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i got my batteries from fastrcbatteries.com,they work great.i only went to them cause i put an order in at hobbyking,checked my shipping status 3 weeks later and my batteries never even shipped so i canceled my order from them.i also tried hobbypartz cause they had a decent deal on chargers,so i ordered the thunder ac6.Got it in 2 weeks after order to find out it wouldnt charge my batteries correctly.Had to send that back.I wont order batteries from anywhere but fastrcbatteries now.john the owner usually ships them out next day,it took 2 days to get to me from pennsylvania to dallas.And he is more than happy to talk to you about any problems on the phone.I ordered 2 7.4 2s 5000 mah 40c.2 days later i ordered the same thing but he didnt have them in stock so he sent me same battery in a 45c and he will put whatever connector on it you need
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UPDATE: ran with some turnigy 4000mah 40-50c's and got a little better speed, 32.3 so there may be some truth to the venom batt problem but still seems a bit slow compared to what others are reporting here. my best recorded run on the venoms was 31 so I got a ~5% increase with better batteries. guess it's time to look into props(and 5s maybe).Comment
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What prop are you running on this? There may be some variance in the stock plastic, but you should be getting closer to 35mph out of the stock setup.
Still, you DO want to get a better prop anyhow. There are lots of recommendations on these threads. And X645 is a good place to start. Or an ABC 45x55. Either will wake your MG right up... You don't NEED 5S to go fast... but it does help increase the speed without pushing up the amps, so if you can afford it, give it a try.Darin E. Jordan - Renton, WA
"Self-proclaimed skill-less leader in the hobby."Comment
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I've got a PB stiletto prop I picked up based on some readings around the board here. It was a cheap and easy upgrade to ditch to stock plastic prop and get rid of any flexing or imperfections in the plastic. And from what I read people even saw some speed increases just going from the plastic prop to the stainless. I've played with throttle trim/limits on my TX a TnT'd the strut until I got max speed. Seems my MG is just a bit slower than the others
I will definitely try a new prop down the line. Just wanted to get a good stock baseline before I started trying new parts. As for 5s, I am planning on buying another set of batts either way so rather than get another 4s setup I figured I may as well go 5s. That way I can still tune and play with my current 4s packs but if I ever want a quick speed fix I can throw in 5s.Comment
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Try a grim 42x55. Should get you good all around results on 4s & 5s. Make sure you take the proper steps in running 5s their is thread floating around how to do it on this esc. I ran mine on a x642 on 4s & 5s and it moved pretty good. I think the 42x55 is a better option for this hull though. JMOI've got a PB stiletto prop I picked up based on some readings around the board here. It was a cheap and easy upgrade to ditch to stock plastic prop and get rid of any flexing or imperfections in the plastic. And from what I read people even saw some speed increases just going from the plastic prop to the stainless. I've played with throttle trim/limits on my TX a TnT'd the strut until I got max speed. Seems my MG is just a bit slower than the others
I will definitely try a new prop down the line. Just wanted to get a good stock baseline before I started trying new parts. As for 5s, I am planning on buying another set of batts either way so rather than get another 4s setup I figured I may as well go 5s. That way I can still tune and play with my current 4s packs but if I ever want a quick speed fix I can throw in 5s.
I will add make sure you understand running a boat outside of the manufactors specs is your own risk...Comment
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31 mph huh? crappy.... now youre gonna do what?!?! i dunno, yours seems like a lemon...Comment
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Hmm, Darin's recommendations are slightly different(bigger) but I know both you guys know your sh
and I'm fully aware with running out of spec. I doubt I would even be eligible for warranty or anything since I bought it second hand. I'll keep an eye on temps and if I pop the ESC, oh well, excuse to upgrade.
???
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Yes those props would work on 4s. I myself never ran larger then a m445 on 4s but I'm sure the BJ motor will swing those bigger props on 4s... To run 5s you should scale back the prop. I never had any issues running 5s but a guy not too long burned his esc up on 5s with a m445. Everytime I increase the voltage I normally decrease the prop a little until I know the system can handle the load.Hmm, Darin's recommendations are slightly different(bigger) but I know both you guys know your sh
and I'm fully aware with running out of spec. I doubt I would even be eligible for warranty or anything since I bought it second hand. I'll keep an eye on temps and if I pop the ESC, oh well, excuse to upgrade
*Thanks for the compliment, but I am sure Darin has forgotten more then I've ever known....Comment
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nope. why do you have to switch props and batteries to break 31mph? thats ridiculous....Comment
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The stock motor is only 1500kv and on 4s his rpm is very low. Plus the prop he is using is in the 40mm range. You have low rpm and a small diameter prop it's running the way it should be. JMO of course. On 4s stick a bigger prop on it and take advantage of that motors torque...Comment
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ok, last thing that popped into my head as a possible cause for my speeds: Strut/drive dog gap. I'm at 1mm per the manual(set with a feeler gauge). I've read many people recommending leaving a gap that is the same diameter as the flex, which is certainly not 1mm. Thoughts? what are others running on their MG's?Comment
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Yea I run thickness off cable on everything I runComment
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PROBLEM SOLVED! and the culprit was.......... dog/strut gap. PB needs to update their manual! at the 1mm recommended gap must have just been too much friction. I opened it up to maybe 3-4mm and got 33 on my venom batteries today. so with good batteries I should be at 35/36!!
oh the only other thing I did at the same time was I also balanced/polished the stiletto prop. but I'm confident the strut gap made the big difference. not the balance/polish.
I'll be staying 4s I think. figure with a prop I can get close to 40, and that's plenty for me. don't want get so fast where I can't drive it without risking a blowover. I think I'll go with the prather 220 as it seems to be kind of in between both of your recommendations.Last edited by PDR447; 03-01-2011, 10:17 PM.Comment
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Ran with my prather 220 yesterday and got 40 on GPS. Temps on everything were about 100 so I'm very happy with this setup.
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