CRD

My Feedback: (5)

they were not that weak because I have 4 packs and only use 2 of them and they got low very quickly, but I used the other 2 packs on my car and it gave me a good running time, and all 4 four charged the same day. I think the ESC drains a lot of power of the setup eats to much amps don't know I only got 3-4 min after I noticed the voltage cut off.

CRD

My Feedback: (5)

I'm giving up in a lot of boats that I have , but not on my proboat jet ski, that one have never fail me, I will put the new brushless setup to the jet ski and upgrade the prop to a metal one. Will see what happend, Self-Righting is the best.

Blackjack52

Cars and boats are 2 diff things. V drop in NiMh (especially Tenergy) after 2 wks will not be able to support performance like you describe. I doubt the boat would even plain out.

Any stock SV will not do 44.5 on NiMh with that size prop. If so, I think Grim would have changed the setup. Smaller prop on nitro due to rpm....I would think. Also, tight water forces a wetter ride = slower speeds and way more heat. This design needs at least light chop for best results. This hull is also very unstable at the speeds you're saying had a little instability.

ctonez

not worth the time to put forth any arguments here, and hey maybe the nitro hull is different. I've had my SV hull up to 48.3 on my GPS, so I know it's not impossible...but stable? nope. For CRD's sake, though I will say I was pushing 45 in testing on flat water with no other boats. That same setup does near 50 on light chop though and is crazy unstable.
but I fight the stability issue once I get around 40+ with every setup I've run or have seen run in the boat. At the Nationals SV27 races it was becoming a joke around the pits as to how many SV's were upside down at the end of the races...and that was with Nimhs...and guys there were top notch drivers (Grim, Russ, Buass, Darin Jordan and others)
In Pmono at the Nationals the SV's were also usually upside down...instability happens, especially in race water...not sure what my point was, but who cares really...just put the 18 cells in and gun the throttle in the tub and have the wife film it....PLEEEEAAASSSEEE!!!

CRD

My Feedback: (5)

I'm not saying the boat was stable, it was still going up and down like when I had it nitro with the CV-R engine. http://www.youtube.com/watch?v=liGu9FJz2Ys as you can see in the video it was very unstable , after that I trimmed down the prop shaft and bended a little the taps, but nevwer tested again until now with the brushless motor and the speed was almost the same or even faster but the hull wasn't bumping up/down as much. The water was like a glass , I asume if I test the brushless setup on the same lake I ran the nitro version I will flip it up again.

CRD

My Feedback: (5)

I will do it but with the pro boat jet ski and the brushless setup on it, just for fun. but don't say anything to my wife because when she sees the disaster she will say something on video to me hehe.

bzinfinity

All that work just to strip the parts and switch to something else?

I think you should work with it man, attach some outriggers to the sides like a Trimaran and get that SOB up to 50 or 60MPH =D.

Blackjack52

You got 48mph on stock/spec 12c NiMh? With what prop? Are you sure there aren't fumes lingering in the pits. I know these speeds are attainable on lipo (though very very unstab like you said). Grim got controllable 38mph on x440/3 spec setup. I'm tapped at mid 38s, little chop, on m445.

Last I heard, SVs were tearing up the courses pretty well; taking trophies.

CRD

My Feedback: (5)

Here is the video of the ProBoat Riptide on the bathtub I had to recorded myself, my wife will kill me if she sees this video. I had to mop the floor before she came back. I will be using the stock SV27 ESC and 14.4v or the max the SV ESC can handle with - 3800mAh.

The test was made with a 11.1v - 2200mAh lipo, it sure haves more power than the old brushless setup I had on it.

VIDEO ON BATHTUB http://media.putfile.com/ProBoat-Rip...rpmv-Brushless wait for video to be converted by putfile.

CRD

My Feedback: (5)

I got 44.5mph with a 3,200 rpm/v motor and 100amp ESC, and stock NITRO 3 blade prop. NOT THE STOCK PROP from the SV27 Brushless version. Nitro and Brushless version have different props. Nitro is smaller wich equals less stress on the motor.But I got more RPM's than the stock motor. the 44.5mph were made on the top performance of the boat before the battery got low.

on a side note: I tested the MOTOR with the SV27 ESC and the 11.1v lipo on my bathtub and it drained the lipo in less than 1 min.

This motor is rated:

kv : 3200rpm/v
Weight : 215g
Length : 50mm
Diameter : 35.8mm
Shaft Diameter: 3.2mm
Idle Current : 2.39A
Resistance : 0.0115
Max Current : 60A
Battery : 4-5LIPO I used a 3S lipo

I think the running time at the pond was to little because the motor needs 14.8v minimum, I had 14.4v then the power droped to 12.9v and the boat lost lots of power. Darn it I didn't remenber that. I should try it with 18 cells but to late.

ryan_t888

I though 12 cells was pushing it. It's a good thing you didn't try 18 cells. Maybe you should toss that .18 back in there. You can't do as much damage to an engine than a motor.

