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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › Leading or trailing edge on mulit-blade heads
10-21-2015 02:42 AM  4 years ago
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trekrider586

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Sylacauga,Al

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Leading or trailing edge on mulit-blade heads
Hi all,
I have searched this topic, and would like to get some more info.
I am setting up R\C Aerodyne 4 blade head on my Agusta 119
and am wondering what way to set it up.
Specs :
TT Agusta 119
Raptor e550 stretched
Mini V bar.

I know some brands have either, so wanting to know who's doing what and if it flies better one way or the other.
it's better to ask for forgiveness than for permission
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10-21-2015 03:06 AM  4 years ago
marc28

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new york

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Leading edge East Coast scale helicopter Field Rep
Vario Team Pilot
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10-21-2015 03:15 AM  4 years ago
grim.the.grim

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Houston, Texas

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Why wouldn't someone have the blades rotating with the leading edge??? I am about to start a scale bird and this is new to me also. ( I hope this is not seen as highjacking your thread).*** Real Pilots BEAT the air into submission! ***
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10-21-2015 09:25 AM  4 years ago
Andy01

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Since it is pretty obvious that the actual blades have to rotate leading edge first (I have tried one the other way, and it didn't work too well ), I am assuming that the question was referring to leading or trailing edge control ?

If so, IMO leading edge is better.

Colin
Vario Long Ranger 700e
Seahawk 600
UH-1N 500
Baumann EC-145 800+ (coming soon )
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10-21-2015 11:43 AM  4 years ago
Notar

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The minute you change from leading edge to trailing edge, your phasing must change as well. If not, it is not phased properly.
Joe
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10-21-2015 12:34 PM  4 years ago
garyl

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I have setup a vario cobra with both leading and trailing edge control and it flew the same either way. The only difference is the swash will be reversed for positive pitch using trailing edge control, it will go down for positive pitch.
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10-21-2015 01:24 PM  4 years ago
grim.the.grim

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I am assuming that the question was referring to leading or trailing edge control ?
Dough!!! Now I feel like a total dork!
*** Real Pilots BEAT the air into submission! ***
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10-21-2015 05:17 PM  4 years ago
Notar

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The phasing change is only for 3,4 5,or 6 blade heads, since two blade heads need no phasing.
Joe
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10-21-2015 05:51 PM  4 years ago
Copter Doctor

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I have setup a vario cobra with both leading and trailing edge control and it flew the same either way. The only difference is the swash will be reversed for positive pitch using trailing edge control, it will go down for positive pitch.
clearly the question was not made clearly. I believe its being refered to the pitch control arm on the blade grip in reference to the direction of rotation.
GaryL you hit it rigtht on the money. I prefer the swash to go up with positive pitch being achieved than the other way round. either way it shouldn't matter to how it feels or flies.
Now, I thought the rca heads came withthat arm that automatically phases the head?? it should be no issue at all.
drive a rotary, fly a rotorcraft
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10-21-2015 06:13 PM  4 years ago
Notar

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Swashplate direction becomes an issue, for instance, with a Vario head, left hand rotation, leading edge control;
Swashplate tilts forward and to the right for forward cyclic.
If the control is on the trailing edge, forward cyclic has the swashplate going forward and to the left instead.
So its more than just an arm controlling the phasing if you move it. If its made one way, for one direction and not needing phasing, thats something different altogether.
Joe
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10-21-2015 07:07 PM  4 years ago
Copter Doctor

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Joe is correct. Phasing for either way is different. I think its simpler and less taxing in the Brain to have the grip control arm positioned in the direction if rotationdrive a rotary, fly a rotorcraft
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10-21-2015 07:46 PM  4 years ago
trekrider586

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Thanks for all the answers guys.
The head in question is the Rodan 4 blade from R/C Aerodyne.

it's better to ask for forgiveness than for permission
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10-21-2015 07:53 PM  4 years ago
trekrider586

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See how I have it? Was wondering if that was the correct way. I was thinking that is the way it was supposed to be. What confused me is that 3 out of the 4 blade grips had the blade bolts inverted,(nut at top) and got to thinking about it when I flipped the grips over and saw it could work that way as well. As far as the phasing is concerned, I have the head located with the jesus bolt so that the blade grips are lined up with the swash balls.it's better to ask for forgiveness than for permission
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10-21-2015 08:36 PM  4 years ago
don s

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Chesapeake, VA

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As long as it phases properly it won't matter for a scale application.

Your picture looks fine.
E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.
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10-22-2015 10:19 AM  4 years ago
Andy01

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Brisbane, Australia

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The photo looks OK if it is CW / RH rotation for leading edge control, but if it is CCW / LH rotation, then it should probably be the other way.

It seems a bit odd to have the bolt at the bottom and countersunk nut at the top. You would probably need a standard L-shaped hex key rather than a hex driver because you may not have space between the fuselage and the grip.

Colin
Vario Long Ranger 700e
Seahawk 600
UH-1N 500
Baumann EC-145 800+ (coming soon )
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10-22-2015 02:17 PM  4 years ago
trekrider586

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Thanks guys, Emile, Joe, Don s, Colin, Garyl, Marc28, Grim.
I am going to use the blade bolts as we would normally do, nut at bottom. The grip has the nut hex on both sides, and I would just think it would work and look better the "normal" way.
Colin, I am also going with the RH rotation so we should be good with the setup.

When I get off work today, we will put it back together and see how it flies.
it's better to ask for forgiveness than for permission
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10-27-2015 09:46 PM  4 years ago
trekrider586

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Update
well, still haven't a chance to fly. I was having a little play in the links on the swash, so I got the bright idea of changing the balls out...well, 70 bucks later and waiting for the parts to come in.
Upon taking the balls out they broke off in the swash, I intend to try and drill, but ordered a new assembly anyway.
it's better to ask for forgiveness than for permission
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10-27-2015 11:36 PM  4 years ago
Heli Fanatix

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Fountain Valley, CA

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99% of the RC Heli are CW and the other 1% CCW are for scale. Unless you are a die hard scale builder ... stick to the conventional CW rotation with leading edge. they all fly the same once properly setup.

That head from RC Aerodyne are really nice and have the phasing built in. No adjustingment needed. Go for leading edge with the orientation of your main rotor grip arms are shown on the your image.

Once done, put mutli-color tape and track one by one. I suggest a 2000 HS(assuming 600mm baldes... maybe 1600 for 690's) with -3/+8 collective to get a good feel of hose the heli flies b/4 dropping the HS any further. The cyclic are quite reactive. I would rather tune the agility instead of adding expo.
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10-28-2015 09:50 AM  4 years ago
Andy01

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2000rpm for a 4 blade scale heli

Sorry, but I have to disagree. 1350 to 1400rpm is fine for a 4x 600 scale heli unless the OP plans to do stunts with it.

Colin
Vario Long Ranger 700e
Seahawk 600
UH-1N 500
Baumann EC-145 800+ (coming soon )
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