Lowering Headspeed

[ArthurKnowles]

I have a Lepton Ex with a Jazz 80-6-18, Hacker A30-10XL, eMultiGov, and 4S 3700 Hyperion batteries. I'm currently using a 24 tooth pinion, but purchased a 20 & 22 tooth pinion from ReadyHeli. After getting it all back together and test flying it, I've decided I would like a lower headspeed for normal mode. Currently I have it set for 2000 (normal), 2400 (idle 1), and 2800 (idle 2) using the eMultigov (I don't like the Jazz, CC, or other ESC govoners and trying to convince me otherwise at this point isn't going to happen so please don't try).

I'm thinking that I would prefer 1800 (normal), 2200 (idle 1), and 2400 (idle 2) at least for now. I can hover and make slow circuits, but I have only made two fast forward flights in my life (one with an eco 8 and one with a Shuttle Challenge) and succeeded in getting both flights back on the ground wihtout damage, so I don't need the high headspeed for 3D flight. What I want is to lower the headspeed and make it more stable (i.e. less responsive) until I am ready for more. I might want to go to 1600 (N), 1800 (1), and 2000 (2). That's seems pretty drastic right now, but may be where I want to go until I am ready for more. Hard to tell without trying the 1800 HS first.

In any case, I'd like to help the motor achieve better efficiency and not bog it down using the eMultiGov with the 24 tooth pinion. So, do you think a 20 or 22 tooth pinion would be the better choice?

[ArthurKnowles]

Yep, 1800/2000/2200 is just where I want it for now. I reset my eMultigov to these settings and liked the way it hovered. Nice and easy. At 2000 is was just a bit more responsive, but not as easy to hover. But at 2000 it a bit less bouncy in the wind. Same effect at 2200, just more pronounced.

I can see where higher headspeeds would be useful, but I'm not quite ready for them yet. So, which pinion do you think would do better. 20 or 22?

[rotodingo]

I have a kora 15-12 but according to hacker KV i think the 20T will be the good one.

Nicolas

[ArthurKnowles]

Thanks, I was thinking the same thing after a couple of headspeed estimates, but I wasn't sure I was doing it right. I used:

4 (serial pack) * 3.6 (voltage per cell under load) * 900 (rpm/volt of motor) / [ 94 (main gear teeth) / 20 (pinion) ]

Which gives you:

12960 / 4.7 = 2757 (headspeed)

That's assuming 100% efficiency so I expect it's more likely around 2600. But in any case it is close enough to a 2400 rpm headspeed and a better all around choice for what I want to do.

[rotodingo]

Should be Ok. Try it and let us know the result.

[xircom]

once you have the Jazz, its governor is really nice ... do you feel still a difference to the eMultiGov still ?

[Finless]

Dang.... those are some LOW head speeds... This is not a 50 sized nitro guys! I run 2900 and the heli really comes alive with these head speeds. 1900 must be a DOG in my opinion...

Bob

[Rocket Man]

I agree with Bob, up to a point. I found that my Lepton was TOO much alive at 2900, so I backed it down to 2800 and it sounds (and flies) better for me. I'm sure a lot of this is personal preference and flying style.

I am not a BTTW 3D guy, but prefer smoother, more graceful aerobatics. I'm running a Hacker A30-8XL/18 tooth/4s and the Lepton is very smooth and quiet. It flies more like a much larger 600 size heli, than a smaller T-Rex 450, IMHO.

With 420mm blades, I'm not sure my Lepton would stagger off the ground at 1900. :roll:

Ron

[3secondsToImpact]

I run 2700 normal, and 3200 idle up!

[ArthurKnowles]

Sorry guys, but 1800/2000/2200 is working really well fo rme at the moment. I'm still learning basic FF and these headspeeds work well for me. I bump up the headspeed as the wind increases as it aids in stability, but otherwise find the lower headspeed to be preferable.

I think all of you have just forgotten what a beginner needs in a helicoptor and/or how to set one up for someone starting out with basic needs.

PS: The eMultiGov is great! Beats the heck out of any Jazz/CC/or other ESC govenor I have tried.

[Rocket Man]

Arthur,

I doubt if I will ever forget what it feels like to be a beginner. I've started and stopped this hobby at least three times since 1974 and have come back each time to start all over. All of us are beginners at some facet of this hobby.

Your point is well taken and as long as your set up works for you, then I hope you enjoy your Lepton and keep learning. It's a nice little machine that flies like a much bigger heli.

Take care,

Ron