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Old 04-03-2010, 02:04 PM   #18886
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Originally Posted by tha Beast View Post
im thinking of ordering the newer version of the HBX chassis(exotek) but i wanted to if i should just stick with the one i already have(the first version) i run on asphalt with a 5.5turn motor. thanks in advance
I have both and I've found that the first version has a stiffer chassis. I know that there are a few extra cut outs in the second version but I'm really surprised at the difference in flex between the two. For now I'm sticking with the second version and I'm determined to make it work. I run 17.5 rubber carpet.
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Old 04-03-2010, 10:08 PM   #18887
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I never tried the first version. I have the second version and love it. It's made my life a whole lot easier dialing in my car with lipo. Balance is spot on, and it seems like the window in which my car works is larger now. So for me, thats pretty awesome. I don't have to sit and rack my brain on setup throughout the day. Thats just my experience though

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Old 04-03-2010, 10:47 PM   #18888
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what do you run Korey???
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Old 04-03-2010, 10:49 PM   #18889
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Setupwise? I think I posted the setup sheet a few pages back for carpet. I'm running Exotek's newer style cyclone chassis, but fitted with steel cups. Works out really well.

-Korey
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Old 04-03-2010, 10:55 PM   #18890
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no sorry i ment motor. i wanna get the new version i just dont wanna tweak it on the first day i have an LRP 12X(i think thats what its called ) and it has ALOT of torque plus im running on asphalt and im very aggressive
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Old 04-04-2010, 11:54 AM   #18891
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Anyone know when the new prototype will be launch? no info on the official website. I wonder why the Cyclone TC-D also was not updated but available in Singapore & Malaysia.
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Old 04-04-2010, 11:57 AM   #18892
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no data ,
they said test only !
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Old 04-05-2010, 02:26 AM   #18893
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Quote:
Originally Posted by Phil C View Post
...

Obviously unless you move the upper shock position so that the angle of the shock stays the same you will also feel the effect this has....

More angle on the shock makes the suspension 'regressive', meaning it gets softer the further it travels

Less angle on the shock makes it more linear, so compared to a more angled shock, it will feel stiffer as the car rolls.


Hope this helps.
Hi Phil,

(1) I have a query regarding your comments about shock angle (as opposed to shock position on bottom arm).

My query is based on the theory at the site below (which I have found generally quite useful).
http://www.rccar.dk/artikler-mainmen...-handling.html
"R/C Car Handling - An Introduction To Vehicle Dynamics."

In particular, the chapter on "Suspension", section 2.8 Shock mounting locations.
http://www.rccar.dk/artikler-mainmen...g.html?start=2
It seemed (?) to all make sense (has pics and text).

Anyway, the formulae of interest is:
---- Wheel rate = spring rate * (D1/D2) * sin (a)

a = shock angle in degrees
a = 90 degs would be an upright shock (ie: sin a = 1)
a = 0 degs would be a shock layed horizontal - not useful (ie: sin a = 0)
a = 45 degs (say) would be a shock layed down half way between the two extremes (ie: sin 45 = 0.707).

As the suspension is compressed:
-- the angle (a) gets LARGER (* this is the key observation *)
-- sin (a) gets LARGER
-- WheelRate gets LARGER
-- effective spring rate gets LARGER (harder)

(2) Therefore,
-- more angle on the shock, starts out SOFTER
-- but gets HARDER as the suspension is compressed

(3) On the surface this seems to be at odds with your comments.
What am I missing here ??

Sorry about the equations (my head hurts)
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Old 04-05-2010, 03:27 AM   #18894
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Quote:
Originally Posted by cosmo1974 View Post
Hi Phil,

(1) I have a query regarding your comments about shock angle (as opposed to shock position on bottom arm).

My query is based on the theory at the site below (which I have found generally quite useful).
http://www.rccar.dk/artikler-mainmen...-handling.html
"R/C Car Handling - An Introduction To Vehicle Dynamics."

In particular, the chapter on "Suspension", section 2.8 Shock mounting locations.
http://www.rccar.dk/artikler-mainmen...g.html?start=2
It seemed (?) to all make sense (has pics and text).

Anyway, the formulae of interest is:
---- Wheel rate = spring rate * (D1/D2) * sin (a)

a = shock angle in degrees
a = 90 degs would be an upright shock (ie: sin a = 1)
a = 0 degs would be a shock layed horizontal - not useful (ie: sin a = 0)
a = 45 degs (say) would be a shock layed down half way between the two extremes (ie: sin 45 = 0.707).

