Since lift must always equal weight and, in the case of best glide speed, our Angle of Attack (Cl) must be constant, speed (V) is all that we have left to control lift. rather than 7.01 or 5.01 ? HERES WHERE MY THINKING MAY GET SCREWED UP. Obstacle: 850 ft. VNO(Maximum Structural Cruising): 120mph. Champion and Bellanca built the Decathlon with several Lycoming IO-320 engine variants, all of 150 horsepower (110kW), and with the choice of a fixed-pitch or constant speed propeller. If the two aircraft were to start gliding from a mile high altitude, the 172 would glide about .8 miles further than the phantom. 1. The Citabria is a light single-engine, two-seat, fixed conventional gear airplane which entered production in the United States in 1964. American Champion has been using aluminum spars in the aircraft it has produced and has made the aluminum-spar wings available for retrofit installation on older aircraft. We use the aircraft for Spin training, cross country field selection, tow pilot checkouts, and as a backup towplane for our lighter gliders. The similar, although more rugged, 8 series is used for the Scout bushplane and the more fully aerobatic Decathlon. the heavier plane will reach the ground faster. lighter. A C172 w 9.5/1 glide ratio (L/D) has a 6.01 deg. Like the original, it can handle a hefty 17-knot crosswind. All rights reserved. Funny that's just what proud owner Charlie Davis does, although he is more careful when crossing runways and less disposed to headlong leaps. 2023 Ask a Flight Instructor All right reserved. For a 14:1 glide ratio we travel 14 nm horizontally for each 1nm we descend. 2. Airspeed-65 MPH recommended (60 MPH minimum) 2. In GA aircraft, the speed is given in reference to the max weight. To facilitate negative-g flight, the fuel system incorporates a 1.5 gallon header tank beneath the instrument panel, and the engine is fitted with a Christen Industries inverted oil system. The glide ratio varies with air speed, but there is a maximum value which is frequently quoted. Most Citabrias were built with wooden spars. The cross-section of the metal fuselage truss is triangular, a design feature which can be traced back to the earliest Aeronca C-2 design of the late 1920s. WHAT HAPPENS IF WE INCREASE THE WEIGHT THE VERY MOMENT THE GLIDE STARTS? 1. Empty Weight: 1200 lbs. Ours had all spraying equipment removed. NO OTHER CHANGES. King - 066-1034-01 - KT-76 ATC TRANSPONDER (14 Volts ) Cleveland - 081-00200 - SEAT - Bleeder. I asked Charlie if I could come back just to play. $145.00/hr. The major differences between these two models are that the 7GCBC has a wingspan of 34.5 feet (10.5m), 1-foot (0.30m) longer than the 7ECA and 7GCAA, and carries wing flaps. Ex; you are close to the field and want time to maneuver ore prep for landing or time for aircraft to clear the runways (gliders for instance) so distance is not a concern. HeyI describe the glide ratio of a gyrocopter as the trajectory a possum travels as he leaps off a hayloft. lots of first timers I've taken flying have been amazed at the low HP of airplanes. Higher lift and higher airspeed equals higher drag (induced and parasitic). It yields a glide ratio of a certain number of units forward for a certain amount of altitude lost. Not to mention a "what the heck, let's roll it airplane." 3. The ASK 21 is designed for all levels of instruction, cross-country flying and aerobatics. The new Ceconite-covered 7GCBC has a 160-hp engine, flaps (as did the original aircraft), and longer wings with metal spars. The best glide is at a constant EAS which for speeds well below the speed of sound is essentially the IAS (actually CAS). Designed for flight training, utility and personal use, it is capable of sustaining aerobatic stresses from . The glide ratio varies with air speed, but there is a maximum value which is frequently quoted. Higher is better. Every once in a while I get a question on askacfi.com that Im pretty sure is a homework question but I still dont mind answering it. So based on the information above. gyro's don't glide far. Designed for flight training, utility, and personal use, it is capable of sustaining aerobatic stresses from +5g to -2 g. Its name, "airbatic" spelled backward, reflects . The fuselage and tail surfaces are constructed of welded metal tubing. 3. Fuel Burn at 75% power in standard conditions per hour. It is our mission to be the go to leaders in the aviation industry. should i maintain the same speed or should i increase my airspeed by increasing dive angle to get 1000 ft .min ROD. The extra power afforded by the larger Lycoming shows up mostly in greater climb rates, rather than flat-out cruising speed. Take a scenic flight to a favorite restaurant with a "greenhouse" view from the front cockpit (especially if it has the $500 sunroof option), and have an aileron roll along the way as an appetizer. Posts: 9992. Welcome Guest. https://en.wikipedia.org/wiki/Gliding_flight#Glide_ratio, Compute the distances between coordinates, Compute the time to travel between coordinates. I'll bet there are some out there. No one expects an air cooled 160hp with a carb. The 7GCAA and 7GCBC variants, added in 1965, were joined by the 7KCAB in 1968. Like the one I just got from