03-12-2012, 11:19 AM | #21 |
RCP CRAWLERS Join Date: Nov 2007 Location: Upland CA
Posts: 1,541
| Re: Progress II
well the carbon fiber just can't hold up to my hard driving torn the front upper link out of the Chassis not once but twice.... so I'm going to try 1/16" aluminum (suggested by Jake Wright) I'll be sending them out to my drivers this week. the chassis performed well... the link geometry and shock adjustments give this thing a ton of set-ups. Last edited by ZoSo; 03-12-2012 at 02:16 PM. |
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03-12-2012, 12:32 PM | #22 |
Shelf queen Join Date: Aug 2008 Location: Internet
Posts: 5,857
| Re: Progress II
Bummer to hear that. Could staggering the link holes a bit or spacing them a hair farther apart (to provide more material around the holes) or even the simple use of a flat washer on oth sides of the CF have prevented this? I was really excited to see more CF chassis options out on the market and would think some minor changes would allow you to keep the CF in favor of just pushing an aluminum version to the market. |
03-12-2012, 01:06 PM | #23 |
Rock Crawler Join Date: May 2011 Location: SoCal
Posts: 949
| Re: Progress II
Say Dave, not quite sure what you meant by going to 1/16 aluminum. But how about using the 1/16 aluminum for a bolt-on doubler? Make four small rectangular plates that match the CF in the front link area. They should be just long enough to fit 3 holes of your pattern. Then use like washers on both sides of the CF. The upper link goes in the middle hole and put a short nut and bolt in the two end holes. That spreads your load out over a much larger area. And does very little to overall weight. You may have to fuss with it to get everything to clear. Like use flatheads for the end bolts if buttonheads hit the rod end. Or make the plates longer to grab holes further away, etc. But the principle is something we do in missiles and spacecraft all the time to get localized strength upgrade without making the whole thing heavier. |
03-12-2012, 01:13 PM | #24 | |
Quarry Creeper Join Date: Dec 2010 Location: Phelan California
Posts: 370
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03-12-2012, 01:54 PM | #25 |
Shelf queen Join Date: Aug 2008 Location: Internet
Posts: 5,857
| Re: Progress II
I think he meant switch from CF to 1/16" aluminum. And if light weight is a goal, then the addition of 4 doublers plus 8 additional screws and 8 lock nuts would seem excessive no? I think staggering /spacing the holes a little more or just sandwiching the link hole in use with 2 washers will solve it.
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03-12-2012, 02:08 PM | #26 | |||
RCP CRAWLERS Join Date: Nov 2007 Location: Upland CA
Posts: 1,541
| Re: Progress II Quote:
the aluminum version will be for testing I will make a CF version or maybe Applications - Curv® - Propex Fabrics Quote:
thanks wam I'll try the "beef up mod" on the next CF I cut Quote:
I just need to get some more testing done ...so I'll send the Aluminum version out to my drivers for testing the "curv" material looks interesting Last edited by ZoSo; 03-12-2012 at 02:20 PM. | |||
03-12-2012, 02:09 PM | #27 | |
Rock Crawler Join Date: May 2011 Location: SoCal
Posts: 949
| Re: Progress II Quote:
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03-12-2012, 02:15 PM | #28 |
Shelf queen Join Date: Aug 2008 Location: Internet
Posts: 5,857
| Re: Progress II
I think photos would help. It could have been as simple as holes that were to big, as CR will suck into a drill bit a tad. And I still think washers on both sides are a better solution than doublers. |
03-12-2012, 02:15 PM | #29 | |
RCP CRAWLERS Join Date: Nov 2007 Location: Upland CA
Posts: 1,541
| Re: Progress II Quote:
I try to break it...and when I can't break it....It's good to go!!!! Do you know anything about this CURV material? Applications - Curv® - Propex Fabrics# | |
03-12-2012, 02:18 PM | #30 | |
I wanna be Dave Join Date: Dec 2009 Location: .
