which battery

[crrdr97]

I have purchased a slow stick and it came with a E-flight park 450 890kv outrunner, Electrifly silver series 25a esc, and two 10x4.7 props along with a couple stock props from the 350 brushed motor. I have a 1350mah 25c 2 cell(10 wh), a 1250mah 3 cell 15c 14wh, and a 2070mah 3 cell 25c batteries. Which one can I use safely with this set up? The 2070mah looks a little big so I'm thinking one of the first two. And can you tell me how you figured it out so I can know next time?
Thanks,
JD

[CHELLIE]

Originally Posted by crrdr97

I have purchased a slow stick and it came with a E-flight park 450 890kv outrunner, Electrifly silver series 25a esc, and two 10x4.7 props along with a couple stock props from the 350 brushed motor. I have a 1350mah 25c 2 cell(10 wh), a 1250mah 3 cell 15c 14wh, and a 2070mah 3 cell 25c batteries. Which one can I use safely with this set up? The 2070mah looks a little big so I'm thinking one of the first two. And can you tell me how you figured it out so I can know next time?
Thanks,
JD

Hi, The 2070 mah 3 cell lipo and the 1250mah 3 cell will work well, a 2 cell lipo will not give you enough thrust with a low 890kv motor, a 1800mah 3 cell 25 to 50C rated will be the best to use to keep the weight down. hope that helps, Chellie

[CHELLIE]

http://www.wattflyer.com/forums/show...=power+systems

[crrdr97]

Thanks. There is a whole lot more to it than rc cars after reading that link! The 10x4.7 prop is fine with the 1250mah 15c 3s right? I don't want to burn anything up.

[CHELLIE]

Originally Posted by crrdr97

Thanks. There is a whole lot more to it than rc cars after reading that link! The 10x4.7 prop is fine with the 1250mah 15c 3s right? I don't want to burn anything up.

That prop will be fine with that low KV motor on 3 cells, look at Heads up RC motor pages, and compair your motor with Jeffs esc, prop and lipo info, I have learned a lot from jeff and his motor pages, also he has the best prices around and $2.00 shipping on almost everything, if you buy from Headsuprc, tell Jeff that Chellie sent you

this motor is very close to what you have, look at the prop, esc and lipo specs.
http://www.headsuprc.com/servlet/the...-Slofly/Detail

Power Up 450 Slofly Outrunner Brushless Motor

SKU: A-536
Price: $17.95
This item is in stock
Quantity:





















The Power Up 450 Slofly is a 2.5 ounce, 880KV, 240 watt, 450 class outrunner brushless motor that works well on many medium to large size parkflyers. It will produce up to 38 ounces of thrust when using a 3 cell Lipo battery. This motor includes an X mount and prop adapter!

The Power Up450 Slofly is a good choice for sport planes weighing 20 to 40 ounces, and for 3D models weighing 15 to 28 ounces. A nice set up for 3D planes would be an APC 10x4.7 prop and the EZ Flite 11.1v 1300 30C or 11.1v 1500 30C Lipo battery. For a sport flyer, you might consider using an APC 10x7E prop and the EZ Flite 11.1v 1800 30C or 11.1v 2200 30C Lipo battery. We recommend using a 25A to 40A ESCwith the Power Up450 Slofly motor. Many of our speed controls come with 3.5mm female connectors installed, so no soldering is needed when used with this motor.
MOUNTING OPTIONS: The Power Up450 includes an X mount that makes it easy to mount the motor in front of a firewall. It also can be mounted on the front of a GWS Plastic Outrunner Mount, making it a drop-in fit for many planes with 10mm sticks.
A 4mm Prop Adapter is included for mounting props.
Propeller test data for the Power Up 450 Slofly when using a 3-cell Lipo battery:
Rotating propellers are dangerous. Please stay clear of prop and wear safety glasses.
APC 11 x 5.5E: 38 oz thrust at 16 amps.

APC 10 x 3.8: 37 oz thrust at 16 amps.

APC 10 x 4.7: 38 oz thrust at 17 amps.

APC 10 x 5E: 34 oz thrust at 14 amps.
GWS EP1060:32 ounces of thrust at 13 amps.

APC 10 x 7E: 34 oz thrust at 16 amps.

APC 9 x 3.8: 28 oz thrust at 11 amps.

APC 9 x 4.5E: 26 oz thrust at 10 amps.

GWS EP9050:26 ounces of thrust at 10 amps.
APC 9 x 6E: 28 oz thrust at 12 amps.
Please be aware that the battery used can make a tremendous amount of difference in the performance of brushless motors. The above data was obtained using batteries in good condition that were fully charged. Thrust and amp draw may be less with the use of batteries rated at lower amp output, and slightly more using batteries rated for higher amp output. Other factors, such as ESC timing and variations in actual motor KV can affect the performance of brushless motors as well. We recommend the use of a Watt Meter to test the current draw of your particular power system, especially if you plan to use a prop that pushes the motor near it's maximum amp rating.
Power Up 450 Slofly Specifications:
Weight = 2.5 ounces (71 grams)
Diameter = 1.1 inch (28 mm)
Motor length = 1.35 inch (34 mm)
Shaft = 4mm x 0.5 inch
Voltage = 7.2 - 13.0
Current = maximum of 18 amps for 30 seconds
KV (rpm/v) = 880
Mounting holes are spaced 16mm and 19mm on center and are tapped for 3mm screws.