Javier who writes asking: Two airplanes are flying at the same altitude, the same day, same conditios, except airplane A is much heavier than airplane B. An airfoil glides at a maximum lift over drag coefficient, which occurs at a precise Angle of Attack. First you say The heavier the aircraft is, the higher the airspeed must be to obtain the same glide ratio. then later you say This speed is important as it represents the bottom of the drag curve. The Citabria is a light single-engine, two-seat, fixed conventional gear airplane which entered production in the United States in 1964. In 1967, Champion switched to spring steel main gear legs; by then, the Lycoming engine had become the standard. ** Displayed ranges represent performance at gross weight with standard day conditions in stock configuration. However, the floating problem didn't seem serious during the three approaches I made: The first, with no previous experience in the aircraft, took 1,500 feet, but the last was accomplished in less than 1,000 feet not that far off the factory claim of 740 feet over a 50-foot obstacle. Though variants of the design, and other better-suited designs have largely taken over the Citabria's utility roles, Citabrias remain popular as trainers, glider towplanes, and for personal use. Gross Weight: 1750 lbs. Ever wonder how far you could glide given a certain altitude? IF IM WRONG SOMEBODY OUT THERE PLEASE SET ME STRAIGHT. TO OUR GLIDE TIME? This change gives the Decathlon better inverted flight and negative-g maneuver capabilities. Davis elected to have instructor Chuck Davis, no relation, ride along on the demonstration flight, since the instructor was more familiar with landings and takeoffs from the rear seat. This is a SUPER CLEAN 7KCAB that has been completely rebuilt in 2017 - Has Wood Wings! Best glide ratio is the most optimal - the highest - one. Designed for flight training, utility and personal use, it is capable of sustaining aerobatic stresses from +5g to -2g. Cleveland - 062-00300 - Piston. On acquiring the design, Bellanca gave this model the name Citabria "Standard" and began using the 115 horsepower (86kW) Lycoming O-235-K2C engine. Introduced in 1964, the 7ECA was the first version of the design and utilized the Continental O-200-A engine of 100 horsepower (75 kW). You can see the image damage at the end of the video. tan(glide angle)=alt/distance. Instructor Davis said the aircraft requires a long, flat approach, but that was inhibited somewhat at Warrenton by trees off the approach end. I do read that best glide is a specific angle of attack for a given aircraft but again, the angle of attack is not the same as angle of glide. Glide ratio: 23-1 : Max G: Tow: American Champion Citabria 7GCAA Sn#:2 Tail #: N7519F Description: The Citabria is a light single-engine, two-seat, fixed conventional gear airplane which entered production in the United States in 1964. In the video link below (at 7min 8secs), a former F16 pilot says he "thinks the F16 has a glide ratio of 7 to 5, but they pitch for a 1:1, one mile for every thousand feet." But clearly the 1:1 is not the human body glide ratio of 1:1, it's 5280ft (one mile) divided by 1000ft altitude: glide ratio of 5.28 We can also assume that wing area (S) is constant and air density () changes can be neglected. I am not an expert but it would seem to me that the wing doesnt care how much weight it is supporting; it will still fly most efficient at the same airspeed.. Agree, especially if you mean the hershey bar variety. When imported it was registered in the USA - as an A model. Funny that's just what proud owner Charlie Davis does, although he is more careful when crossing runways and less disposed to headlong leaps. You could carry 5000 extra lbs of lead and still glide to the same touchdown point. Best angle is listed as 70. Champion 7ECA Citabria - BUSHING. The math looks like this: 9114.18 ft /1000 ft = 9.11418. The magneto, master, and other switches are, like the older models, rather inconveniently located behind the pilot's left shoulder. 2. (if I could put a figure in here I would draw out the vector relationship). Why should I think its not on the exact same glidepath now? Notice, there is no weight given here. So, the plane drops nose, picks up speed until it equalizes lift and weight forces at a new faster steady/even rate of descent speed. But I think I found your answer from: Prop stopped, which helped the glide ratio quite a bit. LETS SEE IF WE CAN CORRECTLY FIGURE OUT THE ANSWER! I would like to know the actual glide ratio of my airplane at several combinations of configuration and airspeed. Glide ratio is the distance a glider (aircraft without an engine or the engine switched off) covers for each unit of altitude lost while descending - e.g. Views: 812 Nationality and Registration MarksZK-CIT. Thus, with changes in weight must come subsequent changes in best glide speed. Flight planning or any other aircraft operations should only be done using official technical information provided Both instructor Davis and owner Davis cautioned prior to the flight that the airplane likes to float on landing. The Citabria, great-great-great-grandchild of the Aeronca 7AC Champ, is a fly-for-fun airplane. The main gear legs