VCS1 wrote:
With all these "kits" having been delivered I am very curious as to what is delaying progress? Are there just small problems that have to be worked out (as in any aircraft being put together)? Or structural and design problems that are forcing rework and redesign? What is the overall quality of the work that was done? Fit and finish of panels, rivet quality ect? I have not had the opportunity to see a Flug Werk airframe up close, I would appreciate any observations from WIX members.
I just had the opportunity to look at one of these aircraft. In my opinion the quality is very good- the workmanship is fantastic.
However, the kits as delivered were not complete. Some of the original German systems don't lend themselves well to reproduction- the annular oil cooler and air outlet scheme, oil tank, cooling fan gearbox and some landing gear system components for instance, and not enough gear actuator/downlock components were provided to allow the aircraft to even sit on the gear. In light of the above oil cooler system issues Flugwerk also did some firewall forward changes from the original design which seem a bit odd (their oil cooler scheme might not work well in the warmer climates). The Russian engine intended for these kits, although apparently quite good, is difficult to support in the west (or at least the US).
To recap, everything Flugwerk did for the airframe they did very well and very close to the blueprints. The systems were incomplete in the kit (the 10% of the project that takes 90% of the time). Some of the changes necessitated by the unavailability of original system components may not work acceptably as designed- I think that kits were delivered prior to an aircraft actually flying, so some of the deficiencies in the systems designed by Flugwerk may not have been known. As an engineer, it is in retrospect sometimes hard to second guess all the design considerations that go into a decision made by another engineer, so I'll just have to wait and see.
Basically the aircraft is part reproduction and part homebuilt. That is likely why there aren't many of these yet airborne. On a scale of one to ten, with one being "just bolt together and fly" and ten being "dataplate provided, build the rest yourself," I give it about a five.