R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 01-01-2010, 06:20 PM   #16
Tech Elite
 
nitro neil's Avatar
 
Join Date: Aug 2004
Location: zion,il
Posts: 2,179
Trader Rating: 73 (100%+)
Default

I thought this to be intresting. This is a thread from London ontario
http://forums.londonrc.com/showthread.php?t=33844
read post #15
__________________
TLR, SPEKTRUM,HORIZON HOBBIES, JCONCEPTS, Tekin, MIP, ONeill Brothers Racing, Axis RC, Large Scale RC, Boom rc, Team Chase,
nitro neil is offline   Reply With Quote
Old 01-01-2010, 07:02 PM   #17
Tech Master
 
TwoTone's Avatar
 
Join Date: Jun 2008
Location: Maryland
Posts: 1,002
Trader Rating: 12 (100%+)
Default

Btw, since most of you seem new to VTA, the idea to slow the class down isn't something new or recent.

Take a look at this a year ago http://www.rctech.net/forum/electric...ec-racing.html

So again, if you've been following VTA, you'd know something was going to change.

Spdjunky, you should get your own website and your own name for your series since your the spearhead of this movement.
TwoTone is offline   Reply With Quote
Old 01-01-2010, 07:03 PM   #18
Tech Addict
 
gacjr0's Avatar
 
Join Date: Dec 2002
Posts: 725
Trader Rating: 15 (100%+)
Default

Check your gear chart.

What you say is not even true if you limit your view to just a normal pinion and spur and adding a tooth.

When were talking about 3.6 FDR things are the same.

I'm not saying this set of gears will fit in my Xray T2R, I'm using it as an example though.

84/20*2.17=9.114
84/21*2.17=8.68
a difference of 0.434 for that 1 tooth change

72/40*2.17=3.906
72/41*2.17=3.811
a difference of 0.095 for that 1 tooth change

72/42*2.17=3.72
72/43*2.17=3.633
.087 change

and so on
__________________
-Dangerous with power tools-
gacjr0 is offline   Reply With Quote
Old 01-01-2010, 07:34 PM   #19
Tech Champion
 
Scottrik's Avatar
 
Join Date: Sep 2004
Location: Billings, MT
Posts: 6,212
Trader Rating: 245 (100%+)
Default

Quote:
Originally Posted by gacjr0 View Post
Check your gear chart.

What you say is not even true if you limit your view to just a normal pinion and spur and adding a tooth.

When were talking about 3.6 FDR things are the same.

I'm not saying this set of gears will fit in my Xray T2R, I'm using it as an example though.

84/20*2.17=9.114
84/21*2.17=8.68
a difference of 0.434 for that 1 tooth change

72/40*2.17=3.906
72/41*2.17=3.811
a difference of 0.095 for that 1 tooth change

72/42*2.17=3.72
72/43*2.17=3.633
.087 change

and so on
You will find that you are skewing your results by being at such a huge difference in FDR for your comparison. Yes, when you are looking at pinions around 20-ish teeth vs. 40-ish teeth the change is dramatically large by comparison. However if you look at combinations that are in the same FDR neighborhood (what you would realistically be looking at were you contemplating making a change on your car) it is easy to demonstrate that the other posters are, in fact, correct. Using your original 84T spur but with pinions that yield the same FDR's as you're using in your smaller spur examples:

84/49*2.17=3.72
84/50*2.17=3.65

Which yields a difference of 0.07 for that 1 tooth change that is, as described by the other posters, somewhat less than the 1 pinion tooth change on the smaller spurs.

Quote:
Originally Posted by gacjr0
Dangerous with power tools
Kinda hazardous with algebra too

I kid--yours was an easy mistake to make...but the math teacher in me spotted where the problem was right off.
__________________
Congressmen should wear uniforms like NASCAR drivers so we can identify their corporate sponsors.