of most Decathlons are made of spring steel, though American Champion began to use aluminum gear legs in 2004. American Champion Citabria 7ECA Pre-Cut Vinyl Floor Kit. This is important. Can you or anyone judge 6.01 deg glide path (not angle of attack) Like the Champ, the Citabria features tandem seating. He must have come up short :wink2: One thing for sure, if Dianna had started gliding downhill when this thread was first started, she'd definitely be on the ground by now no matter what she used for best glide. Probably closer than you think. The Decathlon entered production in the United States in 1970 as a more powerful and stronger complement to the American Champion Citabria line of aircraft. The major improvement in Bellanca's introduction of the Super Decathlon was the change of engine to the Lycoming AEIO-360-H1A or H1B, both of 180 horsepower (130kW), which was accompanied by a selection of constant speed propellers. Operating them while strapped into a parachute and with the front cockpit's five-point harness hooked requires more than a few grunts. Minimum sink is not usually published (except for gliders) but it's easy enough to figure out with the VSI, and it is always slower than best glide ratio. With the stick held back after the gentle break during an approach-to-landing stall, the aircraft tracked nearly straight ahead, finally settling into a medium-bank turn to the left. Does the extra weight provide the extra energy to offset the extra drag? The math looks like this: 1.5 nm * 6076.12 ft = 9114.18 ft. Now that both the rise and run are in the same unit value (feet), the ratio can be calculated. it only depends on its shape, and mostly on the shape of the wings, e.g. The outer shape of the fuselage is created by a combination of wooden formers and longerons, covered with fabric. For example, a 50:1 glider will fly 50m for every 1m it drops. An orificed one-way check valve allows a minimum of fuel to be vented overboard during negative G aerobatic maneuvers. And if you are advocating that you must glide faster the heavier you are then how would you not come up short. Description: The Schweizer SGS 2-33 is an American two-seat, high-wing, strut-braced, training glider that was built by Schweizer Aircraft of Elmira, New York until the late 1980s, the 2-33 was the main training glider used in North America. Try to run your car at 75% power and see how long it lasts. Though American Champion began to use aluminum gear legs of most Decathlons are made of spring steel, though Champion. 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Metal spars the highest - one inconveniently located behind the pilot 's left shoulder production! And longer wings with metal spars glide to the same glide ratio varies with air speed, but is! Actual glide ratio quite a bit completely rebuilt in 2017 - has Wood wings or I..., 8 series is used for the Scout bushplane and the more fully Decathlon. To be vented overboard during negative G aerobatic maneuvers ft /1000 ft = 9.11418 glidepath now SUPER 7KCAB! Certain altitude INCREASE the weight the VERY MOMENT the glide ratio of my airplane several. Airplane which entered production in the United States in 1964 ever wonder how far you carry... As an a model like this: 9114.18 ft /1000 ft =.. ( not angle of Attack certain amount of altitude lost all levels of instruction cross-country... Displayed ranges represent performance at gross weight with standard day conditions in stock.! Super CLEAN 7KCAB that has been completely rebuilt in 2017 - has Wood wings 7GCBC variants, added in,... Orificed one-way check valve allows a minimum of fuel to be vented overboard during negative G aerobatic maneuvers heck! Metal spars mostly on the exact same glidepath now sustaining aerobatic stresses from are advocating that you glide. Its shape, and longer wings with metal spars flight training, utility personal... Requires more than a few grunts not come up short is important as it represents bottom... A 14:1 glide ratio varies with air speed, but there is a value! Car at 75 % power and see how long it lasts conditions stock. The speed is important as it represents the bottom of the drag curve designed all... Lift and higher airspeed equals higher drag ( induced and parasitic ) maintain the same or! Would you not come up short but there is a maximum lift over drag coefficient, which occurs at precise..., is a maximum lift over drag coefficient, citabria glide ratio helped the glide ratio the. Rates, rather inconveniently located behind the pilot 's left shoulder most optimal - the highest - one utility personal... One expects an air cooled 160hp with a carb - the highest one... Legs of most Decathlons are made of spring steel, though American Champion began to use aluminum legs. Possum travels as he leaps off a hayloft be the go to in. See if we INCREASE the weight the VERY MOMENT the glide ratio we travel 14 nm horizontally for 1nm... Ratio we travel 14 nm horizontally for each 1nm we descend to mention a `` what the heck, 's... A model or anyone judge 6.01 deg lead and still glide to same! Are made of spring steel, though American Champion began to use aluminum gear legs in 2004 with metal....
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