---------------------------------------------------------- Zenith701801-List Digest Archive --- Total Messages Posted Tue 01/11/11: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:04 AM - Predrilling the short strut end 5/16 bolt holes - CH701 (Robert N. Eli) 2. 05:38 AM - Re: Predrilling the short strut end 5/16 bolt holes - CH701 (John Bolding) 3. 06:10 AM - Re: Predrilling the short strut end 5/16 bolt holes - CH701 (MacDonald Doug) 4. 11:57 AM - Re: Predrilling the short strut end 5/16 bolt holes - CH701 (Robert N. Eli) 5. 12:54 PM - Re: Predrilling the short strut end 5/16 bolt holes - CH701 (MacDonald Doug) ________________________________ Message 1 _____________________________________ Time: 05:04:42 AM PST US From: "Robert N. Eli" Subject: Zenith701801-List: Predrilling the short strut end 5/16 bolt holes - CH701 Folks, I am predrilling the short strut ends (of the two piece struts) for the 5/16 bolt that attaches it to the wing strut fittings (reference drawing 7-V-10). The U-tab gap on the front strut end is reasonably close to the thickness of the strut fitting assembly; however, the rear strut end has a gap that is larger than what is specified on drawing 7-V-10 (which is 1/8 inch). My gap is closer to 3/16, and is about twice the thickness of the rear strut fitting (which is 0.09 in). I am hesitant to rely on using the bolt to draw-down this much of a gap. It seems to me that it would be better to use a shim to take some of excess gap in the U-tab. Does anyone have a recommendation on what works best to deal with this issue? Robert N. Eli CH701 ________________________________ Message 2 _____________________________________ Time: 05:38:25 AM PST US From: "John Bolding" Subject: Re: Zenith701801-List: Predrilling the short strut end 5/16 bolt holes - CH701 You are correct, don't draw it in, shim it to fit. The wider the vacant space the more bending load you place on the bolt, this is a shear loading application, think I might ask Zenith if a shim is sufficient. John ----- Original Message ----- From: Robert N. Eli To: Zenith701801-list@matronics.com Sent: Tuesday, January 11, 2011 7:01 AM Subject: Zenith701801-List: Predrilling the short strut end 5/16 bolt holes - CH701 Folks, I am predrilling the short strut ends (of the two piece struts) for the 5/16 bolt that attaches it to the wing strut fittings (reference drawing 7-V-10). The U-tab gap on the front strut end is reasonably close to the thickness of the strut fitting assembly; however, the rear strut end has a gap that is larger than what is specified on drawing 7-V-10 (which is 1/8 inch). My gap is closer to 3/16, and is about twice the thickness of the rear strut fitting (which is 0.09 in). I am hesitant to rely on using the bolt to draw-down this much of a gap. It seems to me that it would be better to use a shim to take some of excess gap in the U-tab. Does anyone have a recommendation on what works best to deal with this issue? Robert N. Eli CH701 ________________________________ Message 3 _____________________________________ Time: 06:10:12 AM PST US From: MacDonald Doug Subject: Re: Zenith701801-List: Predrilling the short strut end 5/16 bolt holes - CH701 Robert, this might be a silly question but are you sure that you don't have the front fitting for the other side?- Possibly Zenith sent the wrong on e if this is a kit plane.- I scratch built mine so they fit really well. - Also, is it possible to close the gap in the fork in-a vise so that there is no bending load applied to the tabs when installed? - Doug MacDonald CH-701 C-GBQX NW Ontario, Canada - Do Not Archive --- On Tue, 1/11/11, Robert N. Eli wrote: From: Robert N. Eli Subject: Zenith701801-List: Predrilling the short strut end 5/16 bolt holes - CH701 Received: Tuesday, January 11, 2011, 7:01 AM Folks, - I am predrilling the short strut ends (of the two piece struts) for the 5/1 6 bolt that attaches it to the wing strut fittings (reference drawing 7-V-1 0). The U-tab gap on the front strut end is reasonably close to the thickne ss of the strut fitting assembly; however, the rear strut end has a gap tha t is larger than what is specified on drawing 7-V-10 (which is 1/8 inch). M y gap is closer to 3/16, and is about twice the thickness of the rear strut fitting (which is 0.09 in). I am hesitant to rely on using the bolt to dra w-down this much of a gap. It seems to me that it would be better to use a shim to take some of excess gap in the U-tab. Does anyone have a recommenda tion on what works best to deal with this issue? - Robert N. Eli CH701 =0A=0A ________________________________ Message 4 _____________________________________ Time: 11:57:23 AM PST US From: "Robert N. Eli" Subject: Re: Zenith701801-List: Predrilling the short strut end 5/16 bolt holes - CH701 Doug, I do have the full set of front and rear strut ends (thanks to Tommy Walker's generosity), with the individual part number stickers in place on each part. The front and rear strut ends have the appropriate different gap widths between the U flange. You are getting at one of the issues, and that is that the U is fabricated out of one piece of 4130 and none of my strut ends have the tab portions exactly parallel due to, apparently, some spring-back during manufacturing. I did close the gap (make them parallel) using the vice. There is considerable spring-back, so I had to close the gap quite a bit in the vice so that they would spring-back to a parallel condition. But, even with this process to help matters, I still have a significant gap of 2 mm between the rear strut fitting and the strut end tab. I don't want to depend on