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Old 10-15-2012, 02:05 PM   #1
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Default Easy performance boost for my P51D ?

I'm looking for some advice on the easiest way to boost the performance on my Art-Tech P51-D. The added weight of the "crashproofing technology" and the Bluelight BL-3GRC gyro has taken away the scale performance. It flies very well just not the scale performance it should have.

Here are the specs.

Wingspan: 960mm / 37.8in

Length: 780mm / 30.7in

Weight: 550g / 19.4oz

Supplied Battery: 11.1V 1300mAh Li-PO

ESC: 20A Brushless ESC

Motor: Brushless Outrunner C4038-15

Prop: 10 x 6 / 4 blades

Channels: 4 (aileron, elevator, throttle and rudder)

Gear: fixed / removable

Fly time: 8+ min on a 1300mAh 3c 20s LiPo battery

Now it weights about 25ozs 687gr 1.56lbs
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Old 10-26-2012, 05:02 PM   #2
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Verify that your lipo packs are in good shape and able to sustain voltage at full throttle. 1300 mah packs don't have a lot of reserve capacity.
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Old 10-26-2012, 06:51 PM   #3
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Ditch the inefficient four blade prop and put on something like an APC 12x6 or 12x7.. That should give you a big performance boost without drawing significantly more amps (maybe less amps in fact)
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Old 10-26-2012, 10:28 PM   #4
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Counter-intuitive as it may seem, a larger battery, though heavier, can sometimes help.

1300mAh (1.3A) 20C lipo
1.3 Amps x 20C = 26 amps continuous discharge

2200mAh 20C lipo
2.2 Amps x 20 C = 44 Amps continuous discharge

Move up to a 30C discharge battery, and you get
2.2 Amps x 30 C = 66 Amps continuous discharge

So, if you put a 30C 2200mAh battery in there, you're adding 30-40 grams but getting 2.5 times the amperage (and 2.5 times the wattage).

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Old 10-27-2012, 12:35 AM   #5
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Originally Posted by mclarkson View Post
So, if you put a 30C 2200mAh battery in there, you're adding 30-40 grams but getting 2.5 times the amperage (and 2.5 times the wattage).
Err.. it doesn't work like that. The system wont pull 2.5 x the amps just because you put in a larger mAh battery. In fact providing the original battery was working within it's C rate and was in good condition then going to a larger capacity battery will make hardly any difference at all to the power. The power a system pulls is due almost entirely to the motor characteristics, prop size and battery voltage. mAh capacity in itself makes no difference to power.

In simple terms mAh capacity is analogous to the size of the gas tank in your car. Fitting a bigger tank doesn't make your engine produce more power (and yeah I know that's a slightly simplified analogy but it's largely accurate)
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Old 10-27-2012, 04:45 AM   #6
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Originally Posted by JetPlaneFlyer View Post

In simple terms mAh capacity is analogous to the size of the gas tank in your car. Fitting a bigger tank doesn't make your engine produce more power (and yeah I know that's a slightly simplified analogy but it's largely accurate)

exactly correct ! sometimes difficult to make some realize "mah" means capacity.....not "performance"
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Old 10-27-2012, 05:40 AM   #7
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Originally Posted by DCDetector View Post
I'm looking for some advice on the easiest way to boost the performance on my Art-Tech P51-D. The added weight of the "crashproofing technology" and the Bluelight BL-3GRC gyro has taken away the scale performance. It flies very well just not the scale performance it should have.

Here are the specs.

Wingspan: 960mm / 37.8in

Length: 780mm / 30.7in

Weight: 550g / 19.4oz

Supplied Battery: 11.1V 1300mAh Li-PO

ESC: 20A Brushless ESC

Motor: Brushless Outrunner C4038-15

Prop: 10 x 6 / 4 blades

Channels: 4 (aileron, elevator, throttle and rudder)

Gear: fixed / removable

Fly time: 8+ min on a 1300mAh 3c 20s LiPo battery

Now it weights about 25ozs 687gr 1.56lbs
If you don't have one, might be a good idea to pick up one of those wattmeters to make danged certain going to a larger prop will not burn something up.

One issue to worry about is if you go to a more powerful motor, you might have problems getting the spinner to align properly with the fuse. And maybe the extra power might overstress the model. Going to a battery with more cells would very definitely risk burning up something. Several youtube video clips also suggest going to a more efficient two blade prop.

