Zenith 701 specs cockpit. Performance & Specifications.

Zenith 701 specs cockpit Maybe it will help give you inspiration for your own build. I decided to put together a table which gives a fair comparison between Zenith 's and ICP 's high-wing, STOL, two-seater planes. The CH 701 was first introduced in 1986. Follow us on . Both landings were under 500' Can't really compare because I didn't have both to a complete stop, nor was I trying. Explore exceptional design and performance in aviation. The only two other aircraft that I can think of that possibly could take off shorter would be a helicopter or Wayne Handley’s Turbo Raven. With over 800 Viking engines in Zenith aircraft, this is not our first Just curious if anyone is using the Simwork Studios CH 701 on MSFS 2020. This The Zenith STOL CH 701 made us all proud in 2021! Watch and listen as Zenith Aircraft's Roger Dubbert explains why the CH 701 grabbed so many headlines this year, as he takes you flying in his own personal STOL CH STOL CH 701: Designed for superior forward visibility. Patricia with the STOL CH 701 on the cover of "99 News," the official magazine of the International Organization of Women Pilots (Oct. The STOL CH 701 airframe kit comes with all kit parts to build the airframe: Now in its Sixth Edition, the kit includes the factory riveted wing spars, pre-formed sheet-metal parts (ribs, The Zenith STOL CH 701 and CH 750 are a family of light, two-place kit-built STOL aircraft designed by Canadian aeronautical engineer Chris Heintz through his Midland, Ontario, based View and Download Zenair STOL CH 701 flight manual online. Many builders thus choose to buy ‘component kits,’ purchasing kit sections as they . Pre-cut panel, Dynon and Garmin Take off for the 701 was ~250'. 1348 TT Airframe and Engine. All performance figures are based on standard day, standard atmosphere, sea level, gross weight conditions unless otherwise noted. Total hours flown in the past 6 months. Placing VGs on the 701; Zenith 750; Zenith 750 Cruzer; Zenith 801; Slats v/s VGs; Flying Adventures. com are recommended time-savers to existing builders, and are an excellent resource to those For those of you not familiar with it, the 701 is one of the aircraft created by prolific designer Chris Heintz. This 2006 Zenith CH 701 is for sale for $33,500. Beaufort, Missouri, United States. Find tail numbers, view photos, and get detailed individual aircraft information. 5 %âãÏÓ 77 0 obj > endobj xref 77 46 0000000016 00000 n 0000001996 00000 n 0000002131 00000 n 0000002612 00000 n 0000001240 00000 n 0000002653 00000 n 0000002809 00000 n 0000002964 00000 n 0000003366 00000 n 0000003425 00000 n 0000003501 00000 n 0000004109 00000 n 0000004485 00000 n 0000004720 00000 n Thank you for your goodwill and confidence in Zenith Aircraft Company. Zenith Aircraft Company Mexico Memorial Airport, PO Box Discover the Stol CH750-SD from Zenith Aircraft Company. Zenith Aircraft Company has been established to service the needs of sport pilots as a Supply House for recreational aircraft hobbyists, making available aircraft designs The CH 750 Cruzer does not sacrifice docile handling for speed, however. 00 Add to cart; STOL CH 701 Finishing Kit $ 7,450. Kit Info. Powered by the 100 hp Rotax 912ULS driving a three-blade Warp Drive prop, the airplane performs as advertised and is a blast to fly. Discover Stol CH701 Specifications with Zenith Aircraft Company. 2024 • Display Specs Page • Display Inventory Page • Show all Ads posted by this Advertiser • Recommend This Ad to a Friend • Email ZENITH 701 KIT C85-12F • $27,500 • PROJECT FOR SALE • Zenith 701 with C85 Thank you for your goodwill and confidence in Zenith Aircraft Company. The following performance and specification figures are based on the production prototype STOL CH 801 equipped with the Lycoming O-360-A engine (180 BHP: 400 lbs. Delve into the detailed specifications of this remarkable aircraft. , hereafter also called the Company, or Seller, unless accompanied by a payment of not less than 50-percent of the list price of all parts / kit ordered, and unless accompanied with this signed Conditions of Sale and Warning Notice. The modular construction of the kit means that required workshop space is minimal – most builders SPECIFICATIONS: STOL CH 750 (Based on factory prototype, equipped with 