Tailwheel Assembly Drawing

Articles with the green titles are part of a kit builder manual section that is still under development. If you are the owner of a quick-build kit for a 4-Place Bearhawk and would like to participate in beta testing, please let us know!

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Service Notification for Patrol and LSA Kit Tail Struts

Bearhawk Aircraft Service Notification June 16, 2020 – For questions call Mark Goldberg, 512-626-7886 The horizontal stab strut for the Patrol and LSA share a common design feature on the top – how they are attached to the leading edge tube of the horizontal stab. An AN5 bolt has its head removed, and it is heated and forged flat with the 3/16” hole drilled for attaching to the horizontal stab with an AN3 bolt. The factory also cuts some more threads to add additional adjustment length. Some of these parts have left the factory improperly forged. The forged part (where the 3/16” hole is) needs to be flat so it fits flat against the bottom of the horizontal stab tube and also have the nut on the bottom fit flat. The parts not forged properly have an angle to them and are not flat on both sides. This can put stress on the AN3 bolt. There are two ways to fix this part if you have one or two that are not forged flat. One side can be ground down flat on a bench grinder if the remaining material is at least 1/8” thick. Of course any roughness or marks from the grinding would need to be polished/sanded out. Bob Barrows does a different fix for a situation like this that requires welding. A washer is tack welded to the “fatter” side of this part where the attach hole is. Then the other side of this washer is adjusted so it is flat compared to the other side. Then finish welded in place. Please inspect these parts that came with your Patrol or LSA kit. If they have this problem you should try to make the “repair” as detailed above. If you are unhappy with the result for any reason, let us know and we will replace these for you.

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Plans Update for the Patrol: Forward Wing Skin Stiffener

Bob issued a plans update for the Patrol which can be found here: http://bearhawksafety.com/Patrol/february2020.html
To elaborate more, Bob says while looking at a photo of a Patrol in flight, he noticed the oil canning in the three bays on each side of the wing strut attachment point. His desire to reduce this was not a matter of structure but rather to improve the effectiveness of the airfoil, by more consistently maintaining its shape. In other words, the airfoil will perform better without the deflection. This is why there is no need to make the change to airplanes that are already past this point of construction.
In the plans photo to the right, the leading edge is at the bottom. There are two arrows pointing to the location of the new stiffener, one marked with a “*”. Making the channel as described will require a 12-foot brake. Bob says if you aren’t able to find a 12-foot brake, a 10 or 8 foot piece would be better than nothing. If you shorten the length, be sure to center the stiffener around the wing strut attach point, since that’s where the stiffness is needed.

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