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HelicopterMain Discussion › EVO 50 Pitch Setup
05-08-2005 04:39 AM  12 years agoPost 1
B.T.D.T.

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NY

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I finally finish building my EVO 50. It's been a while since I setup a Heli, so I need a little help/confirmation.

All radio controls center & swash plate level.

Wood blades balances with tracking tape about 3 " from tip & tape at CG line of blade. Old beam scale & then seesaw ( blades together on a high point.

Facing the leveled heli (Nose-In), paddles locked and level (Left to Right), blades from front to back. Install a old GMP pitch gauge with a blub level attached (Can't use GMP setup rods It binds on top end.) about 6" from tip. Gauge level & I marked the Zero position on a rule to the floor. Move full range of thottle/pitch. I got reading of both blades as Low,Mid,High stick is -12,-1,+11. Zero out gauge and Move the left/right stick & got a +7,-7 range.

I was courious to set what happen if I rotate the head/blades 90 degrees. Locked fly bar level. I was suprise to see the readings are off. (-11,-1,+10) on the left side and (-13.5,-2,+10) on the right side.

Is this normal? I never tried to measure it this way before. And I'm sorry I did. Now need to know why before I start it up to track the blades. I believe the pitch should be same all around since it'll be rotating.

Any input would be a great help.

I plan on having someone check out my heli before I fly it, As I said, it's been a while since I've built one of these. Just want to minimize his time looking over the heli.

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05-08-2005 04:48 AM  12 years agoPost 2
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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It means the swashplate isn't level. Set the gauge to read 0* pitch. Move the transmitter left stick up until you read 0* pitch. Now rotate the blade around the heli, reading gauge at 90*, 180, 270, 360, etc. When the swash is level, the gauge reads 0* all the way around.

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05-08-2005 04:59 AM  12 years agoPost 3
B.T.D.T.

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NY

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Thanks Al,
I've been up the past few nights till 3 to 4 AM trying to get this Heli finished. I guess I didn't think of that. I got to go back to check that. When I did the link setup. I inserted a home made wedge to the level the swash plate to the frame. I thought it was level.
Thanks again

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05-08-2005 05:14 AM  12 years agoPost 4
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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The gauge doesn't lie.

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05-08-2005 05:51 AM  12 years agoPost 5
TMoore

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Cookeville, TN

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No sense in burning the midnight oil over a 30 minute job. Set the TX at half stick on the T/C stick, set the pitch as close to 0 as you can get it, set the top end in throttle hold to +11, normal to +9, set the bottom of the stick to -8/9 and go fly. Make sure the throttle is set to 50% barrel opening when the T/C stick is set to half and insure that the pushrod to lever angle is 90 degrees when the throttle is at half stick. Make sure the washout and the bell hiller levers are level at half stick.

Go fly, trim everything else at the field.

Works for me.

You don't even really need a pitch gauge.

TM

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05-08-2005 02:32 PM  12 years agoPost 6
Leif

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USA

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The pitch guage may not lie, but I've found that if you move the collective after making a reading, you 'll be hard pressed to get exactly that same reading again a second time.

Mind you, I don't get a 2 degree difference between one reading and the next, but it's never exactly the same. My Robart guage doesn't hang perfectly, so the needle sometimes sticks.

I agree with Tim. A simple high/low/middle adjustment on the bench, and sort out most of the rest at the field. If the blades are significantly different, you'll correct this when you track them. If the swash isn't level, you'll need trim to hover. Afterwards, you can re-measure and adjust the mechanical linkages if you want the heli to be mechanically neutral.

Leif

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05-08-2005 04:49 PM  12 years agoPost 7
B.T.D.T.

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NY

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Thanks All.

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