Maiden Pursuit 32 : not good. ultra high amp draw. toasted lipos : Running too Wet?

[iop65]

I'll vouch for the setup. It's pretty similar to the setup I run in P. You can run the motor up front. If it's done correctly the extra cable makes no difference. On the Pursuit hulls if the strut is very low it absolutely will walk donw the straights. In fact, I had to re-drill mine to raise it a tick. That's how the one Doug Junior won P mono at the nats was setup.

Nice thing about a front mounted motor is that everything can be deep in the keel.

so spinning an extra 15-20cm cm flex at +/- 25000 rpm : no extra watts needed you say ?
nice that he mounted that heavy esc so low in the hull right?

i hope i'm wrong but i can only see some velcro to hold down the esc and lipo's ?
if so ,going to look nice inside after a crash ,again i hope i'm wrong

with all respect and sorry to disagree ,but this not the way i would have gone

[iop65]

this is what i did ( not finished)

P1020486.JPG

as you can see :also used a wet well

[T.S.Davis]

I have a 26" Rocket hull setup like yours. I don't like the bend I needed to get my shaft to work. It does work. Absolutely it does. Just too much for my liking on that particular boat. May have been too small to do what I was trying.

I've done it a multitude of ways. We have a club member that does really well with his Pursuits that builds his almost exactly as you show. Motor at the back. Batteries in the keel. On yours I would place the speedo on top of the batteries and strap them in together. Place as much weight on the center line of the boat as possible.

My limited setups have the motor up front but they're wire drive.

I'm not really saying either is better or worse. I'm suggesting that done correctly the difference is negligible. If done poorly, the longer shaft will whip in the stuffing tube. I've screwed that up myself.

[JackBlack26]

Wow, a lot of misinformation in this thread, lol.

He is using 2 different C rated packs. This will cause an imbalance while discharging; different amperage rate.

The other issue is not the hard case packs, but rather the 4mm bullets on them. Many hard case packs come with wire sized for their discharge rate, 12 or 10 gauge wire. Not all have bullets on them, like his do.

Also, most batteries that claim to be over 50C is done for marketing only. I'd love to see a graph of a battery discharging over 250 amps, continuously.

The motor does look to be very far forward. The boat running very wet would definitely cause a high current demand.

[T.S.Davis]

He is using 2 different C rated packs.

Totally missed that. Each pack will deliver different voltage. The higher the amp draw the greater the difference.

[T.S.Davis]

double post....

[ronarcweld]

Agree with the guy who recommended 5.5 bullets you won't have current issues with them. Those 4mm bullets are not for boats as a boat is always under a full load not like a car. As far as your set up its fine next time put the ESC in front of motor so ESC wires can be nice and short. Is this mandatory no just a tad more efficient use of space and short wires are always good. Running wet alone should not have puffed cells unless the nose is actually in the water. lol. I also have to add about batteries, I have had some issues with one out of the four nanoech 6.4's I have it puffed. So cut it open and removed one cell now I use it on a five cell setup on another boat. So really only one cell failed the other two cells are fine but the other three are still kicking. I got new ones from gensace four 5000 3s now seem great but haven't run them enough to say either way but all research led me to them. 50 bucks a pop ain't to bad and I run four at a time in a cheetah on 4092. So I have 10000mah at 22.2v research also steered me away from nanotech they have a "puffy" reputation.

[ronarcweld]

Also yes do NOT mix packs of different c ratings not good. I didn't catch that in the pic the other guy with a good eye caught that. That's a big no go. Allot of people don't really understand electrical and this hobby is all about that, much more so than planes and cars.

[ronarcweld]

Agree with the guy who recommended 5.5 bullets you won't have current issues with them. Those 4mm bullets are not for boats as a boat is always under a full load not like a car. As far as your set up its fine next time put the ESC in front of motor so ESC wires can be nice and short. Is this mandatory no just a tad more efficient use of space and short wires are always good. Running wet alone should not have puffed cells unless the nose is actually in the water. lol. I also have to add about batteries, I have had some issues with one out of the four nanoech 6.4's I have it puffed. So cut it open and removed one cell now I use it on a five cell setup on another boat. So really only one cell failed the other two cells are fine but the other three are still kicking. I got new ones from gensace four 5000 3s now seem great but haven't run them enough to say either way but all research led me to them. 50 bucks a pop ain't to bad and I run four at a time in a cheetah on 4092. So I have 10000mah at 22.2v research also steered me away from nanotech they have a "puffy" reputation.