RE: Xray M18T and M18MT RTRs!  
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    • All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> 1/16th, 1/18th, Mini & Micro RC Cars >> RE: Xray M18T and M18MT RTRs!
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    RE: Xray M18T and M18MT RTRs! - 1/27/2008 8:06:00 AM   
    DarkHorse



    Posts: 259
    Joined: 4/22/2005
    From: Gloucester, UNITED KINGDOM
    Status: offline     		> The other 1/10 truck I have, I learned no head ons and landing from a high fall on all 4's.
    Compared to impacts with the weight of a larger truck the m18t is noticeably more crashable. Yes full speed dead stops isn't a good idea. I noticed a potential issue with the M18MT, having larger wheels the truck doesn't bottom out or touch the ground like the m18t setup. This means that the suspension travel is limited by the shocks at full compression, once you hit this limit, any energy from a very high jump will put large stress loads on the shock tower mounting screws. I would expect their threads to strip but would depend on the height of the jump and shock setup. No test evidence as yet and not a problem on the m18t as the chassis will just ground out (scratches up) without stressing the shock towers (with the smaller stock m18t wheels and tires).

    Oh, I finally got a couple of mins ruff on road testing with some loose surface gravel. As expected the larger M18MT tyres (over powered 3s brushless upgrade) don't grip on road anything like as well as the m18t pin tyres. Wasn't impressed on the loose stuff either and seemed to veer/bounce the steering more on small stones. Off road and in grass with obstacles like twigs and holes, the M18MT tyres are much more suitable and doing what they are meant for (I think they look better too). I miss the on road grip and handling of the m18t tyres, even though they are very bald the rubber is a must, swapping them over for next time out.

    _____________________________

    DarkHorse RC: Hornet X-3D, Ecureuil, Airworlf, X-ray M18T, Power & Setup Calculators ;) http://dhrc.rchomepage.com/

    (in reply to Mini_Me)
           Post #: 51

    RE: Xray M18T and M18MT RTRs! - 1/27/2008 8:35:36 AM   
    Mini_Me



    Posts: 1294
    Joined: 9/18/2006
    From: Seattle, WA, USA
    Status: offline     		These might help in that.

    _____________________________

    M18/T FAQ available on http://www.teamxray.com/

    (in reply to DarkHorse)
           Post #: 52

    RE: Xray M18T and M18MT RTRs! - 1/27/2008 10:20:07 AM   
    RC Huligan



    Posts: 357
    Joined: 12/15/2007
    From: Charlotte, NC, USA
    Status: offline     		We got a few sets of those tires for our 4 NT18MTs. We have a race day planned on February 2nd so I'll let you know how they do for us.

    _____________________________

    I help run RC XRAY, an online store where XRAY fans buy their RC cars & kits.

    (in reply to Mini_Me)
           Post #: 53

    RE: Xray M18T and M18MT RTRs! - 1/30/2008 4:39:48 AM   
    fisheydude


     

    Posts: 215
    Joined: 12/19/2007
    From: bowling green, KY, USA
    Status: offline     		I am new to this micro battery pack. I thought I could modify a charger of mine to work. .9amps is the lowest it can charge and it is reccomended to charge @ .12amps for the first charge. I wasn't prepared for that. That isn't a misprint is it? What kind of chargers are you guys using for these tiny battery packs? What is the worst that could happen if I charge them @ .9amps in short time frames? Would it destroy the batteries? I wish I would have looked further into this before but I thought I would be ok. Batteries and chargers are my weak point, I wish I understood them better.

    Any recommended chargers?

    I am fixing to look at the Triton Jr. again. If it can do this battery too, I might get it if the wife won't kill me! I'd like one for my 8.4v nicd and nimh too.

    Is there an el cheapo I could use just for this battery? How about at a battery place or common store? I have no LHS close!

    < Message edited by fisheydude -- 1/30/2008 4:41:14 AM >

    _____________________________

    If it''s a monster truck, drive it like a monster truck!

