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Help with MULTI BLADE rotor heads


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admiral
Extreme 3D
Extreme 3D


Joined: 20 Mar 2009
Posts: 1101
Location: Brisbane, Australia

PostPosted: Tue Mar 15, 2016 3:32 am
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Hi Waleeed,

Tom is correct, I flew my EC145 450 with 4 blades without an FBL controller just to see if it would, the answer was yes it did. I had to install a set of 500 tail blades on the 450 to get enough authority, a 4 blade tail rotor would also work if you could find one.(They do exist but are rare and have problems)

I soon went back to the FBL controller, flying without it was mushy and slow responding, I may have been able to tune it a bit better but thought it wasn't worth the effort when I had the a good FBL controller sitting there with which it flew well.
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Burgess
Extreme 3D
Extreme 3D


Joined: 27 Mar 2012
Posts: 1092
Location: Wales

PostPosted: Wed Mar 16, 2016 1:14 pm
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Here's 5-bladed main with a 4-bladed tail rotor with no electronic stabilization.

https://www.youtube.com/watch?v=iMoQcBvMew4



Burgess
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Burgess
Extreme 3D
Extreme 3D


Joined: 27 Mar 2012
Posts: 1092
Location: Wales

PostPosted: Sat Mar 19, 2016 3:17 am
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Hi waleeed and welcome to the forum.

So what pitch and throttle curves setting are you using?

I posted that video link of a multi rotor heli and it seems to fly ok. It would have been useful if he'd also shown his TX set-up and the mechanical setup of the heli too.

I've not done anything with multi blades rotors yet...have thought of adding a scale fuselage to one of my T-rex 450s probably an Align EC-135. It's the tail rotor that's the problem, may just modify a pair of 450 size two-blade rotors, but a fan in the tail would look the part.

Any way I've just purchased an Align 3G from ebay, and now deciding which type of blades to get for the five-blade head. Rigid or flexi plastic, semi-symmetrical would be the best solution but their expensive (may doctor a set of symmetrical blades).


I've been hankering to do a scratch built 600 size Seaking, and have a medical procedure coming up some when soon, so the post-opp restrictions will give me the opportunity to focus on producing the drawings and maybe building.


Burgess
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tombo242
Admin
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Joined: 04 Nov 2008
Posts: 4718
Location: Santo Estêvão, East Algarve, Portugal. Now 82, but still feels 22.

PostPosted: Sat Mar 19, 2016 5:36 am
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Hi Burgess,

Hope you operation goes well. Here's me halfway through my eye lens swaps:



That's the right eye, the one I use to track models in flight, they've also done the left eye so I have good close-up vision to build them. I don't need glasses any more. Sometimes you just have to trust that the medics know what they're doing (even if you don't quite understand what they are saying).

I hope everything turns out as well for you as it did for me, I was not looking forward to going blind! Now at almost 80 I'm back to full activity again.

All the best to you my friend,

Tom.
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Burgess
Extreme 3D
Extreme 3D


Joined: 27 Mar 2012
Posts: 1092
Location: Wales

PostPosted: Sat Mar 19, 2016 9:35 am
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Thanks Tom, I'll be examined by the consultant at Bangor next month.

I've a couple of design ideas of how to fabricate a multi blade tail rotor.



Burgess
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