WHAT HAPPENS IF WE INCREASE THE WEIGHT THE VERY MOMENT THE GLIDE STARTS? The aircraft was powered by a 200hp (150kW) Lycoming IO-360 Special engine driving a two-bladed propeller. Recommended Engine TBO: 2000 hours. The prototype had an open cockpit for a single pilot, but the design allowed for conversion to a two seat layout. Try this Aviation Glide Calculator. Higher lift requires higher airspeed for same AOA. Older Citabria 7GCBC aircraft produced in the 1960s and 1970s had wood spars that are prone to cracking. Parts listed on this page are from a salvaged 1970 Champion 7ECA Citabria. Instead of best glide SPEED, memorize best glide ATTITUDE. Overall, the aircraft delivers what it promises: fun. 32032 Washington Ave. Burlington, WI United States 53105. The outer shape of the fuselage is created by a combination of wooden formers and longerons, covered with fabric. This should be a indicated airspeed you should try and maintain the second your engine quits or starts sputtering. The trim control, same as that used on earlier Citabrias and Decathlons, is a sliding knob, much like the throttle, that is fast and simple to operate. Throttle - CLOSED when in gliding distance or runway 3. Cruise speed: 126 mph. YOU GET THERE QUICKER. 1970 CITABRIA 7-GCBC $69,500 SALE PENDING Aerobatic western owned and hangared Citabria 7-GCBC, completely recovered/painted and interior completed in 2013. All airplanes are designed to be able to glide to anticipate the worst case when the engine is failure. Higher lift and higher airspeed equals higher drag (induced and parasitic). it only depends on its shape, and mostly on the shape of the wings, e.g. Best angle is listed as 70. Instructor Davis said the aircraft requires a long, flat approach, but that was inhibited somewhat at Warrenton by trees off the approach end. In other words, the Angle of Attack for best glide will not change. This is before CAM8 increase. No one expects an air cooled 160hp with a carb. If the weight is reduced and the IAS held constant, the glide angle will: Aircraft weight, air density (e.g. HERES WHERE MY THINKING MAY GET SCREWED UP. Reduce power but maintain altitude, reduce power some more, maintain altitude. American Champion Citabria 7ECA Technical Specifications Exterior Exterior Height: 7 ft 7 in Wing Span: 33 ft 6 in Length: 22 ft 1 in Interior Cabin Height: 3 ft 11 In Cabin Width: 2 ft 6 In Cabin Length: 8 ft 10 In Occupancy Crew: 1 Passengers: 2 Operating Weights Max T/O Weight: 1750 Lb Empty Weight: 1120 Lb Fuel Capacity: 35 Lb So if he creates a few wings sets (6 or 7) with the same surface and varying only the cord and span starting with low aspect moving onto high aspect and seeing which ones glide furthersomewhere in there he would find the "right" AR. How much does a Citabria cost? Most Citabrias were built with wooden spars. 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.. Maule Air Texas Inc. OR USA (214) 384-1858 . I'll bet there are some out there. In addition, metal ribs were nailed to spars, but the nails would pull out. American Champion President Jerry Mehlhaff is banking on the Explorer being much more than a fun machine, of course. Introduced in 1965, the Champion 7GCAA, like the 7ECA, featured wood-spar wings and oleo-shock main gear. 15:1 from 2000 feet gives a distance of 30000 feet or about 6 miles. Since its reintroduction, the Super Decathlon has sold steadily. Category: Airframe > Airframe-General Removed from a 1969 Champion 7ECA Citabria. Yes, L/D is L/D always. Propelle: Sensenich 74DM6S8-1. Since lift must equal weight in a steady descent, weight supported by drag assumed negligible, the aircrafts weight will determine the lift necessary. I'd bet that the glide ratio of a twin with both engines out and neither prop feathered would be genuinely awful. Why should I think its not on the exact same glidepath now? The added weight requires more lift. lighter. American Champion Vice President for Engineering Jerry Mehlhaff, Jr., son of the president, admitted the ailerons in the original design have a "high hinge moment." 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. The real-world measurements I've done with our 182 resulted in a 7.04:1 glide ratio. And this glide path IS the best L/D and longest distance in the glide if that is what you are interested in; distance. The new Ceconite-covered 7GCBC has a 160-hp engine, flaps (as did the original aircraft), and longer wings with metal spars. Citabria 7ECA. When introduced, it featured wood-spar wings and oleo-shock main gear. The extra weight is balanced by the extra lift Ours was built in 1984 and purchased from the Wings of Eagles Museum. flyingcheesehead, Dec 21, 2011. This is a question I was asked a few days ago, and I cant find the correct answer. Flaps-LOWER AS NEEDED in increase approach descent angle (7GCBC) NOTE Slipping the aircraft by cross controlling the rudder and ailerons will increase the rate of descent both with or without flaps. To emphasize a glider term, sink rate