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HelicopterScale Model RC Helicopters › three blade vario head setup question
03-31-2017 01:31 PM  7 months agoPost 1
aashu

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scotch plains, NJ

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being my first multiblade , I am not sure if I am doing it correct and how blades should move in a 3-blade setup

It is regular vario 3 blade being setup on Alouette. I am using Brain2. Searched RR and other forums but there is no good guide that tells what are the correct settings for this head

My picth is 0 degree at center stick. The links from grip to swash are exactly 90 degree (parallel to main mast). follower is just randomly installed but I made sure it is not binding in any manner.
My question is, how should the blades be moving when I am using ailron or elevators with one blade is exactly on tail boom. I have read many different advises from many forums and I am confused.

Garden State, NJ

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03-31-2017 03:06 PM  7 months agoPost 2
don s

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Chesapeake, VA

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Line a blade up parallel to the tail boom. Give up and down elevator. If the blade over the tail doesn't move then you're phased.

If the blade does move you need to adjust the follower until it doesn't move (mechanical adjustment), or adjust phasing in your FBL unit (electronic adjustment), or a little bit of both.

This is the same procedure whether it's two blades or 100 blades.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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03-31-2017 05:29 PM  7 months agoPost 3
garyl

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taxachussetts

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One other thing to add is with the blade over the boom and you give an aileron movement make sure the blade pitches the correct way. It is possible to be reversed with the phasing.

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03-31-2017 06:03 PM  7 months agoPost 4
Grimracer

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Eau Claire WI

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aashu

you have the basic setup good on the servo position vrs the pitch. Just remember that center stick.. on your TX provides around 4-5 deg pitch.

So

Center stick
4-5 deg pitch
10 for a good start max
-3 for a good start neg pitch

The other guys got you tuned in on phasing.

Welcome!

Grim

Michael J Zaborowski

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03-31-2017 07:25 PM  7 months agoPost 5
aashu

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scotch plains, NJ

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Thanks guys

Read all the good advice and will give it a try this weekend.

Garden State, NJ

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03-31-2017 08:24 PM  7 months agoPost 6
don s

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Chesapeake, VA

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One other thing to add is with the blade over the boom and you give an aileron movement make sure the blade pitches the correct way. It is possible to be reversed with the phasing.
Wouldn't that be a case of a reversed swashplate? Is that something electronic phasing can cause?

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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03-31-2017 09:17 PM  7 months agoPost 7
garyl

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taxachussetts

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Electronic phasing will do it if you put in a -45 when you really needed a +45. Depends on the head rotation, and yes I have personal experience with this.

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04-01-2017 02:44 AM  7 months agoPost 8
aashu

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scotch plains, NJ

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Ok

Can I just use electronic phasing instead of moving the swash manually

Garden State, NJ

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04-01-2017 12:33 PM  7 months agoPost 9
garyl

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Can I just use electronic phasing instead of moving the swash manually
If you have the option you will always want to keep the links as straight as possible and use the electronic phasing.

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04-10-2017 01:41 AM  7 months agoPost 10
aashu

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scotch plains, NJ

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Hi

Can you please review and let me know if this is correct ?

Watch at YouTube

It is left hand rotation. The balde over tail boom does not move but it looks weired the way swash moves. Before I give it a go , would like to conform

Garden State, NJ

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04-10-2017 02:05 AM  7 months agoPost 11
don s

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Chesapeake, VA

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Electronic phasing will do that to swash motion. You're giving elevator commands correct?

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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04-10-2017 02:34 AM  7 months agoPost 12
aashu

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scotch plains, NJ

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Yep

It is electronic phasing. So I am wondering the way it looks spooky where one left servo does not move, how will the help move when in air

Garden State, NJ

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04-10-2017 12:20 PM  7 months agoPost 13
garyl

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taxachussetts

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Its has to do with gyroscopic precession. http://www.copters.com/aero/gyro.html

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04-10-2017 04:44 PM  7 months agoPost 14
don s

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Chesapeake, VA

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A bit more to it than gyroscopic precession. Many full scale machines are not phased at 90 degrees (and some RC models allow you to tweak the phase mechanically, many do not).

OP may very well lift off and discover some interaction between aileron and elevator, which would require further phase adjustment. This can be true for any machine.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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04-10-2017 04:57 PM  7 months agoPost 15
modtron

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Oxford. UK

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Your over thinking the issue.

When adjusting the "phasing" of the swashplate - don't go by what the swashplate is doing, only look at what the blade and rotor head are doing.

I usually only fit one blade - line it up over the centre line of the boom and then adjust the value so that blade dose not move when controlling the elevator stick.
Then, turn head 90 degrees and check that the blade dose not move when aileron control is used.
Make sure in all cases that the blade moves the correct direction though.

modtron
Oxford UK

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04-10-2017 05:39 PM  7 months agoPost 16
Raycon

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Houston, TX

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The video is correct if the blades turn CCW. WHich is usually the case in scale models.

Obviously you head does rotate CCW. You are good to go.

I have a 3 blade Power Cat using the PHT3 and BD3SX controller and I dialed in 45 degrees phasing. Cant remember is it was + or - though.

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04-10-2017 05:48 PM  7 months agoPost 17
aashu

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scotch plains, NJ

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thanks

I guess I am overthinking this since this being my first 3 blade

I took it out in my backyard and took a deep breath and gave it a go. I was able to do a hover for a few minutes. Contriols are working in right direction as well . I will have to play with cyclic sensitivity since it is very edgy.

Garden State, NJ

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04-10-2017 07:02 PM  7 months agoPost 18
garyl

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taxachussetts

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Vario rotor heads and blades are very rigid which is good for flybarless controllers but the cyclic is sensitive around center stick. Add some control expo but limit it to no more than 30%, if you need to tame it down more reduce control throws. Thats how I have been doing it for more years than I can remember and it works fine.

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