2008.05.31, 04:13 AM
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#1
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Moderator
Join Date: Dec 2004
Location: Los Angeles (Pasadena), CA, USA
Posts: 2,809
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Mrcg Awd...
I told Richard some time back I was cooking up an AWD design, so now that I have time (not really... but I can allocate my time to the point where I sleep at 6AM every day ) I sat down and drew this up.
This is the unorthodox version... great CG and weight balance but the final product of this wouldn't be user-friendly at all -- the last AAA is on the other side of the motor. That's gonna make one helluva saddle pack, as I have been told. The motor would be hard to access as well since one of the screws is deep inside the car. I just stopped working on it because it's a bit too funky, lol...
Enter the orthodox revision.
A proper AAA pack, M18-style sliding motor mount, decent weight balance (needs 8g more on the servo to be perfectly balanced) and very decent CG. Chassis is a reasonable 60mm wide and can accept 94 or 98mm wheelbase bodies. I haven't designed sway bar attachments yet but 1) I don't know if they'll be necessary on a chassis this low and 2) I haven't bought a set for myself yet so I have no measurements.
Why the layout is flipped relative to the MA010: originally, just for space constraints. Putting the servo on the right side of the car allows a tiny bit more room as I can indent the upper deck where necessary. However... I did some research and found that for almost all major manufacturers' shaft-drive cars (Xray M18, Yokomo MR4TC SD, Tamiya TB Evo series, list goes on...) the motor is on the same side of the car as the rear diff. As far as my qualitative analysis goes, I believe it's the best compromise of on-power vs. off-power stability (the motor torque affects the car differently on and off-power, as you guys probably figured). Oh well, it's usually safe to copy the companies that win.
Anyways, as of current this is just a design study. I'll flesh it out a bit more with properly drawn knuckles, CVD's and geartrain and fine-tune the geometries before attempting to produce parts for this bad boy. Please let me know if this is something I should look into producing in the future.
Last edited by color01; 2008.05.31 at 01:52 PM.
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2008.05.31, 05:23 AM
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#2
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iTomCash
Join Date: Feb 2007
Posts: 1,706
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That looks swish. There's a few things I wondered about but none you later covered! Great work. When's the prototype coming?
But... One thing I thought. Is this a first?? I don't recall seeing a custom chassis for AWD?
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2008.05.31, 12:51 PM
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#3
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Moderator
Join Date: Sep 2002
Location: Washington, DC
Posts: 35,480
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pro-z actually made one long ago. check his website
Quote:
Please let me know if this is something I should look into producing in the future.
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thats a silly question you know full well there are always people looking for a better awd platform! including me.
Last edited by arch2b; 2008.05.31 at 12:55 PM.
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2008.05.31, 08:06 PM
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#4
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motor guru
Join Date: May 2006
Location: In front of you...
Posts: 487
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Quote:
Originally Posted by arch2b
...you know full well there are always people looking for a better awd platform! including me.
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+1 on that. I will love to have a 28th scale version or a touring chassis, maybe two of them
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2008.05.31, 08:20 PM
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#5
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Moderator
Join Date: Nov 2001
Location: Goodrich MI
Posts: 6,164
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See... making a chassis AWD is much harder
I gave in, and just put the motor above the batteries... the batteries weigh the most and have weight priority in my mind at least. I might be on my final version of mine, about to create the thread for it soon... (so dont anyone reply about mine in his thread, I hi jacked it enough). Any way my point is to try some concepts with the motor up top...
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2008.06.01, 01:16 AM
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#6
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putting ew back in newb
Join Date: Dec 2003
Posts: 375
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Love it. (Orthodox Version) Hey that's actually a pretty cool Company/product title. Sub-50 to 75 bucks I'd be in for 2. Thought about body mounts yet?
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My Gallery "those now old and wise, once were young and otherwise."
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2008.06.02, 02:25 PM
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#7
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Moderator
Join Date: Dec 2004
Location: Los Angeles (Pasadena), CA, USA
Posts: 2,809
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Shameless double-post, here are the motor mount and the redesigned bulkheads, which are now completely identical front and rear.
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2008.06.02, 02:45 PM
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#8
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Registered User
Join Date: Mar 2006
Location: St. Louis, MO
Posts: 153
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Color0-this wouldn't be too difficult to make at all if it uses MA-010 diffs, knuckles, and axels. It looks like an awesome idea so far!
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2008.06.02, 02:47 PM
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#9
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Moderator
Join Date: Sep 2002
Location: Washington, DC
Posts: 35,480
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i'm not sure this has been asked yet, but will this incorporate adjustable wheelbase? if so, can you illustrate/explain how this would be done?
