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Berkut wings, winglets, and canards are now available. Photos coming soon but they don't look much different than Long-EZ wings. These cores are far superior to the original Berkut kit cores for several reasons. Here are some specifics:
These cores come with a lot of the work already completed that had to be done by the builder with the original kit cores.
Like all Eureka cores, they are CNC cut which results in virtually perfect sizing and surface finish for glassing (or applying carbon as the case may be). With the original Berkut kit supplied cores, they came hotwire cut oversize and the builder had to use a large sanding block to sand them down to final size using aluminum templates. There were several reasons for this which were primarily intended to fix problems associated with cores hotwired by hand. This was a very tedious method that makes an enormous mess. It also introduced the opportunity to damage them if you sanded too much in one place or if they weren't supported properly. Using a CNC hotwire eliminates the problems from hotwiring by hand. Eureka cores come ready to go without having to deal with this step at all.
The leading edges are already separated to expose the shear web face. The shear web face is already prepped and ready to apply the shear web to. With the original kit parts, one had to build a hot wire saw in order to complete this step. There is no need to build a hot wire saw at all with Eureka cores.
The aileron channels are already cut in the wings similar to the way they are cut for the Long-EZ or Cozy. With the original Berkut kit parts, these channels had to be cut and shaped by hand by the builder after the wings were already built.
The electrical conduits are already cut in the wings.
What are the differences between Berkut cores and Long-EZ cores?
Berkut ailerons are significantly bigger than the Long-EZ or Cozy. They are 6" longer in span and also wider over their entire length.
The Berkut airfoils on the wings and winglets are still modified Eppler 1230 airfoils and are very close to the Long-EZ but they are not identical. They also have different reference points for waterlines and the washout is slightly different. All new cut files were made to match the metal sanding templates from the Berkut kit.
There are no lower winglets.
The wing trailing edge is straight with no kinks like the Long-EZ had.
The spar cap troughs are deeper than the Long-EZ or Cozy.
The canard is 6" longer in span.
15 years ago, the cores for the Berkut kit cost about $2500 and still required all the work mentioned above. A full set of Eureka Cores are being offered at the introductory price of only $1900. Give me a call or email me if you have any questions.