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HomeAircraftHelicopterThunder TigerOther › Idle-Up Curves without Governors
11-21-2006 02:27 AM  11 years agoPost 1
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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I'm curious what Idle-Up 1 and 2 curves people are using for their Raptor 50's.

Are you using conservative curves like 100/75/50/75/100 for your Idle-Up throttle curves?

Or are you using something much more aggressive like 100/90/80/90/100???

I've heard of Trex pilots using very aggressive cures, but I did not know if that applied to Nitro pilots...

Rockohaulic

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11-21-2006 02:58 AM  11 years agoPost 2
AMainMaker

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Nappanee,IN

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Definately not for nitro. With my 50 it is more like 100 48 37 48 100
that gives me a head speed arond 2000 rpm.The 50s overspeed real easy which is why the numbers are so low. Thats is using 600 mains and a hyper 50.
Hope This Helps
Jason Harmon

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11-21-2006 04:29 AM  11 years agoPost 3
raptor_rick

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Knoxville, TN

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Almost the same curve for idle up 95 48 35 48 95...on 30%.

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11-21-2006 07:49 AM  11 years agoPost 4
soulrider911

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Novato Ca

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WOW
Holy smokes I have been running like 100 80 60 80 100, guess I need to re-consider that...But I also do not have a tach and never have...seeing this post I'm sure is going to save some my heli form near destruction.

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11-21-2006 11:00 AM  11 years agoPost 5
Motions

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Tallahassee, FL

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I'd say your lucky the head hasn't blown apart yet.

_______
Scott M
Team Mikado USA

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11-21-2006 12:51 PM  11 years agoPost 6
jsenicka

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Eagle River, WI

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On 30%, with an MP2, the Hyper will settle in nicely at 17000 as long as you don't agressively overspeed it on negitive. To get this you need a throttle curve like said above. I run a 9Z, but the appoximate 5 point curve is 100 55 37 55 100. I also run 40% swash mixing to keep the power up in demanding cyclic manuevers.

A rotor tach and a buddy to operate is pretty much essential equipment for setup

Jim Senicka
Team Manager, GrandRC Flight Team

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11-21-2006 02:47 PM  11 years agoPost 7
Droid

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Deep down in the Southwest- UK

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Soulrider

Dont worry i've run a 50 v1 on metal headblock at 100 80 60 80 100 for three years its aggressive but bits wont fly off!! 37% at zero pitch is for girls!!

Quotes may have been changed for my own amusement

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11-21-2006 05:42 PM  11 years agoPost 8
soulrider911

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Novato Ca

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Man, now I'm really confused, is running a 100 75 50 75 100 curve, or there abouts going to blow my heli apart...I been flying that curve for like a year, it seemed to work great...my buddy has a tiger 50 that he runs @ 100 80 65 80 100, and he has been flying for about 3 years with it that way>>>

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11-21-2006 05:52 PM  11 years agoPost 9
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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This is all very interesting!

I currently run mine 100/75/50/75/100 with a hyper 50 and I have tached it. This weekend it tached at 1960 - 1980 rpm.

How can you guys run decent headspeeds with curves as low as 100/55/37/55/100???

What is your Collective Pitch curve for that low Idle-Up curve???

I am more confused than when I posted!!!

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11-21-2006 06:24 PM  11 years agoPost 10
soulrider911

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Novato Ca

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I agree with Rocko, I have a hyper50 as well, even in the raptor manual it says to have a th. curve of like 100 75 50 75 100, I don't have a tach but I have a very strong feeling I would risk wrecking my heli do to unfavorable flight characteristics if I tried to take it up with a th. curve with a midpoint of 37!!

