Best bang for the buck 7.2-7.4 volts single battery?

[CaptPJB]

Keeping at 7.2-7.4 volts ie single battery Lipo or Nimh what is the best bang for the buck? Brushless motor which means changing esc or a slighter hotter brushed motor keeping the existing esc if so which one? Speed 600?

I have no issue using a 7.4 lipo and timing runs to avoid damage to the battery. Presently I run at full throttle all the time with standard set up. When Nimh is fresh performance is ok but after a minute or so it drops off using 2000 Nimh

Peter

[Diesel6401]

Keeping at 7.2-7.4 volts ie single battery Lipo or Nimh what is the best bang for the buck? Brushless motor which means changing esc or a slighter hotter brushed motor keeping the existing esc if so which one? Speed 600?

I have no issue using a 7.4 lipo and timing runs to avoid damage to the battery. Presently I run at full throttle all the time with standard set up. When Nimh is fresh performance is ok but after a minute or so it drops off using 2000 Nimh

Peter

Welcome to the forum. First thing I would suggest reguardless which direction you (brushed/brushless) is change the stock esc out asap. It's just not up to the task. With a speed 600, new esc, diferrent prop and a 2s lipo you may mange high teens, low 20s. I say just go brushless, their are a number of members running brushless set-up here I will help you pick the right combonation. Member Jesse J has the fastest RIO I've seen on video. I sure he'd help you.

O to your question use a lipo!

[CaptPJB]

Welcome to the forum. First thing I would suggest reguardless which direction you (brushed/brushless) is change the stock esc out asap. It's just not up to the task. With a speed 600, new esc, diferrent prop and a 2s lipo you may mange high teens, low 20s. I say just go brushless, their are a number of members running brushless set-up here I will help you pick the right combonation. Member Jesse J has the fastest RIO I've seen on video. I sure he'd help you.

O to your question use a lipo!

Understood about the stock esc. This is "throw down" boat so on a budget is there a HK brushless package that would work?
Not looking for the ultimate just 18-22 mph at minimum cost. Figure stock 15-18 fresh battery. Anything around 18 sustained would be good

Peter

[Jesse J]

shoot for around 3000KV motor a 38-40mm prop and a 120-150 amp ESC your boat will fly! on 2s or 3s you should get mid 20s and mid 30s, respectively.

[Diesel6401]

shoot for around 3000KV motor a 38-40mm prop and a 120-150 amp ESC your boat will fly! on 2s or 3s you should get mid 20s and mid 30s, respectively.

The man has spoken!!!

Thanks for backing me up Jesse

[CaptPJB]

The man has spoken!!!

Thanks for backing me up Jesse

Don't dispute the words of wisdom but that combo with esc is $100 plus the original boat cost. For $200 I can get a modded sv27. I know I just sold one! This is meant as a anyone can use it throw down boat to lead them to the sport

Looking for approx sub $50 tweaks to make the stock boat an 18 mph one if that is possible?
Peter

Best thoughts right now a big 7.4 lipo to keep voltage up over a 5 minute run

[Diesel6401]

This may help

vspec..

your post is honest and well done..

The Rio EP was not designed to be a speed demon.. If that was the case it would have been brushless.

The market for this boat is the new guy that just wants to get the feel for an RC boat and the 2.4 is hobby shop friendly.. do ya know what I mean?

Anywho.. YEP.. its time to MAKE IT ROCK.. mine has went 22 on a brush (Speed 600) motor and 7 cells..

Lets have some fun………

Grimracer CHALLENGE to the go fast guys……..Go ahead.. knock it off the top!

ROCK ON!

Grim

Disclaimer: Modifying you boat will void the warranty.. but I bet you knew that!

[CaptPJB]

Went to run the boat again last night and no motor although rudder works OK. Ran power direct to motor it spun up so it looks like the ESC is the culprit.

Boat is two months old but sending it back for repair would cost more than buying a new ESC from Aquacraft but I don't think that is the way to go in the long run. Anyone know if I I have to send the whole boat back or maybe just the ESC?

Anyway I guess it means upgrade time is coming sooner than anticipated I will continue to search forum for economical ESC and motor combo that gives a little more performance.

How does one remove the radio box to access the ESC by the way, does the whole thing come out or do you remove the servo and radio then the wood floor?

Peter

[CaptPJB]

Good news Aquacraft is going to send new ESC still would appreciate some hints how to get to it.

[Diesel6401]

Good news Aquacraft is going to send new ESC still would appreciate some hints how to get to it.

i left mine in the boat, too much of a pain in the a$$ to get out.

[chummer]

It's not hard to remove at all. First remove the servo and then the wood base will unscrew. Cut any connectors from the esc and pull it out. Don't leave the old one in the there. Take the time and remove it and do the job right. I removed the stock esc on 4 of these boats and I did not find it to challenging at all. I replaced it with the pro boat esc. well worth the extra expense.

Hope this helps...

[Diesel6401]

It's my rescue boat so im lazy with it.. Charge, lube and rescue!!!

[CaptPJB]

Thinking of going with an S600 motor for perhaps a little more speed, can some one tell me if I can run the standard prop or do I need to drop down to a 38-40mm?


Peter

[tunnelvision]

Thinking of going with an S600 motor for perhaps a little more speed, can some one tell me if I can run the standard prop or do I need to drop down to a 38-40mm?


