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Old 03-30-2013, 09:58 PM   #1
Don Sims
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Question New member asks: Tyro 150 Power System Question - Input requested

RC Foater sent this to me... Can you help answer his question?

2013-03-30 Tyro 150 Power System Question - Input requested

I am building a Mountain Models Tyro 150. This will be my first powered trainer. It seems a good trainer: high wing, tricycle, flat bottom airfoil, low wing loading, can be flown slow, etc. I have only flown polyhedral gliders in the past: Gentle Lady, Bird of Time, Southern Kite, etc. so this will be my first R-E-A plane.

The Tyro designer recommended an Eflite Park 480 1020 Kv so I am using that.

My question concerns the other power system components.

After reading lots of articles in Wattflyer on power systems I plan on the following. (Specs Follow) Any and all comments welcome.

Plane: Tyro 150


Motor: Eflite Park 480 1020 Kv


Prop: Eflite 12 x 6 Slow Flyer Prop


Battery: 2200mAh 3S 11.1V 30C LiPo, 13AWG EC3


ESC: 40-Amp Pro Switch-Mode BEC Brushless ESC [EFLA1040]


Radio: Spektrum DX6i DSMX 6 Channel Full Range http://www.spektrumrc.com/products/d...prodid=spm6610

Specific questions:

Will the plane - motor - prop combo be easy on the battery life?

Is the ESC too large or should I go with a 35 or 30 A?

Would a larger battery be a good idea? A similar 2500 mAh would only take the weight from 6.1oz to 6.8oz. Many Tyro 150 forum posts mention that weight is not a problem. Is there any advantage to a smaller (1800mAh 3S 11.1V at 5.8 oz) battery?

Would a 10 X 5 prop overload the system?

A club member has a watt meter so we can check that on the ground.

Should I invest in a data logger? I looked at a an Eagle Tree V4 http://www.hobbyking.com/hobbyking/s..._100_Amps.html

Specifications: Tyro 150


Wingspan: 54 in

Length: 45.5 in

Wing Area: 558 sq in

Flying Weight: 37 to 45 oz

Wing Loding: 9.5 to 11.6 oz/sq ft

Controls: 4 (Rudder, Elevator, Ailerons (2 servos), Throttle)

Power: 150 to 250 Watt Brushless Outrunner

Battery: 3S LiPo (Capacity sized to chosen motor)

Specifications: Park 480 Brushless Outrunner Motor, 1020Kv

Type: Brushless outrunner

Size: Park flyer

Bearings or Bushings: One 4 x 9 x 4mm Bearing, and One 4 x 10 x 4mm Bearing

Wire Gauge: 16

Recommended Prop Range: 10x7 to 12x6

Voltage: 7.2 to 12

RPM/Volt (Kv): 1020

Resistance (Ri): .06 ohms

Idle Current (Io): 1.10A @ 8V

Continuous Current: 22A

Maximum Burst Current: 28A (15 sec)

Cells: 6-10 Ni-Cd/Ni-MH or 2-3S Li-Po

Speed Control: 25A to 40A brushless

Weight: 87 g (3.1 oz)

Overall Diameter: 35mm (1.40 in)

Shaft Diameter: 4mm (.16 in)

Overall Length: 33mm (1.30 in)

Specifications - 2200mAh 3S 11.1V 30C LiPo, 13AWG EC3

Type: LiPo

Capacity: 2200mAh

Voltage: 11.1V

Connector Type: EC3

Wire Gauge: 13 AWG

Weight: 6.10 oz (173g)

Configuration: 3S

Length: 4.10 in (104mm)

Width: 1.33 in (34mm)

Height: 0.95 in (24mm)

Maximum Continuous Discharge : 30C

Maximum Continuous Current : 66A

Specifications: 40-Amp Pro Switch-Mode BEC Brushless ESC

Brake: Yes - programmable

Continuous Maximum Current: 40A with reasonable cooling

Input Voltage: 10.8-22.2V

Input Connector Types: 13AWG with E-flite® EC3™ connector

Output Connector Types: 13AWG with 3.5mm female gold bullet connectors

Momentary Peak Current: 55A (15 sec)

Length: 2.70 in (68.6mm)

Width: 1.30 in (33.0mm)

Height: 0.50 in (12.7mm)

Weight: 2.2 oz (62 g)

Wire Gauge: 13AWG


ModulationSM2/DSMXBand:2.4GHzReceiver:AR6210 Full-Range receiver (included)Programming Features:Helicopter & AirplaneModel Memory:10Modes:Mode 2Transmitter (Tx) Battery Type:AA NiMH 1500mAh batteries (included)Charger:4-cell 150mAh wall charger (included)Experience Level:IntermediateIs Assembly Required:No

Take care and thanks for posting at WattFlyer!!

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