Trials Frame Design Help

skrobo said:

if that was titanium, i would love you, seriously, especially if i could
test it out for ya 🙂

I think a titanium/carbon fibre would be nice as it would be light as a
feather but stronger, durable and longer lasting than steel. 😄
- Another idea would be where the black part is, it could hold
suspensions somehow to withstand high jumps and so forth. 😄

BTW can i have it now plz 😉 😉

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Thanks for the input but what thing would you guys change

And the program is auto desk inventor pro 10

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I dont think I would want open tubes coming out of the top, that could
be dangerous.

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Add suspensions to the sides of the frame and fuse it with the middle.
It would hold in place by tightening a certain part of the frame. I
don't know if this may damage the frame in the process, but it would be
interesting to see and ride 1 day. 😄 Also something that could hold
the sides from moving up and down while riding. Like spencer said, i
could be dangerous as it may hit your arms, knees etc.

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unicyclepa said:

Thanks for the input but what thing would you guys change

And the program is auto desk inventor pro 10

I think you should make the top part in an upside down V shape. It
would be much better in many ways, especially stronger, but don't make
it too much to not put your feet on it well. or maybe make it like the
07 DX frame and angle on bottom, flat on top.

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Quoted message said:

<> Unicycle For Christ <><

____________________________________________
-last edited by \"elvisunifreak\" at 8:35 pm -
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Spencer Hochberg said:

I dont think I would want open tubes coming out of the top, that could
be dangerous.

I agree. I think you should either seal the tops of the tubes or cut
the flush with the black piece. It might take a little bit away from
the style but then you don't have to worry much about a bad injury or
getting stuff stuck in the tube. Those tubes sticking up would make it
really nice when you put your foot on the frame.

EDIT: Also, if you are serious about selling it someday, then you
might want to make it good for street too, because the market might be
a little small if it was only good for trials.

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OK i made tube caps and for jokes i made it in carbon and ti

[image:
http://i80.photobucket.com/albums/j166/unicyclepa/umm/untitled.jpg]

Quoted message said:

EDIT: Also, if you are serious about selling it someday, then you might
want to make it good for street too, because the market might be a
little small if it was only good for trials.

i dont ride street. so that makes a good street frame?

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ohh you used my idea, thank you if you did 😉 I'd love to this on a
coker, 29er or those novelty unicycles one day. That way people don't
have to cut the seatpost to reach the pedals. 😄 😄

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unicyclepa said:

i dont ride street. so that makes a good street frame?

Yeah, this design will be. If it was for pure trials then you would
probably want to make where you would normaly put your foot more
angled, this way it doesn't get in the way of your knees and would
prevent some painful falls. because those tubes come to the top, it
should be perfect for street.

I liked the look of the different colors with the green tubes an black
tube connector. Of course this doesn't have anything to do with the
mechanical design.

Also, are you actually going to have this manufactured? I really like
the look of it and I might consider buying one if you do produce them!

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If you are going for a light frame, ditch the ovalized tubing and go
with square, it puts more metal in the two axis's its needed most, then
you can use thinner wall tubing compared to round or ovalized. That
crown setup is going to be heavy and not as stiff as it could be if you
used some gussets out of tubing or sheet/strip stock running from leg
to crown.

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Hazmat said:

Add suspensions to the sides of the frame and fuse it with the middle.
It would hold in place by tightening a certain part of the frame. I
don't know if this may damage the frame in the process, but it would be
interesting to see and ride 1 day. 😄 Also something that could hold
the sides from moving up and down while riding. Like spencer said, i
could be dangerous as it may hit your arms, knees etc.

Having suspention above the axle would have the same effect as a
suspention seatpost. The idea of a fully suspention uni has been
discussed at length 'here' (http://tinyurl.com/25psjp).

