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AVA Pro-e Flapped 3.2m

Product Code: AVA-PRO-EF
 (1 review)

Price: $882.62

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Description

The Vladimir's Models AVA Pro-ef is an improved version of the world renowned electric AVA-ef. Probably no rudder-elevator eSoarer has a better reputation and a more illustrious contest record than the AVA, so improving this already superb model is no mean feat. However Vladimir has incorporated these very significant upgrades in the AVA Pro-ef:

- The electric fuselage pod has been totally redesigned to use a beautifully executed canopy hatch rather than a nosecone, allowing the battery to be inserted and connected easily, improving usability on the field. Also the very slim pod has a carefully engineered wing pylon to reduce interference drag.

- The AVA Pro-e wing planform has been optimised to be more elliptical, and the construction of the tip panels improved to utilise a carbon D-box to be stiffer and stronger. The better adherence to the airfoil profile also gives a useful drag reduction.

- The flapped centre panel has been optimised to be lighter and stronger. The flap allows slower landings, improving accuracy and reducing landing stresses.

- The AVA Pro's tailplane has an improved planform and carbon D-box construction, increasing strength and reducing trim drag.

- The new fin has also been changed to use a molded fixed portion, with a lower drag tailboom attachment that incorporates a very clever quick release mechanism, to make the AVA Pro-ef more transportable.

- The tailboom has been strengthened and stiffened.

- The long pod allows large propellers to be fitted, and the rigid structure allows kilowatt class powertrains to be installed giving ultra fast climbs.

- The low wing loading ensures a very low min sink, and the ability to climb away in the weakest of thermals.

On the construction side, Vladimir has taken the build to a new level of completeness, so the AVA Pro-ef can be assembled in only a few hours. New work done by Vladimir to speed AVA Pro -ef final assembly:

- The flaps are ready hinged and all servo connection hardware is provided.

- All pushrods and horns have been fabricated, wires bent, etc.

- Fitting the servos in the fin has been simplified.

The only work required to compete the model is to glue the boom to the pod, attach the V mount and fin quick release clip, and install the powertrain & RC gear.

The AVA Pro-ef is a stable thermal duration eSoaring model suitable for near beginners and competition fliers alike, and the simple rudder, elevator, flap controls make it supremely easy to fly. Its light weight, prodigious strength, and state of the art design result in unequalled performance. Advanced fliers particularly like the wider speed range the flap allows.


History
The AVA Pro-ef is an evolutionary improvement of the AVA-ef, which was itself an electrified version of Dr Mark Drela's revolutionary Bubble Dancer, but with the letterbox spoiler replaced with a flap, as preferred by European fliers. The AVA was an implementation of Drela’s design using the free flight type construction techniques invented in Eastern Europe, and perfected by Vladimir. Like the Simply the Best and Organic ranges the AVA Pro wing has carbon capped ribs and a Kevlar D box. Allied to a substantial Kevlar wrapped carbon spar this results in a very rigid and almost unbreakable structure.

The aerodynamics are outstanding, utilising specially designed airfoils (no doubt in Xfoil, written by Mark Drela himself when he was a student), and a low drag V mounted tail plane, the AVA has a measured sink rate of 0.3m/s (60 ft per minute). The AVA Pro-ef can be built down to 51 oz, however despite the low wing loading the plane can cope with 15mph winds with ease.

Many have asked about the underslung fin. There is no need to worry, in all the years we have been selling the AVA and the AVA Pro not a single person has reported a broken fin or boom.


AVA Pro-ef Specification
Wing span 3.175m 125 in
Wing area 67.9dm2 1052 sq in
Length 1.7m 67 in
Typical flying weight 1440g 51 oz
Wing loading 21.2g/dm2 7.0 oz/sq ft
EDA 13.4 degrees
Aspect ratio 14.8
Wing airfoil AG24/25/26
Tail airfoil HT14-HT15
Fin airfoil HT13-HT12
Spinner diameter 38mm
Centre of Gravity 100-108mm from wing leading edge
Controls Elevator, rudder, flap



AVA Pro-ef Typical Weights
Fuselage 193g 6.8 oz
Wing 628g 22.2 oz
Hoz tail 25g 0.9 oz
Vert tail 39g 1.4 oz
Accessories 20g 0.7 oz
Total structure 905g 31.9 oz



Recommended Servos
Elevator & rudder* Corona DS843MG, Hyperion DS09-AMD, MKS DS6100, KST X08
Flap Corona DS843MG, Hyperion DS09-AMD, MKS DS6100, KST DS113MG, KST DS135, MKS DS6125 Mini

*In order to balance the model without using a heavy motor we highly recommend that the suggested servos are used for the elevator and rudder controls.


