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03-25-2006, 08:35 PM
| #1 |
| Pebble Pounder Join Date: Jan 2006 Location: Canada
Posts: 181
|  Motor on wrong side for all laydowns. Since TLT shafties torque twist counter clockwise (looking from the rear), why do all the laydown chassis place the motor on the left side. Would this not further aggrevate the problem? I was thinking that if your turned the tranny around and wired the motor to run reversed, the CG would be biased to the right side of the chassis which would help to counter the torque twist. Obviously this would require 0 degree motor timing, but since most are running lathe motors, this would be no big deal. I'm mocking something up using a Losi tranny and a cheap surplus motor to test my theory. Just wondering if anyone else has experimented with this or interested in hearing comments. |
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03-25-2006, 08:38 PM
| #2 |
| Rock Crawler Join Date: Nov 2004 Location: Roseville
Posts: 561
| I've been running my motor on the right side ever since I went to a laydown tranny. It seems to help a little bit. I'm also curious as to what others say. |
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03-25-2006, 08:46 PM
| #3 |
| Pebble Pounder Join Date: Dec 2005 Location: Albuquerque
Posts: 180
| sounds like a good idea to me |
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03-25-2006, 08:49 PM
| #4 |
| Rock Crawler Join Date: Jul 2004 Location: OC, Oregon
Posts: 815
| Mines on the right  Maybe you didnt notice but the BM chassis has the motor on the right side. And yes imo it helps. |
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03-25-2006, 09:06 PM
| #5 |
| Get off my lawn!   Join Date: Feb 2005 Location: Cleveland, OH
Posts: 7,528
| Mostly because not everybody uses a lathe motor. Some guys use the Mag Mayhem, which is a timed motor and cannot be reversed (without buying the reverse rotation model). I designed the Deep Vee chassis with a backwards tranny, although it was designed around an outrunner motor and is more of a semi-laydown (inclined side plate) design. Outrunners are easy to reverse by swapping two wires. When I offered the kit plans for sale, I included templates for tranny holes on both side plates in case the builder wanted to use a brushed motor and turn the tranny around. Turns out this was a good idea, as at least one buyer did so. When I did the Barnyard Buster, same deal. I could have put the tranny in backwards and limited the motor choices to reversed mod-can motors, but I thought (rightly, it turns out) that finding buyers at $250 a pop would be hard enough, why chase them off with esoteric motor requirements? Spec something they can bolt right in. Designing a chassis around one motor seriously limits the number of buyers you're going to get. Telling the buyer he's going to have to use a zero-timed motor just adds expense to the build, and why do that? You won't get many buyers that way. Better to lose a very little bit of performance and sell a hundred chassis than to get freaky with the motor and wonder why nobody wants your design. Although, with a reversed lathe you should be okay. Just be prepared to answer a lot of "Y DOSE MY TRUK RUN BAKCWERDS?! LOL WTF" posts  |
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03-25-2006, 09:32 PM
| #6 |
| Quarry Creeper  Join Date: Jun 2004 Location: Boaz
Posts: 395
| You should google "esoteric". Kinda spooky stuff. I don't know if that is what you meant or not but still kinda wild. |
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03-26-2006, 09:20 AM
| #7 |
| TEAM MODERATOR   Join Date: Jul 2004 Location: Chit Chat
Posts: 14,103
| I thought it was as easy as spin the axles the right way, spin the tranny the right way, spin the motor the right way = motor on the left. |
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03-26-2006, 10:39 AM
| #8 | |
| Pebble Pounder Join Date: Jan 2006 Location: Canada
Posts: 181
| Quote:
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03-26-2006, 10:45 AM
| #9 |
| 2006 2.2 National Champ  Join Date: Dec 2004 Location: Driving my R/C rototiller
Posts: 7,941
| Isn't the motor facing the back of the truck with this set-up? If it is, motor facing forward is better. Proper link and shock placement can dial out almost all torque twist. |
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03-26-2006, 10:51 AM
| #10 | |
| Get off my lawn! Join Date: Feb 2005 Location: Cleveland, OH
Posts: 7,528
| Quote:
It's one thing to design your own one-off for a backwards motor, but for commercial production, you have to figure a lot of, oh, how to say this diplomatically, "special-needs builders" aren't going to be able to figure out how to zero-time a motor, and you'll be walking them through it when you're supposed to be counting all that mad cash you made In short, if you're going to roll your own, go for it. But don't put it into production unless you want a big headache. | |
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03-26-2006, 11:40 AM
| #11 |
| RCC Addict Join Date: Apr 2004 Location: Santa Clara
Posts: 1,461
| I have ran mine on both sides. I saw no difference that I could note. That doesn't mean there wasn't a difference though, but if there was, I couldn't tell driving it. I can turn my tranny/motor around on center of the chassis so it gave me, I think, a fair comparison. Now if someone comes out with a chassis that eliminates stupid driving, sign me up. I could deal with the minimal torque twist that I have.  -Sam |
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03-26-2006, 10:07 PM
| #12 |
| Quarry Creeper Join Date: Sep 2005 Location: Sydney, Australia
Posts: 376
| every lay down i seen the motor was on the right hand side looking from the rear. |
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