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Kevin41389 · 09-19-2014, 11:03 AM

Hey guys,

I posted something on here about battery voltage and head speed a few days ago... I'd like to refine my thought/question...

I am trying to figure out how to adjust my head speed by changing as little as possible on my current rig (for money sake)

I have a Chaos600e (trex knockoff) stretched to 700 running 710mm wide chord Spin Blades FBL. 12s 5000mah batteries, scorpion 4035-560kv motor, scorpion opto130amp HV ESC... I think I have a 12 tooth pinion on right now (easily changed)

So i believe my head speed with the current set up is going to be way to high and put a lot of load on the motror trying to spin those blades that fast...

should i...

A.) Buy a lower KV motor such as 450kv to try to lower my head speed that way (I can still play with pinions)

B.) Change to a 10s battery setup to lower my head speed that way (still can play with pinions)

C.) Run a 6s battery setup by running in parallell instead of series

D.) Just chang out my pinion to try to vary head speed (I think with a 6mm shaft i can only get down to like 10 or 11 teeth.)

Please feel free to let me know your opinion or thoughts. Ill take any help I can get. I have had the bird for a few years and put the project on the side... I now want to get it up in the air without ripping it appart or spending a bunch of money on it... I hope thats possible.

Thanks in advance for your help!

-Kevin

P.S. I am running a 170 tooth main gear i believe.

nightflyr · 09-20-2014, 03:04 PM

By the number and the info you supplied.....

170 / 12 = 14.166 GR

560Kv * 44.4V = 24864

24864 / 14.166 GR = ~ 1755 RPM * 85%eff = 1491 HS @100% throttle

Exactly what HS do you wish to run?

Kevin41389 · 09-20-2014, 05:58 PM

Good question, I have been learning about wide chord blades, and have been hearing a lot of people talking about being able to produce close to equivalent lift by spinning wide chord blades at a lower rpm as compared to similar sized blades with a more narrow or standard chord... I guess I'm looking for advice on a good starting rpm based on my setup and I'd like to toy with it from there.

The main reason I haven't had it in the air to test different speeds is because I am not sure if my current power setup is geared for my airfoil setup (rotor size/style if that makes sense) and on top of those two things, can it be an efficient machine for longer flights (relative to say an 8 minute flight) or will it just be hard on my batteries/esc/motor.

Again, thanks for the response! I've been excited to get this going, and I appreciate any help that speeds things up for me!

nightflyr · 09-21-2014, 03:56 AM

In your current configuration ( if correct ) you should be able to run from 1491 RPM down to ~ 1050 RPM safely.....
Might suggest you start there and see how your machine reacts.
As to flight times.. that depends on a few things ...
Helicopter weight
Payload
Blades

Another possible option would be to run on 6S, withe proper gearing (main and pinion)
it would be possible to drop your HS and lower your current draw during flight.

Kevin41389 · 09-21-2014, 08:36 AM

Thanks! I had thought about trying it as a 6s setup... Same 560kv motor, 170tooth main gear, and a 17tooth pinion at 85% efficiency. That puts me at 1057 on paper, just wasn't sure if that was to low of a head speed originally.

Kevin41389 · 09-23-2014, 08:55 AM

C'mon, you guys are going to either get me in trouble at work or at home because im spending so much time researching this topic. I have learned a ton so far, but im still missing one piece of info that i consider vital... a recomended head speed for basic photography/video with a helmet cam or dslr on a stretch 600 spinning 710mm wide chord spinblades. weight is around 16lbs RTF

I just want a good starting point so i can adjust my gearing to get me close and fine tune from there.

Thanks guys!

Mapoff · 09-24-2014, 09:12 PM

I tried the wide chord blades and they had too much lift. I never ran them down too low though. I found lower rpms caused more vibrations. 1420-1450 was best with 800 blades. 1500 for windier conditions.

Goldenhour · 09-27-2014, 06:25 PM

I have a set of 620mm I believe, spinblades. At 1400rpm they were quite and sounded like "real helicopter blades". I was using a 430kv Cobra motor as recommended by "DJ" at PS1 with them for the lower rotor speed.
They act more like wings on an airplane with lift. I use 620 rotortechs at about 1600rpm and get good results.

