R/C Tech Forums

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

    Hide Wikipost
Old 07-29-2016, 08:27 AM   -   Wikipost
R/C Tech Forums Thread Wiki: New Schumacher KF2
Please read: This is a community-maintained wiki post containing the most important information from this thread. You may edit the Wiki once you have been a member for 90 days and have made 90 posts.
 
Last edit by: MelKF2
Welcome to the KF2 Wiki!

Please feel free to add any Tips, Tricks, or anything that would be beneficial to the KF2 Family

Introduction and Pictures Introduction and Pictures

ElectronicsSetupElectronicsSetups

Setup SheetsSetup Sheets

EmulsionShocksEmulsion Shocks

Tony Newland Gear Diff BuildTony Newland Gear Diff Build

Suggested Gearing

6.5
7.5
8.5
9.5
10.5
13.5
17.5 I ran 69/31 at SRS Scottsdale Arizona and 72/30 at MHOR Aurora Co and Full Throttle ALB, NM RCM lockout worked excellent!


MIP pucks excellent upgrade! The new RCM lockout is an excellent piece as well! These options will greatly reduce weight throughout the drive line!

Print Wikipost

Like Tree5Likes
Reply
 
Thread Tools Search this Thread
Old 03-23-2015, 04:55 AM   #166
Tech Fanatic
 
alport78's Avatar
 
Join Date: Jun 2010
Posts: 771
Default

Stealth look done
Attached Thumbnails
New Schumacher KF2-dsc_0007.jpg  
__________________
Schumacher KF2
alport78 is offline   Reply With Quote
Old 03-24-2015, 09:53 AM   #167
Tech Adept
 
motorcitymatt's Avatar
 
Join Date: Mar 2015
Location: Royal Oak, MI
Posts: 194
Default

That looks solid. What kind of paint did you use on the body? Did you paint the outside or inside? I can't tell from the picture.
__________________
Schumacher Cougar KC, KF2 SE
RC Clubhouse in Warren, MI
DiscountRCStore.com (The best online hobby shop)
motorcitymatt is offline   Reply With Quote
Old 03-24-2015, 02:41 PM   #168
Tech Fanatic
 
alport78's Avatar
 
Join Date: Jun 2010
Posts: 771
Default

Black from inside. Tamiya ps-55 from outside for matte finish.
__________________
Schumacher KF2
alport78 is offline   Reply With Quote
Old 03-25-2015, 10:37 AM   #169
Tech Fanatic
 
alport78's Avatar
 
Join Date: Jun 2010
Posts: 771
Default

Build went well
Attached Thumbnails
New Schumacher KF2-dsc_0011.jpg   New Schumacher KF2-dsc_0009.jpg  
__________________
Schumacher KF2
alport78 is offline   Reply With Quote
Old 03-25-2015, 10:40 AM   #170
Tech Fanatic
 
alport78's Avatar
 
Join Date: Jun 2010
Posts: 771
Default

I Removed most Of the slipper parts fully fasten it for stock carpet racing to reduce rotating mass
Attached Thumbnails
New Schumacher KF2-dsc_0007.jpg  
__________________
Schumacher KF2
alport78 is offline   Reply With Quote
Old 03-25-2015, 10:46 AM   #171
Tech Regular
 
Thomas PA's Avatar
 
Join Date: Mar 2011
Location: York
Posts: 304
Default

I'm thinking of picking one of these up for stock. I'd definitely be doin the shorty conversion and the carbon chassis is it would be used for indoor clay in the winter and clay outdoor in summer. Neither are high traction. So I'm wondering, how does the rolling resistance of the belt system compare to a 3 or 4 gear tranny? Also, is it feasible to get this thing down around minimum weight? Assuming 220g for the battery.
And I'm not afraid to be the first, but has anyone already run this on an outdoor track where traction can be kinda low?
__________________
-Thomas Kauffman
KDRC Carbon Fiber Upgrades
Bumps & Jumps RC, Pit Stop Hobbies
X6^3: Tekin, Fantom, Sav÷x
B5M: KDRC, Fantom, hobbywing, Sav÷x, Schelle, AC RC
Thomas PA is offline   Reply With Quote
Old 03-25-2015, 05:19 PM   #172
Tech Regular
 
Jpdanger's Avatar
 
Join Date: Feb 2015
Location: TRCR
Posts: 386
Default

Quote:
Originally Posted by alport78 View Post
I Removed most Of the slipper parts fully fasten it for stock carpet racing to reduce rotating mass
Is that a spacer I see? You'll have to post how this works out for you. I'm currently running the full slipper in stock.

Coming from the b5M, I've noticed my KF2 has tremendous acceleration, but lacks top end. It's not substantial, but noticeable. What ground my B5M may gain in the straights will only be lost in the infield.

I'm loving my new KF2!
__________________
I buy RC cars for my kids like a man buys a bowling ball with his name on it for his wife.

"What I say makes sense in my head. Once it comes out of my mouth it's for you to figure out." -me
Jpdanger is offline   Reply With Quote
Old 03-25-2015, 07:14 PM   #173
Tech Regular
 
Jpdanger's Avatar
 
Join Date: Feb 2015
Location: TRCR
Posts: 386
Default

What was the purpose of not going with the swapable side gears on the KF2? Does Schumacher plan on offering this as an option in the future?
__________________
I buy RC cars for my kids like a man buys a bowling ball with his name on it for his wife.

"What I say makes sense in my head. Once it comes out of my mouth it's for you to figure out." -me
Jpdanger is offline   Reply With Quote
Old 03-25-2015, 07:35 PM   #174
Tech Adept
 
motorcitymatt's Avatar
 
Join Date: Mar 2015
Location: Royal Oak, MI
Posts: 194
Default

I'll be interested to see how eliminating the slipper works out in terms of durability long term. Do you think having little to no give on a high traction surface might be a little hard on the rest of the drivetrain? I think you mentioned a few posts back that you were running on medium traction carpet so perhaps it is not that much of an issue. I am assuming people you race against do the same thing in the stock class? Are you at a noticeable/measurable disadvantage running against other cars in the class that are set up this way?

