Fulmen (oz14707)

About this Plan

Fulmen (Sokol S-496-D Fulmen). Free flight power model. Wingspan 1.35 m.

Note this is not a full size plan.

Direct submission to Outerzone.

Quote (google translated from the Czech): "Competition model for ignition engine Atom 1.8cc, the SOKOL 496-D Fulmen.

He earned his name from his fast motor flight from his friends who were watching his flight, when they called him 'lightning' which is Fulmen in Latin, even such can be the sins of youth. I especially like to remember flying with Mirek Pospibil in places that today are built with paneled through a human anthill, to launch and tune our machines on the Atom 1.8cc together, to throw away the models together and lie down next to each other in the grass in silent observation above us In the circles of rising models. We never had a pain in the back of the neck and today we are going for more sixty long years on, I can still feel the intoxicating scent of blooming earth spreading around us. I'm only sorry today that I can't personally participate in flying with historians, but I like to remember the pleasant moments spent among airplanes and large or just models.

The hull model is built of heavy materials, built with a system of two identical side panels from 3x3 slats connected by crossbars into a spacious hull. The engine and chassis are mounted on a bulkhead made of 1.5mm plywood, the pylon has a backbone made of plywood 2 mm on both sides, finished with bent plywood 0.8 mm and finished at the top with a base plate made of 0.8 mm plywood with layers across. 1mm dia wire bent spur.

Steering wheel: is a structural, 2x2 and 2x5 glued joint with a profile of a straight plate, finished with an adjustment plate.

Elevator: with a symmetrical NACA 0008 profile with 0.8 mm veneer ribs taped on both sides with paper. 2x2 inlet, 2x4 main, 2x8 outlet narrowed to 2x4 at the ends. Cork end arches.

The Wing: is divided by steel wires dia 3 and 2, tied to the fuselage with rubber through bamboo pins dia 3 glued to the pylon. NACA 6409 profile, central ribs from 1.5mm crossbar, others from 0.8mm crossbar and lightened. 4x4, main 2x5 on top of each other and drain 3x12 narrowed towards the end to a 3x6, ground into a wedge. The end cap is made of cork and the connection of the ears is reinforced with a coupling made of 2 mm.

Covering: the entire model with Diplom paper, glued with Casein, water quenched and painted 3 times with clear nitro lacquer.

Center of gravity position: 105mm from the nose, wing adjustment angle +4.5°, elevation +1°, Atom 1.8cc engine offset down by 2.5°. Flight adjustment to the right, to the right.

When building a replica of the model, the author used the profile of a straight board glued together from 3x3, 3x5 and 3x8 slats.

Update 29/7/2023: Added (probably better than mine) transcripts in both English and French, thanks to JMP.

Quote: "Hello, Herewith translations of the original article into French and English. I used: https://www.onlineocr.net/ to convert the image to a text file, and https://www.webtran.eu/czech_english_translator/ to translate the text file to English, then also to French. A little editing later the French and English translations were done.
This is quite an attractive model, thank you Tom! Best modelling regards as always,
Jean-Marie Piednoir."

Supplementary file notes

Planfile includes article.
Transcripts (En, Fr).

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