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R/C Tech Forums Thread Wiki: New Schumacher KF2
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Welcome to the KF2 Wiki!

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

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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!

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Old 08-03-2015, 04:23 AM   #391
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Rear bb shocks rearward and small bore frontward may be a way to prospect, changing the stock wing mount for the exotek aluminum one may give some roll too as more heavy.
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Old 08-03-2015, 07:23 AM   #392
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Originally Posted by motorcitymatt View Post
I found some more nice pictures of the KF2 with the MM conversion. These are Ben Jemison's car he is going to run at the Euro's this week.

https://www.facebook.com/41103186907...53621421486013

https://www.facebook.com/41103186907...53621404819348

Take a look at the rear toe-in blocks. Are those brass? All the ones I have seen are black anodized aluminum.
see all of that room behind the motor. i'd put an ESC there!
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Old 08-03-2015, 07:37 AM   #393
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I was thinking the same thing. Or if not the ESC there is plenty of room to add stick-on weight on either side.

The surface they are running on is pretty loose if they are using Holeshots and ribbed fronts. The car as pictured is not reversing the rear arms and not running any additional rear weight that I can see (unless those toe blocks are heavier). This makes me feel a bit more confident about the how the conversion is going to perform.
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Old 08-03-2015, 08:19 AM   #394
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Originally Posted by motorcitymatt View Post
I was thinking the same thing. Or if not the ESC there is plenty of room to add stick-on weight on either side.

The surface they are running on is pretty loose if they are using Holeshots and ribbed fronts. The car as pictured is not reversing the rear arms and not running any additional rear weight that I can see (unless those toe blocks are heavier). This makes me feel a bit more confident about the how the conversion is going to perform.
I agree ESC to the rear should balance out even side to side and add rear weight. This might also eliminate the servo weight issue that some are concern about as well!

Last edited by MelKF2; 08-03-2015 at 08:45 AM.
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Old 08-03-2015, 08:37 AM   #395
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see all of that room behind the motor. i'd put an ESC there!
B. Jemison seems to like removing the anodizing (See KF2 set ups BJ Astroturf) I use Grease Lighting to remove anodizing works great!
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Old 08-03-2015, 12:13 PM   #396
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The surface they are running on is pretty loose if they are using Holeshots and ribbed fronts. The car as pictured is not reversing the rear arms and not running any additional rear weight that I can see (unless those toe blocks are heavier). This makes me feel a bit more confident about the how the conversion is going to perform.
Holeshots are handout tires so it's not a racer's choice. From what I read, the grip is rather high on the Euros track (blue or blackgroove, don't know the diff) so I am not sure that it is really informative about the new kit for lower grip tracks.
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Old 08-03-2015, 04:02 PM   #397
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I asked what the weight distribution was with the rear motor setup.... no reply..

Im curious to how much it shifts the rear after all with the battery in the middle...
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Old 08-03-2015, 05:01 PM   #398
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I just messeged with Muz (Schumacher racing team manager) on fb and he is going to send me pics and info throughout the weekend as the factory drivers change their setups for the conditions. They feel really good in practice with the new mid motor conversion...

here's a link to watch the race live...

http://rcracingtv.net/
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Old 08-03-2015, 06:29 PM   #399
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Quote:
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I asked what the weight distribution was with the rear motor setup.... no reply..

Im curious to how much it shifts the rear after all with the battery in the middle...
My initial measurements (without the top brace but minus the aluminum side braces) show basically no change in F/R weight distribution. I think this is because as you have pointed out the battery sits pretty far forward. And if you look at how much open area there is behind the motor between and beside the trans housings it starts to add up. The trans/motor pod weighs about 290g with my Reedy motor vs 210g for a standard shorty lipo. But a majority of the mass is in the motor and it doesn't get far enough back to make a difference with the battery that far forward I guess.

I also found that because the battery ends up square on top of the center of mass going to a lighter battery doesn't help either. The car gets lighter overall but the weight distribution does not change.

I should have my conversion done Wednesday to take some final measurements. I'm interested to hear what the factory says.
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Old 08-03-2015, 06:32 PM   #400
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Quote:
Originally Posted by Tony Newland View Post
...he is going to send me pics and info throughout the weekend as the factory drivers change their setups for the conditions...
Wow. Thanks for doing that. Anything you can share with us through that channel should be really helpful
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Old 08-04-2015, 09:10 AM   #401
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Wow. Thanks for doing that. Anything you can share with us through that channel should be really helpful
.. +1



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Old 08-04-2015, 03:45 PM   #402
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Here's the first day of quals report:

I asked about the weight distribution front to rear with the new mid motor and any change in wheelbase:

Hi Tony just asked Trish about those questions you wanted to know about. So with the weight distribution it is similar to the low grip conversion with a full size shorty lipo battery, however when you use a LCG newer style lipo battery it puts the weight further back, by maybe about 1-2% as these are about 60 grams lighter in weight. The team have been running some stick on weights between the centre and rear transmission housings of around 30-40 grams, which increases the balance further back to then be about 61% rear balance. The wheelbase is exactly the same, it is purely a motor shift to get the motor to generate more rear grip with its reaction on the chassis. Hope this helps and makes sense.

And some pics of Ben Jemison, Peter Pinisch and Orlowski cars as well as qualifying after 3 rounds:

I also have a message in with Ben to share some of the setups their running this weekend
Attached Thumbnails
New Schumacher KF2-11796302_10155962777240232_5665061708247742109_n.jpg   New Schumacher KF2-11755817_10152913182456433_6760537093238163976_n.jpg   New Schumacher KF2-11221592_10152913182351433_5022453149101201293_n.jpg   New Schumacher KF2-11817050_10152913182561433_7276706161641924824_n.jpg  
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Old 08-04-2015, 04:22 PM   #403
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Few more pics Muz sent me of Ben's, Orlowski and Peters cars...
Attached Thumbnails
New Schumacher KF2-11824257_1622241394712185_231833162_n.jpg   New Schumacher KF2-11850772_1622240491378942_424580100_n.jpg   New Schumacher KF2-11221592_10152913182351433_5022453149101201293_n.jpg  
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Old 08-04-2015, 04:23 PM   #404
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1 more
Attached Thumbnails
New Schumacher KF2-11823796_1622240084712316_1464264540_n.jpg  
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Old 08-04-2015, 06:36 PM   #405
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Excellent! Those are all really nice photos and what a privilege to get those along with a first hand account from the team manager.

Some observations:
  • From what I can tell it looks like all but Orlowski's car are using the small bore shocks
  • I see quite a few titanium screws throughout all the cars. They are probably trying to save some weight that can then be redistributed to the rear
  • The car with the red battery pack has a different top brace than the other two, which matches the one in the photos of the production kit
  • I think all of them are using MIP shiny drive CVDs + pucks
  • The car with the red pack also has the lighter colored toe blocks, which may be something heavier than aluminum alloy

And from what is sounds like from Trish via Muz, it is just like I was saying a few posts back, they are relying mostly on the dynamic forces of the motor to manipulate the chassis. The only thing that doesn't square with my initial measurements is that going to the lighter pack actually results in a more rearward distribution. But seeing as how I don't even have the conversion parts yet and was mostly eyeballing the placement I could have had the battery out of position. I will know for certain tomorrow night after I get the conversion done.

I got a chance to watch a couple of the qualifying heats using the link Tony provided. Orlowski's car and Pinisch's car both looked really on point. I didn't see anything to make me think that they were struggling to find rear traction. They both should be in the A-main no problem with where they have qualified so far.
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