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Sep 19, 2020, 07:59 PM
Lori, hey, you're home early
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Bf-109 G6 Walkaround Videos

Messerschmitt Bf 109 G4 "Nesthäkchen / Weisse 3" | WALKAROUND (4 min 30 sec)

Messerschmitts at Hangar 10 | Walkaround (5 min 25 sec)
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Sep 20, 2020, 09:38 AM
Lori, hey, you're home early
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Notes on bF-109 G "split flap" function

"The flap+radiator arrangement on the Bf 109 was unique, very complex and bears no similarity to anything else.

The coolant radiator had two flaps. The top radiator flap was controlled by a hydraulic piston linked to a thermostat, which moved it depending on the temperature of the coolant. The bottom radiator flap was secured with a pin to the landing flap. So, whatever position the landing flap was, so was the lower radiator flap. The landing flap was controlled by a large wheel on the left side of the pilot seat. The pilot adjusted it by turning that wheel as needed for the landing speed. After landing, if the pilot or ground crew did not bother to turn that wheel, the flap stayed in whatever position.

Here is an explanation:

So, you can set your flaps/radiator flaps whichever way you want while keeping in mind that the lower radiator flaps MUST be at the same angle as the landing flap."

"An oft seen error when positioning flaps on a '109 is the relationship between the split cooler flaps and the mid-span landing flaps. In relation to the landing flaps (which appear to be at the 40 degree full down position), with the cooler flaps full open, the lower flap would be in line with the landing flap and the top flap would be about 10 degrees below the top surface of the wing (in line with the trailing edge of the wing fillet.) With landing flaps full down, in the automatic setting on start-up from cold, the flaps would motor shut, leaving the lower flap stationary whilst the top flap motored closed to leave a gap of about 125mm. Viewed in plan, this would mean that you would see the lower flap protruding beyond the upper. If the pilot were to then raise the flaps prior to taxiing, the cooler flaps would then come to a position where they were symmetrically positioned with the chord of the wing with little more than a 10mm gap at the trailing edge.

On the ground, due to the poor cooling capacity of the small radiators, the flaps would often motor open whilst taxiing (in fact with Black 6 we preferred to allow them to open before taxiing since the reaction time of the automatic system could be so sluggish at times that a couple of blips of the throttle would nudge the temperature up toward the 115degC limit!) With the landing flaps fully raised, the opened cooler flaps would be symmetrically deployed about the midpoint of the wing in cross section (fore & aft) with an angle of approximately 35degrees between them.

This rather lengthy little ditty should help obtain a slightly more realistic looking '109 model. Cheers!"
Last edited by CarreraGTSCS; Sep 20, 2020 at 09:47 AM.

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