100-hp Continental O-200 powerplant) Zenith Aircraft Company does not manufacture or directly support engines. ZENITH AIRCRAFT CO. with accessories and fixed-pitch Sensenich 76 Thank you for your goodwill and confidence in Zenith Aircraft Company. CH 701 is a reliable two seat aircraft designed with pilot and passenger comfort in mind for short stol ch 701 design features: professional, proven design (since 1986) all-metal airframe; full length flaperons (ailerons & flaps) conventional 3-axis controls; steerable nosewheel; rugged all Zenith Aircraft CH701 is an all metal STOL (short take-off and landing) aircraft. But with about 5 years and 200 hours on the aircraft, I was persuaded to replace it. Zenith Aircraft is in the exclusive business of designing, developing and manufacturing kit aircraft. Nov. , hereafter also called the Company, or Seller, unless accompanied by a payment of not less than 50-percent of the Introduction STOL CH 701; Specs and Performance; Photos Gallery; Videos; Reviews; Building The STOL CH 701; The STOL CH701 Design; Purchase The Kit CH701. If so, do you feel it is realistic? Just curious if anyone is using the Simwork Studios CH 701 on MSFS 2020. A Sport Pilot may fly any aircraft that meets the STOL CH 701 Complete Kits. Fly High with the Zenith Aircraft Newsletter. Discover Comfort and Precision. It is a free resource available exclusively to builders and owners, and we Browse Aircraft. ZENITH; CH701; This is the Zenith STOL 701. CH 701 is a reliable two seat aircraft designed with pilot and passenger comfort in mind for short The CH 701 STOL handles more like an ultralight than a production aircraft, with a high degree of built-in drag - flaperons, and leading, edge slats and don't forget - the associated adverse yaw. 00 Clamps for Air Filter (Viking 130) $6. Many builders thus choose to buy ‘component kits,’ purchasing kit sections as they progress through the project. A thick wing, full-length leading-edge slats and trailing edge Junker type flaperons develop a maximum wing lift coefficient of 3. I got 750 fpm at 54mph and could hold this forever. Airframe Total time. Modifications will affect the specifications and performance of the aircraft. In process of small mod. Follow; Follow; Follow; STOL CH 701. With the STOL CH 701, designer Chris Heintz combined the features and advantages of a “real” airplane with the short-field The Zenith STOL CH 701 occupies an almost unique niche in the world of light backcountry homebuilts, with its metal construction, three-decade history and ongoing kit production. Using state-of-the-art fabrication techniques, the skilled staff produces all kit parts Both aircraft feature tricycle landing gear, thus breaking tradition with conventional bush plane design philosophy, but the STOL capabilities of the aircraft leave no doubt that these planes can be as home in the bush as a Super Cub or Husky. Zenith Aircraft at Work and Play around the World Click here for photos and stories . ZENITH CH 701 STOL • $39,000 • SALE PENDING • 2000 Zenith CH 701. Heintz pointed out that there are no plans of discontinuing the smaller STOL CH 701 design, and that the STOL CH 801 is simply a new product being added to his line of successful designs: "While we've seen several four-seat utility kit Introduction STOL CH 701; Specs and Performance; Photos Gallery; Videos; Reviews; Building The STOL CH 701; The STOL CH701 Design; Purchase The Kit CH701. 00 601/650 Seatbelt Set. Drawing & Manuals Photo Galleries : Videos. Built by Max Stewart in Alice Springs with a Rotax 912 engine and a 3 blade wooden prop, its construction is of conventional metal semi monocoque, held together with aeroplane type pop rivets. Search and rescue STOL CH 701 with a Rotax 912 (Wisconsin, USA) The Savannah main wing spar to fuselage attachment is at the top of the spar, while the 701 is at the bottom, so the welded framework over the cockpit is different, and different strengthening on the inboard ends of the spars. Aero is an online community for active builders and pilots of Zenith Aircraft kits (Chris Heintz / Zenair light airplane designs). Zenith Aircraft's STOL CH 701 demonstrator equipped with the Rotax 912. Fuel Sender Upgrade for Zenith Aircraft (Includes Welding) $700. In this table I have compared Zenith's CH-701 and CH-750 and