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HomeAircraftHelicopterHIROBOOther › Left Cyclic Problem
02-09-2006 01:13 AM  12 years agoPost 1
EVO Newbie

rrNovice

Southampton, MA

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I've just brought my EVO 50 out of the hanger after a long (8 month) hiatus and while I solved a problem with the tail wanting to hunt... I now have a problem with the cyclic...

When I input Right Cyclic I get right movement with a touch of rearward movement. When I input left cyclic I get left and a whole bunch of forward movement... I checked the block on the Washout and that seems OK as far as alignment; I checked the radio for mixing and there is none at all programmed (9303 radio). All I can find is a bit of play in the Elevator arms (about 1/8". Anyone have a suggestion on how to get rid of the for/aft cyclic when all I want is right or left cyclic?

Thanks.

Jon Frost
Southampton, MA

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02-09-2006 01:20 AM  12 years agoPost 2
z11355

rrMaster

New England

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first off, determine if it's a radio issue or a mechanical issue.

do both servos move or only one? look at the swashplate & servo
arms.

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02-09-2006 02:08 AM  12 years agoPost 3
Leif

rrElite Veteran

USA

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Sounds like a phasing problem.

You said you checked the washout. How?

To properly check phasing, put your heli on the bench and orient the flybar to be perfectly parallel to your tailboom. On your radio, input fore/aft cyclic while holding the flybar. The paddles should NOT rotate. If they do, you need to loosen the radius block and rotate it until the paddles do not move when doing this test.

You can also try the same test with the blades oriented fore/aft using left/right cyclic. The desired result is the same. You should have NO paddle rotation when a "pure" right-angle cyclic input is given.

This is the mechanical phase adjustment. Due to gyroscopic effects, you might have a tiny bit of phase adjustment to do in the field to get the model perfect, but the mechanical adjustment should get you in the ballpark.

While you're at it, check the radius block for cracks. There's a new version out that includes a separate setscrew to hold it in place. You might have it perfectly adjusted but then have it slip when you spool up.

Leif

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02-09-2006 06:34 AM  12 years agoPost 4
CK_

rrApprentice

Redondo Beach, CA

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Set at 90 degrees like Leif said and tweak from there if required. Here's what I do. Do the largest diameter loop you can do using only aft cyclic. Check your position at the entrance and exit of the loop. They should be right on top of each other. If you exit offset to the left or right then adjust the phasing.

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