Yusa buggy? - Page 4 - RC-Monster Forums

t-maxxracer32 · 11.07.2007, 10:25 AM

Quote:

Originally Posted by BP-Revo

Well, because current is the contributing factor to heat generation. The less current used, the less heat produced.

Since watts is the power output of a vehicle, and watts = Voltage X Amps (current). When you up the voltage, current can fall and watts will stay constant. Less current means less heat (as well as more runtime, if you want to think of it that way).

To produce 1000 watts, a 10V setup would have to pull 100 amps. However, a 25V setup would have to pull just 40 amps.

ok so i was kinda right.

keeps heat down and improves efficiency

11.07.2007, 02:31 AM

Because motor rpm isnt the only thing that determines the systems power output.
From what I understand, and there are much more knowledgeable people than me on this board, amps are what cause heat buildup in most ESCs. Also, the amp load capability of the battery can be a major limiting factor in the total power output. So keeping the amp load low is important for efficiency and longevity of everything in the system. Since power is determined by amps and volts, the only way to lower the amp requirement without losing power is to also increase the voltage. It also works the other way, the only way to increase power without increasing the amp load is to increase voltage.

BP revo beat me.

11.07.2007, 02:40 AM

So does voltage directly effect motor efficiency? Ive seen people calculate power output by multiplying the motor efficiency by the watts drawn from the battery. Then its assumed that the extra 10-25% is turned into heat. If less amps also means less heat, is that any different from using a better motor?

tashpop · 11.08.2007, 06:46 AM

i just bought this.

its the onroad car yusa 1/8th scale. i may have to buy a single speed center diff for the conversion, but i always wanted a 1/8th buggy converted rally car, and couldn't pass up $79.

btw, he has another buggy for sale.

I Trust Tyler · 11.09.2007, 03:17 PM

Quote:

its the onroad car yusa 1/8th scale. i may have to buy a single speed center diff for the conversion, but i always wanted a 1/8th buggy converted rally car, and couldn't pass up $79.

btw, he has another buggy for sale.

Hey, let me know how you like it, im always looking for a rally chassis, its what got me into the hobby, but i have a hard time finding anything

stampedeproject · 05:44 PM

OK guys Yusa Buggy #3 is on it's way.

The ultimate head to head testing:

1 - Nitro Buggy
1 - Direct NTB (Nitro to Brushless) Conversion that retains disk brakes
1 - Plate (RC-Monster style) NTB conversion that has the motor handle breaking.

So far here is the propulsion I have to test.
Brushless
Neumotor 1515/1Y
Neumotor 1512/2.5D
Hacker C50S Maxx
Hacker C50S 11L
Medusa Research 2200Kv 10th scale motor with heat sink
Novak HV4.5R System
Castle Mamba Max ESC
I am sure a Tekin will end up there somewhere.

Nitro - We'll see if they all fit
Nitro Star F4.1
Nitro .26 Hotbodies
Traxxas 3.3R

Should be a fun but very long test.

Under penalty of death and divorce my wife assured me that this would be the last and final Yusa buggy I purchased. :(

**new guy here. I bought the last Yusa buggy -** 11.19.2007, 07:56 AM

and his .27 Infinity motor to go with it. Ill get it together and post pics.. :)

11.19.2007, 12:56 PM

hey B15.. you ever get the parts from larrys for yours? How were they??
Frank

rcjmaxx · 12.08.2007, 04:40 PM

Quote:

Originally Posted by stampedeproject

OK guys Yusa Buggy #3 is on it's way.

The ultimate head to head testing:

1 - Nitro Buggy
1 - Direct NTB (Nitro to Brushless) Conversion that retains disk brakes
1 - Plate (RC-Monster style) NTB conversion that has the motor handle breaking.

So far here is the propulsion I have to test.
Brushless
Neumotor 1515/1Y
Neumotor 1512/2.5D
Hacker C50S Maxx
Hacker C50S 11L
Medusa Research 2200Kv 10th scale motor with heat sink
Novak HV4.5R System
Castle Mamba Max ESC
I am sure a Tekin will end up there somewhere.

