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I am new to Electric Helis and I want to build an ECO8 right the first time. So I believe I should buy the brushless Motor first. The X-250-4H is recommended on this site, but the Controller with BEC is vague about which one and what gears would be best.
A V45 or the V90? Then what gear set for the ECO8? I understand I will need to run 10 cells. My plan is to run the Jetranger body.
If anyone could make some comments and recommendations, I would be very thankful,
I use the X-250 4H motor and reccomend it.
Berore you go with the Ikarus ESC look at the posts here in the motor forum. There have been some past problems with the X-250 4H but most of the problems were when useing the Ikarus controller.
I use a Schultze Booster 40 in my ECO and I highly reccomend it. Schultze also has a newer line of ESC's that have a rotor RMP govoner built in, called the Future line if I remember correctly.
I agree with 10 cells. 13 to 15 tooth pinion, I'm useing 13. Higher will give more RPM for a more stable heli.
If you can afford to go brushless the you should do it to begin with you will have no motor problems from then on.
In regard to speed controllers. I have used both the V90 and a Schulze future 45Ho with ten cells and the Ikarus 250-4 I tried 13 teeth and 14 teeth pinions and opted for the 13 teeth.
I live in a hot climate (South Australia) where we have had 29 days over 35 degrees centigrade this summer and one day when it reached 43 degrees centigrade. Whilst the V90 never failed on me it did sometimes get very very hot.
When I replaced it with the Schulze speed controller my flight times got slightly longer and the head speed rose by 200 rpm. The future controller will give you more flexibility than the Ikarus controller. It is a sensorless type controller so you can use it with any motor (even ones with a sensor). The 45ho has no bec so you have to use an external voltage regulator. If you look at Kurt Moraws web page you will find out how. I use a 5A 5V external voltage regulator and never have any BEC problems. If you get the 45he it does have a 3amp bec built in.
i use the 250 4h in a stock heli with the v45 and in a complete tuned one with v90 controller.
one is running 10 , one 12 cells
10 works fine, 13 tooth is ok but i dont have any expirience with the ranger body - if ur new to helis i doubt u'll need the body for the next weeks - use it as a trainer first.
if ur planning to use v90 and 12 cells than the 'free rotation' device in the main gear isnt sufficient for the needed torque. it broke several times yet. only solution - carefully glue it in with CA. with 10 cells i never had that effect on the device.
the v90 stays colder than the v45. if money isn't a point go for the v90
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