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CustomPC · 07-13-2006, 07:02 AM

Hi,

I'm finalising the setup of my Spectra-G and i cant get a symetrical positive and negative pitch range.

No matter what i try i always get 1-2 degrees more positive pitch than i do negative. That's for both collective and cyclic.

I've started with the servo arms at 90 deg and all bell cranks are level.

My swash is perfectly straight with zero interaction (using the MA swash tool).

All links from bellcranks to swash and above are set as per the manual.

Any ideas

Hotwings · 07-13-2006, 07:21 AM

normally you don't need as much neg as pos anyway. how much pos how much neg. what radio? Ron

CustomPC · 07-13-2006, 07:34 AM

Radio is a JR 9XII (Same as 9303).

Servos are JR DS8311 all round.

Amount of pitch is dependent on the Swash AFR setting. At the moment i have +11/-10 on collective with 0 deg at mid stick.

My big concern is the cyclic. I have +7/-6 so i'm wondering what effect this will have.

z11355 · 07-13-2006, 07:46 AM

adjust the length of the long rods from the swash to the mixers. that will alter the
centerpoint w/o changing the overall range. make sure the very short rods to the
grips are exactly the same length.

CustomPC · 07-13-2006, 08:12 AM

Ok, thanks z11355,

Once i've adjusted those rods to get the travel symetrical, what links do i adjust if the pitch at mid stick is not at zero deg.

Do i adjust the length of the bellcrank-swash rods to move the entire swash up or down, or do i adjust the short rods?

Also, what effect do the washout to flybar links have. I assume i need to adjust those to get the washout arms level at mid stick.

DavidH · 07-13-2006, 08:51 AM

Quote:

Do i adjust the length of the bellcrank-swash rods to move the entire swash up or down,

Yes adjust these rods to get the swash positioned where needed. Then adjust the rods to the bell mixer to get 0 stick and the bell mixer level at 50% travel ( mid stick).

David

07-13-2006, 07:02 AM	#1 (permalink)
CustomPC Registered Users Join Date: Jul 2005	I can't get symetrical +/- pitch Hi, I'm finalising the setup of my Spectra-G and i cant get a symetrical positive and negative pitch range. No matter what i try i always get 1-2 degrees more positive pitch than i do negative. That's for both collective and cyclic. I've started with the servo arms at 90 deg and all bell cranks are level. My swash is perfectly straight with zero interaction (using the MA swash tool). All links from bellcranks to swash and above are set as per the manual. Any ideas

07-13-2006, 07:21 AM	#2 (permalink)
Hotwings Registered Users My HF Map location Join Date: Jun 2004	normally you don't need as much neg as pos anyway. how much pos how much neg. what radio? Ron __________________ "Learn from others mistakes, you can't live long enough to make them all yourself" Hotwings' sensors, Robbe 90 Heli's, Nova, Mille III, Futura SE (2)Predator Gasser T-rex se Silver CF, T-rex 450x SE'fied night bird, T-rex SE black CF, Raptor 30os37 T-rex 600 HFE Rotorworkz,#2 T-rex 600 HFE Rotorworkz, Tiger 50 w/hyper 50 T-rex 600 Nitro Pro, YS-50, MP-5, 6100t, 9255's,Futaba 14MZ 2.4 & 72mhz

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07-13-2006, 07:34 AM	#3 (permalink)
CustomPC Registered Users Thread Starter Join Date: Jul 2005	Radio is a JR 9XII (Same as 9303). Servos are JR DS8311 all round. Amount of pitch is dependent on the Swash AFR setting. At the moment i have +11/-10 on collective with 0 deg at mid stick. My big concern is the cyclic. I have +7/-6 so i'm wondering what effect this will have.

07-13-2006, 07:46 AM	#4 (permalink)
z11355 Registered Users Join Date: Apr 2004	adjust the length of the long rods from the swash to the mixers. that will alter the centerpoint w/o changing the overall range. make sure the very short rods to the grips are exactly the same length.

07-13-2006, 08:12 AM	#5 (permalink)
CustomPC Registered Users Thread Starter Join Date: Jul 2005	Ok, thanks z11355, Once i've adjusted those rods to get the travel symetrical, what links do i adjust if the pitch at mid stick is not at zero deg. Do i adjust the length of the bellcrank-swash rods to move the entire swash up or down, or do i adjust the short rods? Also, what effect do the washout to flybar links have. I assume i need to adjust those to get the washout arms level at mid stick.

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