ICP's Savannah VG, You’ve dreamed of owning and building your own aircraft: The new Zenith CH 750 Cruzer Light Sport Utility kit aircraft is the answer to your dreams – offering you outstanding performance, great capabilities, versatility, comfort, and, best of all, the Zenith CH 750 is an affordable all-metal kit aircraft you can build yourself with basic skills and tools. Drawing & Manuals Photo Galleries the STOL CH 701 design utilizes ‘Hoerner’ tips to maximize the wing’s effective lift area and to minimize wing tips The horizontal tail sections are made up of the elevator and the stabilizer. STOL CH750. C/W full lotus floats and wheel skis. The takeoff run seems to run the same lenght but the speed seemed to build faster. Zenith Aircraft Company Mexico Memorial Airport, PO Box 650 Mexico, Missouri, 65265-0650 USA. msg for info. HIGH-LIFT DESIGN. 23 m) CH 701 is a side-by-side two place, strut-braced high wing monoplane with all-metal structure. 85% factory built airframe by Czech Aircraft Works. Introduction STOL CH 701; Specs and Performance; Photos Gallery; Videos; Reviews; Building The STOL CH 701; The STOL CH701 Design; Purchase The Kit Zenith STOL CH 701 - Specifications (CH 701) Specifications (CH 701) Data from Jane's All The World's Aircraft 1993-94 and Zenith Aircraft. Can be amateur or advanced Ultra. $395. Engine 1 hours. No orders are accepted by Zenith Aircraft Co. 1881 Airport Road, Mexico Memorial Airport Mexico, Missouri, 65265 USA. Pushing it hard. All specifications are based on manufacturer’s calculations. The prototype demonstrator aircraft is equipped with the UL350iS 130-hp fuel-injected UL-Power engine and the latest Dynon SkyView glass panel display system. RELATED RESOURCES. 23 m) Height: 8 ft 7 in (2. The high-lift features of the design give the STOL CH 701 its excellent short take-off and landing capability. Close this search box. And it’s a bunch of fun to fly. 00 Fuel Gauge 2" $58. orders@zenithair. PERFORMANCE AND SPECIFICATIONS. The "Above Request Info Zenith Aircraft Co. Dec. Interactive YouTube video with Live chat! Zenith Aircraft Company recommends the Rotax 912 series engines as the standard powerplant for both the ZODIAC CH 601 series and the STOL CH 701. STOL CH 701 Airframe Kit $ 22,950. 00 3 Gallon Header Tank. It is now about Direct Injection or not. VISIBILITY: Unlike other high-wing designs, the STOL CH 701's wings are positioned above the cabin and fuselage to provide pilot and passengers with superior visibility. Specs and Parameters Operation Procedures Annual Condition Inspection We have built over 6 Zenith aircraft, fly them all over the country and know the ins and outs of the aircraft, so much so we did the Zenith Aircraft Superduty prototype! We will help you every step of the engine installation (even if you need us to install it), and even Introduction STOL CH 701; Specs and Performance; Photos Gallery; Videos; Reviews; Building The STOL CH 701; The STOL CH701 Design; Purchase The Kit CH701. aero; Search. Technically it is not an LSA although a Sport Pilot-certificated pilot may fly it under SP/LSA rules. Specifications Empty weight: 580 lbs (263 kg) MTOW: 1100 lbs (499 kg) Stall speed: 26 kts (30 mph) (48 kph) Watch 1 Video about the Zenith Aircraft CH 701. 20 hours. 62 m) Wing area: 122. Share Aircraft Photos; Sell Your Aircraft; Login Dealer Login Register. %PDF-1. Zenith Aircraft CH701 is an all metal STOL (short take-off and landing) aircraft. Warranty/Liability air or liquid cooled, car engine or lookalike aircraft engine with internal car parts, fuel injection or carburetor, etc. ” “Our takeoff roll was absolutely unbelievable. The CH-701 is known for its striking looks and robust design, making it a favorite among pilots and Funny thing – the original bungee on my 701 lasted for years. New amphibious floats offer capability to operate from both land and water: The amphibious floats feature retractable main wheels (pneumatically The STOL CH 750 uses a special airfoil design to achieve very high lift, low stall speeds, and high strength. Priced at $40,000 CAD and located in Baie-Comeau, QC, this aircraft is an ideal summer toy for any aviation enthusiast. Thank you for your goodwill and confidence in Zenith Aircraft Company. com’s catalog of ZENITH CH701. STOL CH 701 in India. , hereafter also called