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01-03-2013 02:06 AM  7 years ago
Topic Vote0Post 1
richardf

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San Diego, CA USA

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New JR head
I have ordered the new JR 3 blade head and it will be here in a couple of days.

-Richard
AMA 4628
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01-03-2013 03:43 AM  7 years ago
richardf

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Rumor has it you can run a head speed of 1400 for hovering.

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01-06-2013 12:12 AM  7 years ago
richardf

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Test hover in the backyard was fun

It will take some time to sort out the BeastX unit, but the 1400 RPM hover was pretty cool.
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01-06-2013 04:15 AM  7 years ago
rapidity

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ohio

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How'd u fit it to a 10mm shaft?
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01-06-2013 07:59 AM  7 years ago
olaf

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poland

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Richardf, can You try 1300 rpm?
I am hovering on 1400 with 2 blades fbl. So i was thinking that with 3blades can do it lower.
Olaf
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01-06-2013 08:18 AM  7 years ago
darren heaver

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rochester, kent, england.

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Nice head !!
Great looking head bet it sounds good at 1400 or lower with 3 blades ? What's the awash layout 120 deg or 140 deg ?

Cheers Darren.
" one day I will learn to fly till then I will just hover"
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01-06-2013 11:02 AM  7 years ago
rapidity

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ohio

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Problem is the range of rpm you can achieve. Hard to achieve a low and high rpm in a suitable range. That's where I'm thinking 3 blade suffers, is in the upstairs department.
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01-06-2013 03:16 PM  7 years ago
richardf

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Rapidity - This is the MB-351 head and is made for a 10mm shaft, if you see the video of this head in hard core 3D action, it will be plenty strong for my style of flying. The MB-391 head is made for 12mm shafts.

Olaf - I will try 1300 RPM and let you know what the difference is compared to 1400.

Darren - I am using 140 degrees right now, although the swash has both options.

This is all just a exercise for me, building the foam 3 blade holder for the blades when folded was interesting too.

-Richard.
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01-06-2013 03:27 PM  7 years ago
richardf

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A closer shot
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01-06-2013 04:07 PM  7 years ago
Dr.Ben

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Richmond, VA, USA

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Based on what I have seen from the recent FBL contest in Japan and what they learned in testing of most current CGY750 firmware, little if anything is being left on the table in the use of the 3 bladed heads for contest use. In another year or so it will become very clear the way to go.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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01-06-2013 05:43 PM  7 years ago
KevinB

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Earth

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So when you crash a 2-bladed head, you replace the spindle. When you crash one of these, do you need to buy a whole new machined head yoke??

KevinB
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01-06-2013 06:29 PM  7 years ago
richardf

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There are three spindles and they cost about 18 USD (corrected) for the package used on the MB-351 head.

-Richard
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01-06-2013 06:42 PM  7 years ago
olaf

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poland

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01-06-2013 08:07 PM  7 years ago
rapidity

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ohio

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Can u run 14mm blades or just 12?
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01-06-2013 08:42 PM  7 years ago
richardf

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I was surprised that it will take 14mm blades.

-Richard
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01-07-2013 01:58 AM  7 years ago
Chris.C

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Hong Kong

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As far as I know, the MB351 is for 600mm blade size and is good for JR's 8 cells series helicopters.

From the Caliber's 3 blade head experience, the lower rpm can be achieved by using smaller motor pinion.
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01-08-2013 12:18 AM  7 years ago
Santiago P

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Dayton

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So when you crash a 2-bladed head, you replace the spindle. When you crash one of these, do you need to buy a whole new machined head yoke??
As far as I know, crashes during f3c style practice or competition are the most rare occurence.

But If you everplant one of these at high speed, the last thing on your mind will be a broken head hub.

Now this 3 bladed head is making me very curious. I can now see how one can achieve lower headspeeds silky behavior without compromising the control per rev for the FBL unit... hummm

very high rpms (~2000) would not be needed becasue the responce and stability from the 3rd blade. It "should" groove around 1800 (or lower).

Richard,
Are you are running 700mm blades?

Santiago
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01-08-2013 12:25 AM  7 years ago
richardf

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San Diego, CA USA

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Santiago,

They are in fact 710s, with the slightly reduced span across the grips and with 95 tail blades, there is no overlap.

Hoping to test at the field this weekend with a headspeed of 1300.

Edit: Sunday that is, Saturday is the AMA show @ Ontario!

-Richard
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01-08-2013 12:33 AM  7 years ago
Santiago P

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Dayton

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Best of lucks.

S
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01-08-2013 01:31 AM  7 years ago
nytflyer

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Temasek

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SWEET!
Been having the idea for quite sometime now...dunno whether higher headspeeds will have any effect on the mb351 head or should i go the K&S way...?
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