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01-23-2012 09:46 PM  6 years agoPost 1
vidizow

rrNovice

AZ

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Cannot find a reference in the manual for desired headspeed. 690mm blades. Will not be flying 3D. What headspeed should be used?

Thanks!

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01-24-2012 12:40 PM  6 years agoPost 2
FLYERCLD

rrVeteran

Proctor, Arkansas

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I run:
N 1700
1 1850
2 1950
Shoot Justin a PM to see what he like to run on his eAurora.

Old pilots never die they just fade away

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01-24-2012 02:25 PM  6 years agoPost 3
vidizow

rrNovice

AZ

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Thank you

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01-24-2012 04:17 PM  6 years agoPost 4
GraZer

rrApprentice

Cape Town, South Africa

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Desired head speed will be just that, what YOU desire.
If you are looking for a reference, most people run 1650~1800 for general hovering and flying around and 1950~2100 for 3D.

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01-24-2012 04:35 PM  6 years agoPost 5
Santiago P

rrProfessor

South West, Ohio

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For sports flying and smooth aerobatics, the 1800rpm range is more than sufficient. That goes for any 700 size heli.
Higher RPMs are use for demamding aerobatics and to keep the engine/muffler combo on its optimun power range, but you will be sucking fuel likes there is no tomorow.
Never mind, this is electric. The 1800rpm still applies, any faster and you are blowing power away.

If you like big smooth flying, look into a set of FAI or FBL blades

S

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01-26-2012 06:27 PM  6 years agoPost 6
Justin Stuart (RIP)

rrMaster

Plano, Texas

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If you go for something crazy like 2250rpm, you'll have incredible performance for about 3 minutes. If you go with something much slower like 1800, you'll have gentle flights that last for 6+ minutes.

If I were you, vidizow, I would shoot for something between 1900 and 2000rpm. You say you're not big into 3D, right? The faster your blades are going, the more they are just churning up the air and burning up electrons.

Really fast headspeeds are good for showing off. The blades are loud, and they make a tremendous "brrrrrrr" when you fly by. But you've really got to be on your reflexes because the helicopter reacts very fast, and to protect your batteries from puffing you'll have to land just about as soon as you start flying.

If you try for 1950rpm headspeed and carefully track your batteries (using the 80% rule), I think you'll get at least 5 1/2 minute flights and have a lot of fun.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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01-26-2012 10:58 PM  6 years agoPost 7
vidizow

rrNovice

AZ

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Justin,
Thanks for the reply. I'm using a Castle HV120 on 12S with a 470kv motor at 9.9:1 gear ratio. The Castle software tells me 2000 is above the governed speed. Are you using fixed end points on the throttle curve or differing pionon sizes to obtain 2000 rpm? (I also have the 11 and 12 tooth pinons)

Thanks again!

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01-26-2012 11:04 PM  6 years agoPost 8
Justin Stuart (RIP)

rrMaster

Plano, Texas

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In my machine, I use a Kontronik ESC with a 520kV motor. I set the throttle curve to a flat 70% which gives me 2100rpm head speed. I find this to be a good compromise between flight time and power.

I am not sure you're going to be able to achieve a 2000rpm headspeed with that 470kV motor. The lowest kV I have seen used so far in the e-Aurora is 500kV. But perhaps others will chime in with their experiences.

I think you should just try and fly it with the 470kV motor, a 12T pinion, and your Castle 120HV set to a reasonable throttle curve to see how it flies. I imagine you'll get around 1800rpm headspeed. This might work well for you given your preferred flying style. Give it a try and let us know how it worked for you.

I have flown my e-Aurora at as low as 1500rpm headspeed (by bringing my throttle curve very low), and while it is slow, it still flies fine. (I did this because I have considered setting up an ultra long flying time Aurora using a 330kV motor. This would give approximately 1300 to 1400rpm headspeed and would in theory allow for perhaps as long as 10 minute flights which is more than long enough to do an FAI routine).

So if you are not able to get to 2000rpm headspeed with your current setup, it's not the end of the world.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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01-26-2012 11:08 PM  6 years agoPost 9
vidizow

rrNovice

AZ

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Thanks. I just plugged the esc back in and the the 12 tooth pinon will get me 2000 rpm. The online heli headspeed calculator gives me different numbers? I'll try the 12 tooth for starters and adjust as needed. Again, thanks for the help.

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