R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 04-01-2007, 07:26 AM   #1
Tech Addict
 
nudge2325's Avatar
 
Join Date: Jun 2003
Location: Brisbane QLD
Posts: 729
Trader Rating: 13 (100%+)
Default Mid Motor XXX BK2

I have just completed modifying a Losi BK2 to convert it into a Mid Mounted Motor version.

I have read in a couple of different forums that doing a Mid Motor Conversion changes the way the car handles and reacts and makes it similar in handling to a 4wd so i thought why not see if I can firstly make the conversion work and secondly make it handle.

I have completed the conversion today and gave the car a run out at Ipswich this afternoon just as a shakedown run to make sure it wold stay together ( which thankfully it did).

I will have the car at the Natonals at Maitland and hopefully i will be running it during the event in 2wd stock.

If anyine wants to have a look at it they will be most welcome to see the conversion work involved in changing it.

Click the links for some pics

Adrian

http://www.rctech.net/forum/attachme...hmentid=218183

http://www.rctech.net/forum/attachme...hmentid=218184

http://www.rctech.net/forum/attachme...hmentid=218185
__________________
Club Secretary BRCCC. www.wynnumrc.org.au
My Rides:
2016 Destiny RX10s For Me, 2015 Yokomo BD7 Black For my Son, 2015 Yokomo BD7 Black For my Daughter
Shelf Queens Losi XX4 WE, Yokomo YZ10 (First Proper Race Car).
nudge2325 is offline   Reply With Quote
Old 04-01-2007, 03:57 PM   #2
Tech Elite
 
MadRacer's Avatar
R/C Tech Elite Subscriber
 
Join Date: Aug 2005
Location: Australia
Posts: 2,819
Trader Rating: 33 (100%+)
Default

I saw a couple while i was racing in England. They said it was good for high grip tracks (grass, astro turf) but not too good for dirt. How did it go??
__________________
Boondal vintage Tamiya's

https://www.youtube.com/watch?v=vtmCddStNyM

QLD State Titles winner in 6S EB CAT
MadRacer is offline   Reply With Quote
Old 04-01-2007, 08:40 PM   #3
Tech Fanatic
 
Join Date: Jun 2006
Posts: 872
Trader Rating: 35 (100%+)
Default

I would think it would steer less than it did before since the CG is moved forward. Do you have a picture of the whole car?
__________________
High Desert Raceplace, Grand Jct CO, Sanwa Exzes Plus Stick Radio, Spektrum,Thunderpower 230g, Modified Tri-Nut Novak GTB2, Ballistic 4.5t 550, 5.83lb SCTE Ten, Novak Sentry Brushless Dyno, Crossweight Setup Station, Junsi 20A power supply Icharger 20A Charger,TP610C, 22B, Novak Edge, Novak 13.5, SC10, Havoc Pro SC XDrive, Ballistic 17.5 Matthew Joseph Cordova
mattnin is offline   Reply With Quote
Old 04-01-2007, 09:02 PM   #4
Tech Master
 
Join Date: Mar 2007
Location: illinois
Posts: 1,672
Trader Rating: 26 (100%+)
Send a message via AIM to cheesecake
Default

do you have a how to on this or a link on the directions
cheesecake is offline   Reply With Quote
Old 04-01-2007, 09:39 PM   #5
Tech Champion
 
BuggyKing's Avatar
 
Join Date: Oct 2006
Location: Huntington Beach, Ca
Posts: 7,919
Trader Rating: 17 (100%+)
Default

thats awesome. I wonder if it is similar to the X factory cars?
__________________
Our government is a #$%$ joke, from the head jester on down
RIP Mike M
BuggyKing is offline   Reply With Quote
Old 04-01-2007, 11:06 PM   #6
Tech Elite
 
xlgraphicspro's Avatar
 
Join Date: Dec 2004
Location: Omaha Nebraska
Posts: 2,052
Trader Rating: 3 (100%+)
Default

Have you guys ever bought a case of pop or beer and placed it in your shopping cart? If So, I bet that you noticed that the farther forward you put the case the harder it is to steer. the farther back, the better! I learned that one from Matt Francis. I figure if it ain't broke, don't fix it. and the xxx platform is far from broke
__________________
TeamXray RCAmerica Hudy Xlgraphicspro Paint/ Impulse-Rc Clutch shoes.
Xray XB 808 O.S. Speed Or Ninja JX
xlgraphicspro is offline   Reply With Quote
Old 04-02-2007, 01:31 AM   #7
Tech Addict
 
nudge2325's Avatar
 
Join Date: Jun 2003
Location: Brisbane QLD
Posts: 729
Trader Rating: 13 (100%+)
Default

Quote:
Originally Posted by MadRacer
I saw a couple while i was racing in England. They said it was good for high grip tracks (grass, astro turf) but not too good for dirt. How did it go??

I ran the car out at Ipswich on the weekend Mark and it seems to steer brilliantly and it jumps perfectly flat through the air.
__________________
Club Secretary BRCCC. www.wynnumrc.org.au
My Rides:
2016 Destiny RX10s For Me, 2015 Yokomo BD7 Black For my Son, 2015 Yokomo BD7 Black For my Daughter
Shelf Queens Losi XX4 WE, Yokomo YZ10 (First Proper Race Car).
nudge2325 is offline   Reply With Quote
Old 04-02-2007, 01:32 AM   #8
Tech Addict
 
nudge2325's Avatar
 
Join Date: Jun 2003
Location: Brisbane QLD
Posts: 729
Trader Rating: 13 (100%+)
Default

Quote:
Originally Posted by mattnin
I would think it would steer less than it did before since the CG is moved forward. Do you have a picture of the whole car?

