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HomeContestAircraftHelicopterAerobatic FAI F3C F3N Contest › FAI servos or.....
04-20-2011 09:13 AM  7 years agoPost 1
nytflyerrrApprentice - Temasek - My Posts: All  Forum  Topic

Hi folks, can't help it but are there reasons to why or is there really a need for a FAI specific servos or one could use any good torque/speed servos found in the ever growing market for heli electronics? For example, Bls252 vs Hitec 79** HV servo series. Im sure you know the specs for these two and the price differences. So, my point is is there a starkingly obvious advantage between their performances?

04-20-2011 02:38 PM  7 years agoPost 2
Four Stroker

rrElite Veteran


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Torque and Speed are just two of the parameters affecting the performance of a servo. Hitec got their foothold in the market by reducing servo buying decisions to these two characteristics.

FAI servos are more refined:

1. Deadband should be very small
2. Damping for large and small movements
3. Jumpiness or minimun step size

Servos set up for FAI are definitely different than those set up for 3D. If you are looking for a bargain FAI servo, try the BLS451's.

Hint: Servos work better with a good voltage regulator.

04-20-2011 02:40 PM  7 years agoPost 3


Nashville, TN

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I think it may be a question of actual field testing. Many of the contest pilots are (and have been) using equipment from several manufactures and probably have not used some of the Hitec servos in their contest models.

Since I have never used any Hitec servos, I can only discuss my perspective. I have had great results with BLS servos.

I will tell you that servos make a tremendous difference, especially in contest helicopters during hovering maneuvers.

Good luck with it.

04-20-2011 06:09 PM  7 years agoPost 4


Richmond, VA, USA

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I've been similarly thrilled with all my BLS servos, but if budget does not quite allow them on the cyclics, the 9255 remains today a simply superb servo for FAI use. I've seen them for as low as $109/each.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

04-20-2011 07:34 PM  7 years agoPost 5



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I have an opposite end of the spectrum for you. I have Hyperion ds20x-smd servos on my cyclics, and have both JR8900g and hyperion ds20x-gcd on the tail (different machines)

The Hyperion servos work extremely well and are priced at around 45.00 each. They are smooth, powerful, efficient and you cannot beat them for the price. They are also fully programmable.


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