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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › Would this swashplate be ok for 2 bladed rotor?
05-21-2016 12:27 AM  4 years ago
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Calil

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Would this swashplate be ok for 2 bladed rotor?
Hey guys

Time to try to assembly my Cobra. Sorry for the noob question but I'd like to know if this swashplate (picture attached under) can be used for 2 blade rotor. The reason is because the PHT2 has 4 servo slots and I don't want to use a 3 point swashplate and 3 servos, I'd like to keep the use of 4 servos.

Any input appreciated! Thank you in advance.

Calil
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05-21-2016 12:29 AM  4 years ago
Copter Doctor

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i see no reason that wouldn't work. I have used a similar setup with the 4 servo ccpm.drive a rotary, fly a rotorcraft
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05-21-2016 12:43 AM  4 years ago
Calil

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Thank you CopterDoc

I never tried that's the reason I asked, to don't risk something I never did
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05-21-2016 01:14 AM  4 years ago
Notar

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That will not work with the PHT2 without alot of work. Also, if you get it to work, you will need to introduce rotorhead phasing in it to make it work properly.
Joe
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05-21-2016 01:33 AM  4 years ago
Copter Doctor

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seems like the PHT-2 may be a different configuration that what I have used in the past. Perhaps Joe can give some details of the mods required or suggest a swash that works without having to do mods drive a rotary, fly a rotorcraft
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05-21-2016 02:27 AM  4 years ago
Mojave

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I may be wrong, but looking at the vario build sheet for the turbine Cobra, it uses a standard 90 degree swash set up. So, if that's the case, you would need to ditch the existing anti rotation pin location on this swash and use an extended anti rotation pin (with integrated ball) in one of the servo ball locations. Like the anti rotation pin used in a Rex 700 swash. Like the pin that I used in this vario swash. If these are not the mechs that you are referring to, please post a pic of what you are using in this project.
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!
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05-21-2016 03:40 AM  4 years ago
Sparkhead

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The swash you have is a Robbe. They used system 88 which had a 45 degree offset built into the head design. I used one of these with 4 servo layout and was never really happy with the interaction between the servos as there was always some binding no matter what I did. Can you show a photo of the servo layout of the mechanics?
Mick.

Robbe & Futaba.
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05-21-2016 05:16 AM  4 years ago
Margaritaman

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I have a couple extra all aluminum 4x90 12mm swashplates if you need one and I'm sure we could work something out. PM if you like.
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05-21-2016 11:16 AM  4 years ago
modtron

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There is no problem with using that swashplate and a 2 blade head.
No phasing issues, other than using the correct settings in the transmitter to get the correct swash mix required - in the case of Futaba, use H4-X.

Taken from the Vario manual for the PHT-2 Alouette...

You may want to consider changing the control balls for shorter ones ont he inner ring of the swashplate ?

modtron
Oxford UK
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05-22-2016 05:36 AM  4 years ago
Calil

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Thank you Modtron

What about the flybarless to be used with a swashplate like that? I normally use IKON but I don't know if it's compatible with a swashplate like that.
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05-22-2016 05:38 AM  4 years ago
Calil

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Sparkhead

I'll take a picture and post here

Margaritaman

Thank you Margaritaman but the pht2 main shaft is a 10mm diameter.
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05-22-2016 05:43 AM  4 years ago
old nitroman

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on the ikon can be adjustedE5s and E7se,and a 766, Roban bell 222 800 superscale,450 bell 4 bladed head,gobby 380and 420 ,180cfx
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05-22-2016 07:57 AM  4 years ago
modtron

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Just been looking at the Ikon manual and it is not capable to do a 4 servo set up.
So, your need to look at something like a Bavarian Demon, Futaba CGY750 or similar that can do the required 4 servo mix.

modtron
Oxford UK
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05-22-2016 07:59 AM  4 years ago
Sparkhead

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Melbourne Australia

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Hi Calil,

The picture Modtron showed above shows me what I needed. That swash will work unless the anti rotation bracket is in a really strange location. I use Futaba CGY750s and it's a very simple setup to get the phasing correct with the original Robbe System 88 setup as there are no servos fighting each other like you get with the 4 servo setup you will be using. Don't get me wrong the 4 servo setup I had worked but I could never totally get rid of a small amount of servo hum which indicated pressure on the servos.

Mick.

Robbe & Futaba.
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05-22-2016 01:52 PM  4 years ago
Mojave

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Looks like you're using a different set up than I thought, disregard my earlier post. I thought you had 90 degree with elevator servo at 6 o'clock, not with a 45 degree offset.
Barry
All helis and planes have an expiration date stamped on them...you only find it after you crash!!
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05-22-2016 02:15 PM  4 years ago
Calil

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Brazil

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Thanks all for the reply. In that case (ikon not supporting 4 servos) I'll go easy way: 3 servos and 3 servos swashplate. I have already ikon and the H3 swash so no need to spent more money.

Thank you all really! I would never figure that out alone!
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05-22-2016 02:54 PM  4 years ago
Sparkhead

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Looks like it'd be much easier to use a different gyro rather than try to get a 3 servo swash to work with those mechanics. The Futaba CGY750 is a pretty user friendly setup. There is even a H4-45 option in the swash type for the setup you have.
Mick.

Robbe & Futaba.
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05-23-2016 08:03 AM  4 years ago
Calil

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Brazil

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Thanks sparkhead

I will take a look on the 750!
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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › Would this swashplate be ok for 2 bladed rotor?
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