Jan 21, 2007, 01:12 PM
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Madison, AL
Joined Sep 2006
159 Posts
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tGrant, If you go SV27,
If new to rc period, I would recommend doing some homework on lipos first. That way you can make an informed decision about whether you want to use NiMh or lipos. I'm talking from the safety aspect. If you decide lipos, make sure you get a fire safe storage container (ammo can) and a lipo sack (fire proof sack), and don't store in you home.
The packs I've heard of people using are +4000mAh rating, Already built....just plug them in. I'm not sure about the 2S or 3S config. You'll have to look around about that. Hint hint: I recommend looking in more than one place for these answers. Keep in mind, for competition purposes, this hobby is going into the lipo realm this year.
Either way, get a charger that can charge Nixx, lipos and possibly l-ion. A dual charger with at least 10A output (and can charge at least 2 packs at a time and has a dc converter with it for field charging)........look at the MRC977 Superbrain (this has a tendency to false peak.......it cuts off the charge early and you have to monitor the cycle.......which is good anyway).
I've done alot of testing with props on the SV27 with 12cell NiMh and have found the carbon fiber (CF) K series Graupner 48mm (0 cav, unless you modify it you have to slow down for cornering) to be very aggressive, to say the least. This will literally launch you out of the water (croc roll) and yield 35-high36 mph on light chop and a good setup (140F batt temps and 125F motor). You will have to monitor batt temps (don't go over 145F) and make sure you have a good setup. For the metal props......I recommend M445 (.5' cav and +37mph, excellent control wide open (WOT) throttle and cornering). (129F batt temps and 110F motor). The x642 is pretty fast also with mid 36mph (0 cav and great control WOT and cornering). The X440/3 (1-2' cav) will give you +40mph (Jallen got +42mph) with great cornering and WOT also. If you have alot of turns in your racing or sporting around, like an M-course, maybe go CF45 (34mph but good handling) and CF48, or metal props (much beter) with the M445 or X642. All out oval, go as fat as possible, try the X440/3.
To ensure propper setup (prop, your trim tabs, and strut position) you have to monitor temps of batteries, motor, and ESC. ie. If you run a CF48 in a stock SV27 and don't have the setup correct (like running the boat too wet, or on dead calm water with wrong setup), you can easily fry a pack or two in half a run. Make sure you always get batt temps with an IR temp gun when trying new props or trim tab/strut settings.
If you're NOT new to boats ignore this.
Hey, I was new to boats back in Sep 06. All of this isn't meant to scare you, but you can't just go fast in rc boats by throwing a prop and batts in. This is meant to give you an idea about what's required for setting up your boat, and will enable you to enjoy it much longer. You have to make sure the boat is setup for the water conditions and that the prop won't draw too much from the batts at one time.
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Last edited by Blackjack52; Jan 23, 2007 at 08:36 PM.
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