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2008.06.02, 08:45 PM
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#10
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Moderator
Join Date: Dec 2004
Location: Los Angeles (Pasadena), CA, USA
Posts: 2,809
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Pretty simple system, basically the same as the MA010's. There are two sets of holes, one for 94 and one for 98mm.
So you can do 94mm:
Or 98mm:
No I haven't drawn the gears yet, it's going to take a couple tries.
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2008.12.28, 10:13 PM
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#11
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Do you want to go fasst??
Join Date: Oct 2006
Location: Miami FL./ Sto Dgo, Dom Rep.(The Jungle)
Posts: 1,867
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Quote:
Originally Posted by color01
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Brian,
Perhaps a small platform (Tray) made of Composite G10/FR-4 Exposy on top of the motor and servo, were the electronic unit PCB would rest on, could be good, in line to prevent the motor heat to transfer to the PCB, as well as electric noise, plus it will add the bit of extra weight you need, in order to balance weight distribution.
Cheers
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2008.12.29, 01:21 AM
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#12
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The Galliant Dude
Join Date: Mar 2008
Location: Northern VA
Posts: 920
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Have you considered taking some ideas from the design posted in this thread- http://www.minizracer.com/forums/sho...1&postcount=39
Check the pictures in post 39 and 40 from samy.
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2008.12.29, 02:47 PM
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#13
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Do you want to go fasst??
Join Date: Oct 2006
Location: Miami FL./ Sto Dgo, Dom Rep.(The Jungle)
Posts: 1,867
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Sorry to cut in Action B
Btw, wish ya a very happy new year.
I bet that Brian definitely, will come up with something much better than that modified MA-010, which by the way is far to wide and still the same old quality junk Mini-z offers
Trust this guy, he is an natural ingenious in the field, I haven’t read the 1st issue on his 1st design the MR-CG, to me a great design but 2wd.
The actual chassis on blueprint here, seems a good platform to begin with, and the idea of coming up with an chassis in which you have the option to choose between regular rear end and SAS, will be perfect to satisfied our needs of rear-end preferences, as well as, the possibilities of using the parts already available in the market.
NO WORRY , perhaps Brian will evolutionize this design while in its course of development.
We have to be aware of Color0 questions, to provide him with our needs and demands, so that he can move on with it, while revising our input.
Thx for your time.
Cheers
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2008.12.29, 02:52 PM
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#14
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Type less Drive More
Join Date: Dec 2006
Location: santa clara, ca
Posts: 96
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Brian,
Looking forward to seeing the awd come along like your 2wd did.
You have time for this and being in school ?
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2009.07.17, 11:27 AM
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#15
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Slip Angle Chaser
Join Date: Sep 2007
Location: Millstone, NJ
Posts: 1,880
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Quote:
Originally Posted by color01
I told Richard some time back I was cooking up an AWD design, so now that I have time (not really... but I can allocate my time to the point where I sleep at 6AM every day ) I sat down and drew this up.
This is the unorthodox version... great CG and weight balance but the final product of this wouldn't be user-friendly at all -- the last AAA is on the other side of the motor. That's gonna make one helluva saddle pack, as I have been told. The motor would be hard to access as well since one of the screws is deep inside the car. I just stopped working on it because it's a bit too funky, lol...
Enter the orthodox revision.
A proper AAA pack, M18-style sliding motor mount, decent weight balance (needs 8g more on the servo to be perfectly balanced) and very decent CG. Chassis is a reasonable 60mm wide and can accept 94 or 98mm wheelbase bodies. I haven't designed sway bar attachments yet but 1) I don't know if they'll be necessary on a chassis this low and 2) I haven't bought a set for myself yet so I have no measurements.
Why the layout is flipped relative to the MA010: originally, just for space constraints. Putting the servo on the right side of the car allows a tiny bit more room as I can indent the upper deck where necessary. However... I did some research and found that for almost all major manufacturers' shaft-drive cars (Xray M18, Yokomo MR4TC SD, Tamiya TB Evo series, list goes on...) the motor is on the same side of the car as the rear diff. As far as my qualitative analysis goes, I believe it's the best compromise of on-power vs. off-power stability (the motor torque affects the car differently on and off-power, as you guys probably figured). Oh well, it's usually safe to copy the companies that win.
Anyways, as of current this is just a design study. I'll flesh it out a bit more with properly drawn knuckles, CVD's and geartrain and fine-tune the geometries before attempting to produce parts for this bad boy. Please let me know if this is something I should look into producing in the future.
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Any update on this chassis color01?
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