Author Topic: Twin pull cable steering on bikes  (Read 11824 times)

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Offline Jon

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Re: Twin pull cable steering on bikes
« Reply #15 on: September 07, 2012, 02:13:27 PM »
+1 on what Woody said.

I have seen the analysis Woody mentioned, very thorough including a proper cyclical loading test of the cables.
This analysis and rule change request was not done post running the bike.
I am fortunate that someone has had the same problem I want to avoid and has done the work in front of me.
It doesn't mean I can just use some pushbike gearchange cables and I'll pass tech.
There is a process and it has and will be followed.
jon
Underhouse Engineering
Luck = Opportunity + Preparation^3

Offline rouse

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Re: Twin pull cable steering on bikes
« Reply #16 on: February 25, 2013, 07:37:14 PM »
I know I'm very late finding this thread, but This is what I ran into while designing a HCS bike.

I looked at several different methods for setting up the steering and the method that always had the least safety and drive-ability problems was Pull-Pull cables.

As I looked closely at the rule book only Sec. 7.I.5 expressly ruled out cable control, and that was in the side-cars section.

So in order to proceed with the design of the bike I called Tom Evans in order to get his take on this very subject (Pull-Pull cables). He was clear that done properly it would be allowed.

If someone has a better method for steering HCS, I can still take a look at any suggestions, but for now I'm going with (Pull-Pull cables) using top self components, sized to do the job safely.

Rouse
Johnnie Rouse
Bike 4680 P-PP2000 SCTA record 153.325    A-PF3000 182.920
                              Texas Mile 152.518 PP class  186 A-PF Class
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Offline Dean Los Angeles

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Re: Twin pull cable steering on bikes
« Reply #17 on: February 26, 2013, 10:32:54 AM »
Quote
As I looked closely at the rule book only Sec. 7.I.5 expressly ruled out cable control, and that was in the side-cars section.

Streamliner 7.H.14 All steering systems shall be direct, gear or link type.
Well, it used to be Los Angeles . . . 50 miles north of Fresno now.
Just remember . . . It isn't life or death.
It's bigger than life or death! It's RACING.

Offline saltwheels262

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Re: Twin pull cable steering on bikes
« Reply #18 on: February 27, 2013, 09:17:51 AM »
the cable steering system is the reason why the Bub 7 does not run at scta events.
bub '07 - 140.293 a/pg   120" crate street mill  
bub '10 - 158.100  sweetooth gear
lta  7/11 -163.389  7/17/11; 3 run avg.-162.450
ohio -    - 185.076 w/#684      
lta 8/14  - 169.xxx. w/sw2           
'16 -- 0 runs ; 0 events

" it's not as easy as it looks. "
                            - franey  8/2007

Offline rouse

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Re: Twin pull cable steering on bikes
« Reply #19 on: February 27, 2013, 10:29:17 AM »
I am early enough in the design process to choose the best steering for the bike (APS with HCS).

In looking at hard linkage, bump steer is a big issue to overcome. Cable controls solve the bump steer issues, but bring in a whole new set of potential problems that have to be addressed. As in all engineering designs there are always tradeoffs that have to be considered. I have designed and machine the axles and hubs ( out for anodize now ), how to set up the steering controls is still not settled.

There are some European bikes with HCS set up to road race using cable controls, if you read their reviews, steering control doesn't seem to be a problem with cables.

One thing is for sure at this point, the total investment to build this bike is going to be way to much, so not passing tech or having handling problems is "NOT an Option".



Rouse

Johnnie Rouse
Bike 4680 P-PP2000 SCTA record 153.325    A-PF3000 182.920
                              Texas Mile 152.518 PP class  186 A-PF Class
If you love your freedom thank a vet.

Offline Jon

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Re: Twin pull cable steering on bikes
« Reply #20 on: February 27, 2013, 01:23:42 PM »
Contact the motorcycle tech committee with the details of your design in writing and get something back in writing before you proceed.

Cheers
jon


Ps. Any pics of your build?
Underhouse Engineering
Luck = Opportunity + Preparation^3

Offline rouse

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Re: Twin pull cable steering on bikes
« Reply #21 on: February 27, 2013, 06:07:51 PM »
Thanks for the advise Jon, and Woody, I read the report and your right it makes good sense to me.

I have a few parts and pieces so far not many. Besides the hub parts done. I have the engine cases Billet Delkron, Transmission Baker Torque Box, Baker KKK Clutch and FF Primary. I also have some of the materials for the chassis. So you can see this Build is very early on in the process.

I'd post pictures, but I'm not sure how to do that yet. I'll give it a try.
Johnnie Rouse
Bike 4680 P-PP2000 SCTA record 153.325    A-PF3000 182.920
                              Texas Mile 152.518 PP class  186 A-PF Class
If you love your freedom thank a vet.