    (in reply to RC Huligan)
           Post #: 54

    RE: Xray M18T and M18MT RTRs! - 1/30/2008 5:27:19 PM   
    maybelater29


     

    Posts: 363
    Joined: 11/22/2007
    From: South Park, PA, USA
    Status: offline
    quote:

    ORIGINAL: fisheydude

    I am new to this micro battery pack. I thought I could modify a charger of mine to work. .9amps is the lowest it can charge and it is reccomended to charge @ .12amps for the first charge. I wasn't prepared for that. That isn't a misprint is it? What kind of chargers are you guys using for these tiny battery packs? What is the worst that could happen if I charge them @ .9amps in short time frames? Would it destroy the batteries? I wish I would have looked further into this before but I thought I would be ok. Batteries and chargers are my weak point, I wish I understood them better.

    Any recommended chargers?

    I am fixing to look at the Triton Jr. again. If it can do this battery too, I might get it if the wife won't kill me! I'd like one for my 8.4v nicd and nimh too.

    Is there an el cheapo I could use just for this battery? How about at a battery place or common store? I have no LHS close!



    Fishey: As for batteries look at www.cheapbatterypacks.com for a charger, I just oredered the Mulitplex LN-5014 http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXKSY1&P=ML It has all the features of the Triton Jr. and is $5 cheaper.

    _____________________________

    Tek18 / M18MT / TC5 / B44
    pittsburgh1_18racing.com

    (in reply to fisheydude)
           Post #: 55

    RE: Xray M18T and M18MT RTRs! - 1/30/2008 6:44:30 PM   
    DarkHorse



    Posts: 259
    Joined: 4/22/2005
    From: Gloucester, UNITED KINGDOM
    Status: offline     		If you have an Ammeter you could monitor a light bulb (from a car/bike) in series for an initial low current trick charge (~10hrs). Then for subsequent charges monitor what the current flow is without any resistance in line. If your drawing 0.9A then I would expect your pack to get quite hot within an hour (packs perform much better hot). Not that familiar with NiMh or their life span though, so get a second opinion.

    _____________________________

    DarkHorse RC: Hornet X-3D, Ecureuil, Airworlf, X-ray M18T, Power & Setup Calculators ;) http://dhrc.rchomepage.com/

    (in reply to maybelater29)
           Post #: 56

    RE: Xray M18T and M18MT RTRs! - 1/30/2008 8:14:23 PM   
    fisheydude


     

    Posts: 215
    Joined: 12/19/2007
    From: bowling green, KY, USA
    Status: offline     		I went on and charged the batt @ .9amps for 1 1/2 hours. It didn't really get that hot. The charger is a smart charger but I disconnected it before it shut off to be safe. It seems to be running fine. The differential is bugging me. I am trying to set it but when I go to check to see the slip, I am afraid I am going to break something. How easy should the slip be? Did I tighten too much too soon? I am fixing to run it in my garage until the batts go flat. I guess I'll see how it goes.

    _____________________________

    If it''s a monster truck, drive it like a monster truck!

    (in reply to DarkHorse)
           Post #: 57

    RE: Xray M18T and M18MT RTRs! - 1/30/2008 9:23:03 PM   
    DarkHorse



    Posts: 259
    Joined: 4/22/2005
    From: Gloucester, UNITED KINGDOM
    Status: offline     		> charged the batt @ .9amps for 1 1/2 hours. It didn't really get that hot.
    Good but always keep and eye on it, just in case.

    > How easy should the slip be?
    Diffs should not be too tight on stock plastic CVDs (constant velocity drive shafts with universal joints). With the battery disconnected, when you lock the pinion and spur with your finger, hold one wheel and twist the other, if it feels a bit spongy before the ball diff slips then that is pretty tight. Any tighter and you risk breaking a plastic CVD ball spike with this test.

    The other test I do is to hold the truck and lock a pair of wheels solid on the ground and open the throttle. I want some slip and still feel some traction pull from the slipping diff, so the M18MT can crawl up low speed obstacles or save CVDs on jump landings with power. On the other hand you don't want the ball diff too weak such that it slips too easy as soon as the throttle/power is applied. In this case I would expect the balls and plates in the diff to prematurely wear out.