DennyV
Retired and the days are just too short, busier than ever!
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Old 10-27-2012, 08:08 AM   #8
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Talking More power

your at the limit of the performance of your bell motor, thats just a 700kv bell motor trying to turn a big assss prop and a 1300 mah lipo does not supply a good reserve, it will lag real quick, and you have a good size plane too.

to make your plane come alive, you will need more thrust from a more powerfull motor and lipo combo,


if you're after maximum thrust and a long flight time, the GWS EP9050 prop and Power Up 11.1v 1650 20C Lipo battery will give you excellent results.

Propeller test data when using a 3-cell Lipo battery:
GWS EP9050:30 ounces of thrust at 15 amps.


Tell Jeff that Chellie sent you

http://www.headsuprc.com/servlet/the...0-Sport/Detail


http://www.wattflyer.com/forums/showthread.php?t=39483













Power Up 400 Sport Outrunner Brushless Motor

SKU: E-545
Price: $14.95
This item is in stock
Quantity:





















The Power Up 400 Sport is a 1.8 ounce, 1050KV, 170 watt, 400 class outrunner brushless motor that works well on many small to medium size parkflyers. It will produce up to 30 ounces of thrust when using a 3 cell Lipo battery and the GWS 9050 prop. This motor includes an X mount and prop adapter!

The Power Up400 is a good choice for models such as the GWS P-38, P-40, Me-109, 190, T-6, Spitfire, Corsair, Mustang, Zero, Formosa and Estarter. You might also consider this motor for planes like the popular Super Cub, Mini Super Sportster, Seawind, Sig Rascal, and many, many others. You can choose to have moderate performance and very light weight using a GWS EP8040prop and the Power Up 11.1v 1000 20C Lipo battery. If you're looking for high speed, try the GWS HD8060 prop and the Power Up 11.1v 1300 20C Lipo battery. And if you're after maximum thrust and a long flight time, the GWS EP9050 prop and Power Up 11.1v 1650 20C Lipo battery will give you excellent results.
I recommend using the Power Up 20 Amp ESC with the Power Up400 motor. All Power Up Electronic Speed Controls come with 3.5mm female connectors installed, and male connectors are included for your motor.
MOUNTING OPTIONS: The Power Up400 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, or the Aluminum Outrunner Mount for 10mm Sticks, making it a drop-in fit for many planes with 10mm sticks.
A 3.17mm Prop Adapter is included for mounting props.

Propeller test data when using a 3-cell Lipo battery:
GWS EP9050:30 ounces of thrust at 15 amps.
GWS EP8040:24 ounces of thrust at 10 amps.
GWS 8040 3-blade:25 ounces of thrust at 12 amps.
TP 8 x 4E: 25 oz thrust at 12 amps.
GWS HD8060:23 ounces of thrust at 14 amps.
GWS EP7035:13 ounces of thrust at 5 amps.
TP 7 x 6E: 18 oz thrust at 10 amps.
Propeller test data when using a 2-cell Lipo battery:
GWS EP1060:21 ounces of thrust at 11 amps.
GWS EP9050:17 ounces of thrust at 8 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 400 Sport Specifications:
Weight = 1.8 ounces (52 grams)
Diameter = 1.1 inch (28 mm)
Motor length = 1.1 inch (28 mm)
Shaft = 1/8 inch x 0.4 inch (3.17mm x 10 mm)
Voltage = 7.2 - 13.0
Current = maximum of 15 amps for 30 seconds
KV = 1050
Mounting holes are spaced 16mm and 19mm on center and are tapped for 3mm screws.
Please visit theHeads Up RC Brushless Motor Guidefor help in deciding whether this is the best motor for your plane.






E-mail a friend about this item.

I may be getting Older, But I Refuse to grow Up I am Having to much Fun to Grow Up LOL
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Old 10-27-2012, 08:17 AM   #9
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Now it weights about 25ozs 687gr 1.56lbs

Propeller test data when using a 3-cell Lipo battery:GWS EP9050:30 ounces of thrust at 15 amps.






the above power system will give you a little better than a 1 to 1 power ratio, meaning that it will go straight up and out of sight if you let it

I may be getting Older, But I Refuse to grow Up I am Having to much Fun to Grow Up LOL
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