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| Re: Progress II Quote:
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03-12-2012, 02:24 PM | #31 |
RCP CRAWLERS Join Date: Nov 2007 Location: Upland CA
Posts: 1,541
| Re: Progress II |
03-12-2012, 03:11 PM | #32 |
I wanna be Dave Join Date: Oct 2008 Location: I miss Rowdy
Posts: 2,238
| Re: Progress II
Is it possible that you just used a low grade CF? The weave pattern on the chassis suggests that it is not a high quality CF. in RC stuff, the tighter the CF weave pattern, the stronger and higher quality it is. I bashed the hell out of my 1/16" cf berg this weekend with no problems at all. But I did have another chassis that used a material tha looked almost identical in weave pattern as yours and it failed rather quickly. |
03-12-2012, 03:50 PM | #33 | |
RCP CRAWLERS Join Date: Nov 2007 Location: Upland CA
Posts: 1,541
| Re: Progress II Quote:
I was trying to use some scape material from a friend ...to make the chassis more affordable...but that didn't work out I'll try a couple other vendors with a tighter weave | |
03-12-2012, 03:52 PM | #34 | |
Quarry Creeper Join Date: Dec 2010 Location: Phelan California
Posts: 370
| Re: Progress II Quote:
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03-12-2012, 05:32 PM | #35 |
Rock Crawler Join Date: May 2011 Location: SoCal
Posts: 949
| Re: Progress II
Just so you know, a lot of people have a slightly false impression of carbon fiber. It got it's excellent reputation for strength and stiffness in layup designs. Custom designs for a load-carrying applications where you choose how many fibers to put in which directions. But this is just generic sheet. Since it just has a light cross-pattern of fibers, it's not particularly strong compared to it's custom brothers. And as you found out, the edges are particularly weak because there are so few fibers between the hole and edge of the sheet. If possible provide more edge distance for the holes in the future. Not saying CF is bad stuff. It just doesn't always meet high expectations. Be sure to seal cut edges with CA (superglue) or something to help keep the edges intact. BTW, show of hands -- how many people knew that carbon fiber is not lighter than Delrin? In fact it's slightly heavier. But much stiffer...a good thing. It's funny how many people want to replace Delrin with the same thickness CF to save a ton of weight. |
03-12-2012, 07:40 PM | #36 |
Shelf queen Join Date: Aug 2008 Location: Internet
Posts: 5,857
| Re: Progress II
How do I virtually show my hands? Like this or this ? JK. |
06-25-2012, 11:02 AM | #37 |
RCP CRAWLERS Join Date: Nov 2007 Location: Upland CA
Posts: 1,541
| Re: Progress II
well the Aluminum version has held up great I beat her very hard at the SoCal Regionals last weekend and she not only survived but took low score on two of the courses nice and lightweight 2.3 oz....sococrawler's weighed Aluminum version http://i924.photobucket.com/albums/a...c/81504d40.jpg I finally changed back to a body....DiverDown Last edited by ZoSo; 06-25-2012 at 11:04 AM. |
06-25-2012, 11:28 AM | #38 |
Its a HARDKNOCKZ Life... Join Date: Feb 2011 Location: Southern Kali...
Posts: 2,469
| Re: Progress II
That lid makes me wanna get a haircut...if I HAD hair that is. Don't you laugh Dave...you & I BOTH run the chrome dome. Of course in my case...Im just taller than my hair. Glad that chassis' holdin up & congrats on your Regionals performance. Ya done good Mr. Budd. J.D. |
06-25-2012, 04:15 PM | #39 |
RCP CRAWLERS Join Date: Nov 2007 Location: Upland CA
Posts: 1,541
| Re: Progress II
hey I'm waiting on this guy to paint my lid two rattle cans and some edge tape....... I got what I got Hope all is well |
06-26-2012, 07:34 AM | #40 |
Its a HARDKNOCKZ Life... Join Date: Feb 2011 Location: Southern Kali...
Posts: 2,469
| Re: Progress II |
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