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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Shock Strut Material Engineering Change for 4-Place and Patrol

The landing gear shock strut has been changed on the 4 Place Bearhawk and the Patrol. This change was done to increase gear side load capability (ground loops) and cost reduction. The streamline tubing has been replaced with round tubing (1 1/8 x .065"). The shock strut should be faired for reduced drag. shockstruts Scan0062 Safety update terminology: ENGINEERING CHANGE: A change to current serial number drawings onward - non-mandatory - may or may not be published. This change is the result of a product improvement, update or modification. Or a minor change of the design to ease manufacturing, maximize utility, economize materials or ease assembly.

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