09-19-2014, 11:03 AM	#1 (permalink)
Kevin41389 Registered Users Join Date: Sep 2014	Your Thoughts: My Head Speed Options! Hey guys, I posted something on here about battery voltage and head speed a few days ago... I'd like to refine my thought/question... I am trying to figure out how to adjust my head speed by changing as little as possible on my current rig (for money sake) I have a Chaos600e (trex knockoff) stretched to 700 running 710mm wide chord Spin Blades FBL. 12s 5000mah batteries, scorpion 4035-560kv motor, scorpion opto130amp HV ESC... I think I have a 12 tooth pinion on right now (easily changed) So i believe my head speed with the current set up is going to be way to high and put a lot of load on the motror trying to spin those blades that fast... should i... A.) Buy a lower KV motor such as 450kv to try to lower my head speed that way (I can still play with pinions) B.) Change to a 10s battery setup to lower my head speed that way (still can play with pinions) C.) Run a 6s battery setup by running in parallell instead of series D.) Just chang out my pinion to try to vary head speed (I think with a 6mm shaft i can only get down to like 10 or 11 teeth.) Please feel free to let me know your opinion or thoughts. Ill take any help I can get. I have had the bird for a few years and put the project on the side... I now want to get it up in the air without ripping it appart or spending a bunch of money on it... I hope thats possible. Thanks in advance for your help! -Kevin P.S. I am running a 170 tooth main gear i believe.

09-20-2014, 03:04 PM	#2 (permalink)
nightflyr Registered Users My HF Map location Join Date: Jan 2009 Location: Long Island, NY	By the number and the info you supplied..... 170 / 12 = 14.166 GR 560Kv * 44.4V = 24864 24864 / 14.166 GR = ~ 1755 RPM * 85%eff = 1491 HS @100% throttle Exactly what HS do you wish to run? __________________ MSR x1 / mCPX x2 / 450 x4 / Chaos600 test bed / Chaos600 Air-Wolf / American WereWolf 800 / KFrame800/900/1000 / Assorted Fixed Wing JR9303 / JR9503 / Futaba10CHP

09-21-2014, 03:56 AM	#4 (permalink)
nightflyr Registered Users My HF Map location Join Date: Jan 2009 Location: Long Island, NY	In your current configuration ( if correct ) you should be able to run from 1491 RPM down to ~ 1050 RPM safely..... Might suggest you start there and see how your machine reacts. As to flight times.. that depends on a few things ... Helicopter weight Payload Blades Another possible option would be to run on 6S, withe proper gearing (main and pinion) it would be possible to drop your HS and lower your current draw during flight. __________________ MSR x1 / mCPX x2 / 450 x4 / Chaos600 test bed / Chaos600 Air-Wolf / American WereWolf 800 / KFrame800/900/1000 / Assorted Fixed Wing JR9303 / JR9503 / Futaba10CHP

09-27-2014, 06:25 PM	#8 (permalink)
Goldenhour Registered Users Join Date: Jun 2009	I have a set of 620mm I believe, spinblades. At 1400rpm they were quite and sounded like "real helicopter blades". I was using a 430kv Cobra motor as recommended by "DJ" at PS1 with them for the lower rotor speed. They act more like wings on an airplane with lift. I use 620 rotortechs at about 1600rpm and get good results. __________________ 600 Align Futaba 14SG And about $7000 in assorted things.

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09-20-2014, 05:58 PM	#3 (permalink)
Kevin41389 Registered Users Thread Starter Join Date: Sep 2014	Good question, I have been learning about wide chord blades, and have been hearing a lot of people talking about being able to produce close to equivalent lift by spinning wide chord blades at a lower rpm as compared to similar sized blades with a more narrow or standard chord... I guess I'm looking for advice on a good starting rpm based on my setup and I'd like to toy with it from there. The main reason I haven't had it in the air to test different speeds is because I am not sure if my current power setup is geared for my airfoil setup (rotor size/style if that makes sense) and on top of those two things, can it be an efficient machine for longer flights (relative to say an 8 minute flight) or will it just be hard on my batteries/esc/motor. Again, thanks for the response! I've been excited to get this going, and I appreciate any help that speeds things up for me!

09-21-2014, 08:36 AM	#5 (permalink)
Kevin41389 Registered Users Thread Starter Join Date: Sep 2014	Thanks! I had thought about trying it as a 6s setup... Same 560kv motor, 170tooth main gear, and a 17tooth pinion at 85% efficiency. That puts me at 1057 on paper, just wasn't sure if that was to low of a head speed originally.

09-23-2014, 08:55 AM	#6 (permalink)
Kevin41389 Registered Users Thread Starter Join Date: Sep 2014	C'mon, you guys are going to either get me in trouble at work or at home because im spending so much time researching this topic. I have learned a ton so far, but im still missing one piece of info that i consider vital... a recomended head speed for basic photography/video with a helmet cam or dslr on a stretch 600 spinning 710mm wide chord spinblades. weight is around 16lbs RTF I just want a good starting point so i can adjust my gearing to get me close and fine tune from there. Thanks guys!

09-24-2014, 09:12 PM	#7 (permalink)
Mapoff Registered Users Join Date: Feb 2013	I tried the wide chord blades and they had too much lift. I never ran them down too low though. I found lower rpms caused more vibrations. 1420-1450 was best with 800 blades. 1500 for windier conditions.

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