Original Posted By: "David B. Schober"
Bill, I'm currently rebuilding a wrecked Pietenpol. It crashed on right wingbreaking the spares outboard of struts, taking off the landing gear andscraping along the bottom. This plane had both the cross wireattachements and the rods forward to the engine mount. The wingstayed perfectly in place but the rod on the opposite side bent about twoinches out of alignment, apparently from a twisting force. Although somewould say over kill, I personally favor using both. I've read elsewhere from some of our experts that the cross wires aregreat while adjusting the CG --then removing them and depending uponthe rods forward to the motor mount. I saw all three set ups atBroadhead. Bill Conway________________________________________________________________________________
Pietenpol-List: Cross wire attachments -Reply
Pietenpol-List: Re: Cross wire attachments -Reply
Original Posted By: Barry Davis
Tabs under bolt heads are fine. The tensile and shearstrength of the fittings are far far beyond what whatwill be experienced in flight.You should use fairly stout struts from the forwardcabane to the engine mount, primarily to reduce the chance of them collapsing under a forward crash impact.This lets the center section come down on the passenger'shead.I am not keen on the x bracing fo/aft, because of the possibility of cutting up your passenger's head in an accident.________________________________________________________________________________
Tabs under bolt heads are fine. The tensile and shearstrength of the fittings are far far beyond what whatwill be experienced in flight.You should use fairly stout struts from the forwardcabane to the engine mount, primarily to reduce the chance of them collapsing under a forward crash impact.This lets the center section come down on the passenger'shead.I am not keen on the x bracing fo/aft, because of the possibility of cutting up your passenger's head in an accident.________________________________________________________________________________
Pietenpol-List: Re: Cross wire attachments -Reply
Original Posted By: jkahn(at)picasso.dehavilland.ca (John Kahn)
The cross wires are primarily to adjust the position of the wing for and aft toadjust for CG position. Once the appropriate wing position is found for neutraltrim, for ease of egress of the front cockpit the struts are placed going fromthe upper wing fittings to the upper engine mount fittings. The solid struts area better method since cables will stretch over time and the adjusment willchange. If you wish to use both systems so be it. If you raise the height of thewing keep in mind that the overall geomitry will change and the angles used andassociated forces will change. Get out the calculator and make sure that thesystem you use is sufficient and that the attach fittings are OK.William Conway wrote:> Bill, I'm currently rebuilding a wrecked Pietenpol. It crashed on right wing> breaking the spares outboard of struts, taking off the landing gear and> scraping along the bottom. This plane had both the cross wire> attachements and the rods forward to the engine mount. The wing> stayed perfectly in place but the rod on the opposite side bent about two> inches out of alignment, apparently from a twisting force. Although some> would say over kill, I personally favor using both.>> I've read elsewhere from some of our experts that the cross wires are> great while adjusting the CG --then removing them and depending upon> the rods forward to the motor mount. I saw all three set ups at> Broadhead. Bill Conway--David B.Schober, CPEInstructor, Aviation MaintenanceFairmont State CollegeNational Aerospace Education CenterRt. 3 Box 13Bridgeport, WV 26330-9503(304) 842-8300________________________________________________________________________________
The cross wires are primarily to adjust the position of the wing for and aft toadjust for CG position. Once the appropriate wing position is found for neutraltrim, for ease of egress of the front cockpit the struts are placed going fromthe upper wing fittings to the upper engine mount fittings. The solid struts area better method since cables will stretch over time and the adjusment willchange. If you wish to use both systems so be it. If you raise the height of thewing keep in mind that the overall geomitry will change and the angles used andassociated forces will change. Get out the calculator and make sure that thesystem you use is sufficient and that the attach fittings are OK.William Conway wrote:> Bill, I'm currently rebuilding a wrecked Pietenpol. It crashed on right wing> breaking the spares outboard of struts, taking off the landing gear and> scraping along the bottom. This plane had both the cross wire> attachements and the rods forward to the engine mount. The wing> stayed perfectly in place but the rod on the opposite side bent about two> inches out of alignment, apparently from a twisting force. Although some> would say over kill, I personally favor using both.>> I've read elsewhere from some of our experts that the cross wires are> great while adjusting the CG --then removing them and depending upon> the rods forward to the motor mount. I saw all three set ups at> Broadhead. Bill Conway--David B.Schober, CPEInstructor, Aviation MaintenanceFairmont State CollegeNational Aerospace Education CenterRt. 3 Box 13Bridgeport, WV 26330-9503(304) 842-8300________________________________________________________________________________