Nitro - We'll see if they all fit
Nitro Star F4.1
Nitro .26 Hotbodies
Traxxas 3.3R

Should be a fun but very long test.

Under penalty of death and divorce my wife assured me that this would be the last and final Yusa buggy I purchased. :(

Hey Stampy,hows the testing coming along.......?

stampedeproject · 12.08.2007, 07:59 PM

Quote:

Originally Posted by rcjmaxx

Hey Stampy,hows the testing coming along.......?

f$$450%^*(........ ARGGG Thanks for reminding me how far behind I am on projects.

See this I am burnt out at the moment.
http://www.stampedeproject.com/Ode-t...apy-Buggy.html

My life has been nuts lately. On top of a work promotion that has taken a ton of my after hours time, the holidays, family/company, articles that have taken priority or have taken way way to long, life and this idiot at our mall here in Omaha, I am pretty physically and emotionally burnt out at the moment.

I did get two of the Yusa's set up and running. The direct conversion and a gas versions are done. Waiting on servos for the last as well as fab'ing a servo mount plate. Mike offered to throw something together, but I know he is really busy with the holidays, so I really don't want to bug him.

I just picked up a Proxxon $350 mini-mill that even after just a couple little jobs, is blowing me away. It accepts all my existing Dremel bits so you can even do some cool stuff like precision sanding.... but that's a different story all together. "IF" I have some time it shouldn't take me more than an hour or so to whip out a motor mount plate.

I am really excited about this project if I can get some freaking shop time. Initial test showed that a relatively low powered ESC might be able to run the buggy just fine - such as the new Castle Sidewinder system with a low KV motor such as Medusa Products 2200Kv standard 540 sized motor. The big BUT is that the ESC cannot handle braking or reverse, it's just too stressful.

Realistically it will be well after the Christmas before I can dive back into it. We will see.

rcjmaxx · 12.23.2007, 01:21 PM

Quote:

Originally Posted by stampedeproject

OK guys Yusa Buggy #3 is on it's way.

The ultimate head to head testing:

1 - Nitro Buggy
1 - Direct NTB (Nitro to Brushless) Conversion that retains disk brakes
1 - Plate (RC-Monster style) NTB conversion that has the motor handle breaking.

So far here is the propulsion I have to test.
Brushless
Neumotor 1515/1Y
Neumotor 1512/2.5D
Hacker C50S Maxx
Hacker C50S 11L
Medusa Research 2200Kv 10th scale motor with heat sink
Novak HV4.5R System
Castle Mamba Max ESC
I am sure a Tekin will end up there somewhere.

Nitro - We'll see if they all fit
Nitro Star F4.1
Nitro .26 Hotbodies
Traxxas 3.3R

Should be a fun but very long test.

Under penalty of death and divorce my wife assured me that this would be the last and final Yusa buggy I purchased. :(

I see Hacker has a new motor out there,C50S with a 2500 kv,will this be added to your comparo?

Arct1k · 09:31 AM

P = V * I

V = I * R

Hence Power = Amp * Amp * Resistance

Motors have fixed resistance (Ignoring heat changing the resistance of the coper wire ).

Therefore Power loss (aka heat generated) increases with the square of the increased amp draw...

This is why people go for increasing the voltage and decreasing the current to maintain a fixed power

11.20.2007, 01:38 AM

I did also, read near the bottom of the third page.

11.20.2007, 07:32 AM

ok missed it.. Thanks..

Quote:

Originally Posted by B15

I did also, read near the bottom of the third page.

stampedeproject · 11.26.2007, 09:04 PM

Just received the Thunder Tiger EB4 S2 "PRO" RTR from RC Car as payment on an article. This looks pretty much part for part a Yusa. The bad news and very sad part is that the Yusa is a much higher quality build. The EB4 doesn't even have sway bars, or adjustment nuts on the links. It's like Thunder Tiger took a decent cheap roller chassis and then stripped it of everything good.

Feel I got a better deal on the Yusa's by the moment.