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Hyperion YAK-54 "40e" Super-Scale ARF

The Hyperion YAK-54 40e sets the new benchmark in electric aerobatic models.  Constructed of hand-picked light balsa and ply, the fuselage, wing, and tail group carefully follow the lines of the full-size Russian YAK 54.  The hand painted fiberglass cowl is simply... a work of art: YAK54 louvers are molded in, and the paint and striping are a perfect color match to the model covering.  The prepainted super-clear canopy is already mounted on a wood frame, with a preinstalled canopy latch for retention to the fuselage (sorry, nothing for you to do here either!).  Battery access takes just a few seconds...

In order to please the 3D enthusiasts, Hyperion designers increased the aileron, elevator, and rudder surface area, while staying very near the original outlines of the whole flying surface. Unusual for a model in this size range, the tail group is fully airfoiled;  just another pointer to the dedication of the Hyperion design crew. It's all simply beautiful, and a lot of fun when your club members crowd around to get a look at the YAK...

In terms of size, the YAK-40 "40e" can be related to "Engine 40" class models, but the little "e" means it is 100% electric.  Designed from the "ground up" around the extremely powerful Hyperion Z4020-14 motor, you have to experience the performance yourself to believe it.  At about 200W per pound, "Unlimited Vertical" is just the beginning!

The YAK-54 40e weighs in at 5 pounds maximum (~2.3Kg).  This very light weight coupled with generous wing area and extremely rigid construction lend the YAK-54 an extremely wide performance envelope, from 3D Maneuvers to high-speed, Big Sky Aerobatics.  It will surly become the model that gets taken out every weekend; it's that much fun to fly!  The wings are removable in a matter of a few seconds, for easy transport to the field, and storage at home.

Bigger flies better, and this large model is also very easy to see at a distance.  That sharpens the manuvers of any pilot, and is especially helpful if your eyes aren't "what they used to be".

In the May 2006 issue Fly RC Magazine, they say this about the YAK 54 40e:

"The Hyperion Yak-54 “40e” is exactly what I was looking for. It is a .40-size scale aerobatic model that not only comes in lighter than its glow counterpart, it also offers superior performance. It also comes standard with items usually found only with much larger and costlier airplanes. These include a carbon wing tube, airfoiled tail surfaces, and a perfectly painted fiberglass cowling. The Hyperion Yak has it all – including performance to match!"

We think you'll agree.

Click here for video of the original YAK 54e Production Prototype
(another new video coming about March 15th)

Please see the photo below for specifications.

With this "REALLY-almost-ready-to-fly" just about everything is already completed for you.  Just insert the hinges in the pre-slotted control surfaces and CA glue them, install servos/receiver, motor, controller and battery, screw on the cowl, then mount the propeller.  An experienced builder can be ready to fly in three hours! The kits contain English-text build guide written by native English speakers, and CAD drawings for no-mistakes assembly.

Recommended
Batteries

see comments
below also

HP-LCL4200
4S or 5S

Required/Recommended Gear:

Required Tools:

 HYPERION Z4020 Motors + TITAN 80A OPTO Power Set

Here is some data using Hyperion LCL Series lithium battery packs and APC “E” series propellers.  These results are with a freshly charged battery pack during the first 10 seconds of discharge.  Actual average current would be lower, as battery voltage drops during the flight.  Keep in mind, also, that these are EXTREMELY powerful systems, so full throttle is rarely used, and most of the flight is at half throttle, on average.  TESTS BELOW WERE CONDUCTED AT MORE THAN 3000 FEET ABOVE SEA LEVEL. At sea level, amperage will be higher, so be careful to check motor temperature after first short flights. Peak current of about 55A~65A is ideal.

And here are comments from one expert test pilot:  (AT 3000' ABOVE SEA LEVEL)
”My clear favorite is the 14T on 5S and the 15x8 prop. I prefer the feel of the 15x8 in both precision and 3D.  I really prefer the 15" prop to slow the torque roll rate slightly. The 16" props have a pretty high torque rate, almost too fast to control.  With the 15x8 on Z4020-14 (5S) there is plenty of thrust for 3D, yet with a slower torque roll rate. Also the smaller disc and higher rpm minimizes the yaw during pulls and pushes. It’s a very good setup.  I’m landing at 10 minutes of full aerobatics with about 20% capacity remaining in the pack.”

Based on this expert pilot’s feedback, we recommend the Z4020-14 on 5S, with APC 14x7 E prop for sea level to 2000' above sea level (620M). The APC SPORT series is also a very good option, in the 15x6 size (57A max, fresh charged).  For high alitude locations above 2000' the 15x8 may be preferred, but do check motor temperature after first short flight.

Servo Notes:  The YAK-54 is setup with servo hole size to match “Mini” servos such as Hitec 225BB, with plenty of excess ply to allow standard-size servo mounting as an option.  However, we find that the difference in weight between the Mini servos compared to full-size Waypoint W-1631 is only about 13g ea. Most Mini servos we tried suffered gear failures due to the huge control surfaces and abrupt aerobatics.  The Waypoint are faster than most Mini servos, center well, and have very strong gear trains.  Trimming of the servo trays is required to fit the full size servos.  We recommend the Waypoints for Rudder/Elevator and HS-225 MG (metal gear) for ailerons.