Then a pencil mark is made just above the hole, at a distance representing the wind speed (D) away from the hole. You gotta think outside the box with the E6B. Time equals. (Navigator's Song, 1943), This page was last edited on 30 October 2020, at 21:19. Catch you guys later. The name comes from its original part number for the U.S Army Air Corps in World War II. If you flew 24nm in 9 minutes how fast were you traveling (in knots). Rotate the inner scale so that 10.5 on the outer scale is opposite 7 on the, Locate the Index on the inner scale and read a groundspeed of 90 kt. The back side is used for calculating wind correction only (crab angle and groundspeed). 25 min. Speed, distance, and time are three interrelated elements. If you know the amount of fuel used and the time, you can determine the fuel, EXAMPLE: If an airplane used 15.4 gal. The winds are from 070 at 15kts. Once the wheel is positioned to represent a certain fixed ratio (for example, pounds of fuel per hour), the rest of the wheel can be consulted to utilize that same ratio in a problem (for example, how many pounds of fuel for a 2.5-hour cruise?) For now they will be used as a guide to mark the wind velocity. Rotate the inner scale so the arrow labeled "US GAL" on the inner scale is, Locate 35 imperial gallons on the outer scale. Your Cessna probably gained more than 45.5 feet but didn’t zoom climb to FL450 in 7 minutes. Reference a sectional aeronautical chart to determine magnetic variation at the. Count the units upwards and place a mark on the plastic that corresponds to the wind speed. Corrected (Approximately True) Altitude Then look around the inner ring to find your Indicated Airspeed and read the True Airspeed on the outer ring.For instance if your flying at 8000' MSL and the outside air temp is -1C (standard), with an IAS of 115Kts your True Airspeed is 130Kt TAS.Note: I use IAS when technically you should use Calibrated Air Speed, but they're almost always with 1-2Kts of one another and CAS is buried in the AFM.Note2: If you are in flight and want to save a step, and speed is more important than 100% accuracy you can use a rule of thumb to calculate TAS from IAS. 5.7 gallons makes much more sense, and is the correct answer. Yet again, the E6B comes to the rescue with a great formula. The ruler then is slid so that the pencil mark is aligned with the true airspeed (B) seen through the transparent part of the wheel. The front side is used for everything else. In this example, the ground speed is 141kts. ( Log Out / Well, this right here is your true index. It was developed prior to the VOR, The first, or top, box is the sequence of information required for filing a flight, The middle box contains the special equipment codes used for item 3. on the flight, The bottom box contains a headwind/crosswind component graph, which is used to, The bold lines that converge on zero and are labeled from 0° to 90° represent. EXAMPLE: How far will the airplane fly in 8 min. I hope you guys enjoyed it, hopefully you’ve learned something going into practice questions. Designed by Elegant Themes | Powered by WordPress. Remember that fuel consumption is greater during the climb to altitude, so this average value does not accurately reflect fuel consumption in cruising flight. For example, for 22kts of wind, you would place the mark at “122”. An aluminium version was made by the London Name Plate Mfg. In the air, I rarely if at all have to do calculations (time, fuel burn) that I can't do in my head accurately enough for the purpose of the flight. This will tell you which scale and which pointer you will need to use. Alternative: E6-B Computer Approach to Magnetic Heading Find corrected (approximately true) altitude. Reply The number opposite 70 on the inside scale is the time it will take to reach your destination, which in this example is 35 minutes. 2 – Crab Angle and Groundspeed Adjusted for Wind. In the air, the flight computer can be used to calculate ground speed, estimated fuel burn and updated estimated time of arrival. It most certainly does! That’s what we’re gonna do, we’re just gonna have this right here. While you can do those calculations with an old school "whiz wheel," an electronic flight computer is a much faster and easier way to get the right answer. Like leg time, the pointer and scales you use will be different if you are working with seconds, minutes, or hours. Here is the current NOAA aviation weather . I’ll bring it up so you can see everything here. (Cockpits were illuminated this way at night.). These flight computers are used during flight planning (on the ground before takeoff) to aid in calculating fuel burn, wind correction, time en route, and other items. It only works in whole units for minutes. In addition to being Editor-in-Chief of Air Facts, John is a Vice President at Sporty’s Pilot Shop, responsible for new product development and marketing. Also, many computers have Fahrenheit to Celsius conversion charts and various reference tables. Rotate the inner scale until the numbers on the inner and outer scale match. This part of the calculator consists of a rotatable semi-transparent wheel with a hole in the middle, and a slide on which a grid is printed, that moves up and down underneath the wheel. groundspeed is. First I will define the scales and the pointers, and then I will show you how to put them into action! Because this is a base 60 system, the multiplication pointer wont work for most problems. On the positive side, It means any number on the scale can represent any order of magnitude of that number. Our team has years of diverse aviation experience as flight instructors, airline pilots, corporate pilots, military pilots, maintenance technicians, aircraft inspectors, and more. In this case, because we know we burn 9.8 gallons per hour, we should burn less than that travelling for 35 minutes. This is because the scales on an E6B can be used with small and big numbers, and it takes a little bit of thinking to make sure you are getting the right number. You convert only one