As the suspension is compressed:
-- the angle (a) gets LARGER (* this is the key observation *)
-- sin (a) gets LARGER
-- WheelRate gets LARGER
-- effective spring rate gets LARGER (harder)

(2) Therefore,
-- more angle on the shock, starts out SOFTER
-- but gets HARDER as the suspension is compressed

(3) On the surface this seems to be at odds with your comments.
What am I missing here ??

Sorry about the equations (my head hurts)
You are correct about the angle of the shock theory, I wasn't thinking straight when writing my comment about this obviously!

I'm currently studying for a BEng Motorsport Engineering Degree and have been looking at different types of suspension recently (namely single seater/pushrod) which has obviously put me somewhat out of practice with what we use in RC touring cars! :S

Thanks for pointing out my mistake
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Old 04-05-2010, 03:37 AM   #18895
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Quote:
Originally Posted by Phil C View Post
You are correct about the angle of the shock theory, I wasn't thinking straight when writing my comment about this obviously!

I'm currently studying for a BEng Motorsport Engineering Degree and have been looking at different types of suspension recently (namely single seater/pushrod) which has obviously put me somewhat out of practice with what we use in RC touring cars! :S

Thanks for pointing out my mistake
Thats a relief, as my head could not stand any more thinking.
Enjoy your studies.

Less Thinking - More Drinking
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Old 04-05-2010, 02:46 PM   #18896
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Questions?? rear track width

Hi,

When NARROWING the rear track width (thin hexes), the Hudy setup book indicates following:
Increases grip at corner exit (* I'm assuming this means rear grip *)
Increases high-speed understeer.
Increases front grip in hairpin turns.

I think Korey mentioned the same thing about Hara's RROC 2008 setup (ie: thin rear hexes, 72044, for more rear end grip).
REF: Hot Bodies Cyclone

If D2 gets less (and nothing else is changed), Wheel Rate gets larger:
---- Wheel rate = spring rate * (D1/D2) * sin (a)
Not sure about roll centre change.

Why does narrowing the rear track width INCREASE grip at corner exit ??

Thanks in advance
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Last edited by cosmo1974; 04-06-2010 at 04:19 AM. Reason: Added REF to Korey's comment about Hara RROC 2008 setup.
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Old 04-05-2010, 06:05 PM   #18897
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Quote:
Originally Posted by cosmo1974 View Post
Hi,

When NARROWING the rear track width (thin hexes), the Hudy setup book indicates following:
Increases grip at corner exit (* I'm assuming this means rear grip *)
Increases high-speed understeer.
Increases front grip in hairpin turns.

I think Korey mentioned the same thing about Hara's RROC 2008 setup (ie: thin rear hexes, 72044, for more rear end grip).

If D2 gets less (and nothing else is changed), Wheel Rate gets larger:
---- Wheel rate = spring rate * (D1/D2) * sin (a)
Not sure about roll centre change.

Why does narrowing the rear track width INCREASE grip at corner exit ??

Thanks in advance



... my guess is that the narrower end of the chassis rolls more ..... (?)
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Old 04-06-2010, 04:03 AM   #18898
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so, I can never get my pro-spec diff loose enough without slipping the spur. How tight do you usually have your diff.
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Old 04-06-2010, 04:32 PM   #18899
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A gear ratio is a gear ratio regardless of the relative size of the pinion/spur,, do u get the same effect if they create the same ratio?? Im curious if a smaller pinion is still easier and quicker to turn over than a larger pinion.

I ask because i was using 78/28, and now im moving to 87/32 which are fairly close to each other. Im convinced the 78/28 seemed faster and on edge towards ordering a 78t.
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Old 04-07-2010, 01:21 AM   #18900
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Quote:
Originally Posted by tha Beast View Post
no sorry i ment motor. i wanna get the new version i just dont wanna tweak it on the first day i have an LRP 12X(i think thats what its called ) and it has ALOT of torque plus im running on asphalt and im very aggressive
For modified I run a LRP X12 5.5 or 4.5. For stock, I run whatever I have in my box. Currently I have a Trinity Duo 17.5 in my car. I also run Orca 17.5 motors, and LRP as well.

-Korey
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