Feuerfestival 2019: Experiment Sonnenraclette
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OK-Sitzung in einem alten Bauernhaus. Auf dem Grill liegt eine Scheibe Brot mit Raclettekäse obendrauf. Nach wenigen Minuten ist das Brot fast verbrannt und der Käse noch nicht mal weich geworden.
„Die Hitze muss von oben kommen“ denke ich und überlege mir auf der Heimreise im Zug, wie man das am besten bewerkstelligen könnte. Vielleicht mit Spiegeln? Es gibt ja Solarofen. Aber dort kommt die Hitze letztendlich auch von unten; diese Spiegel reflektieren die Sonne und strahlen dann ein Pfännli von unten an.
Aber ich kann ja trotzdem Spiegel verwenden, und die Sonnenstrahlung einfach verstärken? Vielleicht mit einem Hohlspiegel? Schminkspiegel sind so geformt. Gibt es denn grosse Schminkspiegel?
Oder wir nehmen eine Lupe. Eine grosse Lupe. Wobei Glas zerbrechlich, schwer und in dieser Grösse bestimmt teuer ist.
Nach ein wenig Stöbern stosse ich zuhause auf folgendes Youtube-Video:
Hier hat jemand eine durchsichtige Plastikplane auf 3 Meter Höhe aufgespannt und mit Wasser gefüllt. Es bildet sich eine riesige Linse -- eine Lupe!
Eine durchsichtige Plastikfolie auf einem Holzgerüst und etwas Wasser ist alles, was es braucht? Geil! Das schreit ja förmlich nach einem Projekt fürs Feuerfestival!
„Leute, bringt Brot und Käse, wir schmoren euch Raclette!“ -- bei der Energie müsste das im Nu zubereitet sein und wir können Raclette für alle Festivalteilnehmer machen.
Soweit die Idee.
Sascha unterstützt mich mit seinen handwerklichen Fähigkeiten.
Der Solarracletteofen steht. Es ist alles vorbereitet für den Test am nächsten Tag.
Die Linse bündelt bereits das Licht auf den Pfosten…
Doch oh weh -- das Licht wird zu schwach gebündelt. Der kleinste Brennpunkt hat etwa die Grösse einer Hand. Dort wird es gerade so heiss, dass man die Hand nicht mehr drin halten kann -- nicht heisser. Käse fängt höchstens an zu schwitzen, Holz und Papier sind vom gebündelten Licht gänzlich unbeeindruckt.
Die Linse ist etwas unförmig. Ich experimentiere mit weniger Wasser, und mit viel mehr Wasser -- doch der Brennpunkt wird und wird nicht enger.
Vielleicht muss die Blache extrem gut und regelmässig gespannt sein. Ausserdem kommt im Youtube-Video die Sonne direkt von oben. Das können wir in unseren Breitengraden natürlich nicht haben.
Trotzdem: Auch wenn es nicht so funktioniert hat wie gewünscht -- mir gefällt die Idee.
Weiter: Feuerfestival 2019: Brandnacht