matters. So based on the information above. This glider was rebuilt by Chuck Zabinski and Jake Smith. Revision 67. In comparison, a Boeing 747 has a 15:1 glide ratio. [2] He took off from an airstrip at William Barron Hilton's Flying-M Ranch, about 70 miles (110km) southeast of Reno, Nevada. Ours had all spraying equipment removed. AOPA Members DO more LEARN more SAVE more - Get MORE out of being a pilot -, 2023 Aircraft Owners and Pilots Association, Avg. [3], James May, a presenter on The Grand Tour owned an 8KCAB Decathlon with the registration G-OCOK, in reference to his catch-phrase on the television series Top Gear. Center of cabin to wing tip 16.75 feet. I can fly 40% over gross weight and go just as far as the lightest of the same design! Description: Our Club purchased this glider simulator in 2019 for our students from Russell Holtz. But do not ever get an Aeronca or a J3 near a scale - they gain a hundred pounds just like that. THE GLIDE TIME IS SHORTENED. This just doesnt seem to jive. Really ? American Champion expects to begin building the 7GCAA in a year, but with a 160-hp engine. Intended as a lower-priced competitor to the Piper Super Cub, Mehlhaff sees it as a utility aircraft, whether it be on floats or skis, and as a glider tug aircraft. The angle of attack must be increased with each power reduction to maintain altitude. At a constant best glide IAS (CAS), the ground speed will be higher at altitude, but the glide ratio will be the same, as it will be offset by a higher descent rate in equal proportion. by the manufacturer or FAA. ? LETS TRY TO DETERMINE HOW THE FORCES WILL AFFECT THE PLANES PERFORMANCE. Cleveland - 062-00300 - Piston. That was quite helpful, i actually thought the reverse was true but thanks to your explanation things make sense now. I seem to recall something in the 421 manual saying that the no engine glide speed was well north of 120 mph. Its production as a replacement for the Traveler began in August of the same year. 1973 & On, Bellanca Champion Citabria 7ECA, 7GCAA, 7GCBC & 7KCAB Service Manual Original . A 5 deg angle (glide path) gets you 1909 feet farther while Description: The Centrair Pegasus 101 is a single-seat, Standard Class, retractable wheel, competition sailplane, developed in France using a fuselage based on the ASW-19 with the wing profile sections being an improved new design. It was substantially similar to the 7GCAA of the same year, with wood-spar wings and spring steel main gear legs. 2. The Citabria designs passed through the hands of a number of companies through the 1980s, including a Champion Aircraft Company which was no relation to the Champion Aircraft of the 1960s. BUT ONLY IF THE PLANE WAS DESIGNED WITH WINGS TO SUPPORT SUCH A LOAD. Heres one from aerodynamics test: Sorry, JavaScript must be enabled.Change your browser options, then try again. THAT ANGLE OF ATTACK IS THE CORRECT ANGLE FOR THAT PLANES BEST GLIDE SPEED REGARDLESS OF THE PLANES WEIGHT BECAUSE WEIGHT IS NOT A FACTOR IN GLIDING BECAUSE THE AIRPLANE IS PERFECTLY BOUYANT. King - 066-1034-01 - KT-76 ATC TRANSPONDER (14 Volts ) Cleveland - 081-00200 - SEAT - Bleeder. All you have to know beforehand is your glide ratio (say 8:1) and your indicated airspeed. N20737, Glider: HoltzMach 0.1 SimulatorTail #: Vref, the AOPA partner offering aircraft value estimates, suggests a base price for the Citabria 7GCBC of $28,000 for a 1970 model; $38,000 for a 1980 model; $48,000 for a 1994 model; and $63,000 for a 2000 model. Isnt this almost exactly the same question answered by figure 3-18 in the airplane flying handbook. What, if any, specialty instruments are used for professional glide ratio testing (such as a manufacturer developing a new model)? Length: 22 9. Im yet to see a gyro with a better G R than a rock. Daher Kodiak 100 Specifications. PN: 1-2550 Alt_PN: AN6-25. Though the Decathlon went out of production within a decade of its introduction, this was not due to any fault in the design, but rather to the slump in general aviation in the United States at the end of the 1970s and the beginning of the 1980s. The Glide Ratio calculator computes the glide ratio based on the change in forward distance and the change in altitude. To aid in getting down, it is recommended that power be reduced to idle opposite the point of intended touchdown. when the weight increase, the glide ratio remains the same but the speed increases, i.e. The glide flight characteristics of the plane only hold true when operated within design limitations. So tell me (Jim and Paul) what is the AoA for my Citabria or C172 ? During faster maneuvers, such as those required during aerobatics, the ailerons seemed slightly stiff. View photos, ownership, registration history, and more. You know most wings will stall at 18-20 deg of inclination but how do you know the correct angle of attack for the wing on your aircraft for best glide ? For a 14:1 glide ratio we travel 14 nm horizontally for each 1nm we descend. A 1.7 NM per 1000 feet glide is an angle of 5.5 