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Tuesday, January 19, 2021

Another flying session with the MicroMax

Good session today with the MicroMax. The slope is not the most efficient one, and the wind was a bit crossed from the left, but the lift was ok and the scenery just superb !
With around 5m/s of wind, I decided to fly all the time with 90gr of ballasted. The MicroMax carries ballast easily, and demonstrated very good capabilities. What I like is despite his small size of 1.15m wingspan, it really behaves like a bigger plane. It is stable, cruises very well, keeps energy in turn. Without snapflap it can already turn very short. Overall, a very good micro glider, very capable !

I will prepare a short video, but I had a problem filming with my Osmo Pocket which kept the horizon level instead of following my head movement (the cam is on a helmet), probably a setting mistake. As a consequence I missed some sequences of the flight, too bad ...

I stopped before the sunset to walk down the slope and drive home before the curfew at 6pm.

Sunday, January 10, 2021

Micro Max Maiden Flight

I finally maidened my MicroMax, in far to be ideal conditions, almost zero wind, grey sky, at my club slope. Very happy how it went. This tiny plane is flying like a bigger one, very precise, with a wide range of speed. In calm air, it is demonstrative, showing the climbing air pretty well. I had to reduce the camber in thermal position, I have about 1 .5 to 2mm now. CG at 65mm seemed good.

After few flights, I decide to drive to another slope, to try to find mode wind, which I found, but also much lower temperatures and after 5min, I couldn't feel my fingers anymore, event with thin gloves. But I could see the MicroMax is behaving in 2 to 3m/s of wind. 

The plane even empty penetrates the wind well, accelerate easily and has a very good energy retention for its size. I could chain 4 loopings in a row, and also tried the roll and 4 steps roll without any problem. I will probably work a bit on the aileron differential next time. The rudder authority is good despite the V-tail. So overall very good feelings after this maiden afternoon.

Thursday, January 7, 2021

RTGModel Orden Electro Fuselage

RTGmodel is releasing this month an electro fuselage for the Orden. Milan sent me some pictures of it that I'm sharing with you. 

Once again, Milan is bringing some innovation with this smart servo tray, located in the rear boom which is simply inserted by the side. The servos tray is a 4mm epoxy plate, so very strong which, once glued in place is contributing to the stiffness of the fuselage. On the picture we can also notice that the thickness of the carbon fuselage is consequent.

A recess allow to install and tape the servo tray cover.

The pictures is also giving some indication on the motor which is a 28/29mm geared motor (Tenshock Evo 1520 3300Kv on the picture), the battery is a 4s LiPo.

This allows a large choice of power train and ESC to suit pilot needs from the sport flying to the F3G competition.

Saturday, January 2, 2021

MicroMax assembly completed !


The build went well, but I'm not used to have such small space for radio installation !

The only small issue I encountered was the elevator control horn holes which were too large (1mm) for the 0.8mm piano wire. To fix it, I added a second thin plate of carbon (coming from the servo covers) and re-drilled at 0.8mm.

I ended with a empty flying weight of 227gr, with 8gr of balance lead for a CG at 65mm.

For the ballast, I found an aluminium profile of the right dimension, so could mold 2 ballasts: one at 85 grs, the big one at 190grs.

Maiden flight as soon as weather permits as we have bad weather and snow at the moment.

Assembly log photo album is here: https://photos.app.goo.gl/sAKzQPUn57GqXof79

Sunday, December 27, 2020

Fuselage servo tray for the MicroMax

I did few prototypes before to decide for this one. It is using 2 short prisoner nuts from MPJet (3mm). The front one will be glued in the fuselage and reinforced with some fiberglass. The rear on is inserted in the servo tray. The second 3D printed part is glued with cyano in the fuselage. Installing the servo tray will be pretty easy: Just slide and click the rear 3mm screw, then crew the from and read with a screwdriver. Servos will be maintained in the tray with a bit a rapid epoxy.

The STL file can be found here: 


Wednesday, December 23, 2020

MicroMAX, the pocket F3F !

The MicroMAX is a project initiated by Henning Schmidt (Sansibear), designed by Christophe Bourdon, and developed/manufactured by Anton Ovcharenko (OA  Composites). The idea came initially from the 1m DLG strike, but this time is optimized for slope, with the capability to be ballasted to almost double the flying weight.

The kit arrived just 2 days before Christmas in a sturdy wood box, right on time to be at the bottom of the Christmas tree. The kit is superb and so cute with a very nice unusual metallic lunar gray color.

Kit overview photo albumhttps://photos.app.goo.gl/9DCQrGAKuYzcKyEf9

The one piece wing is displaying a very "cartoonish" microMax Logo in neon color. Servo compartments are ready, location for the control horns, and the control rod in piano wire are drilled already. The wing is maintained on the fuselage with 2 metallic crews. The center front of the wing is showing a recess to install the wing servo connector.

Fuselage is very innovative on the rear end. The section of the fuselage is reduced on the last 4cm in width to offer an elevator control rod exit with a direct access and connection to the elevator control horns, which therefore remain external to the fuselage. This is a very simple but very smart solution for a small glider. The piano wire end is simply crooked, and allow to mount or remove easily the V tails for transportation. The screw inserts are already in place to receive the wing. The V tail joiner is just glued outside the fuselage in a slot molded on purpose.

All necessary accessories are delivered in the kit, including the servo extension, the connectors, the piano wire + sleeves for the fuselage, the piano wire for the ailerons, the fuselage servo tray in epoxy board, the servos covers, the carbon control horns.

The finish an fit is absolutely excellent, at the level of what we can expect from a HLG construction. The ballast is not provided, but easy to prepare, as it will take place under the wing and can be immobilized. I think I will prepare a 16mm aluminum tube filled in with lead, and with a nut to fix it firmly with a 3mm screw. According to the designer is should be possible to use a 250gr ballast. I will possibly prepare 50, 100 and 200gr ballast.

The RC equipment consists in 4 micro servos such as the MKS HV75K-N, a tiny 4 channel receiver, and a 1s 420mAh to 600mAh LiPo battery. My idea is to prepare a 3D printed removable servo tray

Below are the components weight:

  •  Fuselage + nose cone : 30.5gr
  •  Wing: 103.25gr
  •  Tails: 5 gr each
  •  V tail joiner: 1.35 gr
  •  total: 145gr


  • Wingspan: 115 cm
  • Wing area: 13,5 dm2
  • Wing loading: 18,0 – 38,0 g/dm2
  • Length: 74 cm
  • Empty flying weight: 240-250gr
  • Ballasted weight: 410-500gr
  • construction: Rohacel/Carbon
  • Fuselage: Carbon IMS
  • Wings: Rohacel/Carbon 40g/dm2 UHM
  • Reseller: https://sansibear.de/product/micromax-arf/

Assembly can start ! Stay tuned !

Flying the microMAX, the video