Ryan

Blackjack52

I was expecting 40mph+ with the 12cells setup and smaller 3 blade prop. and I got 44.5mph

Now it's LIPO. 44.5mph sounds right now..although you won't compete well against the rest of the field. By yourself it'll be fun.

SV27dayton

Where does it say LIPO? (12 cells). I've been keeping quiet but I don't believe this. Spend all that time and money and use have ***** charged batts and go 44.5 on the wrong prop and say "well I'm going to give up on this." I don't buy it. That GPS looks strikingly like mine sitting in the passenger seat of my car when I get home after forgetting to shut it off.

No - I'm going to make a few adjustments, try it with the tabs down and the bats back. Or even "I'm going to see how it runs with the batteries charged"

Where's that lake where you ran it as a nitro boat? That looked nice enough.

Too much work to just quit.

Blackjack52

Maybe I was using too many meds while doing all that testing w/ props and packs on tight/loose water. Dang.....now I have to do it all over again.....it's obviously all wrong.

Now I don't.......whoooh. Thanks SVDayton for confirming what this boat is really capable of on packs/prop/water.

SV27dayton

BJ,
I'm not so much confirming as denying. He's got lots of go fast in that boat. Why would you quit before at least flipping it once. None of it makes sence. I'm must saying if it looks like a duck, and quacks like a duck.......

CRD

My Feedback: (5)

I'm quiting becuase when I had the nitro setup and didn't like the jumping it had at full throttle. I decided to sell it but like any other R/C even new you will loose $$ re-selling it. I decided to put this brushless motor wich was for another project on this SV27 just to tested, I sold the .18cv-r engine so I had the hull to play with it.

After playing with it at the pond, I noticed that even if I put a turbo engine or 2 brushless motors in it , I'm still going to have control problems, flip ups, etc. That's why I don't care about keeping the project going. The setup look much nicer on my cheap proboat jet ski . the gps in the other hand have the correct readings, I stoped the timer at soon I disconected the batteries at the pond, plus going home I have to get on the highway and is more than 44.5mph there. The SV hull is almost sold and the brushless setup is in another body it was fun.

CRD

My Feedback: (5)

Do you have the stock brushless motor? Mine and yours are totally two different motors, props wont work the same or voltage power.

Blackjack52

He sure does. And I commended him.......at first. And yes, it looks like a duck, but it isn't quacking. At least not the way it should be.

If Grim was able to get the setup going 40+ as spec, then I would expect that.

How well does the boat corner with CG (4 AAs, GPS) shifted strbrd? Also, those packs look small to be NiMh, all the way forward (which makes sense being forward if lipo). But then the lipos were drained <1min in the tub, and the NiMh had 2 wk old charge.

First we have data being posted saying it was on NiMh, then lipos, then NiMh on half charged packs, then running half charged packs on a setup that requires more V than the packs (while still breaking 44mph).
This motor is rated:

kv : 3200rpm/v
Weight : 215g
Length : 50mm
Diameter : 35.8mm
Shaft Diameter: 3.2mm
Idle Current : 2.39A
Resistance : 0.0115
Max Current : 60A
Battery : 4-5LIPO I used a 3S lipo

I think the running time at the pond was to little because the motor needs 14.8v minimum, I had 14.4v then the power droped to 12.9v and the boat lost lots of power. Darn it I didn't remenber that. I should try it with 18 cells but to late.

ryan_t888

Hey BJ, did you pick up this 3200kv motor as well or am I just confused?

Ryan

Blackjack52

Yes. I know the motor you're using has higher rpm. But you need the V in order to make that happen. On top of that you're doing all this with a smaller prop.

How much cavitation did you have?

Blackjack52

Ryan,
Yes.

Are you confused yet? I am.

Also, to use the rpm, if he had the V for it, wouldn't propping up (up from 37mm) be needed to utilize the rpm band of this motor?

ryan_t888

Am I ever! Things happened so quickly and now it's all apparently gone?

More KV while all else is equal, less prop

Ryan

Blackjack52

More KV while all else is equal, less prop

Thanks.

ctonez

Sorry...I've been away.
My post reads 48.3 on the SV27 "hull".

Not stock by any means, at least not since the Nats.
Lipos indeed.
Ammo 2300kv
440/3
Cuda 125 ESC

I blew up everything stock at Nats trying some untested stuff in P-Offshore...had to run it in Pmono next day, so slapped in what I had...won a heat in Pmono, but rolled 3 times in doing so and flipped over the start/finish for the win. Nats was some tough water for SV27's though...and shhhhh! don't tell anyone, because I don't wanna jinx it...but go to the PSFEMBC website and check the mid season points to see how my SV27's are doing
To clarify - My green SV is bone stock, and I've had it at GPS'd @ 38.6 (controllable) with nimhs.
My Yellow SV - not so stock (see specs above) and GPS'd @ 48.3 but a leeeetle unstable (see below).

-Corey

Photo credit - Jerry Dunlap

SV27dayton

In short it sounds like a bunch of money and a little time were put into making the boat handle better.
remove motor
install state of the art overkill brushless hipo setup.
(did you adjust the trim tabs and rudder?)