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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> calling all Engineers! /cgi-bin/YaBB.pl?num=1285134103 Message started by JohnBoy on 09/21/10 at 22:41:42 |
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Title: calling all Engineers! Post by JohnBoy on 09/21/10 at 22:41:42 I had a wild idea that I would like your feed back on. I was considering building a small leaf spring out of fiberglass or carbon fiber that would sit under the seat pan between the frame rails. I don't think that it would have to flex more than an inch or so since I already got pretty good shocks on the bike. If I designed the seat pan to hinge at the front and mount the leaf spring over the air box it ought to sit directly under my fat a$$. If the seat's rear mounting tabs were cut with slots instead of holes, the seat mounting bolts would keep the seat centered while allowing it to ride up and down on the leaf spring. Guys this is a very rough plan so tell me what you think and don't be afraid to rip it apart. I also thought about a seat with a double seat pan and a small air bladder between them. If you ran an air valve out through a hole in the bottom seat pan you could adjust the air pressure to your road condition. Ten pounds of pressure ought to be plenty. So...give me feedback! |
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Title: Re: calling all Engineers! Post by Serowbot on 09/21/10 at 22:55:52 Well,... If I was thinking along those lines, I might be checkin' swap-meets and yard sales for a used compound bow... :-?...?.... |
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Title: Re: calling all Engineers! Post by verslagen1 on 09/21/10 at 23:21:32 I would be looking for a bar of spring wide enough to mount to the tank mount bolt and long enough to bolt to the frame for support. and of course long enough to put your butt on. Being that wide you won't need frame supports in the back. But you might wan't to tie it down so it isn't flying up in the air when your but isn't on it. put some soft rubber bumpers between the seat bottom and frame. You don't want to bottom out on a hard bump directly on the frame. If you're looking for an air bladder, look at HD police seats, it's all there. |
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Title: Re: calling all Engineers! Post by youzguyz on 09/22/10 at 03:28:14 0C292E2804293F460 wrote:
I don't think an air bladder would work. Quite bouncy unless it had some sort of valving to act more like a shock absorber. The Air Hawk seat pad is built that way. I made my own seat by putting one of those on top of the pan (along with a little foam and such) then recovering. Been working fine for many years and miles. |
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Title: Re: calling all Engineers! Post by Routy on 09/22/10 at 04:52:28 All I can tell you,....as you may already know, it is real hard to beat fiberglass for leaf spring material. It comes in all thicknesses, and can be cut w/ any type saw w/ a sharp blade, and drilled w/ any wood drill. I built a Quadracycle w/ fiberglass suspension all 4 wheels,....and also 2 wheel hiway trailers, using it too. |
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Title: Re: calling all Engineers! Post by verslagen1 on 09/22/10 at 07:09:44 786E79647C69647F0B0 wrote:
Find a local archery range or shop, probably could pick up one from a busted set for free. |
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Title: Re: calling all Engineers! Post by JohnBoy on 09/23/10 at 18:26:48 http://lh6.ggpht.com/_TCSH6bqjHEM/TJv6fWJt0tI/AAAAAAAAA1Y/Rn-chX08Ujk/s512/leaf%20spring.jpg Here is what I had in mind. It seems to me that the glass lay-up would be pretty straight forward. I think you could dial in the spring tension by the width you make the spring. My problem is that I am not an engineer, and I don't know much about the workings of a leaf spring. JB |
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Title: Re: calling all Engineers! Post by verslagen1 on 09/23/10 at 19:10:35 1st, when you sit on it, the crown is going to get flatter and that will make the top part longer. This will work until the hooks are forced against the frame tubes. So you got to build in a lot of side to side play. |
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Title: Re: calling all Engineers! Post by bill67 on 09/23/10 at 19:13:10 Use Klotz gear on the frame and it will move smoother. |
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Title: Re: calling all Engineers! Post by Serowbot on 09/23/10 at 19:20:10 03080D0D5756610 wrote:
... or,...just inject some Klotz into your butt cheeks and you'll have nice fluid cushion... ...and it's low in cholesterol too!... ;D... |
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Title: Re: calling all Engineers! Post by JohnBoy on 09/23/10 at 21:24:52 1006110C14010C17630 wrote:
... or,...just inject some Klotz into your butt cheeks and you'll have nice fluid cushion... ...and it's low in cholesterol too!... ;D...[/quote] HaHaHa...That might actually work! |
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Title: Re: calling all Engineers! Post by verslagen1 on 09/23/10 at 21:53:51 Suggestion, make the curved top sheet as you've shown. On one side, clamp it to the frame as you've shown with the hook, but loose enough to pivot. On the other side, hook it from the outside and make the hook long enough that as the seat flattens it won't come unhooked. |
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Title: Re: calling all Engineers! Post by babyhog on 09/24/10 at 08:22:48 283B2C2D323F393B306F5E0 wrote:
but then wouldn't your a$$ shift to one side as you bounce? A heavy a$$ would be off center.... :-/ |
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Title: Re: calling all Engineers! Post by bill67 on 09/24/10 at 08:29:38 It sure would. |
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Title: Re: calling all Engineers! Post by bill67 on 09/24/10 at 08:31:46 Were it curves around your frame make those longer and it should work,More like a slot. |
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Title: Re: calling all Engineers! Post by verslagen1 on 09/24/10 at 09:28:42 2C2F2E23213B420 wrote:
but then wouldn't your a$$ shift to one side as you bounce? A heavy a$$ would be off center.... :-/[/quote] I Thought this is a spring to hold up an indendently hinged seat. So the amount of side shift will be neglectable. Otherwise, you are sitting on the frame with a little center cush. |
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Title: Re: calling all Engineers! Post by Serowbot on 09/24/10 at 10:17:06 As drawn,.. all the stress goes into the mounting points,... Add a shackle,... now you can flex... ;)... http://www.banburytrailers.co.uk/images/swinglink.jpg |
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