true direction to magnetic, not two. Pointers are the input method of the E6B. All you have to do is follow those instructions, it explains everything else for you. TAS is found by correcting calibrated airspeed (CAS) for density altitude. Dalton felt that it was a rushed design, and wanted to create something more accurate, easier to use, and able to handle higher flight speeds. fuel climb descent tas cas wt/arm wt/mom %mac 17 494.9 0.85 i˚c *tas* mach#-hdg/gs p-d/alt wind x/h-wind cld base gs plan tas act tas plan m# act m# dist fln top dscn endur leg time spc range fph *fuel* climb descent tas cas wt/arm wt/mom %mac 03:1 5:00 14 . Locate 35 on the inner scale and directly above read 210 on the outer. Information Side of Sliding Card. Well, our heading is over this direction about 1,2, 3 degrees. Co. Ltd. produced a "Height & True Airspeed Computer Mk. He applied for a patent in 1936 (granted in 1937 as 2,097,116). We’re gonna put the time underneath it, which actually puts us around the 15. In the previous section, before computing the WCA and groundspeed (GS) on the wind side of, The ALTERNATIVE METHOD suggested on your E6-B is to use TC and winds (true) on the wind side. EXAMPLE: How much fuel will be used during a flight of 2 hr. and that. Wind direction was at 070. In this case, 16% to 115, which is 133Kt TAS. EXAMPLE: Between "1:50" and "2:00" the tick mark represents 5 min. The device's original name is E-6B, but is often abbreviated as E6B, or hyphenated as E6-B for commercial purposes. There is a reason why I have an HP 48gx sitting on my work desk, and not a Pickett N600 slide rule. Typically, time is though of in seconds, minutes, and hours rather than percentage of hours (1:20 rather than 1.33 hours). It lines up on the 16.. now, we certainly weren’t going 16 knots or 1.6 knots. Many just called it the "Dalton Dead Reckoning Computer", one of its original markings. 22 × 35 is 770 not 77 or 7700. Conversion of Nautical Miles to Statute Miles and Vice Versa This is important on the ground to make sure we will arrive on time and with enough fuel, but is… Anyways, let’s dive right into it here. It is to emulate some of the capabilities of the popular E6B flight computer. The reality of the E6B is that, although it is simple to operate, it is not an intuitive piece of equipment to learn. Many airspeed indicator (ASI) instruments have a movable ring built into the face of the instrument that is essentially a subset of the flight computer. EXAMPLE: Determine the weight of 8 qt. direct crosswind. You can work in reverse to find ground speed for a known leg time and distance, and distance for a known leg time and ground speed using the following methods: Groundspeed: Align the distance you traveled on Scale A with the time you traveled on either Scale B for minutes or Scale C for hours. We’re looking at about 76 knots, or 75.. it’s somewhere in that ball part as far as our ground speed goes. Vg, Va and Vw are consistent units of speed. Read your answer at the MULTIPLICATION AND DIVISION POINTER. Opposite 150 is 20.5 gallons on the outer scale. The side you will need to start on is the side with a movable semi-clear disk. So next thing we need to place our course under the true index. The thing with the E6B is that you got outside the box. True airspeed is the indicated airspeed adjusted for pressure and temperature, which change with altitude and atmospheric conditions. Fuel Computations One of the first things that a pilot learns to do is to use an E6B, which is an invaluable tool in quickly calculating your time and fuel to a location. on the inner. So, you put the distance on the outer scale, the time — the minutes, on this B scale here, the middle scale. (or 2 U.S. The first step is to rotate the movable disk to the direction the wind is coming from. This Calculator emulates some of the capabilities of the popular E6B flight computer. (or 4, At "76.8" on the outer scale is an arrow labeled "FUEL LB," and at "96" on the outer, Use these arrows in conjunction with the appropriate "IMP GAL" or "US GAL" arrow. The E6-B was developed in the United States by Naval Lt. Philip Dalton in the late 1930s. Read you groundspeed off of the pointer. After the mark is made, the wheel is turned so that the course (A) is now selected at the top of the wheel. on the inner scale or 1:12 on the hour, Use your flight computer to solve these practice problems (answers are located, If you know groundspeed and time, you can determine the distance. at locations that correspond to the constants that are used when going from one unit to another in various calculations. Temperature Conversions The outer scale will represent the climb rate expressed in feet per minute. SCALE C – The inner scale is only used to determine time in hours. 4A Ref. Note that the numbers used in the sample problems such as airspeed that are given. This is equal to the 4 hr. If you know the fuel consumption rate and usable fuel on board the airplane, you can, EXAMPLE: If the fuel consumption rate is 10.3 GPH and there is 48 gallons of usable, Rotate the inner scale so the Index is opposite 10.3, as shown in the. of oil. In this example you will get about 6 degrees. If you fast forward five hours from the time I first read that quote you get this: This small dent was created when I threw my beloved E6B across the room against a wall in frustration. A similar process, as previously discussed, can be used to convert feet to meters, Set the appropriately labeled arrows opposite each other on the outer and inner, Read the values on the scale containing the arrow for the corresponding unit of, Rotate the inner scale so that the arrow labeled "METERS" (located at 43.5) on, Locate 2,300 on the outer scale and directly below read 700 on the inner, To convert minutes to seconds, place the Index opposite the number of minutes on the, Locate the arrow labeled "SECONDS" (located at 36) on the inner scale. See what I mean when I say you have to really think outside of the box?
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