R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 04-13-2004, 01:44 PM   #5821
Tech Elite
 
HarshGuy's Avatar
 
Join Date: Aug 2001
Location: Roseville, CA
Posts: 3,379
Trader Rating: 6 (100%+)
Default

Any words of advice for someone that just picked up an Mi2 kit? i.e. building tips and techniques?
__________________
http://www.arroyoc.com
http://www.gearchart.com
http://www.weracemountainbikes.com
HarshGuy is offline   Reply With Quote
Old 04-13-2004, 02:18 PM   #5822
Tech Champion
 
AdrianM's Avatar
 
Join Date: Aug 2001
Location: Tampa, FL
Posts: 5,914
Trader Rating: 4 (100%+)
Default

Olev - It is true that the less the belt bends the more efficient it is but the primary benefit is the lower belt speed.

The car with the lower internal drive ratio's belt has to rotate less to turn the wheels the same amount. There are 2 main benefits of this:

1. Lower belt speeds reduce frictional losses from tooth engagement.

2. Lower belt speeds let the car go faster before the onset of negative belt harmonics (out of control Belt flapping). This was never an issue in Schumacher as we have always been aware of this problem and have always taken measure to eliminate the problem from our cars. However Corally C4.1's, Tamiya 414X and Early Xrays all had huge problem with this when running Mod motors on big tracks. Interestingly enought...shaft are are not immune to this. Negative shaft harmonics are why no one runs carbon shafts on their TC3's anymore.

FYI, Sedan design is serious business. They are not sketched out at bars on cocktail napkins (thats how Mountain Bikes are designed...lol!). Schu UK has former IFMAR WC Phil Booth as the head of R&D, Engineers and CAD/CAM/CNC experts and racers with a combined racing experience of 40 years in the US office alone. Cecil Schumacher was a transmission engineer for an F1 team for 20 years before he got into R/C.

We also have specialized engineers that consult on certain projects. Like the Gates Belt engineers that consulted on the Mission, R12 and Fusion 21 drive trains.
__________________
Adrian Martinez
What I run: Schumacher Mi5/Associated RC10R5.1/Associated RC12R5.2/Futaba/HobbyWing/Team EA Motorsports/BSR Racing
Where I run: Florida Indoor R/C Complex/Thunder Racing/Florida On Road State Series
AdrianM is offline   Reply With Quote
Old 04-13-2004, 02:22 PM   #5823
Tech Champion
 
AdrianM's Avatar
 
Join Date: Aug 2001
Location: Tampa, FL
Posts: 5,914
Trader Rating: 4 (100%+)
Default

HarshGuy - As with any car be sure the suspension is completely free before you mount your shocks. Also dont overtighten the torx screws. If you over do it you can crush the chassis and top deck carbon. Snug is good enough.
__________________
Adrian Martinez
What I run: Schumacher Mi5/Associated RC10R5.1/Associated RC12R5.2/Futaba/HobbyWing/Team EA Motorsports/BSR Racing
Where I run: Florida Indoor R/C Complex/Thunder Racing/Florida On Road State Series
AdrianM is offline   Reply With Quote
Old 04-13-2004, 04:45 PM   #5824
Tech Master
 
scott_g's Avatar
 
Join Date: Jul 2003
Location: Brisbane, Aus
Posts: 1,786
Trader Rating: 9 (100%+)
Send a message via MSN to scott_g Send a message via Skype™ to scott_g
Default

Adrian, can you take a moment to explain why the belt speed differs depending on the pulley size?

Surely for any given car speed, the belt speed over the diff pulleys (and therefore overall belt speed/revolutions) must be identical. I would have thought the only way to truly vary belt speed would be to change diff pulley size.

As Olev mentioned, it woudl be the layshaft pulley speed that would vary - turning faster with the smaller pulley and slower with the larger pulley.

I would think there could be an effect of "accelerating" the mass of the belt from a standstill or slow speed, but ultimately for any given car speed, the belt speed must be the same either way.

I'm quite open to you pointing out how wrong this understanding is - I'm certainly no mechanical engineer.
__________________
schumacher, speedpassion and more plus race blog at www.actionrc.com.au
twittering @ scottyg_rc
scott_g is offline   Reply With Quote
Old 04-13-2004, 05:02 PM   #5825
Tech Elite
 
HarshGuy's Avatar
 
Join Date: Aug 2001
Location: Roseville, CA
Posts: 3,379
Trader Rating: 6 (100%+)
Default

I have a "full complment" of Losi springs, the setup that I'm looking at calls for AE Blue & AE Silver springs, does anyone know what that would "equal" in Losi springs?
__________________
http://www.arroyoc.com
http://www.gearchart.com
http://www.weracemountainbikes.com
HarshGuy is offline   Reply With Quote
Old 04-13-2004, 05:43 PM   #5826
Tech Master
 
=MisFitz= NuKe's Avatar
 
Join Date: Apr 2003
Posts: 1,058
Send a message via AIM to =MisFitz= NuKe Send a message via Yahoo to =MisFitz= NuKe
Default

well, if I remember correctly, silvers equal 12.5 or 15 lbs and blues equal like 15 or 17
soo....
=MisFitz= NuKe is offline   Reply With Quote
Old 04-13-2004, 06:23 PM   #5827
Tech Initiate
 