The car looks sweet btw.
__________________
Schumacher Cougar KC, KF2 SE
RC Clubhouse in Warren, MI
DiscountRCStore.com (The best online hobby shop)
motorcitymatt is offline   Reply With Quote
Old 03-25-2015, 08:03 PM   #175
Tech Adept
 
motorcitymatt's Avatar
 
Join Date: Mar 2015
Location: Royal Oak, MI
Posts: 194
Default

Quote:
Originally Posted by Thomas PA View Post
.....how does the rolling resistance of the belt system compare to a 3 or 4 gear tranny?
This is really hard to quantify objectively. To really know the answer you would have to be able to measure the rotating mass and frictional losses of both systems. Otherwise you are making an educated guess subjectively by "feel".

If you add up the mass of the shafts, side gears, pulleys and belt involved with the KF2 drivetrain I am betting it will compare similarly with mass of the gear transmissions found in other cars, maybe a little heavier. However, the belt and pulleys are more efficient than the gears in terms of friction so that might help to even the score.

Purely speculating I would expect a properly adjusted (tension) belt drive system to have negligible differences between a typical gear transmission in terms of overall efficiency.
__________________
Schumacher Cougar KC, KF2 SE
RC Clubhouse in Warren, MI
DiscountRCStore.com (The best online hobby shop)
motorcitymatt is offline   Reply With Quote
Old 03-26-2015, 01:11 AM   #176
Tech Regular
 
Join Date: Sep 2011
Location: Southampton
Posts: 492
Default

I suspect they will be offering the alternative side gears in time as it was a good option when the traction wasn't there to use the high inertia ones. During the build I tried my ones from the KF and they could be made to work if I made some spacers.

Friction in the drive train and comparing gear to belts is a difficult one. If you try guessing by turning the transmission in your hand you would instantly say that gear was more efficient but their friction increases with load , but from driving belt driven cars I think the on power friction is fairly static under load whilst it seems to increase off power. I know in 4wd belt is more efficient as the bevel gears in shaft drive systems suck power when under load. Comparing a single belt to a gear transmission on a 2wd buggy though is tough.
Badger5 is offline   Reply With Quote
Old 03-26-2015, 01:28 AM   #177
Tech Fanatic
 
alport78's Avatar
 
Join Date: Jun 2010
Posts: 771
Default

Quote:
Originally Posted by Jpdanger View Post
Is that a spacer I see? You'll have to post how this works out for you. I'm currently running the full slipper in stock.

Coming from the b5M, I've noticed my KF2 has tremendous acceleration, but lacks top end. It's not substantial, but noticeable. What ground my B5M may gain in the straights will only be lost in the infield.

I'm loving my new KF2!
Yes this is a plastic spacer from one of mine 1/8 buggies. You can olsa use a longer spring.

Quote:
Originally Posted by motorcitymatt View Post
I'll be interested to see how eliminating the slipper works out in terms of durability long term. Do you think having little to no give on a high traction surface might be a little hard on the rest of the drivetrain? I think you mentioned a few posts back that you were running on medium traction carpet so perhaps it is not that much of an issue. I am assuming people you race against do the same thing in the stock class? Are you at a noticeable/measurable disadvantage running against other cars in the class that are set up this way?
The car looks sweet btw.
We race for a long time on same surface. This is not my first buggy. We allways use locked slippers with other cars (serpent, yokomo) if the car don't wheelie and never had an issue . I race only once a month, so long term will be very long for me
__________________
Schumacher KF2
alport78 is offline   Reply With Quote
Old 03-26-2015, 01:31 AM   #178
Tech Fanatic
 
alport78's Avatar
 
Join Date: Jun 2010
Posts: 771
Default

Quote:
Originally Posted by Thomas PA View Post
I'm thinking of picking one of these up for stock. I'd definitely be doin the shorty conversion and the carbon chassis is it would be used for indoor clay in the winter and clay outdoor in summer. Neither are high traction. So I'm wondering, how does the rolling resistance of the belt system compare to a 3 or 4 gear tranny? Also, is it feasible to get this thing down around minimum weight? Assuming 220g for the battery.
And I'm not afraid to be the first, but has anyone already run this on an outdoor track where traction can be kinda low?
There are new shorties around 150g but I don't know if those will be a good choice for low traction.
__________________
Schumacher KF2
alport78 is offline   Reply With Quote
Old 03-26-2015, 04:08 AM   #179
Tech Regular
 
Thomas PA's Avatar
 
Join Date: Mar 2011
Location: York
Posts: 304
Default

Thanks for all the responses! Very good point with how they behave differently under load. Assume 220g for the battery cause that's what mine weighs. Haha. I like to run a fairly large pack to reduce power loss
__________________
-Thomas Kauffman
KDRC Carbon Fiber Upgrades
Bumps & Jumps RC, Pit Stop Hobbies
X6^3: Tekin, Fantom, Sav÷x
B5M: KDRC, Fantom, hobbywing, Sav÷x, Schelle, AC RC
Thomas PA is offline   Reply With Quote
Old 03-26-2015, 04:39 AM   #180
Tech Fanatic
 
alport78's Avatar
 
Join Date: Jun 2010
Posts: 771
Default

I build the shocks emulsif with stock caps according to manual . What are the vented caps for ? do they have any advantage if you run emulsion shocks ?
__________________
Schumacher KF2
alport78 is offline   Reply With Quote
Reply



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 09:51 AM.


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