How to protect your orchard from spring frost with the F-Airgo frost protection machine?
F-Airgo blog

F-Airgo V2021, the world's first 100% Hungarian-developed, towed, TLT-powered, vertical air-transfer machine.

How it works:

From the higher temperature air in the inversion layer (4-30m height), 90,000-110,000m3/h of air is transferred by driving an axial fan and then spreaded under the canopy (20-24m radius). This warm air cannot then rise up and mix with the colder air. It cannot rise because there is now a warmer layer above it. The dispersed air is transferred from here in its warmer state and after seconds it is blown away and mixed with the layer under the canopy and can only cool it. So it became heavier. And because it got heavier, it physically can't rise, it can't rise....- its excess heat heats the growing zone.

The air thus spreaded to warm the inflorescence also starts to cool, but after 15 minutes the F-AirGo V2021 passes again, sending warmer air to help. Due to the dispersion overlap, a tree encounters this warmer air every 6-7 minutes. The air exit speed is 90-110km/h. 1m3 air=1kg. We can put 90-110 tonnes per hour of 2-5 °C warmer mass for defence. The moving air layer alone significantly reduces the frost damage, the heat energy transferred from above significantly improves the efficiency.

At flowering, the seedlings freeze under laboratory conditions at -4.9-5.1 °C. Sometimes we have a full crop at these temperatures, but other years we have 80-90% frost damage. Imagine an unfrosted garden sprout after a spring frost: it only cracks in the morning when it warms up! Surely the sudden warm-up after a frosty night is working against us. I note here: the F-AirGo already draws air from the inversion at 7.30am at +0.2°C +3.0 °C degrees, which is then already 3-7 °C cooler: it compensates for the sudden jump in temperature. If we only ran the fans on our existing sprayers during spring frosts, we would already have a +50% chance of producing a crop. It's all about air mixing. If we run an F-AirGo V2021 instead of a sprayer:
  • You can move 40-80% more air,
  • this can be done by vertical transfer from the warmer air of the inversion,
  • rotating and reusing the waste heat from our own tractor exhaust (70 litres of diesel),
  • the dispersed air glides directly above the soil surface and no harmful air currents are applied to the dormant inflorescence,
  • we can use a target machine: whose trajectory, air performance, air temperature and humidity can be analysed in real time and cloud-based (GPRS-WiFi-Bluetooth)
Endre Farago
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