Small motor/battery

[chevy42083]

Ok, so I'm debating a small build.... scale and price;-)
It'll be 1.9 based, but very short wheelbase. Use alot of parts I have laying around, but I want a new motor and battery to keep the weight down and fit the small build. I'll probably run an LRP runner that I have cause it's the smallest esc I have. It'll be a slow rock racer, but not a super slow crawler. Total package comparable in speed to a 55 or 65t lathe, but don't need all the torque.

Battery...
I'm thinking about going down in battery size from all of my 6cell stick packs to fit the chassis/wheelbase I want. I need to get some measurements to get the exact length, but I'm talking under 3in length in battery, and it'll be opposite side of the chassis as the motor, so motor width-ish. Basically, the battery will define the length of the chassis (battery length + space to turn the tires).

Motor...
What would my options be for small motors? It needs to mount like a conventional 540, and will have no tranny, just a spur and pinion. I'm looking for something along the lines of a 55 or 65t lathe motor, but don't need the torque, so I wondered if theres a smaller motor that'll shed the un-needed torque, and weigh less as well as be smaller. 380 maybe?

Any suggestions on motor/battery? Price is DEFINATLY an important factor... just building a fun rig, nothing to compete with. Mainly just wanna try some ideas.:lol:

EDIT: I know NOTHING about anything outside of 1/10 540 motor and 6cell stick packs.... so boat, airplane, 1/18 etc are all foreign to me.

EDIT again: ESC specs...
Voltage Input: 4-6 cells (4.8-7.2V)
Typical Voltage Drop: @20A 0.320V
Rated Current: 60A (transistors rating at 25°C junction temp.)
Rec. Motor Limit: over 18 turns
BEC 5.0V

 

[chevy42083]

As for motor, Would a motor intended for a boat be a good source for a torquey small motor? Planes pretty much just run high rpm w/ little torque.... which would require lots of gear reduction?

What about something along these lines for a battery? Would 900mAh last a decent amount of time? Would I be better off getting a lower voltage battery with higher mAh? The 2in length would be awesome, but I'm sure I could go longer.

Description:
This is the 7.2V 900mAh NiMH Battery for the
Hobbico Flyzone Red Hawk, HCAA1960.

FEATURES: 6-cell 2/3A size with Red shrinkwrap
Miniature Kyosho type connector

INCLUDES: 7.2V 900mAh NiMH Battery for the Hobbico Flyzone Red Hawk

REQUIRES: Charging with one of the two chargers supplied with the Skyfly

SPECS: Length: 2" (50.8mm)
Width: 1.3" (34mm)
Height: 1.1" (29mm)
Weight: 4.6oz (130mm)

or...

This is the AquaCraft 7.2V 1100mAh NiMH Battery for the
Hobbico Reef Racer 2 Boat, HCAB14**.

FEATURES: Six cells shrink wrapped with wire lead and Tamiya style
connector preinstalled

INCLUDES: One 7.2V 1100mAh NiMH Battery for the Reef Racer 2

REQUIRES: Charging for 30 minutes and installing in boat
If charger is needed use, AQUP9929

SPECS: Length: 2.2" (57mm)
Width: 2" (51mm)
Thickness: .67" (17mm)
Weight: 4.6oz (132mm)

 

[JohnRobHolmes]

A little outrunner may be your best bet if you are willing to use brushless. Otherwise I have found 380 cans to overheat from the lack of surface area for heat dissapation. How fast do you want it, and will you be crawling with it?

 

[chevy42083]

Trying to avoid brushless so I can use the esc I already have. My Mamba Max is already gonna pull double duty in my T4 and crawler (bought the runner for the crawler, then saw some of the locals running mambas and realized wanted that). Don't want the mamba pulling triple duty, and can't afford another brushless esc. Besides, the Mamba is bigger than I wanna try to fit in the new rig.

My 65t lathe in my tc3 on BFGs is the only thing I have to compare it to... that was about the speed I want. It was running 7.2volt stick pack. It's enough to creep, but also get a little wheel speed. Maybe stock motor in a stadium kinda speed? Obviously more would be more fun That's roughly the speed I want... kinda hard to quantify speed. I was wondering about the little outrunners, but just not in the budget... if the rig works as planned, then that would be a GREAT upgrade later.

Like I said, not TOO worried about torque... especially if i keep the BFGs, they don't have traction worth a crap, and the rig will hopefully be very light.


EDIT: what, no one with an 1/18 experience? Am I looking for too much in a small package? I'll stick with the 540 if need be, but I gotta have a smaller battery to make this thing work.