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HelicopterScale Model RC Helicopters › Multi blade head phasing
11-05-2013 02:02 PM  4 years agoPost 61
Love the Lama

rrNovice

Braeside, Ontario, Canada

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hi keygrigger. great discussion and resources

while i hope to move up to the kind of scale you fellas are working with, my first mullti-blade CP is the 4F200LM AS315B by Walkera. Notwithstanding some of its limitations, i am working on getting her into the air, but have some issues that perhaps you can help me with.

the mechanical phasing is just like your AS350 - my pitch rods are connected to the grips/pitch horns on the leading edge side and connected to the upper swash plate 90 degrees ahead of the span-wise axis of the blade. the rods are not vertical. the master blade over the boom does as you've described. all good.

the gyro compensator is working the swash in the proper direction as well.

on my test stand, however, i get:
- forward cyclic  causes the helicopter to roll left
- backward cyclic = roll right
- right cyclic  = pitch forward
- left cyclic = pitch backward

can you advise please ?

my set-up is per part 2 of your video

the CF blades fitted to this little bird are not scale and quite stiff

great diagrams, by-the-way !!

best,
LTL

P.S. long-term goal is to work towards your AS350

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11-05-2013 03:30 PM  4 years agoPost 62
Thumper217

rrApprentice

Slidell, LA - USA

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LTL,

Don may know better than me so you may want to wait until he chimes in but it sounds to me like your phasing is off by 90 degrees. I am not real familiar with the newer Walkera helicopters but phasing is most likely handled electronically through the stablization electronics. I would try to orient your swash so that the linkage rods are parallel to the main shaft and give that a try. A picture of the head and swash set up would be helpful too.

Andrew

Thumper

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11-05-2013 05:18 PM  4 years agoPost 63
Love the Lama

rrNovice

Braeside, Ontario, Canada

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thanks very much, andrew.

yeah, the cyclic response sure seems 90 degrees off. the mechanical set up is "out-of-the-box". everything looks good in terms of "over-the-boom" and transverse pitch checks.

i have always based my thinking on resulting rotor disk tilt should be same as input swash tilt. i'll post a photo when i get home tonight, but as mentioned, it looks just like the second part of don's video.

i cannot imagine that my situation is very unique as i see many folk flying these little birds out of the box.

i've come down from a 450 size two-blade CP, so the head speed is a little intimidating; and she is such a pretty machine with rather soft gears so i am proceeding with great caution

regards,
mike

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11-05-2013 05:48 PM  4 years agoPost 64
coptercptn

rrElite Veteran

Mesa AZ. USA

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Easiest quick check is to place one blade directly over the tail boom (it doesn't matter which blade or number of blades on the head)... Set collective to mid stick and move cyclic forward/aft (Elevator). Be sure not to put any lateral input into the stick (Aileron). If the blade over the tail moves...(Changes pitch) you are not in phase. If it doesn't you're golden...
Easy peasy..

Home of the "Sea Cobra".....

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11-05-2013 06:05 PM  4 years agoPost 65
Love the Lama

rrNovice

Braeside, Ontario, Canada

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thanks, coptercapt. yep, we're golden on the over-boom check.

still a little worried about gyro and rx adjustments .. little experience on this bird.

best wishes,
mike

p.s. you scale guys give me and my granddaughter great inspiration, so i'll pipe in here and there with an update, and when i get into legit scale. i am thinking align and then either mechanics and fuse for an AS350 or a Bell CUH-1N .. the two machines i have the pleasure of flying in for my work

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11-06-2013 07:12 AM  4 years agoPost 66
Keygrigger

rrVeteran

Mississauga, Ont. Canada

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It did sound like the phasing was off by 90 degrees. Be careful as one of my setups that you see, has the phasing reworked to have the swash tilt the same direction as the full size AS350. That system works like a charm but you really need to wrap your head around what the full size mechanics do when an input is given to them from the sticks. Even now, when I put the model on a table and start up the electronics, I get some really wide eyed looks when I push forward on the stick. I wouldn't change my setup for all the tea in China, lol. Take care.

Don

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HelicopterScale Model RC Helicopters › Multi blade head phasing
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