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Old Jan 25, 2010, 09:11 AM
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España, CL, Ávila
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Idea
Anybody seen a dual swingarm RC bike?

Hi...

I´m thinking if anybody (other than Pumilio...) tried to build a dual swingarm RC bike...

I´m doing this at the small 1/8 scale and I have found several issues to comment about the front steering/suspension/geometry.

Any help and links will be appreciated.

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Old Jan 25, 2010, 09:30 AM
Occasional useful idiot...
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Do you mean a hossack type front end you are trying?
The TT SB-5 has one, wait a few weeks for the launch then just copy it from a picture and scale it down.
You could always look here for inspiration www.tonyfoale.com the article 'Steering for the future' is quiet interesting.
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Old Jan 25, 2010, 09:34 AM
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this one was at the worlds in Germany made by Alessio from Italy.



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Old Jan 25, 2010, 09:38 AM
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Yes I saw this one too. I dont want to know how much energy went into it. I am having trouble handling the design on my little bike.... It worked well as far as I can recall.
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Old Jan 25, 2010, 01:14 PM
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Thank you all.

I´ll post some pics of my design soon, but I have to tell you that it´s a lot different (mono leg, in fact...) and I´m working to keep front trail constant during suspension compression.

As far I can see, the proto you´ve seen in Germany adds trail when compressing front suspension...

Mine not...
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Old Jan 25, 2010, 01:55 PM
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Quote:
Originally Posted by trf_414_m2 View Post
Thank you all.

I´ll post some pics of my design soon, but I have to tell you that it´s a lot different (mono leg, in fact...) and I´m working to keep front trail constant during suspension compression.

As far I can see, the proto you´ve seen in Germany adds trail when compressing front suspension...

Mine not...
I've built a Hossack style front end for my speed bike,double wishbones and constant trail.Biggest problem apart from my over engineering it was coupling the steering servo,ended up with a steering servo that moves up and down with the compression.
I built it to lower the frontal area.Not got any pics because I haven't tested it yet.

Allan
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Old Jan 25, 2010, 02:00 PM
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http://www.tiermotor.com/index.html

http://www.tiermotor.com/Tier%20Steering.pdf
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Old Jan 26, 2010, 01:18 PM
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Incredible...

The Ricky Carmichael steering system rotated 90º and fitted to a full size road bike...

Funny conversion.
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Old Jan 26, 2010, 01:32 PM
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Just a pic of my design...

Rear end with motor mount, no final swingarm displayed (OTO unit will fit...)

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Old Jan 26, 2010, 07:59 PM
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Bimota Tesi 1D? Take a look, not RC but an idea to study.
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Old Jan 27, 2010, 04:42 AM
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Originally Posted by Chris Nicastro View Post
Bimota Tesi 1D? Take a look, not RC but an idea to study.
Why not RC its been done on many real sizes bikes ,
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Old Jan 27, 2010, 04:51 AM
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Why not RC its been done on many real sizes bikes ,
the problem with RC is lack of space. so many little mechanical bits that need to be crammed into a small wheel.
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Old Jan 27, 2010, 05:01 AM
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Quote:
Originally Posted by Torrance View Post
the problem with RC is lack of space. so many little mechanical bits that need to be crammed into a small wheel.
Ok Thanks Torrance. I did wonder why.

See you in France,

Graham
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Old Jan 27, 2010, 10:14 AM
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Another tip from my design...

Front wheel



This is a 2.15" front wheel from a BJ Concepts B4 off road buggy. Plenty of room inside to place the steering system, even when narrowed to the standard 1/8 bike front wheel size....

Remember, I said "mono leg".
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Old Jan 27, 2010, 01:52 PM
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2.15" is 54.61mm. i measured my OTO front rim and it is 55mm. those wheels should work!
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