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My lastest purchase is the Nippel 4D which was developed especially for the use with a Variable-Pitch-Prop. The Centre-Prop design with the VPP (or propeller) in the middle of the fuselage protects the VPP in all possible situations. You can even start the model when it's lying up side down, because the prop can always spin without any ground contact.
The front part made of EPP is extremly tough. Because of it's special construcion, the Nippel "bovers" (back-hovers) very stable. It's even possible to fly rolls backwards!
But still the Nippel is precise and easy to handle. It was optimized for the "Aeromusical" at the German Indoor-Flying-Masters, at which a good show and precise figures are both rated.
 | RCUniverse 3D VPP Foamy Bipe |  |
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_lever.jpg){kind=small}
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