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12-12-2016, 03:19 PM | #51 |
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If it got any more exciting, a funeral would have marched by.
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12-12-2016, 03:47 PM | #52 |
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wrong thread
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12-12-2016, 04:24 PM | #53 |
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You guys can say what you will, even though I doubt you have tried one, but I have fun with it and in the end that is what matters.
I get the same kind of comments on the rock crawler because it has a top speed of 3mph. |
12-12-2016, 04:26 PM | #54 |
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My house has 3 of the SCX-10s, we have a slash too but that just never got as many hours of use as the Axials. My two youngest and I would go for a hike near one of the lakes and take the crawlers with us. Good fun.
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12-12-2016, 04:29 PM | #55 |
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I actually think the slow stuff is cool, like if you have a little pile of rocks you could rock crawl in your back yard. The little construction equip is neat, there are people that actually build things with rc excavators and dump trucks, etc.
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12-12-2016, 04:56 PM | #56 |
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Member#: 30733
Join Date: Dec 2002
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TXIC
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Vehicle:2007 tiny car striped |
So this is your rocket? Cool! My son and I love playing with Estes rockets, but I always wanted to try something bigger. Do you have to go to a sanctioned field for something like that?
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12-12-2016, 05:50 PM | #57 | |
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12-12-2016, 05:54 PM | #58 |
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My wife and I both love our rock crawlers. 50mins of run time and fun to dink around with at camp.
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12-12-2016, 08:29 PM | #59 |
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I bought it at my LHS. 4x4 and brushless. I'm going on vacation soon so will put off LiPo + better charger (as suggested by aschen) until I'm back to receive packages. 2S + regear or straight to 3S? I'm tempted to do the latter, and that's what the dude at the hobby shop recommended. |
12-12-2016, 08:30 PM | #60 |
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Also, any recommendations on stickier tires for running on grass and snow? Do people typically buy them as wheel/tire combos?
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12-12-2016, 10:08 PM | #61 | |
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12-12-2016, 10:42 PM | #62 | |
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Thanks for the charger tip in the purchases thread. Chargers + power supplies + connectors are a whole rabbit hole I haven't been down in 20 years, back when I rocked some sort of monster truck and a two motor catamaran RC boat. Those years were fun and ended precisely when I got my license. What I'm thinking for after I get back from my short vacation, based in part off of your initial suggestions: - iCharger "The Ticket" combo (iCharger 206B and Junsi P350) - JST-XH + Traxxas modular board setup with that, which I understand would allow me to charge two packs in parallel - hunt down three LiPo packs from a reputable manufacturer: 3S, Traxxas main connector + JST-XH balancing connector, at least 25C and 5000 mAh (Traxxas makes one just like this at 5000 mAh but $75 per pack seems rich at first glance) This would give me one pack in the car, two on the charger each charging at 20A (which at ~150W would still leave plenty of headroom for the 300W charger and 350W power supply). Sound like a sane plan? Edit: Per this link http://rogershobbycenter.com/lipoguide/ it looks like 1C charging is recommended. That'd be 5A for 5000 mAh, 5.5 for 5500, etc. That in turn would render the fancier charger total overkill. 106B+ it is. Last edited by shikataganai; 12-12-2016 at 11:32 PM. |
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12-12-2016, 10:45 PM | #63 | |
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Long story short it is very sanctioned. If you go to www.tripoli.org there is a ton of info on the high power rocketry hobby and what you need to do to participate. It's is similar to the AMA where you pay yearly dues that covers you with insurance as long as you follow the prescribed rules. If you take a look and have any questions not covered on the website feel free to PM me. I started with Estes as a kid too . |
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12-12-2016, 11:05 PM | #64 | |
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12-12-2016, 11:05 PM | #65 | |
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Better deal on paper is this: https://smile.amazon.com/Floureon-55...-no-redirect=1 . That'd be $70 for two 3S 5500 mAh 35C batteries with Traxxas + JST-XH leads just as desired. |
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12-12-2016, 11:36 PM | #66 |
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Yeah I think you pretty much got it. The cheaper batteries will be fine. You can parallel charge if you want as well. You will need some banana plugs connectord, and wire to hook up everything. You can buy some leads or solder things together younself. Also take a half hour or so to read up on lipo safety if you are not familiar.