THE REVOLUTION WILL NOT BE TELEVISED -Gil Scott-Heron (1949-2011)
Scottrik is offline   Reply With Quote
Old 01-01-2010, 07:41 PM   #20
Tech Master
 
Join Date: Jan 2005
Posts: 1,306
Default

Umm, what happened to American open wheel racing when the IRL split with CART?
outlandr91 is offline   Reply With Quote
Old 01-01-2010, 09:01 PM   #21
Tech Regular
 
xevias's Avatar
 
Join Date: Feb 2006
Location: Shanghai, PRC
Posts: 348
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by gacjr0 View Post
I think Jesus already smacked down your gearing issue on the OGVTA thread.
Little bit of house cleaning here...

I'm all for logical discussions and joking around too. Several people have posted responces to Scottrik's harshness in the VTA thread. One even humorously called him VTA Jesus because of this. I joked by called him VTA Ceaser. He has some good points, but sometimes his posts can be hard to read due to his lack of political fortitude.

Robk (VTA rule maker) doesn't deserve any insults. He works hard, and along with his experience, has determined a course of action.

Thought this communication correction was necessary to make sure this joke didn't run out of control.

If anything, Robk is VTA Shogun.

Now have fun, you VTA peasants...
xevias is offline   Reply With Quote
Old 01-01-2010, 09:40 PM   #22
Tech Addict
 
gacjr0's Avatar
 
Join Date: Dec 2002
Posts: 725
Trader Rating: 15 (100%+)
Default

Quote:
Originally Posted by Spdjunky View Post
Gearing isn't a total deal breaker either way. Gearing choices do get smaller when you run a smaller spur and larger pinion though. One tooth change will be a lot.
Quote:
84/49*2.17=3.72
84/50*2.17=3.65

Which yields a difference of 0.07 for that 1 tooth change
So the original assertion that one pinion tooth change at high FDR will be a lot is done for.
__________________
-Dangerous with power tools-
gacjr0 is offline   Reply With Quote
Old 01-01-2010, 09:42 PM   #23
Tech Addict
 
gacjr0's Avatar
 
Join Date: Dec 2002
Posts: 725
Trader Rating: 15 (100%+)
Default

Quote:
Originally Posted by xevias View Post
One even humorously called him VTA Jesus because of this. I joked by called him VTA Ceaser. Now have fun, you VTA peasants...
In the spirit of the thread, I should let you all know I am kidding. No serious offense meant, just joshing.
__________________
-Dangerous with power tools-
gacjr0 is offline   Reply With Quote
Old 01-01-2010, 10:12 PM   #24
Tech Champion
 
Scottrik's Avatar
 
Join Date: Sep 2004
Location: Billings, MT
Posts: 6,212
Trader Rating: 245 (100%+)
Default

Oops...double post.
__________________
Congressmen should wear uniforms like NASCAR drivers so we can identify their corporate sponsors.

THE REVOLUTION WILL NOT BE TELEVISED -Gil Scott-Heron (1949-2011)
Scottrik is offline   Reply With Quote
Old 01-01-2010, 10:14 PM   #25
Tech Champion
 
Scottrik's Avatar
 
Join Date: Sep 2004
Location: Billings, MT
Posts: 6,212
Trader Rating: 245 (100%+)
Default

Quote:
Originally Posted by gacjr0 View Post
So the original assertion that one pinion tooth change at high FDR will be a lot is done for.
Well, not really if you think about it.

In that similar range of FDR a one tooth change against the smaller spur results in, roughly, a 35% greater change than that one tooth against the larger spur (.07 vs .095 change). That's a significant difference, at least in a theoretical sense. You do, technically, have less fine adjustment capability using smaller spur gears which is the point (I believe) that spdjunky and vrracer were trying to make.

Realistically, is it much of a difference? I'd agree probably not. Likely more critical in things like 1/12 where you're trying to compensate for tire wear with gear changes, and where gear changes tend to make a bigger difference. In the VTA cars, and I may be "at sea" here, but I tend to find my general ratio and leave it there so changes (regardless whether 1 tooth is big or small) really become moot.
__________________
Congressmen should wear uniforms like NASCAR drivers so we can identify their corporate sponsors.

