Especificações
Extra Carf 260 2.6m 35% (Flying Cirkus Scheme)
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102" (2600 mm) |
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89" (2250 mm) |
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24.25 - 27.5 Lbs (11 - 12.5 kg) dry |
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75 - 100 cc |
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7-8 high power digital servos |
How should we improve a very successful design even further ? - Well, we at CARF-Models asked ourselves that question very often – especially when the topic is aerobatics. Our TOC-proven Extra 330S already got many input from Pilots like Jason Shulman, but when he told us about the advantages of the Extra 260, we started listening immediatly. And not only to him. Also Frazer Briggs is known as a big Extra 260 fan and flew his own designed 260 up to the podium at the Tucson Aerobatic Shootout several times.
But why is the 260 so perfect for our kind of IMAC-style flying ? Well, take a closer look at the full size airplane: Wing and stabs are aligned very axial - the secret of every neutral flying plane. They are reasonable streched in wingspan – almost like a modern F3A design. Missing the counterbalances, the elevators perform very well in sequence flying and let the plance track perfectly. Another affinity to pattern planes. And last, but not least, its fuselage side-area is big enough to perform a good knife-edge in every situation, while still keeping a really good aerodynamic shape. Even a 80cc single cylinder like the DA or 3W 85 provides more than enough power for every maneuver. And is so much affordable than a 100cc twin engine ! And of course, our full-composite Extra 260 2.6m is so strong that the higher vibration level of a single won’t hurt the airframe, even after 1000 flights.
Features
So far, so good. Let’s take a closer look at our 260. You know it – when there aren’t exclusive details , realizing new thoughts to make a modelers life easier – than it’s something, but not a CARF.
- It’s always an issue with the canopies: If you’re making them too small, you need the tools of a dentist to fix the simplest things. If you’re making them too big, the plane will be shaky and noisy, especially with the popular 80cc single cylinder engines. Time for a compromise ! That’s exactly what we were thinking while designing the 260 fuselage.
- We listened to our valued customers all the time and we are always trying to improve things. Regarding the landing gear of our 260, we didn’t make experiments, we just made it solid and strong. You have to do a lot to break that. But even if you do so – ordering the spare parts with our new website was never as easy as it is right now. And then, it takes you exactly three bolts to exchange it. Quite simple, isn’t it?
- As always on our 2.6m planes, all the linkage accessories are included in the kit. We’re using high quality phenolic material, which is really hard to get sloppy. You’ll find everything you need in the hardware-bag.
- You have the freedom of choice when it comes to the servos. All popular high-quality digital servos will fit. We suggest JR’s 8611a or a similar Futaba.
- The elevator doesn’t have any counterbalance, so it will a put a little bit more load at the servos at it usually does. That’s why we recommend the use of one highest performance - i.e. JR 8711 - servo for each stab. You should be really careful to avoid flutter and replace your servo gear when it gets sloppy.
- All popular twin cylinder engines in the 100ccm class will fit under the cowling. A good choice will be the DA-100. But also the very popular and very affordable 80ccm class single cylinder engines will be an excellent choice. If you’re running them on a tuned pipe, you won’t have less power than a 100cc twin on canisters – but it’s so much cheaper!
Lets take a closer look at the wings first. Have your ever heard of the "TAVS"-technology, developed by CARF-Models? Well, it stands for "Total Area Vacuum Sandwich" - making the wings so strong and stiff, no wooden or foam-sandwich plane can compete with. A rib and spare structure inside the wing is already prepared for the aluminum spar tube and all the servos. Its made from high quality balsa and plywood, and - where necessary - it is coated with fiberglass or carbon. All hardware to install the aileron servos is included. Youll find accessories for your choice of JR or Futaba servos in the hardware bag.
 
The stabs inner structure is made from fiberglass-coated balsawood to keep it lightweight. You have to glue in some plywood-frames to mount the servos. Again, there are frames for JR or Futaba included.
The fuselage is stiffened with kevlar and carbon fibers where necessary. The engine dome forms one unit with the rest of the fuselage to keep the vibration and noise-level at a minimum. All popular 100cc twin-engines fit under the easy-to-remove cowling, but also the very popular and affordable 80cc single-cylinder engines fit very well. Featuring an all-composite-structure, you dont have to fear any weakness of the structure because of the stronger vibration even after 1000 flights.
If you use a 80cc single-cylinder, a tuned pipe is highly recommended and fits in the fuselage easily.
On all our modern kits, we modified the landing gear mounting. We didnt make experiments, we just made it solid and massive to keep you happy, even if one landing is less than perfect. And if really something happens, the landing gear legs are quite easy to replace. Three screws and thats it - not that bad, isnt it?
 
What is the most important thing, a good IMAC plane has to be: Right, neutral. So whats the secret about that: There is no secret. Simply care about an axial wing and stab position and about the same fuselage side area above and below the wing axis. Thats it. It doesnt take long to recognize, that we did our homework with our Extra 260. Youll need only a very very small amount of coupling during knife edge. A special feature, also the full-scale Extra 260 offers, is the stab without any counterbalances. Well, we dont want to lie, and there are not only advantages. We highly recommend to use 2 highest power digital servos, like i.e. the JR 8711, for each elevator. And please take always a look of parts getting sloppy and if so, replace them.
The good things are: Youll getting an amazingly clear and strong response to your elevator controls. Use it for the crispiest snaps you ever saw or for the insanest freestyle maneuvers. Its you on the controls, we only care about the right material.
While still providing enough fuselage side-area for the craziest knife-edge maneuvers, the Extra 260s shape is quite aerodynamic. Even with a classic 150cc Engine on canisters, you have more than enough power to beat the wind. Youll probably laughing about that tiny little breeze, when your friends are already taking their Yaks apart.
Look at these large, aggressive ailerons ! The Extra 260 is doing amazingly fast rolls. You dont even need ridicously big throws for that, thanks to the well-proven airfoil and the clean surface of a full-composite airframe.
  
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