Join Date: Apr 2004
Posts: 28
Default

Blue average rating16.5-on package rating17lbs
Silver average rating13.8-on package rating14.5lbs
rcracing1973 is offline   Reply With Quote
Old 04-13-2004, 07:17 PM   #5828
Tech Fanatic
 
King-G's Avatar
 
Join Date: Sep 2001
Location: Melbourne Australia
Posts: 837
Send a message via ICQ to King-G
Default

Besercoe..congrats on your choice of sedan!..

strange issue you mentioned with on power aggressivness, If anything, I have found the Mi2 to be very sedate to drive...like a broader limit..whereas the Mission always felt nervous...the Mi2 feels very controlled..

check over your droop settings, make sure your shock lengths are ok (could be a concern using foams)..for rubber/ashpalt I use 64.5 front length, and 65.8 rear length...this allows maximum uptravel, and adequate extension...

some people are using tamiya shocks as they provide further travel / droop.

Schumacher is in the process of designing all new shocks...(this is why team drivers were spotted using other brands of shocks in testing) (they will be mint)..

fire me a message if you have any q's..
King-G is offline   Reply With Quote
Old 04-13-2004, 07:21 PM   #5829
Tech Champion
 
STLNLST's Avatar
 
Join Date: Sep 2001
Location: Sacramento
Posts: 8,939
Trader Rating: 21 (100%+)
Default

losi green is 17 not their blue.

harsh- get my number from billy or check your rcracing email address. Mo and I will hook you up tonight.
__________________
REMEMBER THE GOOD OLE DAYS..........THEY'RE NEVER COMING BACK SO WE'RE STUCK WITH THE MESS IN FRONT OF US!!!!
STLNLST is offline   Reply With Quote
Old 04-13-2004, 07:23 PM   #5830
R/C Tech Founder
R/C Tech Charter Subscriber
 
Join Date: Aug 2001
Location: Del Mar, CA, USA
Posts: 7,063
Default

I just built a Mi2 the other day and although it all went smoothly and the car looks great, the drivetrain concerned me. It looked like the main belt was getting severely pinched at the rear diff between the edge of the diff and that spacer ring that is on there. Is that a big concern, or is it something that will work its way in after running a bit? I'm fairly certain I didn't do anything wrong building it...
__________________
Visit my store: www.ampdraw.com
futureal is offline   Reply With Quote
Old 04-13-2004, 08:05 PM   #5831
mo
Tech Master
 
mo's Avatar
 
Join Date: Aug 2001
Location: Sacramento, CA
Posts: 1,359
Trader Rating: 7 (100%+)
Default

futureal, the spacer is not fixed on the gear, you can just slide it over a bit so it is not touching the belts.
__________________
TLR, Spektrum, Tekin, SMC, MO-GRIP, www.factory-rc.com https://www.shapeways.com/shops/MPP
mo is offline   Reply With Quote
Old 04-13-2004, 08:20 PM   #5832
Tech Fanatic
 
Join Date: Apr 2004
Location: California
Posts: 828
Trader Rating: 10 (100%+)
Default

are you mo dento
HEWITT is offline   Reply With Quote
Old 04-13-2004, 08:22 PM   #5833
mo
Tech Master
 
mo's Avatar
 
Join Date: Aug 2001
Location: Sacramento, CA
Posts: 1,359
Trader Rating: 7 (100%+)
Default

Nope, My name is Jason.
__________________
TLR, Spektrum, Tekin, SMC, MO-GRIP, www.factory-rc.com https://www.shapeways.com/shops/MPP
mo is offline   Reply With Quote
Old 04-13-2004, 08:26 PM   #5834
Tech Elite
 
HarshGuy's Avatar
 
Join Date: Aug 2001
Location: Roseville, CA
Posts: 3,379
Trader Rating: 6 (100%+)
Default

STLNLST ...email me at [email protected] I never check the rcracing.com email anymore (to many "you to can be a real man" emails ) ...cars built up to the mounting the shocks so would love to get a hold of the missing piece!!
__________________
http://www.arroyoc.com
http://www.gearchart.com
http://www.weracemountainbikes.com
HarshGuy is offline   Reply With Quote
Old 04-13-2004, 08:34 PM   #5835
mo
Tech Master
 
mo's Avatar
 
Join Date: Aug 2001
Location: Sacramento, CA
Posts: 1,359
Trader Rating: 7 (100%+)
Default

YGM
__________________
TLR, Spektrum, Tekin, SMC, MO-GRIP, www.factory-rc.com https://www.shapeways.com/shops/MPP
mo is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Corner Dots anyone? RCGaryK Electric On-Road 19 07-03-2006 11:12 PM
On the Corner RC-HPI R/C Photography 0 08-02-2005 10:53 PM
Snowbirds Around the Corner scarecrow Florida Racing 20 01-27-2005 10:43 AM
1/12th Corner GT Racer Singapore R/C Racers 26 03-04-2004 06:59 AM
Shumacher Corner in Aus jamesbaxter_81 Australian Racing 6 01-08-2004 02:36 PM



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 03:47 PM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net