Tag Archives: Seagull T-6A Texan II

T-6A Texan II – Motor Selection

To continue on with my T-6A Texan II Build Log, I am in the process of determining the appropriate electric brushless motor.  There is a lot of science around selecting the best electric motor for specific applications and, I must admit, I am still learning.

This aircraft is designed for a .75 to .91 cu in 2-stoke engine or.91 to 1.00 cu in 4-stroke engine.  I am estimating the flying weight to be 9.5 pounds.

A good starting point for sizing electric brushless motors is to use the following:

150 watts per pound Scale Flying
200 watts per pound Aerobatic/3D Flying

Since this is a military aircraft, I am basing my initial calculations on 150 watts per pound. With that said, 150w X 9.5 = 1425 total watts.

There are many electric brushless motor, battery and prop combinations that can be used.  So many that it can be confusing.  So any input is greatly appreciated.

UPDATE – I’ve made my decision.  I’m going with the E-flite Power 90, 8S 5000mAh batteries and 16×8 prop.  This will produce 1800 watts max. which is plenty of power for this aircraft.

Options I am looking at right now are:

MOTOR/PRICE RPM/Volt (Kv) WATTS CURRENT CELLS RECOMMENDED PROP
E-flite Power 90
$129.99
325Kv 1800 50amp
65amp max.
6S to 8S LiPo 16×8 to 18×8
E-flite Power 110
$139.99
295Kv 2000 55amp
65amp max.
8S to 9S LiPo 17×8 to 19×10
Hacker A50-16L-V3
$169.00
265Kv 1862 80amps
100amps max.
8S 16×8

I feel any of these motors would work well in this aircraft.  If you have any comments or recommendations, please leave them!

T-6A Texan II – Build Log

About two weeks ago, I started building a T-6A Texan II.  This is the Beechcraft version built by Raytheon Aircraft Company.

In the image above, the fuselage is about complete.  I am fitting the cockpit items; dahs and pilots.  None of this is glued in place yet; I still have some trimming of the front dash to do.

This should be a very cool airplane!

Specifications

Wing Span 63.0″
Wing Area 647.9 square inches
Flying Weight 8 to 9 pounds
Length 58.3″
Motor Working on power configuration.
E-flite Power 90 or Power 110?
Hacker A50-16L?
UPDATE – I’ve made my decision.  I’m going with the E-flite Power 90, 8S 5000mAh batteries and 16×8 prop.  This will produce 1800 watts max. which is plenty of power for this aircraft.
Retracts 60-120 Tricycle Electric Retracts by E-flite

Here you can read the other articles about this build process.

About the Beechcraft T-6A Texan II

The Beechcraft T-6 Texan II is a single-engined turboprop aircraft built by the Raytheon Aircraft Company (which became Hawker Beechcraft and is now Beechcraft Corporation).  Based on the Pilatus PC-9, the T-6A is used by the United States Air Force for basic pilot training and by the United States Navy for Primary and Intermediate Joint Naval Flight Officer (NFO) and Air Force Combat Systems Officer (CSO) training.  It has replaced the Air Force’s Cessna T-37B Tweet and is replacing the Navy’s T-34C Turbo Mentor.  The T-6A is also used as a basic trainer by the Royal Canadian Air Force (CT-156 Harvard II), the German Air Force, the Greek Air Force, the Israeli Air Force (Efroni), and the Iraqi Air Force.  The T-6C is used for training by the Royal Moroccan Air Force and the Mexican Air Force.  The Royal New Zealand Air Force will also begin operating the type in 2015.