the Company, or Seller, unless accompanied by a payment of not less than 50-percent of the Specs and Parameters Viking Powered Zenith 701 scroll through a few of our customers’ builds and completions. com (573) 581-9000. Flying On Your Own Wings: Thank you for your goodwill and confidence in Zenith Aircraft Company. Crew: 2; Length: 20 ft 11 in (6. So, I ordered one from Zenith, also the bungee replacement tool which helped - only to find the bungee was too big for my plane. CUSTOM and ALTERNATIVE AIRCRAFT ENGINE INSTALLATIONS STOL CH 701 - Page Two of Two - Click here for Page One The Rotax 912 series engine (80 or 100 hp) is the standard recommended powerplant for the STOL CH Join Jon Humberd as he wraps up a 100-hr inspection of his "Super 701" Zenith STOL CH 701 with UL Power engine. ZENITH 701 • $30,000 • FOR SALE • Built 2010. Heintz is a former aerospace engineer who worked on the Concorde and helped design some of the most popular light planes in Europe, including several for Robin in France. Building Info. Elevate your aviation experience with this outstanding aircraft! Builder Resources; Contact Zenith Aircraft; Zenith. production facilities. Zenith Aircraft Company 1881 Airport Road, Mexico Memorial Airport Mexico, Missouri Specs and Parameters Seat Belt Kit 5-Point Harness for Zenith 750/701/801. Based on the popular STOL CH 701 design from Chris Heintz that was first introduced in 1986, the STOL CH 750 design incorporates all of the 701’s amazing short-field capabilities, while maximizing cabin size and load carrying capability allowed under the FAA’s Sport Pilot / Light Sport Aircraft category. Recent rubber replacement, motor mounts, gearbox overhaul, oil analysis. Zenith. STOL CH 701 STOL CH 750 CH 750 Cruzer STOL CH 801. Stay up to date with all the latest kit aircraft news by subscribing to our newsletter! Also available to builders are useful step-by-step video guides, available on DVD, that visually lead you through the construction of your STOL CH 701 kit aircraft:. The STOL CH 701 is truly the aircraft which combines the advantages of a conventional aircraft with those of an advanced Ultralight. Independently produced by an experienced STOL CH 701 builder, these videos (and more titles) from HomebuiltHELP. Selling my 701 with a 912 ULS, 97. 30 hours total time. Tel: 573-581-9000 (Mon - Fri, 8-5 Central), Fax: 573-581-0011 Comments or questions? Click Here STOL CH 701 instrument panel (tank in right seat for crop spraying) STOL CH 701 instrument panel (Rotax 912) Modifications will affect the specifications and performance of the aircraft. Cabin Details. $425. 1881 Airport Road, Mexico Airport, Mexico, Missouri 65265-0650 USA TEL: 573-581-9000 FAX: 573-581-0011 SPECIFICATIONS STOL CH 701 The Original CH 750 CRUZER The all new CH 750 CRUZER Introductory Price STOL CH 701 STOL CH 750 The roomier STOL CH 750 CH 750 CRUZER I created an airfoil to simulate the high-lift wing/fixed slat combination, basing it roughly on data presented by Danis and Nguyen (“ Development of a Flight Test Program for a Homebuilt Zenith STOL CH 701 ”), Embark on a visual journey with CH701 videos at Zenith Aircraft Company. It features a high-lift wing with fixed full length slots, flaperons, inverted elevator and a flying rudder. $225. Showing all 4 results. 573-581-9000 (Mon - Fri, 8-5 Central) CH 701 is a side-by-side two place, strut-braced high wing monoplane with all-metal mind for short-field capability, excellent performance and good visibility. The floats are mounted on a monoleaf main spring for retained shock absorption on water. Zenith Aircraft has developed a number of “Options” with which Float operation FLOATS: ZenairTM all-metal floats are ideal for use on the STOL CH 701, and may easily be rigged to the aircraft. Performance & Specifications. Zenith The CH 701 easily fits Light-Sport Aircraft definitions, though when built as an amateur-built (51%) kit, it retains that airworthiness. Pre-cut panel, Dynon and Garmin avionics, and more. For the latest additions to the galleries, select the Libraries at the top of the menu list on the left. Stay up to date with all the latest kit Modular Construction: Throughout, construction of the STOL CH 701 kit aircraft is ‘modular’ – each section of the aircraft is built separately on the workbench. If anything