    Edit: A couple of packs setup too weak won't hurt, should bed the balls in nicely. Again, I'm no expert on this, just my assumptions, observations and expectations. Too tight too soon can feel a bit notchy but backing off a smidge for a couple of packs seemed to smooth out.

    < Message edited by DarkHorse -- 1/30/2008 9:31:04 PM >

    _____________________________

    DarkHorse RC: Hornet X-3D, Ecureuil, Airworlf, X-ray M18T, Power & Setup Calculators ;) http://dhrc.rchomepage.com/

    (in reply to fisheydude)
           Post #: 58

    RE: Xray M18T and M18MT RTRs! - 1/30/2008 10:01:30 PM   
    fisheydude


     

    Posts: 215
    Joined: 12/19/2007
    From: bowling green, KY, USA
    Status: offline     		I think I got the diff stuff worked out, I don't think I have them too tight. Thanks for the info Darkhorse. How is your steering and steering trim? Mine seems to only adjust to the right. Even with the trim all the way to the left it still pulls just a very little bit to the right. Enough to notice when trying to go straight for about 6 feet or longer. I guess I can adjust the servo arms (??) to point a bit straighter or a bit to the left. I am going to monkey with it a bit till I get it, just thought you might have some input.

    As for the garage run, OMG!! This little truck does things my 1/10 does without breaking or even showing signs of stress. It jumps and lands much better than I expected. Very fun!! Can't wait for the battery to get broken in good. The floor was a little wet in spots, donuts galore! I know I'm not treating the battery right, but I am charging it now for run number 2. YEE HAW!

    _____________________________

    If it''s a monster truck, drive it like a monster truck!

    (in reply to DarkHorse)
           Post #: 59

    RE: Xray M18T and M18MT RTRs! - 1/30/2008 10:07:07 PM   
    maybelater29


     

    Posts: 363
    Joined: 11/22/2007
    From: South Park, PA, USA
    Status: offline     		Glad you are liking the Xray...I build 5ft high "mountains" out of boxes and pillows and cover it with a Uhaul blanket in my livingroom a "crawl" up and down the thing...My wife hates it

    _____________________________

    Tek18 / M18MT / TC5 / B44
    pittsburgh1_18racing.com

    (in reply to fisheydude)
           Post #: 60

    RE: Xray M18T and M18MT RTRs! - 1/31/2008 12:44:06 AM   
    fisheydude


     

    Posts: 215
    Joined: 12/19/2007
    From: bowling green, KY, USA
    Status: offline     		Of course I have a problem now. Battery problem, just not what you would expect with my charging situation. The battery fell out of the truck and the black wire popped off the pack. I guess I will be in the market for a new battery. I fixed it good enough for the truck to still run but it just won't charge now. It isn't cmpletely dead, it still works in the truck, I just can't seem to get it to charge. Darn it, that's my luck! I would rather have lipo but I think I will have to look at the nimh 1400mAh because of cost. I can't really afford another battery now but I can't fix this one and I can't just look at this sweet truck without running it!

    _____________________________

    If it''s a monster truck, drive it like a monster truck!

    (in reply to maybelater29)
           Post #: 61

    RE: Xray M18T and M18MT RTRs! - 1/31/2008 5:26:19 AM   
    fisheydude


     

    Posts: 215
    Joined: 12/19/2007
    From: bowling green, KY, USA
    Status: offline     		ps

    Anyone know where to find these packs? I can't seem to find any 2/3a 6-cell micro packs shotgun style of any brand.

    _____________________________

    If it''s a monster truck, drive it like a monster truck!

    (in reply to fisheydude)
           Post #: 62

    RE: Xray M18T and M18MT RTRs! - 1/31/2008 6:20:11 AM   
    Mini_Me



    Posts: 1294
    Joined: 9/18/2006
    From: Seattle, WA, USA
    Status: offline     		Xray makes a 6 cell side by side adapter. That will open your choices.

    Battery Holder for 6-Cell In-Line Batt. Pack # 386155

    _____________________________

    M18/T FAQ available on http://www.teamxray.com/

    (in reply to fisheydude)
           Post #: 63

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