for Astrophotography).Ĭelestron itself is now owned by SW Technology Corporation, a Delaware company, an affiliate of Synta Technology Corporation( ( )), therefore most or all of Celestron produce are produced by Synta. The ony difference between the Saxon ED80, Orion ED80 and Skywatcher ED80 is the colour, decals and price. The scope we know as the Saxon ED80, Orion ED80, Skywatcher ED80 and the Celestron C80ED are all manufacture by Synta Technology Corporation (China)
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IPR integration allows you to have RODSTAR-V calculate the target production from pump intake pressure or fluid level. A comparison of the features of the various rod-pump analysis tools is given below.I though I should add to this thread to maybe clear up some misconceptions. With RODSTAR-V, you enter a 'target' production and have the program automatically calculate the pumping speed, plunger size, and the optimum rod string design, pumping unit size and motor size you need to make your production. Several parameters were added to the API method that improve the agreement between the SRP Calculator and commercially available analysis programs. While rod loads may be similar between the two types of pumping units, there is a significant reduction in Class III gearbox torque relative to the Class I geometry. The API method suffers from the fact that it does not account for performance differences between Class I (conventional) and Class III (Mark II) geometries. Input and output variables generally follow those provided for the API publication and commercial analysis programs. It can be used to quickly analyze well performance to determine if a more detailed analysis is necessary. Unico's SRP Calculator satisfies the need for simple well analysis. In many situations, however, this precision is unnecessary, and often it greatly exceeds what can be measured at the well site. They are capable of analysis that correlates to actual field measurements with amazing precision. These PC-based analysis programs generally include an extensive database of pumping units and rod-string components. This publication set the standard for analyzing rod pumps until recently, when personal computer calculation programs, such as Theta Enterprises' Rodstar and others, became available. Their results eventually led to the publication of Recommended Practice for Design Calculations for Sucker Rod Pumping Systems (RP 11L) in 1988 by the American Petroleum Institute (API). In 1954, a group of users and manufacturers undertook a study of sucker-rod pumping systems. The popularity of rod-pump systems has lead to a variety of methods for analyzing their performance. As a result, numerous calculations are required to optimize the effectiveness of these types of systems. Sucker-rod pumping systems involve complex dynamic relationships between production rates and stresses at various points within the unit.
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The SRP Calculator is available on-line free of charge and provides a quick, easy analysis for many systems. Unico has developed a convenient design tool for analyzing sucker-rod pumping (SRP) system performance. New Sucker-Rod Pumping System Design Calculator Provides Free, Convenient Analysis On-Line Watch for these topics in upcoming issues.