degrees, Arc-Tan (1000/ (1.7*6076)) = 5.5 degrees. What gives? N234WE, Tow: American ChampionCitabria 7GCAA Sn#:2Tail #: And since some Citabrias are indeed old airplanes, there are a few things to watch for when looking for one to bring home, most notably the wooden wing spars found in pre . SECOND THE SPEED VARIABLE: I know the AOA did not change. The model 7ECA Citabria entered production at Champion in 1964. Champion 7ECA Citabria - BUSHING. Discussion in 'Flight Following' started by Diana, Mar 10, 2005. The flaps offer an impressive six positions, as did the flaps in the original 7GCBC, but all positions add more lift than drag, Mehlhaff, Jr., said, making them ineffective in controlling the descent during a landing. You can see the image damage at the end of the video. 2023 Ask a Flight Instructor All right reserved. Which airplane will arrive first to the ground? Will both airplanes arrive at the same point? Airplanes fly on excess power, not grace, not engineering. Production was completed in 1981. Slow flight was performed at 35 to 40 knots with flaps down. $145.00/hr. An airfoil glides at a maximum lift over drag coefficient, which occurs at a precise Angle of Attack. Especially when the angle is so slight. Empty Weight: 1200 lbs. Views: 838 Inside the box the EPS foam insert holds everything safely in place. Thanks Jim. 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. tan(glide angle)=alt/distance. The heavier airplane will arrive on the ground first, Yes, the airplanes will arrive at the same point (given the correct speed is flown). The extra power afforded by the larger Lycoming shows up mostly in greater climb rates, rather than flat-out cruising speed. hotrod180 offline. For a 172, there is a significant difference between powered L/D vs gliding L/D due to the additional drag of a non-powered rotating propeller. lots of first timers I've taken flying have been amazed at the low HP of airplanes. A&P Audio w/2 place intercom Narco MK12D Nav/Com VOR w/Glide Slope AI DG Narco Transponder Loran Fire Extinguisher Max weight: 1650 Useful Load:464 Empty . Location: San Jose, CA (KRHV) We love helping people achieve their dreams, and flying a taildragger around San Jose with an empty back seat tops our list of very cool things to do. air . RV General Discussion/News The flight manual, by the way, is printed on four sheets of paper and stapled together. IF IM WRONG SOMEBODY OUT THERE PLEASE SET ME STRAIGHT. 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. How to stop ignition interference on radio. The only effect weight has is to vary the time the aircraft will glide for. The landing gear of the Citabria is in a conventional arrangement. We purchased it from Doug Cline in 2019. The last two positions, 27 degrees and 35 degrees, are a tough pull. Wow! Aircraft.com is the leading registry for planes, jets, and helicopters. The wood winged 7GCBC weight go up to 1800lbs on edo 2000 floats. (You must log in or sign up to reply here. PERFORMANCE Acrobatic Limit Loading: +5, -2g's Takeoff Distance, Ground Roll: 430 ft. Takeoff Distance Over 50-ft Obstacle: 895 ft. when I had my mac attack that is what I did and it seem to work.as far as glide slope, look past your feet and that is where you are going to land, it should be about 45 degree. Hummmso short time for the heavier airplane means faster airspeed, faster mean lower angle of attack compare with the slow airplane So how come diferent angles of attack draw the same hipotenusa, if you see this in a form of triangle depicted.? Description: The ASK 21 is constructed of Fibreglas two-seat mid-wing glider aircraft with a T-tail. I do engine off landing all the time.. The outer shape of the fuselage is created by a combination of wooden formers and longerons, covered with fabric. Thats why planes have gross weight limits. The airplane is powered by a horizontally opposed, four cylinder, direct drive, normally aspirated, air cooled, carburetor equipped engine. Description: The PA-25 Pawnee was an agricultural aircraft produced by Piper Aircraft between 1959 and 1981. The wing, downsized from a Champion Scout, was made more rigid intentionally to improve lift and roll rate. The first Citabria came off the line in 1964 at Champion Aircraft in Oseola, Wisconsin, a company that was later bought by Bellanca. And in fact I would challenge that concept of choosing an attitude or angle of attack. 40 or more to one for single seaters has been common for 30 years or so. On the aircraft I fly, the 744, at high gross weights, the ratio approaches almost 4:1, the aircraft doesn't want to come down at all. Views: 645 These three foam inserts lock the transmitter and plane firmly in place for transportation. An aircraft is gliding in still air at an IAS to give the angle of attack for best L/D ratio. Increased wing rigidity is to blame for the float, Mehlhaff, Jr., said. Balanced by the larger Lycoming shows up mostly in greater climb rates, than! 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