Be smart

Roman Vojtěch | July 6, 2010 | F3B, Workshop | 0 |

Last year at F3B World’s my friend made picture of Japanese guy using small greaser tank to oil line. I found this idea as very clever and used it in my own way. I found following pros in this way to grease line:

  • ecologic+economic
  • clean (I hate all that sprayed siliconized stuff+staff, silicon everywhere)
  • tiny
  • cheap
  • automatic (before going for parachute, just hang on greaser and that’s all, after comming back deploy greaser)
  • AND IT’S WORKING!

I don’t think few pictures bellow needs some comments. Maybe only one, I use few drops of pure silicon, in commercial spray there is max. about 5% of silicon.

12mm flaps on your start? Are you sure?

Roman Vojtěch | June 4, 2010 | F3B | 0 |

Today with our composite toys we have many tools how to set up proper deflections on all controllable surfaces (flaps, ailerons, elevator, rudder etc.). We play with speed polars at computers with sophisticated simulation software, we cope with secret setups from top pilots etc. We play with millimeters, on elevator perhaps with tenths of millimeters.

I was just curious what’s going on for example with trailing edge of standard F3B model at launch phase. For me it was big surprise to find out that if you setup e.g. 12mm deflection, just after model release from hand you can have there only 50% of expected setup.

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Crowded

Roman Vojtěch | May 20, 2010 | F3B | 0 |

Today I fly my Tanga (Bretamodel.cz) in following configuration:

LOLO5; records altitude, voltage, flap servo (JR/Graupner Nr.6)
SPELO5; records speed (IAS-Prandtl probe), voltage, elevator servo (JR/Graupner Nr.3)
TENZO; records line tension
JETI Duplex R6 Receiver (2,4GHz)

All three devices are time synchronized, some data are seen on-line on my transmitter via JETI Duplex downlink. There isn’t too much space, is it? Very soon I will add GPS logger and 220Volt plug (grin).

F3B Kirchheim Open 2010

Roman Vojtěch | April 28, 2010 | F3B | 0 |

Nice competition accompanied by nice weather and controlled by experienced team lead by H.P.Goelz, M.Seyfang and U.Trautwein. Very pleasant airfield background, incl. water, showers, cakes etc.

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F3X Stopwatches for Android

Roman Vojtěch | April 12, 2010 | F3B | 1 |

Vitaliy Ryumshin started Android F3X (F3B, F3J and F3K) stopwatches project. It’s perhaps partly port of well-known PalmOS stopwatches from Francesco Pantano. Just look at www.f3j.net and support this project at least by comments. You can download app also from Android Market.

F3J/F3B launch physics

Roman Vojtěch | January 25, 2010 | F3B, News | 0 |

At RC Groups there is interesting thread about F3J/F3B launch physics. Join us and help to decode this important part of F3J/F3B flight.

F3B Eurotour 2010 calendar

Roman Vojtěch | November 2, 2009 | F3B, News | 0 |

You can download F3B Eurotour 2010 calendar (PDF).

Corn Kingdom

Roman Vojtěch | September 10, 2009 | F3B | 0 |

F3B Sputendorf competition nearby Berlin is nearly two weeks gone. Anyhow I’d like to present you few pictures and even less than few thoughts.

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Broken wing

Roman Vojtěch | September 7, 2009 | F3B | 4 |

This is Crossfire wing after Michael Rae hit at F3B World Championship in Ivancice. Picture made by Jan Uhlik.

broken man broken wings

Bad Winch Man

Roman Vojtěch | September 2, 2009 | F3B | 0 |

Nice picture by my friend Jan “Carbon” Uhlik from F3B World’s. Hopefully your winches are under rules (grin). Next week I will present here another very interesting and maybe a bit shocking picture from Ivancice, stay tuned.

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