R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 09-03-2010, 05:08 AM   #16
Tech Adept
 
Missle's Avatar
 
Join Date: May 2010
Location: Cinci, OH
Posts: 112
Default

You can still gain from using a 2 speed but it really depends on how and where you plan to run. IF you have the time patients and resource, I think the two speed can help cause you can really over gear second (for more top end) without continuously overloading your motor/esc/bats. For instance, with a single speed, say you get the tallest gear that allows 10 min of fast racing with your electronics running ~ 150 deg. Well you can take and use a gear with 2-5 more teeth for your second and use 1-2 teeth smaller for first gear.
As for the brakes, I don't like to use the motor as this uses energy and therefor adds heat to the eletronics. The bad side is the added weight but for my 1/8 scale, doesn't really matter. Just use a Y or mix in on your third channel.
Missle is offline   Reply With Quote
Old 09-03-2010, 10:23 AM   #17
Tech Champion
 
Join Date: Feb 2003
Location: Sydney, Australia
Posts: 5,310
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by pakk View Post
isn't that what I said?
Sorry I was just emphasizing what you said... that it wouldn't be better...

Quote:
Originally Posted by snail run View Post
so your trying to tell me it would not work better?
Yes... Single speed is all you need. I have seen a few 8th scale setups up and running and the grunt and top end destroys a nitro car by so much its not funny, all setups where single speed. The advantage lies in the fact the you can add more batteries and up the "octane" real easy with the right motor and ESC. A simple 2s setup will match or better any RTR nitro setup, 4s will beat a full race nitro motor, and 6s is just stupid fast. Google 8th scale electric and check it out yourself like this one...

+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.
__________________
Blade: Andro Treiber H 79g AN
FH: Donic Bluefire M3 Max Blk
BH: Donic Bluefire M2 Max Red
Powered by Falco
Dragonfire is offline   Reply With Quote
Old 09-04-2010, 11:47 PM   #18
Tech Regular
 
Join Date: Apr 2007
Posts: 476
Trader Rating: 7 (100%+)
Default

Quote:
Originally Posted by snail run View Post
so your trying to tell me it would not work better?
Here is a good litmus test before trying things like this. Think of it this way. If a 2 speed trans made a brushless car run faster or better in any way at least ONE manufacture would have released a car with a two speed trans/brushless combo. How many cars are available set up like this? Zero. That to me says it's not all you think it will be, or just flat out woun't work at all.
MonkeyFist is offline   Reply With Quote
Old 09-05-2010, 06:55 AM   #19
Tech Adept
 
Missle's Avatar
 
Join Date: May 2010
Location: Cinci, OH
Posts: 112
Default

Quote:
Originally Posted by MonkeyFist View Post
Here is a good litmus test before trying things like this. Think of it this way. If a 2 speed trans made a brushless car run faster or better in any way at least ONE manufacture would have released a car with a two speed trans/brushless combo. How many cars are available set up like this? Zero. That to me says it's not all you think it will be, or just flat out woun't work at all.
I believe that's the same argument us nitro folks used to say about electric motors alltogether; that is until the first couple of company's started making electric RTR kits

Again, a 2 speed is not needed but can be done if the person has the know-how and the extra supplies. I personally wouldn't do it for a dirt/bashing setup unless there were some really long straights because you generally aren't doing lots of full speed sections. For on-road, I actually have come to perfer the two speed just cause my local track has several top speed sections. Initially, in order to increase my speed in these top speed sections I would simply increase pinion size. The problem is that during the other 80% of the track, I was creating a lot of heat. In order to increase my top end on the long straights, AS WELL as decrease energy expenditure during the other 80%, I simply switched to an extreme second gear with a smaller first gear. But then again, with today's ESC's, you can almost do the same thing by adjusting the throttle curves and so on.
Missle is offline   Reply With Quote
Old 09-05-2010, 07:45 AM   #20
Tech Champion
 
Join Date: Feb 2003
Location: Sydney, Australia
Posts: 5,310
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by Missle View Post
I believe that's the same argument us nitro folks used to say about electric motors alltogether; that is until the first couple of company's started making electric RTR kits

Again, a 2 speed is not needed but can be done if the person has the know-how and the extra supplies. I personally wouldn't do it for a dirt/bashing setup unless there were some really long straights because you generally aren't doing lots of full speed sections. For on-road, I actually have come to perfer the two speed just cause my local track has several top speed sections. Initially, in order to increase my speed in these top speed sections I would simply increase pinion size. The problem is that during the other 80% of the track, I was creating a lot of heat. In order to increase my top end on the long straights, AS WELL as decrease energy expenditure during the other 80%, I simply switched to an extreme second gear with a smaller first gear. But then again, with today's ESC's, you can almost do the same thing by adjusting the throttle curves and so on.
I don't think there same insane power increases you see in racing brushless systems can be applied to a hi voltage conversion, but it isn't necessary. You put 4s lipo in a decent chassis and you will have massive power straight away. 6s and you will need very good throttle control to be able to run up and down the street without doing backflips and circle work. Why add something that will add a week point into the system?
__________________
Blade: Andro Treiber H 79g AN
FH: Donic Bluefire M3 Max Blk
BH: Donic Bluefire M2 Max Red
Powered by Falco
Dragonfire is offline   Reply With Quote
Old 09-05-2010, 11:15 AM   #21
Tech Initiate
 
Join Date: Mar 2007
Location: antigua
Posts: 32
Default

i see where ya'll coming from, i already built it and test it and to tell the truth my trinity T-spec looks like it runs better. think i'm gonna try it single speed and see how it run
snail run is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
HPI Rally Car w/ 2 Speed. Yes, 2 Speed OTHS Electric On-Road 13 12-16-2007 03:26 AM
2 speed shakzool Electric On-Road 19 08-29-2006 05:15 AM
Electric TC3 2 Speed DraKhen99 Electric On-Road 30 07-22-2003 08:37 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 04:17 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