[CHELLIE]

Originally Posted by crrdr97

Thanks. There is a whole lot more to it than rc cars after reading that link! The 10x4.7 prop is fine with the 1250mah 15c 3s right? I don't want to burn anything up.

the 1250mah lipo will work, but it wont last very long in flight and wont give you a lot of power for very long, the 2070mah lipo would be better to use, a 1800mah 3 cell lipo 25C would work better as its not to heavy.

Lipo Battery 1250mah =1.25 amps x 15C rated = 18.75 amp Battery

Lipo Battery 2070mah = 2.07 amps x 25C rated = 51.75 amp Battery

Just Remember High KV motor use small prop because a high KV motor will draw lots of Amps.
Low KV Motor use Large prop, as a low KV motor wont draw a lot of Amps like a High KV Motor will.

[mclarkson]

Anywhere from a 1200mAh 3S to a 2200mAh 3S should work fine. You'll have to adjust your CG accordingly.

[hayofstacks]

I have run a 1000 mah 3 cell, several different 1300, 1500 1800 and 2200mah batteries, all 3 cell on my slowstick.

I also currently switch between both the slowfly and sport powerup 450 motors like chelle linked you to. I personally enjoy the sport motor more, but the slow fly is fine if you fly at 1/2 throttle or less. I find the flight times to be about the same between them, though the sport motor uses a slightly smaller 10" prop and give a bit more top end.

The eflight motor you have will work fine, and with a 2200ish sized lipo, I commonly get 30 minute flights with ny biplane configuration. With the single wing, I did have some 45+ minute flights doing nice and easy touch and goes.

I like to put my servo's all the way back against the tail so you have more room around the front of the plane to move the batteries around to adjust cg, rather then sliding the wing. This way you should be able to use all of your 3 cells quite easily.

The slow stick is a very adaptable and fun park flying, but you'll feel the need for a better plane before too long. But nothing is better then a 5 minute walk to the park with a handfull of batteries.

If you would like any pictures or advice, feel free to ask away.

[crrdr97]

Thanks everyone. I just thought the 2070 3 cell felt kinda heavy for the Slow stick. Guess i was just use to the 2 cell 1350 and a brushed motor. I flew a lot about 7-8 years ago and got out of it for a little while and decided to get this slow stick. I'm glad I got a slow stick and not a sport plain like I almost did. I was pretty rusty at flying. After I fly this one for a while I'll move on and save this one for the park down the street.

[hayofstacks]

It is a bit heavy honestly. I feel it fliest best in the 1300-1500 range. A 1000mah 3 cell is awesome for power, but has very little flying time. My dad used to fly his on a 800 3cell from a helicopter, and really liked that setup.

I personally adore the long flighttimes of a 1800-2200mah battery, but that it just personal choice. The slow stick was designed around reletively light compnents. If your okay with a 5-10 minute flight, a 1000mah works well, but a good standard seems to be a 1300mah.

[Beemerider]

One of the neat things about the SS is it will fly pretty well with a wide range of battery choices. I've flown mine with a 1200 3s up to a 1500 3s. It flies a long time on a 1800 2s. Just adjust your cg. I have a 1300 kv and a 10X4.7

[crrdr97]

Thanks for all the help! I flew it for the first time today with the brushless setup with the 2070mah 3 cell. All I can say is wow huge difference. I can actually fly it with a little breeze now and it's so much quieter! Now I need to reinforce the wings. I did a loop and I could see them flex a lot. Oh and I bought myself a early Christmas present today. A dx6i

[crrdr97]

What do I need to make my setup go vertical?

[hayofstacks]

It should go vertical as is. Mine did with a 400 class motor and about 140watts.

[hayofstacks]

Bigger props generally mean more thrust, as well as lower pitch. I like about a 10X3.8 sf. I'd be careful with prop sizes if you dan't have a wattmeter. These electrics will cook with too much current running through them.

[crrdr97]

It will go for a couple feet then runs out of umpf. If I got a 10x3.8 slow flyer it would go farther? But I should probably get a wattmeter first.

[Beemerider]

Mine with a Emax 2822, 10X4 and 1250 3s lipo will jump off the ground in less than 3' and go near vertical for 50' or so. Maybe more but I always back off the throttle. After all it's a Slow Stick!

btw--that big battery you're using adds a lot of weight. A smaller 3s will help your help your vertical performance. And yes a wattmeter will help you choose the right prop for your motor and keep your current draw within what your esc and battery needs.

[crrdr97]

I have a 1500 3s I havent tried yet and a 1800 3s on its way in the mail. I'll try the 1500 tomorrow. I did notice I have to keep the speed up carrying that heavy battery. The only plus to it is the 35 min run time.

[dgholmes59]

One of the best and easiest methods I have found using Webocalc. Step-by-step instruction with examples.

http://www.rcgroups.com/forums/showthread.php?t=1136470