its more sleek aspect handles a little more similarly to the trainers most pilots are used to than do the Zenith STOL designs, the relatively high-drag features of which sometimes take a little “getting use to” for pilots who For sale is this 1994 Zenith/Zenair CH-701, a rugged and reliable short takeoff and landing (STOL) aircraft with a strong reputation for performance and durability. Airframe & Propulsion. The standard STOL CH 701 kit now includes many CNC pre-cut and pre-drilled skins and components, Zenith Aircraft Company Mexico Memorial Airport, PO Box 650 Mexico, Missouri, 65265-0650 USA. 3 TT. Zenith Aircraft calls the model “Sport Pilot Ready” and that’s an apt description. 00 Add to cart Fly High with the Zenith Aircraft Newsletter. Standard powerplant is Rotax 912, 4-cylinder, 4 Related Topic: All-Metal Aircraft Construction Developed for the amateur builder, the STOL CH 701 draws upon Zenith Aircraft’s vast design and manufacturing experience. 0 sq ft (11. 10, while maintaining a short wing-span of 27 feet. He will have the cowl and inspection covers off. Online community for active Zenith builders, owners and pilots . Zenith Aircraft's Roger Dubbert takes Roland flying in his STOL CH 701 "Sky Jeep" light sport utility kit airplane (powered by a 100-hp Rotax 912ULS engine), to check out the STOL's performance and handling characteristics, as well as cabin space. Owner The Zenith Aircraft prototype STOL CH 750 SD is powered by a 205 hp IO-375 engine from Aero Sport Power. STOL CH 701 aircrafts pdf manual download. Quick Search. Zenith Aircraft acquired the exclusive rights to manufacture and market Zenair kit aircraft designs from designer Chris Heintz. In brief, we flew the combination in 2007, and it does work. The light two-seat STOL CH 701 was designed to provide excellent STOL performance without the need for a lot power: Overpowering an existing aircraft is the easiest way to achieve short take-off performance (with enough power anything will take-off in a short distance!), but Thank you for your goodwill and confidence in Zenith Aircraft Company. The STOL CH 701 meets "ultralight" specifications in many other countries. The stabilizer is an inverted airfoil The STANDARD Zenith CH650 kit aircraft meets the definition of a Light-Sport Aircraft as defined by “Certification of Aircraft and Airmen for the Operation of Light-Sport Aircraft” (7/20/04). STOL CH 750 STOL CH 701 . Rotax 912 ULS 100 hp. Aircraft location. Custom instrument panels are now available directly from Zenith Aircraft Company exclusively for Zenith builders and owners. I was not pushing it. Zenith Homecoming Tee: Zenair Floats. Introduction STOL CH 701; Specs and Performance; Photos Gallery; Videos; Reviews; Building The STOL CH 701; The STOL CH701 Design Find the best new and used aircraft for sale such as business jets, helicopters, Experimental, Warbirds and more. 3 blade Senenich composite prop. 177 hours. “With big tires and lots of lift-enhancing devices, the Zenair CH-701 is a great backwoods aircraft on wheels, floats, or skis as Grant Rappe demonstrates. 33 m2) First introduced in 1986, the STOL CH 701 aircraft was developed as an off-airport, short take-off and landing kit aircraft to fulfill the demanding requirements of both sport pilots and first-time builders. 2011 issue) "This amazing woman is setting a new level for firsts, including the first woman to obtain Ghana’s National Pilots License and the first woman and first black African to obtain the coveted Rotax Aircraft Engines The STOL CH 701 is a single-engine, two-seat, short takeoff and landing (STOL) kit aircraft produced by American firm Zenith Aircraft Company. Like all Chris Heintz designs, the Super Duty is not designed around any particular engine, which gives you the freedom to In all circumstances, follow all safety precautions pertaining to aircraft, especially around the propeller area. Zenith 701 with NEW 4 generation jabiru 2200, Built by multiple aircraft builder. As the STOL CH 701 is an all metal aircraft built from high strength aviation grade aluminium alloys which have good corrosion resistant characteristics, little care to the airframe is required, especially when stored outside. I found the 701 with slats to be fairly demanding when really slowed up (Roger at ZAC says fly 50 mph-kind of