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Burkut Jet by Jerrold Jorritsma:


  I had been hearing rumors about a jet powered Berkut for some time and was very happy to finally talk to the builder of this amazing project.

Jerrold has given me permission to publish these photos of his T58 powered Berkut. As you can see, the project is at a very advanced stage and should fly later this year.

Jerrold will be providing more information, so check back often.



  The T58 turbojet engine has a dry sump so there needs to be an external oil tank. The oil is drawn from the center of the tank to allow full flow to the engine at all attitudes. There is also an oil temp sensor, a low oil level switch, and a return oil cooler.


  View looking down and to the rear.

The engine external oil reservoir tank can be seen installed to the right side of the engine.


  There are three cylinders on each side. The center pump cylinder is the horizontal one inboard of the electric actuator screw. This cylinder has twice the fluid capacity of the brake cylinders that go from horizontal to almost vertical position when fully open.

The rod end of each airbrake cylinder connect to the speedbrake panel and the cylinder ends connect to a machined yoke and tube that slips over the electric actuator screw.

When the actuator is extended,it brings out both airbrake cylinders at the same time. The pump cylinder (rod end) is connected to the aft end of the screw.

As the actuator pushes out the top and bottom brake cylinders ( the ones you see almost vertical) the piston rod end of the pump cylinder also moves.

In this way, the pump cylinder pushes fluid into both brake cylinders at the same time through the manifold and hoses. When the brakes are open at various positions the fluid can transfer between the top and bottom cylinders.


  The airbrakes self balance to the airflow from the top and bottom of the wing or sudden pitch change from the pilot.

There are flow restrictors in the fittings on both extend and retract circuits of the brake cylinders to limit the fluid flow rate between them so the airbrake balances slowly.