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HelicopterMain Discussion › Slower headspeed with more pitch or faster headspeed with less pitch???
12-03-2011 04:48 PM  5 years agoPost 41
nwmtech

rrApprentice

Bellingham, WA

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Hey Dave, doesn't Kyle fly at like 2150rpm on his 6003D with 620's or am I remembering wrong?

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12-03-2011 04:53 PM  5 years agoPost 42
nwmtech

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Bellingham, WA

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I guess anything thing people haven't brought up much is weight. I tend to run non-ballistic head speeds but rarely go by the actual RPM because it depends so much on each individual model. A 10.3lb 700 might pop just fine for my liking at 1950rpm but a 11.5lb 700 I'd lean towards running 2050rpm + to get the same feeling out of.

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12-03-2011 05:36 PM  5 years agoPost 43
rudyy

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E. Amherst, NY

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Good topic.

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12-03-2011 05:42 PM  5 years agoPost 44
dahld

rrKey Veteran

Bakersfield, CA, USA

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@nwmtech,

2150 (down from 2200 with 603's), was the initial setting to help deal with the shorter flight times produced by the larger disc. But over time, Kyle's done what many do, and that's go back to the higher head speed, keep the larger disc, and just suffer the shorter flight time.

It's like drugs I guess. Once you try a little more, you never want to go back and use less. Drug pushers love the concept...and I think battery, motor, ESC, servo and kit producers love the concept too. A higher head speed is always harder on equipment (-:

My philosophy is to use the lowest head speed you "actually need" for your flying style and abilities. Some guys just "need" the added performance - HA!!!

There's drug addicts, and then there's "performance addicts"

You've got to learn to "just say no"

(-: Dave

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12-03-2011 05:52 PM  5 years agoPost 45
nwmtech

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Bellingham, WA

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I agree Dave. 4min is not acceptable to me. Until I can learn to do all the moves at lower headspeeds I don't think I "need" more. Thanks for your input.

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12-03-2011 10:32 PM  5 years agoPost 46
RJJ

rrNovice

KENT

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Having read this thread I tried the 700e at 1950 rather than the usual flat out. Felt a bit less locked in for a few minutes but after a while I was really enjoying it. Much quieter and a minute longer flight time. So then I though I could get away with a smaller pack. 4000 vs 5000 I normally fly. Now we are really talking. So much lighter in the air. Trouble is all the way home I was thinking what would it be like with the light pack at full speed.

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12-04-2011 07:49 AM  5 years agoPost 47
nwmtech

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Bellingham, WA

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Don't forget that to give a fair comparison you'll need to dial in the tail gain and head gain agian with the lower headspeed and/or lighter packs to really get the full potential. That's the first large drawback I've come across with the BeastX is that when I tune it for 1950rpm it flies like poo at 2100rpm. Damn VBar and their bank switching

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12-04-2011 10:00 AM  5 years agoPost 48
MrMel

rrProfessor

Gotland

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Another aspect to ponder.

How good the governor works.
Since I now run VBar governor I could drop the "hover headspeed" even further as when I do a punch-out the RPM does not drop as much.

So running 2200 RPM with a bad governor which drops to 1900 is "less fun" than running 2050 with a good governor which drops only to 2000

So, on my logo 600's I actually run 2050 on my 620mm bladed and 2120 on my 600mm and I feel that's enough.

Overall, I gain flighttime, and it's more fun to fly in the wind since it's not all over the place, but still during a full pitch it's equally fast as anyone else.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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12-04-2011 01:22 PM  5 years agoPost 49
fastflyer20

rrKey Veteran

N. Tonawanda, NY

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Great discussion, on my 600e PRO I never thought I needed 2500 HS with my nitro flying better than me at 2150. I set the 600e at 2150 in idle up 2 with 104's and have never even considered needing more HS for my "mild 3D" flying. It has allowed me to get away with light 3000 packs that I can swap with my 500.

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12-04-2011 02:08 PM  5 years agoPost 50
JOLT

rrVeteran

Baltimore, MD

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Just wanted to say thanks Mr Mel. Your posts break things down in a practical way that teaches even a bone head like me. Much appreciated

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12-04-2011 02:15 PM  5 years agoPost 51
unclejane

rrElite Veteran

santa fe, NM, USA

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oh yeah, good point on the governor. On my electric as it's setup right now (align 510kv motor), the governor in my CC 120HV is pretty loosey-goosey at the approx. 1500 headspeed I run (about 49% flat throttle curve in governer HIGH mode). Since I'm a "sport" flyer, it's not too big of a deal for me, but if I were a better pilot, it could be an issue. Going down to the 470kv align motor would probably be required for that.

On my nitro, tho, it doesn't make any difference. I get the same governor resolution no matter what the rpm (performance is just the powerband of the engine at that point)....

LS

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12-04-2011 07:45 PM  5 years agoPost 52
rexxigpilot

rrProfessor

Florida

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On my nitro, tho, it doesn't make any difference.
It does on my nitro! The predictive feed foward nature of a governor built integral with the FBL unit allows the gov to add throttle slightly before collective or cyclic input. Our brains can't detect the slight delay but the engine will certainly hold a more consistent headspeed. I found this to be true with both V-Bar and CGY750. This is a big reason why these are my favorite FBL systems.

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12-04-2011 08:51 PM  5 years agoPost 53
GMPheli

rrElite Veteran

W. Bridgewater, MA USA

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"The predictive feed foward nature of a governor built integral with the FBL unit allows the gov to add throttle slightly before collective or cyclic input. Our brains can't detect the slight delay but the engine will certainly hold a more consistent headspeed. I found this to be true with both V-Bar and CGY750. This is a big reason why these are my favorite FBL systems."

So we are buying radios with less and less latency, and now the FBL unit is adding latency just to hold a more consistent headspeed?

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12-04-2011 08:55 PM  5 years agoPost 54
MrMel

rrProfessor

Gotland

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No,

Since the FBL system knows what happens with the heli before the motor see the load, it can pre-compensate.

And it makes a BIG difference, not only in drop, but in power consumption in terms of peaks.
(keeping RPM in will always cost power, but the sudden peaks will be lower)

See attached picture.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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12-04-2011 09:06 PM  5 years agoPost 55
Justin Stuart (RIP)

rrMaster

Plano, Texas

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^^^ That's amazing.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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12-04-2011 10:26 PM  5 years agoPost 56
RJJ

rrNovice

KENT

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unclejane. I may be wrong but I think you are putting a big strain on your speed controller running such a low head speed. It would be much happier running with lower gearing at a higher percentage, may even improve flight time. I had a couple of fires ( literally ) before I realised this. the Castle HV controllers seem pretty tough though.

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HelicopterMain Discussion › Slower headspeed with more pitch or faster headspeed with less pitch???
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