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HIROBO Turbulence - SDX - Freya - Sceadu > Hirobo Sceadu Evo 50 HWM Pitch Up Tendency in Auto
 
 
CitationX
Senior Heliman
Location: Danville, IN

My Posts This: Topic  Forum		I am running an Evo 50, Hyper, 9303, 611, DS8311, Bobby Watts Hatori, mostly but not 100% metal head, stock Evo 50 paddles, CY600 blades.

It seems that everytime I flip into throttle hold to shoot an auto it has a real tendency to want to pitch up. I am running +10/-10 in all 4 modes (N,I1,I2,H). I checked my radio set up to make sure I didn't program something wrong in the pitch curve and all seems correct. I almost have to force the nose over just to get it to come down. Is this just a function of the rotor head because it seems "pitchy" in FFF too. Otherwise the heli is fantastic!

I realize I am probably going to have to add more information but maybe this is enough to get the discussion started.

Any suggestions or thoughts you guys might have would be greatly appreciated.

Thanks,

Nick
11-15-2009 01:23 AM
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Aaron29
Elite Veteran
Location: Bossier City, LA

My Posts This: Topic  Forum		Check your radio. Trims might be off from one mode to the next.

Some radios hold the trim setting when you switch modes, some don't. Check it on the bench. Put it in and out of throttle hold and see what you get.

Also if it is pitching in FFF, check paddle alignment and maybe put the weights back in to see if it gets better.

-Aaron
11-15-2009 02:28 AM
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AAKEE
Senior Heliman
Location: Boden, Sweden

My Posts This: Topic  Forum		The evo50 does pitch up in autos.

Hi !

The Evo50 has this tendency to pitch up in autos, the pitch up tendency is very massive when changing pitch. It even does the same when in an inverted auto, the nose still pitches up (up seen from ground).

I do mostly autos with my .50-helis so Ive ben working around this issue. My evo50 has been very precise tuned, with absolutely no pitch up in FFF. (Ive set the swash plate level square to the main shaft with a indicator clock, and adjusted the paddels and C/G down to perfection). Despite this, it does pitch up in autos.

You have to learn to live with it, and to do corrections with the cyclic stick. For me, when I got used to it, I didnt notice it any more..but every time I get a longer break in the flying, it's very noticeble when I fly again.

I got a SDX also, and it has a slight tendency for the same thing, but lot lot less. I would guess it's somethinh with the rotor head, and that the SDX newer, better rotor head deal with this issue better.
11-15-2009 11:07 AM
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Aaron29
Elite Veteran
Location: Bossier City, LA

My Posts This: Topic  Forum		I did a few autos with my old Evo and never noticed it. Maybe I just corrected without thinking.

I crashed it and it is no more. I guess I'll never know.

-Aaron
11-15-2009 11:10 AM
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BarracudaHockey
rrMaster
Location: Jacksonville FL

My Posts This: Topic  Forum		Mine never did it.

I agree with Aaron, see if you have your trim different in different flight modes.

Flip the flight mode and throttle hold switch on the ground and see if the swashplate moves.


AMA 77227
http://www.jaxrc.com
11-15-2009 12:58 PM
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AAKEE
Senior Heliman
Location: Boden, Sweden

My Posts This: Topic  Forum		I could add that Ive tested three different evo50, and all had the same pitching up in autos.
Ive also noticed it both with the Hirobo stóck FRP600 blades and with the Radix 600.
11-15-2009 01:48 PM
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rudyy
Key Veteran
Location: E. Amherst, NY, USA

My Posts This: Topic  Forum		Check your swash plate on the work bench. Does it move up when you flip the throttle hold switch?
11-15-2009 03:01 PM
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CitationX
Senior Heliman
Location: Danville, IN

My Posts This: Topic  Forum		Swash Check

I checked the swash plate movement switching between N,I1,I2 and throttle hold and there is no flip up. I did notice the swash plate being just a fraction high in the front with collective at mid-stick. I added a few clicks of trim (at all 4 throttle settings) and if that helps I will mechanically adjust it in the linkages.

One thing I did notice was a bit more "slop" in the head when I grab both blade grips and move them up and down alternately. This may indicate worn dampeners. Not sure if they are the hard or soft kind but this probably warrants looking into.

I will fly it today and let you guys know how it goes.

Thanks for the input.
11-15-2009 04:00 PM
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Alpine
Veteran
Location: Lexington, Ky

My Posts This: Topic  Forum		Citation, I have a new set of Infinavation 3d dampeners I bought for the EVo 50 but never got to use . I can send them your way . Pm me .

Roberto.

Roberto Munoz
IRCHA #344
11-16-2009 02:05 AM
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abgraham
Senior Heliman
Location: Deep South Texas

My Posts This: Topic  Forum		Do you have the horizontal fin attached?