Aschen buys super cheap lipo batteries most of the time, even tutnigy / HK |
12-12-2016, 11:44 PM | #67 |
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LiPos scare me. There's a reason I ran LiFePO4 on my e-bike, and it wasn't because it was cheaper or higher energy density!
It seems I'd be ok as long as I keep that **** in a LiPo charging bag all the time and used the charger's fancy "storage mode" religiously. And maybe buy a CO2 extinguisher for the garage. |
12-12-2016, 11:55 PM | #68 |
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I'm still afraid to use them. Anecdotal, but a friend of a friend left one charging and came back to the fire department there when it burnt down his whole garage including the car in it. Not worth the risk to me for recreational use.
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12-13-2016, 12:06 AM | #69 |
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They are pretty much only going to catch fire while being charged incorrectly, after a major wreck, or if accidentally shorted. Still you are putting a lot of faith in a hobby grade charger and related equipment to keep you safe.
In general they do not spontaneously combust even if mistreated I charge mine in a bag and put the bag in a surplus ammo can (not completely sealed). |
12-13-2016, 09:02 AM | #70 | |
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It will not stop the thermal runaway. The only way to stop that is to cool the battery to the point where the reaction stops. Otherwise it will continue for 20-40min. Back in November I saw a presentation about what airlines are having to do to mitigate the risks these things pose. On average, each passenger is carrying 2 devices that have Lithium chemistry batteries. Brand or origin of battery is irrelevant...devices from every major OEM have been documented with multiple cases of catastrophic failure. The smoke and fumes are toxic. The little fireworks spewing out are molten copper, and cause 3rd degree burns on contact. Fire extinguisher agents are ineffective at halting the reaction. The crews are, forthe most part, not equipped nor trained to combat a fire from a continuous source. The only real option is containment, and from what I've seen, a $10 charging bag barely does anything. I charge my 6Ahr 3S Lipo down inside a cinderblock. |
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12-13-2016, 09:09 AM | #71 | |
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12-13-2016, 10:31 AM | #72 |
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agreed you need something more substantial than just the lipo bag. Those things are like the old timey recommendation for students to get under there desk in the event on nuclear bomb.
The fire exstinguisher you want is class D (solids) for metal fires. In full disclosure I do not have one. The cinder block method is a good one as well. People use a sand bag as a cover so if something catches fire the bag will melt and cover the fire. I don't think the fire requires any outside oxidizer so Im not sure how quick or effective the smothering action is. I had 1 Lipo incident in the decade I have been using them. I accidentially pulled out the charging cord while in operation and shorted the two leads together. The battery swelled instantly, luckily the charging cable was "only" 16 gauge and poped like a fuse. the wire lit up like a dull light bulb for an instant. It is pretty straightforward to keep them from charging around flammable items however. They are dangerous in the same way a chainsaw or a bottle of drano is dangerous. With some care you can keep safe |
12-13-2016, 01:37 PM | #73 |
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I store mine in a lipo bag inside an ammo box. Not sure if it will prevent the box from exploding or a fire but it must be better than leaving it on my workbench.
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12-13-2016, 02:24 PM | #74 | |
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Quote:
Lipos: Traxxas or SPC Racing. If you use the "proprietary" Traxxas batteries and chargers, it's easier and faster to charge them. You just plug in the main (black) plug. All other Lipo chargers and batteries, you'll need an adapter for the Traxxas style plugs and you'll need to use a second plug in (usually white) each time for "balance charging" to charge all the cells in the Lipo. |
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12-13-2016, 05:08 PM | #75 | |
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With regard to the charger/battery situation: All Traxxas: - $75/pack for 3S 5000 mAh - $50 for their proprietary charger that'll do 40W peak (so 3.6A or 0.75C or so) for a single pack: On the upside that charger appears to have a built in power supply: https://traxxas.com/sites/default/fi...er-INST-EN.pdf Aftermarket: - $70 for 2 packs of 3S 5000 mAh set up already with Traxxas and JST-XH plugs - $209 for a nice charger/power supply setup that would comfortably charge two packs at a time at 5A/1C via a modular board: http://www.progressiverc.com/the-ticket-350w-combo.html For 2 packs Traxxas would cost $200 vs. $279 for the aftermarket route that uses the fiddly JST-XH balance cables. At 4 packs it's then $350 vs. $349 and the lead grows for the aftermarket setup thereafter. I think I'll go with the more expensive option up front so as to not be locked into the Traxxas ecosystem and to allow for parallel charging and other fun stuff. |
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