Why asymetric steering bellcranks?

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Why asymetric steering bellcranks?

Post by Lonestar »

Howdy yall

I've had this one on top of my head a few times but never got to ask... but as I'm working on getting the LXT ready for action in May, it comes back to the surface again:

why the steering bellcrank asymetry on the first-gen losi steering bellcrank design? What is the obvious bit I'm missing here? Why the off-center hole and the longer left bellcrank?

(pic courtesy of ebay :mrgreen: )

Image

Thanks

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Re: Why asymetric steering bellcranks?

Post by jwscab »

that's always bugged me. the only thing that comes to mind is it's for ackermann geometry.

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Re: Why asymetric steering bellcranks?

Post by Lonestar »

mmh... that certainly influences ackermann angles, but in an asymetric way... :shock:
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Re: Why asymetric steering bellcranks?

Post by GoMachV »

Common core math :lol:
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Re: Why asymetric steering bellcranks?

Post by threesheds »

Anything to do with asymetry of servo?

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Re: Why asymetric steering bellcranks?

Post by badnat »

Ok i thought it was quite obvious for everyone here fellowers ... and that i was dumb :shock: so i never asked :roll:
Happy to see your confession on that subject’... i feel better now (big breath) :mrgreen:

Btw if anyone can help, i would really appreciate ...

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Re: Why asymetric steering bellcranks?

Post by RC10th »

Possibly for roundy round racing ? Or someone made a mistake and set the machine up wrong ?
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Re: Why asymetric steering bellcranks?

Post by GoMachV »

My thoughts were that they optimized it for a centered servo, which moved the crank over a bit, and putting the cranks too close would not be optimum. By offsetting both the sweep is somehow corrected with the geometry of the longer input side. I have NO idea if this is why, not any proof, but it was always my feeling
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Re: Why asymetric steering bellcranks?

Post by TRX-1-3 »

My RIGHT bellcrank is longer. :roll: ha ha

When I got my JRX2 I also noticed this. I looked around at aftermarket / period "hop up" steering kits and they did not seem to be asymmetrical, further intriguing me. Maybe it's one of those Losi "one eye covered" inside jokes?
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Re: Why asymetric steering bellcranks?

Post by Lonestar »

So no-one knows for sure... I love it :mrgreen: I like Jeff's tentative explanation tho :!:

@mytimac can you please ask Gil next time you see him? :D
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Re: Why asymetric steering bellcranks?

Post by mytimac »

Yeah, let me get the plane and ask him. :P
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Re: Why asymetric steering bellcranks?

Post by ThunderDan »

I think it was because of the original servo saver bendy arm setup. It may have been a work around to extend the the bendy arm and move the hole forward in the rack as they may have found the equal length drag link / driven bendy link resulted in too easily broken bendy links. Butt I’m only spitballing here. I think this flawed design results in the car having a tighter left turning radius. Goofy as hell. :D

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Re: Why asymetric steering bellcranks?

Post by RCveteran »

I think Gil was drunk when he sketched it out and no one noticed. Good a theory as any. :D :D

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Re: Why asymetric steering bellcranks?

Post by ChisaiKuso »

Thank you for asking the question, Lonestar. I have always wondered this myself.
Something clever goes here...

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Re: Why asymetric steering bellcranks?

Post by mytimac »

From the man himself.

"The JRX2 originally only had a flexible steering arm as a servo saver (not such a great idea). I wanted it to be as long as possible to reduce the strain (more travel) when hit. Since the arms were offset only one could be that long. I would do many things differently in retrospect! I was at the beginning of my learning curve at that time."
http://oldrc.com - Find parts for older Losi, Associated, Tamiya and others.
http://vintagelosi.com - Manuals and information on older Team Losi models

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