Recommended Powertrains
Hacker B40 10L with 4.4:1 box, 15x9 prop, 3S 2Ah LiPo (58A, 2550 fpm)
Hacker B40 10L with 4.4:1 box, 15x8 prop, 3S 2Ah LiPo (53A, 2400 fpm)
Hacker B40 10L with 4.4:1 box, 14x8 prop, 3S 2Ah LiPo (42A, 1950 fpm)
Kontronik Kira 480-34 with 5.2:1 box, 16x8 prop, 3S 2Ah LiPo (62A, 2880 fpm)
Kontronik Kira 480-34 with 5.2:1 box, 15x9 prop, 3S 2Ah LiPo (55A, 2540 fpm)
Kontronik Kira 480-34 with 5.2:1 box, 14x10 prop, 3S 2Ah LiPo (48A, 2100 fpm)
Kontronik Kira 480-31 with 5.2:1 box, 16x10 prop, 3S 2Ah LiPo (58A, 2730 fpm)
Kontronik Kira 480-31 with 5.2:1 box, 15x10 prop, 3S 2Ah LiPo (47A, 2220 fpm)

Reviews 1  


 Review by:

My Dream Machine

I live in the US and had to purchase my AVA Pro-E Flapped 3.2m there. This was my first major assembly. Iím an intermediate recreational pilot with about 5 yrs. experience. I prefer very slow flying and circling in thermals and have never done aerobatics intentionally. I chose this AVA based on my calculated sink rate estimates (see files attached to https://www.rcgroups.com/forums/showthread.php?3094152-AVA-Pro-E-3-2m-with-Flaps-Build-Log). I did not want a 4m plane and preferred to forego ailerons and just go with the ease of flying with just elevator, rudder and flaps. I did not want a winch launched plane even though some are cheaper, lighter and offer better performance. Iíve been flying this dream machine for 6.5 months. If you can handle the cost and assembly issues, and thatís the reason I provided the build log cited above, you will be very happy with its performance.

Main Components: Neu 1107/1.5Y, P29 gearbox; DS 6100 servos, 3 ea.; Jeti Advance 40 Pro SB Brushless ESC, Spektrum AR 6270 T 6 ch Carbon Fuse Telemetry RX, Turnigy 1300MAH 3S 30C LIPO, Spinner 38 mm, hub 6 mm, 0-degree twist; Aeronaut Fold 15x8 Prop

My All Up Weight: 1343 gms = 47.37 oz = 2.77 lbs
Wing Loading = 6.5 oz/ft2 = 20.4 g/dm2, Span Loading = 133 g/m2
Measured Static Thrust: about 3.4 lb @ 75%, about 3.8 @ 100%
Wing Span: 3.175m = 125 inches, Wing Area: 67.9dm2 = 1052 sq. inches, Length: 1.7m = 67 inches

PROs:
1. Very tame in flight, exceptionally stable. I often take my hands off the sticks and just watch it fly itself. Turns very easy with slight touch of the sticks.
2. Resists stalling. I suspect the wings provide high lift at low speed which prevents stalling.
3. Seems to float exceptionally well compared with my Radian Pro, Elf and Easy Star. Ten minutes of flight time before 2nd motor run is routinely obtained.
4. Flaps allow Speed, Cruise and Thermal flight modes.
5. Full flaps can bring landing speed to near zero. Landings are very easy to perform with no danger of stalling.
6. Easily climbs vertically at 75% engine power at launch. I normally launch at an angle of about 45-60 degrees. However, use of a lighter motor might require nose weight to properly balance the plane.
7. Proper CG location was achieved without the need for any additional weight, however, Hyperflight light weight wire (3.7 gm/m) was used for all servos and all pod electronics had to be mounted fully forward.
8. Batteries allowed 1 hr bench test with thirteen 30 sec. motor runs and continuously moving servos with no sign of sagging power.
9. Have used both Turnigy 30C and Zippy 25C 1300 mAH batteries with equally good performance.
10. Wingtips attach with electrical tape and are very easy to attach & remove.
11. With mid-wing, elevator and rudder attached, it easily fits in the back of a CRV or RAV4 with back seats down.

CONs:
1. Took a lot of research and many eCalc (www.ecalc.ch/index.htm) calculations to identify an appropriate motor/prop/esc/battery combination.
2. The countersunk shoulder needed to recess the head of the wing trailing edge mounting screw below the surface of the wing had not been cut and I had to do it by hand.
3. Servos must be located to nearly +/- 0.5 mm to avoid interference with plastic covers provided.
4. The Neu 1107 motor required the addition of 1/8Ē thick plywood epoxied to the front exterior of the motor mount bulkhead and a cone drill was required to cut the 18 mm hole needed for the gear box.
5. Iím handy with tools but this being my first time assembling a high performance sailplane I thought it was tricky and required many more special tools (4-40 tap, 3/8Ē drill, cone drill, micrometer, Vanessa CG Rig, grinding wheels, bubble level) than I expected. See my RCGroups Build Log cited above.


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