Peter

Fun motor definitely faster than stock. I just put in the S600 with 7 cells and a xl-5 esc. It goes pretty good with the stock prop. Run about 7 minutes tops or it gets to hot. 10 min warm on 6 cells and a 7.4 lipo for 5 minutes and that was fun too. Removed one of the rudders and did not affect the handling much if at all. Also, upgraded to a .130 octura flex, teflon liner and brass stuffing tube. Will post a pic if I can find my camera.

This is a fun boat but I am getting the itch to go brushless. Have an extra pro boat 2900kv, 60amp seaking and a stainless 34mm prop just sitting there...

[CaptPJB]

Was thinking of this motor with standard prop mainly 2s use occasional 3s.
Any and all comments appreciated. Was looking for a "zippy" Rio but not wanting to get in to the torque roll thing
http://www.hobbycity.com/hobbycity/s...idProduct=6525

My thinking was standard prop is relatively big so need low kv and an 80-90 amp esc HK esc would be OK.

Peter

[Diesel6401]

Was thinking of this motor with standard prop mainly 2s use occasional 3s.
Any and all comments appreciated. Was looking for a "zippy" Rio but not wanting to get in to the torque roll thing
http://www.hobbycity.com/hobbycity/s...idProduct=6525

My thinking was standard prop is relatively big so need low kv and an 80-90 amp esc HK esc would be OK.

Peter

The KV you have selected is way to low, rpm is only 8k on 2s, and 13k on 3s. Way to low, you need to aim for around 22k - 30k for sport boating or just messing around. You need a 3000kv motor in that range like Jesse stated above.

[CaptPJB]

The KV you have selected is way to low, rpm is only 8k on 2s, and 13k on 3s. Way to low, you need to aim for around 22k - 30k for sport boating or just messing around. You need a 3000kv motor in that range like Jesse stated above.

Thanks for getting me back on track obviously my kv math was off, was thinking a lower Kv = bigger prop but missed the point, 3000 x 8 = 24000 on 2s

Peter

[Diesel6401]

Thanks for getting me back on track obviously my kv math was off, was thinking a lower Kv = bigger prop but missed the point, 3000 x 8 = 24000 on 2s

Peter

What's the 8, where did that come from?

Rpm is Kv x Voltage. So a 2s lipo is 7.4 volts a 3s is 11.1 volts (3000 x 7.4 = 22,200), (3000kv x 11.1 = 33,300)

Lower KV you can run a loger prop, but you need more voltage for the motor.

[CaptPJB]

Was just rounding up numbers too lazy to do he math at 7.4 besides which a 7 cell nimh is 8.2 so just took 8 as an average as I run both types of batteries.

Thanks I am clear on kv and rpm.

[Diesel6401]

Was just rounding up numbers too lazy to do he math at 7.4 besides which a 7 cell nimh is 8.2 so just took 8 as an average as I run both types of batteries.

Thanks I am clear on kv and rpm.

Copy, I understand now.

[CaptPJB]

Can someone tell me if the stock ESC will run a S600 on 6 cells 7.2v without expiring?
Looks like Tunnelvision changed his ESC to xl-5 not sure if it was because he had it or needed it.

[Diesel6401]

Can someone tell me if the stock ESC will run a S600 on 6 cells 7.2v without expiring?
Looks like Tunnelvision changed his ESC to xl-5 not sure if it was because he had it or needed it.

The stock esc will not handle a s600, it barely handles the stock motor. I run a xl-5 myself reason being it is waterproof and can handle the load. I would imagine it can handle the s600 with no problem. Run the stock esc with that motor and it shouldn't take long before

[CaptPJB]

The stock esc will not handle a s600, it barely handles the stock motor. I run a xl-5 myself reason being it is waterproof and can handle the load. I would imagine it can handle the s600 with no problem. Run the stock esc with that motor and it shouldn't take long before

Upgraded to S600 motor and ProBoat ESC. Presently running stock prop.

Runs well on 7.4 lipo after 5 minutes temp is 117 F in warm Texas water (around 86 F)

On a 6 cell NiMH 105 F after five minutes.

The lipo option gives me what I was looking for in consistent adequate speed as the NiMH drops off as the run progresses but is 117 F too hot?

If it is options appear to be 40mm prop ( not sure what this would do to speed?) and or new cooling jacket, Presently using the stock coils that don't look too efficient compared to a silicon jacket?

What prop are you using with the xl-5 Diesel?

Any comments appreciated

Peter

[tunnelvision]

Haven't had a chance to get video but was able to test today with a different setup. I used a 36-50 2300kv motor, 60 amp seaking, 4000mah 3s lipo, and x435 prop. After 7 minutes of stop and start running, temps were all under 85. I think this setup is a winner. Way faster than 2s on the 2900kv motor. Can't wait to test my Grim 36mm, I hope I can get a few more mph without torqure roll. There was no torque roll at all here but I am running a tad wet. Need to find the right CG and get more 3s batteries!

[CaptPJB]

Interesting about the 3S set up being better, bears out the saying, more volts less amp runs cooler.

Curious to hear how the Grim 36 will do.

Peter

[tunnelvision]

Alright had a chance to take some video the other day. It was 52 degrees outside and no wind. Ran the Rio for over 12 minutes on my 4000mah 20C 3s lipo and there was still more in the pack. All temps were around 90 to 100. Got my grim prop which I will try next, this vid is with the x435. Tried moving the battery back but boat is still running too wet for my liking. I have room to move it back so I think I'll try that next. Also, ran my Supervee 27R which is in the vid as well.

Might go back to 2900kv on 2s with the grim prop and see how that runs. I have had a lot of fun messing around with this boat. Its held up well.

http://www.youtube.com/watch?v=SZwxMMSfCK8