When I had the fin attached, it would auto straight and flat. Without the fin it would have the tendency to pitch it's nose up. No big deal though just fly it down.
11-16-2009 05:03 AM
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AAKEE
Senior Heliman
Location: Boden, Sweden

My Posts This: Topic  Forum		I have the Infinivation dampfers on my evo50. It didnt change the auto' pitch up tendency at all.
But it is a very good upgrade, indeed. Me like
11-16-2009 06:31 PM
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BarracudaHockey
rrMaster
Location: Jacksonville FL

My Posts This: Topic  Forum		Where's it balanced at?


AMA 77227
http://www.jaxrc.com
11-16-2009 09:58 PM
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AAKEE
Senior Heliman
Location: Boden, Sweden

My Posts This: Topic  Forum		With swash completely square, paddels perfectly aligned and the C/G 100% perfect when 1/2 or 3/4 fuel it will still do the nose up thing. It's a behaviour you need to learn to live with if you fly the evo50.

I'd qiute sure a flybarless system wount show this cause the electronics mask it(or take it away).
I know the SDX is much more 'straight' and does it, but to a very lesser degree.

Just get used to it. I did some 2-3000 autos with my evo50 and after a while you dont notice.
11-16-2009 10:29 PM
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CitationX
Senior Heliman
Location: Danville, IN

My Posts This: Topic  Forum		My Evo Responses

BALANCE - It balances just ever so slightly tail heavy with 1/2 tank of fuel. I simply did a flybar balance check meaning I suspended the helicopter by picking it up by the flybar just outside the cage (with flybar perpendicular to the tail boom).

HORIZONTAL FIN - I have an aftermarket c/f horizontal fin on it that has pretty good surface area so it should tend to hold the tail down. Now, it isn't a "solid" fin if that is what you are after.

DAMPENERS - Roberto, I would really like to try the Infinavation 3d dampeners you make reference to. Check your pm I sent you.

LIVING WITH IT - Quite honestly, I am not opposed to this philosophy at all. I have 5 helicopters and all 5 are different in more than a few ways. With that type of inventory I sort of expect to have various subtle and not so subtle characteristics to deal with.

Thanks guys.
11-17-2009 12:32 AM
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BarracudaHockey
rrMaster
Location: Jacksonville FL

My Posts This: Topic  Forum		Tail heavy might be your problem


AMA 77227
http://www.jaxrc.com
11-17-2009 03:37 PM
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Alpine
Veteran
Location: Lexington, Ky

My Posts This: Topic  Forum		Nick, the dampners are in their way . When I flew the EVO I had a 5200 Fromeco up front . Try making the front a little heavier like Barracuda suggests .

Roberto.

Roberto Munoz
IRCHA #344
11-17-2009 03:58 PM
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CitationX
Senior Heliman
Location: Danville, IN

My Posts This: Topic  Forum		Tail Heavy - Nose Weight

I am running a 1900mah LiPo/Align 2-in-1 regulator setup for my battery system. The Fromeco 5200 would likely be more weight than both the regulator and battery pack combined...I think. Anyway, I should be able to either shift some gear around up front or add just a bit of nose weight. Don't panic! I am not into 3D so weight (within reason of course) is not a big issue to me.

Let's see what happens. Now I just need some decent weather to fly in!

Thanks again,

Nick
11-17-2009 11:28 PM
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racingstripe
Veteran
Location: Sacramento, CA

My Posts This: Topic  Forum		Try removing the horizontal fin.

Or,

If you've 'upgraded' the Evo tail unit with the Freya or D3 tail unit, downgrade back to the stock tail and put on some 95mm carbon tail blades.

andy

Proofread carefully to see if you any words out.
11-18-2009 12:42 AM
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AAKEE
Senior Heliman
Location: Boden, Sweden

My Posts This: Topic  Forum		No news? Still pitching up, I guess ?
12-05-2009 11:21 AM
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CitationX
Senior Heliman
Location: Danville, IN

My Posts This: Topic  Forum		No update yet guys. I ended up adding weight in the "battery box" under the front servos. Not sure if that is the correct nomenclature but to me it is a plastic box that is mounted just behind the front tongue extension and under the front few servos.

The front extension already contains my receiver, 611 amp, and GV1 amp so space was limited. The Evo now balances just slightly nose heavy with no fuel and dead flat with full fuel. Haven't had a chance to fly it since performing the modifications simply because the weather has turned sharply colder. This weekend looks a little more promising so the first chance I get I will give it a shot.

Check back again.
12-05-2009 01:27 PM
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HIROBO Turbulence - SDX - Freya - Sceadu > Hirobo Sceadu Evo 50 HWM Pitch Up Tendency in Auto
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