Difference between revisions of "Bearhawk N813Z Build Reference"

Revision as of 19:29, 1 November 2017

This wiki is mainly to keep personal build notes. My Bearhawk is a 2007-era quickbuild kit from Avipro. I began my project in January 2014. In order to have the airplane I want, I've decided to do many modifications to the original design, including:

Fuselage mods

Mods status

List of mods/status/opinion/to-do:

• Skylight -- Needs finish welding
• Profiled horizontal stabilizer using wood rib extensions -- Rib extensions arrived from akschu
• non-servoing electric elevator trim using a BristolSG servo -- Mounting brackets design with Hogan and cut
• Gullwing-style seaplane doors
• Float fittings -- Undetermined route
• Additional grab handles on upper longerons forward of horz stabilizer -- Purchased Maule handles
• Straightened the profile of the back stringers to be straight by adjusting saddle heights
• Tail beef-up with vertical members -- On the fence
• Tail belly pan with stringer termination crossbar -- To do
• Extended baggage -- Now known as the "Schubag" mod -- In process
• Shoulder harness mods -- Additions to the fuselage to route shoulder harness and attach inertial reel

Wings

In storage until fuselage is completed.

Engine

Lycoming IO-540-C4B5 Serial #: L-15798-48 Parallel valve, narrow deck engine core as it arrived from Wentworth Aviation in Minnesota. Ready to disassemble.

Here's my Flickr photo gallery. I'll move pics over here when topics require.

Rebuild

I have rebuilt this core engine after it suffered a prop strike during a gear-up landing in a Piper Aztec in 2014. Nearly every component of the bottom end was in good serviceable condition save for the crankshaft, which was cranked at an oil cross tube. Replacement crankshaft is from a O-540-F1A5 out of a Robinson R-44.

This has been the most thorough and complete task of the Bearhawk build thus far.

To do:

• Bolt cylinders on - DONE
• Install oil drain-back nipples in case - DONE
• Install idler gears - DONE
• Determine which gears are being omitted from accessory case - DONE
• Clean pushrods in Graham's parts washer - DONE
• Powdercoat intake tube clamps or find machined new ones - DONE
• Cut new intake pipe hose into 1.75-2.00" sections
• Constant pressure clamp pliers
• Rocker covers, gaskets, hardware - INSTALLED
• Intercylinder baffles - INSTALLED

Ignition and injection

Plan is to use FlyEFII System32.

To do:

• Fuel valve mount bracket placement.
• Fuel line routing and design

Lycoming resources

Electrical

Engine related

• EFII essential bus wiring

Lighting

Wire and components BOM