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11-21-2006 07:46 PM  11 years agoPost 11
Maxime

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Belgium

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percentages on transmitters aren't always exact from one tx to another. also throttle link geometry plays a big factor in this.

after top and low needle are well set, I put it in idle up 0° mid stick, put in my percentage that suits me as mid stick value, about 1950 idle up, and then lift off the heli to a hoover, and you shouldn't hear an rpm difference(put in value in 2 and 4 position), and the 2 remaining values are 100% off course

be carefull that your blades are exactly 0° in mid stick, or your inverted value (value 2) will be different then value 4

have a guy at the flying field with an optical tachometer

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11-22-2006 03:54 AM  11 years agoPost 12
jschenck

rrProfessor

La Vista, NE.

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Here is my setup - R50V2/Hyper/Mav-G4 600's/RD-8000
Pitch +10/6/0/-6/-10
Th. 100/54/41/48/100 - 20% cyclic/Throttle mix.

The throttle is setup exactly per Raptortechnique and Girard Ibanez

http://www.raptortechnique.com/throttlesetup.htm

team-raptor <dot> net/girard/throttle_linkage.htm

I started off with 100/65/50/65/100. I found it was way over-revving on mid-stick maneuvers such as tumbles and flips and inverted hovering was running away until I settled down to this setup. I am shooting about 2000 RPM.

btw- Michael Prewitt's setup for off centering the throttle servo (using sub-trim) to prevent over-driving the throttle servo with cyclic mixing was SLICK. I would have never come up with that on my own. It's simple and effective.

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11-22-2006 04:08 AM  11 years agoPost 13
soulrider911

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Novato Ca

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wait what was michael prewitts deal with the throttle setup, because if I try to program in a 20% throttle mix i get binding @ full throttle, I have a fut 7c I know the 9c prevents this...but what do i do to fix it...

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11-22-2006 04:17 AM  11 years agoPost 14
jschenck

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La Vista, NE.

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http://www.raptortechnique.com/throttlemix.htm

the basic idea is you pop off the throttle link, go to full throttle and add sub-trim all the way until the servo stops moving. Then reposition the servo horn to put it right at the full throttle position. My sub-trim (CNT on the RD8000) is at 60%.

very slick.

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11-22-2006 05:04 AM  11 years agoPost 15
soulrider911

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Novato Ca

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ooooo, yes yes makes tons of sense, im on it, I heard this somewhere before, but forgot how to actuall do it. sweet thanks

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11-22-2006 01:15 PM  11 years agoPost 16
jsenicka

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Eagle River, WI

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depending on TX, you may not need the setup to deal with over driving throttle. On Futaba, the 9C had this problem. The 9Z and 9C Super respect the throttle ATV even with swash mix.

Agree with the last few posts that keeping the 2 and 4 points way up to hold RPM during cyclic manuevers at forward speed or during collective use leads to way overspeed on tumbling/stationary manuevers. That is why you need a swash mix added in to compensate.

Jim Senicka
Team Manager, GrandRC Flight Team

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11-22-2006 06:57 PM  11 years agoPost 17
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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How do you add in a "Swash Mix"???

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11-22-2006 07:03 PM  11 years agoPost 18
z11355

rrMaster

New England

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2 program mixes that use elev,ail -> throttle.

some transmitters have these mixes pre-defined. on others, you simply
setup the mixes.

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11-22-2006 07:28 PM  11 years agoPost 19
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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So what does a Futaba 9C do for swash mix?

Do I set it, or is it already set?
the basic idea is you pop off the throttle link, go to full throttle and add sub-trim all the way until the servo stops moving. Then reposition the servo horn to put it right at the full throttle position. My sub-trim (CNT on the RD8000) is at 60%.
So what is the objective of doing this??

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11-22-2006 07:47 PM  11 years agoPost 20
Droid

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Deep down in the Southwest- UK

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Imagine you are at 80% throttle and you add more than 20% extra ( not that 20% throttle mix gives you 20% in real terms) you have a danger of over driving the servo causing damage to the servo/ carb/ or popping your link!!

By subtrimming the servo so that it no longer moves past a mechanical limit it cannot drive past 100%.

On my 100 80 60 80 100 curve i was running 45% throttle cyclic mix on a 9C std so it was important not to over drive my servo!!

Quotes may have been changed for my own amusement

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