heat issue

[toddilgen]

i ran my super vee today and my batteries are getting real hot, like 150-155 degrees. any suggestions on how i can get my temps down? my set-up is, stock motor (motor temp is 165degrees), stock speed control, 4s lipos, and a prather 225 prop. is that motor temp to high also? i need help please, new to fast electrics.

[RiverRat]

That motor temp is way to high. You need to open up the pickup hole in the rudder

[toddilgen]

i thought that thing was to small! what do you do to open it up?

[NorthernBoater]

Go to a smaller prop to keep your temps down. Start with the 40mm carbon.

[toddilgen]

will a x440 work?

[NorthernBoater]

The x440 will work.

[Fluid]

The problem is not inadequate cooling - it is too high an amp draw. The LiPos deliver a lot more power than NiMH cells, so you have to either prop down, or limit your running to ~2 minutes. As has been said, prop down. The x440 will give a lower amp draw and longer run times, but less speed too.

In all probability the water flow is adequate to cool the motor and ESC with reasonable amp draws. It does not take a large flow to cool these parts, particularly as the pond water temperature drops this time of year.

.

[Rex R]

also make sure you leave a gap between the drivedog and the strut(somewhere between 1/8" & 5/32"(3-4mm))

[ice329]

Few things to check and do. Make sure the hose is not kinked anyplace. Run a small drill bit in the water pickup to make sure its open, maybe open it a tad. A OSE water jacket for 14 bucks does wonders. Check the shaft to ensure its not binding and keep it greased. Dont run your 7.2v batterys down to far. Prop selection, I feel a CF45 or a X642 is about right and should work to keep temps safe. Also if your running wet it will heat everything. I am a loose fan. Keep the strut even or slightly positive and put the trim tabs slightly positive. Check both with a staight edge. Hold the straight edge even with the bottom of the boat and check it, you might be surprized. Go slightly positive.

[toddilgen]

what is the size and pitch of the stock prop it comes with in the box?

[Fluid]

Few things to check and do. Make sure the hose is not kinked anyplace. Run a small drill bit in the water pickup to make sure its open, maybe open it a tad. A OSE water jacket for 14 bucks does wonders. .This is good advice, but it will have no effect on the elevated cell temperature. Regardless of the motor or ESC temperature, cell temps this high will damage the cells. The more times they go over 150F inside the cell the more damage is done. The only way to reduce cell temperatures is to reduce amp draw or reduce run time.

.

[Steven Vaccaro]

Lots of good suggestions here. I think the prop is way to large. Most guys are running a s215.

[toddilgen]

well i put the stock prop back on in the mean time. that really sucks i cannot run that prop. the boat was clocked at 53mph with that prop.

[ice329]

Prop and running wet will heat everything. Binding will also have affect on battery. Also quality of the batterys and legnth you run them. Even my rock solid IB3600 packs if ran till there almost flat dead would be smoking. Sounds like prop and a few adjustments should help. The other stuff I wrote almost should be done regardless. G/L

[Steven Vaccaro]

well i put the stock prop back on in the mean time. that really sucks i cannot run that prop. the boat was clocked at 53mph with that prop.
Unfortunately you are over working the batteries and motor. Something has to change or eventually you will be replacing both. Or worse yet, overwork the lipos and the boat may burn to the water line.

[toddilgen]

well i opened up the water pick-up, sealed the wood frame with epoxy. installed the ose adjustable trim tabs, ordered the ose water jacket(on the way), and put the boat back together this morning. the driveline is smoother now than it was before. i need all the prop recommendations you guys have. already know about the x440/3, prather 215, and x642. what else you got for me?

[RCprince]

Hey guys, before my cousin crashed his, SV27 (His crazy piloting, going full throttle towards the shore and thinking it's funny) he was running a ammo 2600 kv, Grimracer 45 by 68 prop and 4s....I guess it's different just running SAW's and not all out racing...they motor was the only thing warm....But he got 47.7mph out of it...I think if he had a smaller prop he may have gone faster, because it may have been faster.

[toddilgen]

oh yeah almost forgot i run my batteries i front of the motor. i run thunder power 4s lipos in parrell. i run 2000mah's and i have a set of 3300's am i running these too far forward?

[mr.mauian]

No that is fine to run them up front. I have MaxAmps 8000 mah, which are a good size packs and I run them in front of the back of the motor. It sits way upfront and I have no issues, runs smooth and no hoping or spinouts even thru the wakes. A rule to remember is to find the " CG ".

[toddilgen]

with the stock prop my batteries are down to 115 degrees is that still to hot?

[Rex R]

some might call that over warm yet...how far down are you running the cells and how long? if those temps are from 5-8 minutes of runtime then I would say you have things under control. however if that is what you're getting after only 30 seconds...you may still have a problem

[toddilgen]

yeah those temps are after i run around 5 minutes.

[Rex R]

those temps at the end of the run are safe, worry if they go up.