Evan said:

Byrne If you are going for a light frame, ditch the ovalized tubing and
go with square, it puts more metal in the two axes its needed most,
then you can use thinner wall tubing compared to round or ovalized.
That crown setup is going to be heavy and not as stiff as it could be
if you used some gussets out of tubing or sheet/strip stock running
from leg to crown.

But circular and ovalized legs will resist tortional forces better. I
think eliptical legs, like the ones he has pictured is ideal. Wheather
more oval, round, elliptical, square, or rectangular probably needs
more testing. My money is on elliptical.

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Yeah but the legs dont get twisted nearly as much as there is a side
load on the frame sideways, which is where square tubing comes into
play.

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skilewis74 said:

Having suspention above the axle would have the same effect as a
suspention seatpost. The idea of a fully suspention uni has been
discussed at length 'here' (http://tinyurl.com/25psjp).

no i mean have a t-bar suspension that goes from left to right and in
the middle and meets halfway. Something like this. It's a odd-drawing
but it explains what i mean.😄 😄 😄

+-------------------------------------------------------------------+
|Filename: Suspension.JPG |
|Download: http://www.unicyclist.com/attachment/18382 |
+-------------------------------------------------------------------+

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Evan Byrne said:

Yeah but the legs dont get twisted nearly as much as there is a side
load on the frame sideways, which is where square tubing comes into
play.

When jumping you rarely land streight side to side or forward to back,
and almost always at some angle, so rounded sides will take more force
for the given amount of metal. This has been increased in the last few
years in motorcycle disighn.

ie: When Honda came out the new CBR 954 (I think in 2003) They found
the tortional stiffness of the swingarm increased by 25% if they
rounded the corners of it's box tubing.

Look at Ducati's diminance in World Superbike since its inception about
20 years ago. They only use round tubing in their frames.

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Hazmat said:

no i mean have a t-bar suspension that goes from left to right and in
the middle and meets halfway. Something like this. It's a odd-drawing
but it explains what i mean.😄 😄 😄

So where is the wheel, what is it directly connected to?

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I would certainly disagree with your statment about landing straight on
sideways. Watch trials videos, many people land gaps straight sideways.
I think round would be best for the crown because there is a twisting
force on that, but def stick to square on the legs.

skilewis74 said:

When jumping you rarely land streight side to side or forward to back,
and almost always at some angle, so rounded sides will take more force
for the given amount of metal. This has been increased in the last few
years in motorcycle disighn.

ie: When Honda came out the new CBR 954 (I think in 2003) They found
the tortional stiffness of the swingarm increased by 25% if they
rounded the corners of it's box tubing.

Look at Ducati's diminance in World Superbike since its inception about
20 years ago. They only use round tubing in their frames.

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Evan Byrne said:

I would certainly disagree with your statment about landing straight on
sideways.

But perfectly?

Almost every landing I've seen had some angle to it. Even the ones
where they landed "streight", the angle was like 5-15 degrees. Thats
all it takes over time.

It would be great if it could be tested by a machine to find out what
design works best, but I don't see how it could generate the stresses
in the same way a rider does and all the different riding styles. The
best I think we can hope for is a machine that would very specific
forces in a several specific directions to a series of designs, and all
taken on a test run w/ the same rider testing all designs. Then retest
them to find how stressed/worn those areas are. Find the design that
elliminates all the week spots, and produce that frame. All that may
be too expensive for our small sport though, and just go w/ trial and
error.

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Not really, its not needed. Kh framees are about as light as anyone is
going to need/want.

skilewis74 said:

It would be great if it could be tested by a machine to find out what
design works best, but I don't see how it could generate the stresses
in the same way a rider does and all the different riding styles. The
best I think we can hope for is a machine that would very specific
forces in a several specific directions to a series of designs, and all
taken on a test run w/ the same rider testing all designs. Then retest
them to find how stressed/worn those areas are. Find the design that
elliminates all the week spots, and produce that frame. All that may
be too expensive for our small sport though, and just go w/ trial and
error.

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ive got inventor pro 11 at home, its great !

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