How to Lomcevak

Lomcevak, 8 point roll, avalanche, etc. All demonstrated with a radio controlled Bucker Jungman.

Category:

Sports

Tags:

• Aerobatics
• Radio
• Control
• Jungmann
• Biplane
• Airshow

[MGB1977Red]

There's some debate about what or what is not a Lomcevak (see "How to Lomcevak 2" on this site). Working out the issues with a RC model is great because you can see what you're doing. The Immelman entry with the Jungmann works quite well...I'd like to see a full sized biplane try it! I've done a Lomcevak in a heavy Pitts...but it's rare. The rudder has too much roll in a model Pitts.

[MGB1977Red]

Control throw is around 60 degrees total on high rates. Most flying is on low rates with around 20% exponential. 80% expo on rudder. I make the transmitter control sticks as long as possible which gives more precision. Servos are max travel at high rates so that you're using as much of the gear train and pots. The radio here is only 612, not 1024. Fast digitial servos with 3.4hz 2048 resolution would be a joy. The secret of precision flight is tiny control inputs at the just right time.

[MGB1977Red]

A lomcevak with RC is the same as with full scale...it's just a matter of size. Full down elevator, full left rudder, full left aileron, full power. Entry should be either straight up, off the top of a loop, a climb at 45 degrees, or on the down side of a stall turn. See How to Lomcevak II for full scale Lomcevaks.

[MGB1977Red]

Neil Williams developed the Lomcovak in the 1950s. His system has 5 basic lomcovaks, each with derivatives. There is the "Main" Lomcovak, "Cap", "Positive Conic", and the "Negative Conic". Ladislav Bezak was originally responsible for conceiving the lomcovak. The Zlin Z-526-A Akrobat was particularly adept at the maneuver. Art Scholl performed a very nice Lomcevak with his Super Chipmunk. I had a Futaba Acrostar that would Lomcevak beautifully but would always exit in a flat inverted spin.

[MGB1977Red]

There are some great Lomcevaks on my video "Airshow Greats" and then there is a 'Wing Lomcevak' on "Lakeland WAC 2003" performed by a Velox out of a stall turn. Lomcevaks with models are brief...there's not much mass to keep the tumble tumbling. The point of the Jungmann clip is to show the Lomcevak entry out of a half-loop which works pretty well with models.

[MGB1977Red]

The Goldberg Bucker Jungmann is just about perfect for aerobatics. Knife-edge has no elevator or aileron coupling. Very predictable snap and spin. OS 1.20 fourstroke with 25% nitro. This Jungmann was built from a kit and there is no ARF version.

[mcfly7x7x]

@MGB1977Red

see my lomcevak with seagull edge 540

[mcfly7x7x]

see my Lomcevak wth seagull edge 540

[dutchboy25al]

That was GREAT!

5 STARS!

[winspeeeed]

Many thanks,

Ivan

[winspeeeed]

MGB what degrees are you using on

Elevator, Aileron, Rudder, I use E 8-10d

A6d R 30d? Nice flying

Regards Ivan

[renibabi1]

This guy can fly...

[fyunchclick]

Some 18 years back I watched over a Brazillian Arfield a Embraer Tucano doing a Lomcevak. I was thrilled, the aircraft going upwards, on momentum, turning on its wing axis, and recovering with a dive. I gather they were prohibited to do that again because of metal fatigue... Nice little aircraft, would love to own one...