Fireworks 4.2 carbon lite, September 2008
Test model with 285g flying weight

We have managed to create Fireworks 4.2 in full carbon version with a flying weight of 285g!

The trick of this success is a special CFR-fleece, which we use on the inner side of the shell of the wing and in the stabilizor. As we have now saved weight on the inside of the shell, we can use the stiff 65g carbon fibre on the outside, which provides a resistant surface. The robust rudder and elevator are built with a shell of fleece and balsa. They have a weight of around 14g (weight including spring, CFR-rods etc.). The spring that brings the elevator back inot position is made of 0,8mm steel wire to ensure a fast and exact reserve. The higher force can easily be held by the Dymond D47 servo.

The result of less weight with constant stiffness:

• depending on the strength of the thrower and of the wind better starting heights. We threw our test model on a day with low wind about 4m higher than the comparative model with disser wing. If you are a strong thrower and throw in windy conditions, you will gain even more starting height.
• with 285g FW4.2 is thermalling clearly better than the normal CFR-versions with more than 300g
• CFR-wings have a longer life than GFR-wings
• advantage at midair-collissions

The test model: the 280g aren't lacking anything:

• the fuselage has a ballast box, in which you can put up to 80g without problem. Of course, you can place a logger or a vario there.
• we used 2 great FS60 for the ailerons -> big deflections and exact reserve are possible -> breaks are very effective
• receiver: the big MZK-Sexta
• accumulator: GP-350mA/h
• servoboard enforced with carbon fibre
• fuselage front part enforced with addiontinal CFR-rovings

Now available as series model!