Scorpion motors 5 head rotor

[Oceanchaser]

Question is there really a difference between the power to turn a 5 head rotor head on a 800 size Roban 500 MD scale helicopter. I'm speaking about the scorpion motor 4035- 460KV motor compared to the 4035-560 could some one please explain the difference will it really have any increase on a 5 blade rotor capability to have more torque lifting power . I would think not opinions needed please . Jim

[Pistol_Pete]

Your motor selection will depend on you gear ratio and your target head speed.

Given its a 5 blade, it will require less head speed than a 2 bladed for same amount of blade pitch.

For 800 size blades I would shoot for no higher than 1600 RPM range given its a scale.

(44.4 volts x 460 kv) / ( ? main gear tooth count / ? pinion tooth count ) = Head Speed

[Oceanchaser]

Thank you that makes a lot of since

[DCORSAIR]

Question is there really a difference between the power to turn a 5 head rotor head on a 800 size Roban 500 MD scale helicopter. I'm speaking about the scorpion motor 4035- 460KV motor compared to the 4035-560 could some one please explain the difference will it really have any increase on a 5 blade rotor capability to have more torque lifting power . I would think not opinions needed please . Jim

I would go with the 450KV myself, I've had 3 of the 800 size Roban MD500 and they fly great with a 450KV motor, I was at 75% on my throttle curve which is perfect in my opinion leaving 25% headroom, and no issues, 560KV more than likely will work but will have a higher head speed which you may have to govern down more which ESC's do not like, I sold my 500 so I don't remember exactly where I was at on the head speed but I do remember it was around the 1280-1350 rpm range, I don't think you need more than that on that Roban 5 blade head.

[Oceanchaser]

Yes I was wanting to
keep the heads speed down so the 450 kv will do the job . Thanks for good advice from your passed owning a hughes 500