Help on choosing Trex 700 AP motor

[barrocco]

Hey! I am doing AP and need a good efficient motor. I need about 1300 RPM (800mm blades) and need a motor that is low KV and very EFFECIENT.
I know about Xera, but I dont think I can get one because guys at Xera wont answer my mails. Can you please help med choosing another motor? 12S setup.

[outofphase]

Scorpian makes great motors. They have a 300Kv, I currently us a Hacker Turnado motor @ 400Kv spinning 710mm.

[barrocco]

I can explain a bit more about my cameraship. It is a trex 700 F3c with 800mm blades SYMMETRICAL from Rotortech.
It is with a E-4 mount from HelicamSolutions. Total weight ready to fly with cam is about 9kg.
112T main gear and 12T pinion. 12s lipo 5000mah.

I can order the three following motors:

HYPERION HS4035 0400 KV

Neu motor, 1915H/1.5Y, 450Kv

or the

X-Era 4035-400 (I found one I can order)

which one should I order. My first priority is FLIGHT TIME, but power is also important. Thanks for the help, guys!

[hero-cheng]

http://www.modellsport.ch/5-antrieb/...-3y-400kv.html

[Cirkus]

I'm using a 5035-410, its great. The picture in this link shows a 8 or 10mm shaft but it's actually 10mm through the bearings and then ground down to 6mm for the pinion. Awesome motor.

http://www.scorpionsystem.com/catalo...0/hk_5035_410/

[Goldenhour]

Check out the 300 Kv (only one) on the Photoshipone website. $140. It's a big motor, I use one on my 600. 10s, 1200 rpm with 620 spinblades. 11lbs auw over 14min. flight time with 5000 mAh batteries.

[13kawasaki13]

I'd go with the neu motor I have used neu motors in helis and rc trucks and they are by far the most efficient motor I have ever used

[daruq7]

Isn't NEU gonna be too fast for this setup? NEU is 450KV so at 80% efficiency that would give you 9 teeth pinion... a no no! A slower motor is needed. I went for a 330KV from Scorpion and I'm pleased with the performace/efficiency.

[helicek]

The main gear for 700 nitro and a 15 teeth pinion (164/15) will give a ratio of 10,93. The slant main gear and pinion combo (112/12) give a ratio of 9,33. Just by moving towards a smaller modulus gear you gain 17%

164 teeth main gear = CNC M0.7 Main drive gear(164T) HN7019-2
15 teeth pinion= Pinion Gear 15T H60174 6015 (for 6mm shaft)

Ahmet

[daruq7]

You don't want to be running 800mm blades with mod 0.7 main gear. It will become a weak point and could strip durring the flight. Only use mod 1.0 on a heli of this size.

[helicek]

Hi Darug,

I know it is not as robust as 1.0 modulus but I have been using modulus 0.7 164T x 16T on my t-rex 700 with 180cm rotor for 1.5 year now, have not had one slip during flight. I say it is safe to try.
Ahmet

[joliecoeur13]

what about a Xera motor , runs very smooth , something like this :
http://www.xeramotors.com/index.php?...emart&Itemid=1

from my experience the Neu and Xera have less vibration , just my opinion and testing