Yes the CG is moved forward compared to the normal layout but this conversion will stop the pendulum effect that normal buggies suffer from.
The weight balance is fairly even front to back.
__________________
Club Secretary BRCCC. www.wynnumrc.org.au
My Rides:
2016 Destiny RX10s For Me, 2015 Yokomo BD7 Black For my Son, 2015 Yokomo BD7 Black For my Daughter
Shelf Queens Losi XX4 WE, Yokomo YZ10 (First Proper Race Car).
nudge2325 is offline   Reply With Quote
Old 04-02-2007, 01:33 AM   #9
Tech Addict
 
nudge2325's Avatar
 
Join Date: Jun 2003
Location: Brisbane QLD
Posts: 729
Trader Rating: 13 (100%+)
Default

Quote:
Originally Posted by cheesecake
do you have a how to on this or a link on the directions
No i haven't done a "how to" or anything like that yet i want to test it a bit more before i worry about doing that.
__________________
Club Secretary BRCCC. www.wynnumrc.org.au
My Rides:
2016 Destiny RX10s For Me, 2015 Yokomo BD7 Black For my Son, 2015 Yokomo BD7 Black For my Daughter
Shelf Queens Losi XX4 WE, Yokomo YZ10 (First Proper Race Car).
nudge2325 is offline   Reply With Quote
Old 04-02-2007, 05:49 AM   #10
Tech Fanatic
 
Join Date: Jun 2006
Posts: 872
Trader Rating: 35 (100%+)
Default

Pendulum effect? What is that?
__________________
High Desert Raceplace, Grand Jct CO, Sanwa Exzes Plus Stick Radio, Spektrum,Thunderpower 230g, Modified Tri-Nut Novak GTB2, Ballistic 4.5t 550, 5.83lb SCTE Ten, Novak Sentry Brushless Dyno, Crossweight Setup Station, Junsi 20A power supply Icharger 20A Charger,TP610C, 22B, Novak Edge, Novak 13.5, SC10, Havoc Pro SC XDrive, Ballistic 17.5 Matthew Joseph Cordova
mattnin is offline   Reply With Quote
Old 04-02-2007, 10:01 AM   #11
Tech Fanatic
 
sport10's Avatar
 
Join Date: Dec 2005
Location: Pensacola, FL
Posts: 969
Default

The pendulum effect is when the rear of the buggy wants to rotate drastically in a turn. This is caused by the motor being mounted in the rear of the buggy causing the CG to be farther rearward in the buggy. By moving the motor forward the CG is closer to the center of the buggy which will make it steer better on high traction surfaces. More like an F1 car. This will be good on high traction surfaces but a problem on slick, low traction surfaces.
__________________
Hot Bodies VE8 w/ RX8-1900 combo
Associated B44
Associated B6
Associated TC7.1
Durango DESC410V2 Pro
sport10 is offline   Reply With Quote
Old 04-02-2007, 10:16 AM   #12
Tech Elite
 
Join Date: Sep 2005
Location: Mass.
Posts: 3,470
Trader Rating: 96 (100%+)
Default

So this handles better than a car with the weight spread out over the entire chassis? I don't see how you would notice a pendulum effect in the corners, but in the air over jumps, yes. By having all of the weight in the center of the car it will seesaw in the air. Ever see an X6 conversion? Did you notice how big the wing is, almost looks cartoonish. I do like the fact that the motors aren't exposed.
K.Copeland is offline   Reply With Quote
Old 04-02-2007, 10:32 AM   #13
Tech Elite
 
Join Date: Jun 2005
Posts: 2,570
Trader Rating: 26 (96%+)
Default

Do you even have to worry about the rear of the car sliding out on a high traction track?
party_wagon is offline   Reply With Quote
Old 04-02-2007, 02:50 PM   #14
Tech Fanatic
 
sport10's Avatar
 
Join Date: Dec 2005
Location: Pensacola, FL
Posts: 969
Default

Quote:
Originally Posted by party_wagon
Do you even have to worry about the rear of the car sliding out on a high traction track?
No, but you do have to worry about grip roll. The momentum has to go somewhere.
__________________
Hot Bodies VE8 w/ RX8-1900 combo
Associated B44
Associated B6
Associated TC7.1
Durango DESC410V2 Pro
sport10 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: MTRONIKS GENESIS TRUCK B/L ESC, FEIGAO 380C-6L MOTOR & REEDY NEO-ONE 4 STAR MOTOR davidrrr R/C Items: For Sale/Trade 5 08-16-2008 03:32 PM
FS/FT NIB LRP 5.5T Brushless motor/ Castle CM-2080 motor Trade for Newer FUTABA S9451 ffpm46 R/C Items: For Sale/Trade 13 03-31-2008 02:17 PM
Modify your stock motor, mod motor, any motor! TRF-Powered Electric On-Road 10 03-15-2007 05:52 PM
Trinity Motor Checker “Monster Horsepower Machine” Motor Performance Monitor CRiXman R/C Items: For Sale/Trade 5 01-25-2007 03:36 PM
Stock motor blowout!!! NEW Hurricane bushing reamer / 767 brushes / motor case LOW$ evostyle R/C Items: For Sale/Trade 0 11-27-2006 11:22 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 06:55 AM.


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