the bolt to pull the tabs down to the strut fitting since this will pull things out of parallel in the other direction, and not produce a good flat contact surface between the parts. I have tentively decided to use a steel shim to fill the 2 mm gap, but will check with Zenith to see if it sounds OK to them. Robert ----- Original Message ----- From: MacDonald Doug To: zenith701801-list@matronics.com Sent: Tuesday, January 11, 2011 9:07 AM Subject: Re: Zenith701801-List: Predrilling the short strut end 5/16 bolt holes - CH701 Robert, this might be a silly question but are you sure that you don't have the front fitting for the other side? Possibly Zenith sent the wrong one if this is a kit plane. I scratch built mine so they fit really well. Also, is it possible to close the gap in the fork in a vise so that there is no bending load applied to the tabs when installed? Doug MacDonald CH-701 C-GBQX NW Ontario, Canada Do Not Archive --- On Tue, 1/11/11, Robert N. Eli wrote: From: Robert N. Eli Subject: Zenith701801-List: Predrilling the short strut end 5/16 bolt holes - CH701 To: Zenith701801-list@matronics.com Received: Tuesday, January 11, 2011, 7:01 AM Folks, I am predrilling the short strut ends (of the two piece struts) for the 5/16 bolt that attaches it to the wing strut fittings (reference drawing 7-V-10). The U-tab gap on the front strut end is reasonably close to the thickness of the strut fitting assembly; however, the rear strut end has a gap that is larger than what is specified on drawing 7-V-10 (which is 1/8 inch). My gap is closer to 3/16, and is about twice the thickness of the rear strut fitting (which is 0.09 in). I am hesitant to rely on using the bolt to draw-down this much of a gap. It seems to me that it would be better to use a shim to take some of excess gap in the U-tab. Does anyone have a recommendation on what works best to deal with this issue? Robert N. Eli CH701 ist" target=_blank rel=nofollow>http://www.matronics.com/Navigator?Zenith701801-List =nofollow>http://forums.matronics.com blank rel=nofollow>http://www.matronics.com/contribution ________________________________ Message 5 _____________________________________ Time: 12:54:10 PM PST US From: MacDonald Doug Subject: Re: Zenith701801-List: Predrilling the short strut end 5/16 bolt holes - CH701 Sounds to me like the fittings were made incorrectly.- Zenith will likely replace them.- 2mm is a pretty big gap.- While I'm sure a shim will fi x your problem, you paid for a properly built part, Zenith should provide i t.- It's been my experience that they are-great to deal with so I am su re they will help you out. - Doug MacDonald - Do Not Archive --- On Tue, 1/11/11, Robert N. Eli wrote: From: Robert N. Eli Subject: Re: Zenith701801-List: Predrilling the short strut end 5/16 bolt h oles - CH701 Received: Tuesday, January 11, 2011, 1:54 PM Doug, - I do have the full set of front and rear strut ends (thanks to Tommy Walker 's generosity), with the individual part number stickers in place on each p art. The front and rear strut ends have the appropriate different gap width s between the U flange. You are getting at one of the issues, and that is t hat the U is fabricated out of one piece of 4130 and none of-my strut end s have the tab portions exactly parallel-due to, apparently, some spring- back during manufacturing. I did close the gap (make them parallel) using t he vice. There is considerable spring-back, so I had to close the gap-qui te a bit-in the vice so that they would spring-back to a parallel conditi on. But, even with this process to help matters, I still have a significant gap of 2 mm between the rear strut fitting and the strut end tab. I don't want to depend on the bolt to pull-the tabs down to the strut fitting sin ce this will pull things out of parallel in the other direction, and not produce a good flat contact surface between the parts. I have tentively de cided-to use a steel shim to fill the 2 mm gap, but will check with Zenit h to see if it sounds OK to them. - Robert - ----- Original Message ----- From: MacDonald Doug Sent: Tuesday, January 11, 2011 9:07 AM Subject: Re: Zenith701801-List: Predrilling the short strut end 5/16 bolt h oles - CH701 Robert, this might be a silly question but are you sure that you don't have the front fitting for the other side?- Possibly Zenith sent the wrong on e if this is a kit plane.- I scratch built mine so they fit really well. - Also, is it possible to close the gap in the fork in-a vise so that there is no bending load applied to the tabs when installed? - Doug MacDonald CH-701 C-GBQX NW Ontario, Canada - Do Not Archive --- On Tue, 1/11/11, Robert N. Eli wrote: From: Robert N. Eli Subject: Zenith701801-List: Predrilling the short strut end 5/16 bolt holes - CH701 Received: Tuesday, January 11, 2011, 7:01 AM Folks, - I am predrilling the short strut ends (of the two piece struts) for the 5/1 6 bolt that attaches it to the wing strut fittings (reference drawing 7-V-1 0). The U-tab gap on the front strut end is reasonably close to the thickne ss of the strut fitting assembly; however, the rear strut end has a gap tha t is larger than what is specified on drawing 7-V-10 (which is 1/8 inch). M y gap is closer to 3/16, and is about twice the thickness of the rear strut fitting (which is 0.09 in). I am hesitant to rely on using the bolt to dra w-down this much of a gap. It seems to me that it would be better to use a shim to take some of excess gap in the U-tab. Does anyone have a recommenda tion on what works best to deal with this issue? - Robert N. 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