RunRyder - Evo 50 Inverted flying

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HIROBO Freya - Sceadu - Shuttle > Evo 50 Inverted flying

BANDANA
Senior Heliman
Location: Rochelle, Illinois

Evo hovers "hands-off" upright and inverted just fine.
I'm just starting to do 8's inverted and I'm having trouble keeping the forward momentum.
It seems it wants to pitch up and stop if I stop holding some back stick. Is this a balance issue, paddles or just a pilot problem.

Bandana

09-02-2008 01:56 PM

HOMEPAGE

BarracudaHockey
rrMaster
Location: Orange Park FL

Sounds like a balance issue that was corrected with trim

AMA 77227
http://www.jaxrc.com

09-02-2008 01:57 PM

BANDANA
Senior Heliman
Location: Rochelle, Illinois

So I should step back and balance on the flybar, retrim and try again?

Thanks
Bandana

09-02-2008 02:41 PM

HOMEPAGE

GM1
Elite Veteran
Location: Tallahassee, Florida US

Hmmmm.................

Does it do the same upright?
Gordie

On a dog sled team, if you're not the lead dog, the view never changes.

09-02-2008 04:34 PM

BANDANA
Senior Heliman
Location: Rochelle, Illinois

Seems to track pretty true upright. I just picked it up by the flybar right now and it was sitting with the tailboom level without fuel.

Bandana

09-02-2008 05:37 PM

HOMEPAGE

Turkana
Senior Heliman
Location: Montreal,Quebec , Canada

Mine does the same and if I pic it up on the flybar it seems balanced perfectly. Just don t know.

09-02-2008 05:49 PM

GM1
Elite Veteran
Location: Tallahassee, Florida US

here's a tough question:
Is the swashplate level in both hover mode and in idle up? If it is, a little nose heavy will cause it to move forward both upright and inverted. If it's tail heavy, to hover at neutral requires forward trim which translates to a stop while inverted.
Gordie

On a dog sled team, if you're not the lead dog, the view never changes.

09-02-2008 06:05 PM

BANDANA
Senior Heliman
Location: Rochelle, Illinois

I may be a little slow on that answer.
How would it be different?

Setup is non-CCPM, 9CHP.

Ok, maybe just a little more than slow.

Bandana

09-02-2008 06:22 PM

HOMEPAGE

Leif
Elite Veteran
Location: Oxford, PA - USA

Two possibilities:

1. You mentioned that you balanced the heli dry. It's generally a good idea to balance with about a half tank of fuel. If the heli is tail-heavy and you have trimmed it for upright hovering, there would be a bit of forward-cyclic in the trim. This would mean you would need back-cyclic input when flying inverted.

2. The HPM version of the Evo can exhibit cyclic offsets at extreme negative pitch. I experienced this on all my Evos. I correct this by adding two mixes in the radio (Pitch->Ele, Pitch->Ail). I find that the mixes are only needed on the negative pitch.

#2 can be due to non-perfect linkage setup, but I've drilled the servo wheels with the 2 degree offset and I still see this symptom. The best way to check this is to perform a maximum power inverted climbout and see if the heli tends to drift. Without the mixes mine will punch out fine upright but drifts badly inverted. It'll hover inverted beautifully though. Mine tended to drift nose-down with a right roll before I mixed this out.

Incorrect phasing plays into this as well. Get the phasing right before you add the mixes or you'll be going crazy trying to chase a straight loop or axial roll.

Leif

09-02-2008 06:45 PM

pwood
Key Veteran
Location: Dubai - UAE

Hi

Try hover inverted.

With my Sceadu, the tail would drop and i would have to constantly hold a back stick correction.

Just like GM1 mentioned regarding the cg. I moved the cg forward and it now hovers perfectly both upright and inverted.

I moved the cg forward by removing weight in the tail. Carbon vertical fin, carbon boom supports and remove the horizontal fin did the trick.

Regards
Paul

09-03-2008 06:55 AM

naked painter
Senior Heliman
Location: Mid glamorgan uk

I love this site. You learn something every day.

I've been experiencing the very same issue and I put it down to my inexperience at inverted circuits?

Thanks everyone for your comments and thoughts.

09-03-2008 10:03 AM

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HIROBO Freya - Sceadu - Shuttle > Evo 50 Inverted flying

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