THE REVOLUTION WILL NOT BE TELEVISED -Gil Scott-Heron (1949-2011)
Scottrik is offline   Reply With Quote
Old 01-02-2010, 12:13 AM   #26
Tech Fanatic
 
Join Date: Oct 2005
Location: Illinois
Posts: 906
Trader Rating: 16 (100%+)
Default

Quote:
Originally Posted by smokefan View Post
Here's an idea for ya if you like the 21.5 and the esc and the speeds instead of ripping off the USVTA start a class called RCST 21.5 motors and run modern street tuner cars like the Grand Am series does in the ST class with a spec tire.
It's slower than RCGT but faster than the "New VTA" you can run both rcgt and rcst cars together just like the big boys do.
Just something for you to think about.
Not a bad idea, but this was more of a 'if it aint broke, don't fix it' thread. If a majority of people feel thats the way it should go, then fine.

This should be a place where people can voice their opinions without being shot down. This class should remain close to the other VTA class so people can move up when they are ready without buying all new gear.
__________________
www.TheRcShack.com
www.TeamXray.com
Spdjunky is offline   Reply With Quote
Old 01-02-2010, 12:16 AM   #27
Tech Fanatic
 
Join Date: Oct 2005
Location: Illinois
Posts: 906
Trader Rating: 16 (100%+)
Default

Point was made in a later post .. nm this post
__________________
www.TheRcShack.com
www.TeamXray.com
Spdjunky is offline   Reply With Quote
Old 01-02-2010, 12:18 AM   #28
Tech Fanatic
 
Join Date: Oct 2005
Location: Illinois
Posts: 906
Trader Rating: 16 (100%+)
Default

Quote:
Originally Posted by nitro neil View Post
I thought this to be intresting. This is a thread from London ontario
http://forums.londonrc.com/showthread.php?t=33844
read post #15
LOL .. that does about sum it up doesn't it!!
__________________
www.TheRcShack.com
www.TeamXray.com
Spdjunky is offline   Reply With Quote
Old 01-02-2010, 12:33 AM   #29
Tech Fanatic
 
Join Date: Oct 2005
Location: Illinois
Posts: 906
Trader Rating: 16 (100%+)
Default

Quote:
Originally Posted by outlandr91 View Post
Umm, what happened to American open wheel racing when the IRL split with CART?
and to TwoTone:

a website is doable, but the point is - I really like VTA. I like Rob also. I also don't want to see an outright competition with the VTA.

There are changes being suggested that it seems a majority of the people don't agree with. So rather than loose those people (like in the IRL situation) make one of the classes a 'Sportsman' or 'Pro' class - Just an idea.

As I stated in the earlier posts, everyone says they want the class to thrive. If that is true, a motor class should be allowed that runs an open motor so that HPI, Losi, or Associated could offer an RTR on an older platform.

Losi is making the drift out of their antique XXX-S, it wouldn't take diddly to revamp it into a VTA. But I doubt it will run a 3.** FDR
__________________
www.TheRcShack.com
www.TeamXray.com
Spdjunky is offline   Reply With Quote
Old 01-02-2010, 07:32 AM   #30
Tech Regular
 
Lenman73's Avatar
 
Join Date: Feb 2008
Posts: 457
Trader Rating: 4 (100%+)
Default

This is a concern of mine also, I run a xxx-s and had fun getting to the 4.2 fdr although it was possible. If I have to buy a new car because of the new rules and I can't get the ratio I am going to be angry, and no one will like me when I'm angry
Lenman73 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
The Roadrunners RC Club V.2 Fran California Racing 8324 12-06-2017 05:07 AM
Oshkosh Racing HALFFAST Wisconsin & Illinois Racing 7667 07-15-2017 07:46 PM
U.S. Vintage Trans-Am Racing squarehead Electric On-Road 14187 03-21-2012 02:43 PM
FSEARA TRANS AM - "VINTAGE CLASS" TWEAKS AND SUGGESTIONS Tim Kowal Florida Racing 118 03-24-2008 11:01 AM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 12:42 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net