like a Cessna150 I thought) and things can unravel fast close The Zenith CH 750 Cruzer was introduced at Sun’n Fun and was flown to the show by Zenith Aircraft Company president Sebastien Heintz (1,000 miles from the factory in Missouri). Modular Construction: Throughout, construction of the STOL CH 701 kit aircraft is ‘modular’ – each section of the aircraft is built separately on the workbench. The new 912 UL S is a 100 HP* version of the certified 81 HP 912 engine, with Your official resource for our full selection of Zenith Aircraft homebuilt kit planes. It has 177 hours on the airframe and the engine has 177 hours on it. Zenith Aircraft Company has been established to service the needs of sport pilots as a Supply House for recreational aircraft hobbyists, making available aircraft designs Specs and Parameters Zenith 750 Cruzer Zenith 750 Super Duty/801 Zenith 650 Zenith 701 Rans Aircraft Gyrocopters Vans Service Bulletins. Builder Resources; Contact Zenith Aircraft; Zenith. • Contact Jim Parent, Owner - located Windsor, ON N8S 1Z2 Canada • Telephone: ----- • Posted January 4, 2025 • Show all Ads posted by this Advertiser • Recommend This Ad to a Friend • Email Advertiser • Save to Watchlist • Report STOL CH 701 Drawings & Manuals (3) STOL CH 701 Complete Kits (4) STOL CH 701 Component Kits (10) STOL CH 701 Options (18) Product categories. Designed for austere conditions, the CH 701 is not only capable of flying in and out of small unimproved airfields in a variety of environments, its all-metal construction allows it to be stored outside in the elements. Elevate Your Flight Experience with Design 701 Cabin from Zenith Aircraft Company. (Return to Aircraft List) Hans set up for a classic STOL landing. 38 m) Wingspan: 27 ft 0 in (8. CH 701 is a side-by-side two place, strut-braced high wing monoplane with all-metal structure. EN. Search. The simple stressed-skin monocoque construction uses single curvature sheet-metal skins riveted to For more information, contact kit manufacturer Zenith Aircraft Company, 1881 Airport Road, Mexico, Missouri 65265; 573-581-9000. Watch, learn, and soar! Introduction STOL CH 701; Specs and Performance; Photos Gallery; Videos; Reviews; Building The STOL CH 701; The STOL CH701 Design; Purchase The Kit CH701. Specifications (CH 701) Data from Jane's All The World's Aircraft 1993-94 and Zenith Aircraft. It retains a slow landing speed and easy flying characteristics. The 701 will takeoff comfortably at 48mph; lots of control. So if you're looking for a really fast First introduced in 1986, the STOL CH 701 aircraft was developed as an “off-airport” short take-off and landing kit aircraft to fulfill the demanding requirements of both sport pilots and first-time builders. General characteristics. 00 Viking Steel Bungee. I attended the Zenith Aircraft builders workshop in 2005 and decided that the CH-701 model was best suited to operate from my grass strip. Sport Utility. Our test aircraft weighed 677 pounds ready to fly (without fuel) and more importantly, was well within the CG envelope for the The aircraft wings are designed for quick and easy attachment and removal from the fuselage. Participants get to actually start assembling kit parts under the direction and guidance of factory professionals, and “graduate” from the workshop upon completing construction of their own aircraft rudder tail section for one of Zenith Aircraft Company’s popular kit aircraft designs, including the high-wing Zenith CH 750 series or the sleek low-wing Zenith CH 650 cruiser. "A tour of the factory demonstrates the work which goes into producing a kit. Take off the the 150 was ~1200'. ft. Home. STOL 701 Drawings & Manuals; STOL CH 701 Complete Kits; STOL CH 701 Component Kits; STOL CH 701 Engines; STOL CH 701 Options; CH 650. 00 Builders, Here is a single location page that has number of links to information specific to the Zenith 701 / William Wynne-Corvair Combination. Slow flight/ Stalls : The 701 with Slats won't stall; it will mush nose high and descend at 1000fpm under control. The independent, privately-owned company was formed in 1992 and is based in leased 20,000+ sq. Both these sections are unique and developed specifically for maximum effectiveness at low speeds and at high angles of attack. ltul ribd rqjq hcfg duuyp hvnt ylmotva oohi ssae xnrj