RunRyder RC Helicopter Topic - Hirobo Freya Need Softer dampeners for SSZ-4 head for hover

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HIROBO Turbulence - SDX - Freya - Sceadu > Hirobo Freya Need Softer dampeners for SSZ-4 head for hover

MoneyPitVictim
Key Veteran
Location: Dayton, Ohio

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Got a SSZ-4 head for precision flying, not 3d, and the stock dampeners seem just too stiff.

There are no options on the D3 parts list, and Can't find a parts list for the SDX as someone indicated those may work.

Anyone got a part number?

Gordie? Ben?

10-29-2009 05:59 PM

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kej
Senior Heliman
Location: Denmark

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The top F3C guy here in Denmark uses some orings instead of the inserts.
I believe he said some MA o-rings fitted directly.

I'm a model heli pilot, If you see me run please try to keep up!

10-29-2009 06:10 PM

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MoneyPitVictim
Key Veteran
Location: Dayton, Ohio

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O-rings from an old XCell head?

10-29-2009 06:18 PM

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pwood
Key Veteran
Location: Dubai - UAE

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Hi

The sdx dampers are softer than the d3. It is also completly rubber, not steel tube/rubber like the d3.

The sdx manual is availabe as a download on the Hirobo site. There is a link here on RR.

Regards
Paul

10-29-2009 07:14 PM

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R.J.
Senior Heliman
Location: SF bay area, CA USA

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SDX SWM manual:
http://model.hirobo.co.jp/parts-lis...jm3-0403952.pdf

Looks like FZ-V Damper Rubber is part #: 0412-296

Regards,
Rick

10-29-2009 07:39 PM

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MRC-Hirobo
rrAdvertiser
Location: Edison, NJ

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Yes the SDX dampener is the way to go. Almost all of Hirobo the precision F3C / FAI guys are flying the SSZ-5 head with the SDX dampeners.

-Greg G.-

10-29-2009 08:10 PM

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Dr.Ben
rrProfessor
Location: Richmond, VA, USA

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Just installed them in my model, and Gordie did as well just a while back. They make a great head even better for this application. Make sure you lube them up well with silicone grease.

I would not use o rings. O rings of the size which fit this head will not offer ideal head axle control in flight, especially in hard aeros. Furthermore, small o rings such as the ones that would fit are not at all durable in this application. You'd be changing them all the time to even begin to achieve any degree of consistency from flight to flight. We learned this the hard way with the MA Tempest FAI heads. The Hirobo dampers last a LONG time.

Ben Minor

Representing
MRC Hirobo Helicopters and Team Futaba for Radios
Morgan Fuels
OS Engines

10-30-2009 01:50 AM

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Chris.C
Senior Heliman
Location: Hong Kong

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I also put in the SDX dampers for around 10 flights.

Its way better than the stock for FAI type flying. I removed the center bearings as well in my IV head.

10-30-2009 03:46 AM

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MoneyPitVictim
Key Veteran
Location: Dayton, Ohio

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Quote

would not use o rings. O rings of the size which fit this head will not offer ideal head axle control in flight, especially in hard aeros. Furthermore, small o rings such as the ones that would fit are not at all durable in this application. You'd be changing them all the time to even begin to achieve any degree of consistency from flight to flight. We learned this the hard way with the MA Tempest FAI heads.

I remember well reading one of you old posts on that subject, and was skeptical on the o-rings. Flown plenty of XCells and know what that feels like.

Thanks for help guys!

Santiago

10-30-2009 04:07 AM

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Dr.Ben
rrProfessor
Location: Richmond, VA, USA

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Chris,

I did that too on my center teeter. I think that will improve hover more now that the axle has the ability to lead-lag just a bit.

Ben

Representing
MRC Hirobo Helicopters and Team Futaba for Radios
Morgan Fuels
OS Engines

10-30-2009 05:03 AM

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Mike0251
Senior Heliman
Location: Hills of the Blue Ridge VA

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Will these fit the SSZ-III as well? The new head on my EX has the black hard dampeners. I do have a used set of the white SSZ-III in the drawer but seems from what you'all are saying these are softer?

AMA 3096

11-04-2009 10:49 PM

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Dr.Ben
rrProfessor
Location: Richmond, VA, USA

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No Mike, these are about 12 mm long urethane tube-like affairs that slide over the blade axle. IV/V heads are axle heads versus the offset teeter III/VII/VIII heads. Hirobo has some hard black dampers as well as soft black ones. I have some soft ones left over I think. If I do, I'll send them up with your blades.

Ben

Representing
MRC Hirobo Helicopters and Team Futaba for Radios
Morgan Fuels
OS Engines

11-05-2009 12:29 AM

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Mike0251
Senior Heliman
Location: Hills of the Blue Ridge VA

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Thanks! I did not know they had soft black ones, I was assuming. I will pull them out and put them under my durometer gage and check them (finger)

So then there are 3 for the SSZ-III? White and two blacks correct? Where do the black soft ones fit in the scale of things, after or before the white ones?

AMA 3096

11-05-2009 01:23 AM

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Mike0251
Senior Heliman
Location: Hills of the Blue Ridge VA

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I still don't believe the blacks are soft. So Ben post your findings please. This is all I have been able to find for the SSZ-III head. Sorry guys not trying to hijack this thread.
0414-389 60 duro white
0414-414 80 duro black
>>?<<<

AMA 3096

11-05-2009 11:35 PM

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pwood
Key Veteran
Location: Dubai - UAE

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Hi Mike0251

You can use: 0404-744 and 0404-811 on the SSZ-111 head.

They were for the SSR7 for F3C flying. They have more rubber and need a longer bolt as the bolt is not recessed like on the 0414-389/414.

Unfortunately i cant remember which is hard, I can remember that the same hardness rubber on the 0404-xxx vs 0414-yyy gives a much softer feel because of the extra rubber.....

I am sure Dr.Ben will be able to give more info....

Regards
Paul

11-06-2009 06:15 AM

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Dr.Ben
rrProfessor
Location: Richmond, VA, USA

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60 D BLACK dampers from the SSR-V head: http://modelrectifier.com/search/product-view.asp?ID=4312

70 D BLACK dampers from the SSR-V head:
http://modelrectifier.com/search/product-view.asp?ID=4302 Yes, I know they don't say 70D on the website, but I have the original X-Spec manual which uses these dampers and which references them as being 70D.

Both of the choices above will fit the III series heads. Mike, I have a 60 D BLACK set here.

The 60D WHITE dampers are functionally MUCH harder than either of the choices I mention above. They changed the bonding process between the inner cup and the rubber plus the material for improved durability.

On my own SSZ-III heads, I used the 70 D 404-811's with no issues. The heads would run comfortably under 1500 rpm with no mast bumping. Anything softer than a damper which allows you to run the slowest headspeed you need is likely to undermine hover performance in the wind and soften cyclic authority upstairs.

Ben Minor

Representing
MRC Hirobo Helicopters and Team Futaba for Radios
Morgan Fuels
OS Engines

11-06-2009 06:43 AM

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pwood
Key Veteran
Location: Dubai - UAE

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Hi guys

Went and checked my EX2 manual......as usual Dr.Ben has ALL the good/correct info.

0404-811 = 70 duro
0404-821 = 60 duro

Regards
Paul

11-06-2009 06:46 AM

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Mike0251
Senior Heliman
Location: Hills of the Blue Ridge VA

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Excellent. I found those too last night with part numbers but were unsure if they were acceptable to use. And I did search the heck out of RR as well. Good stuff and I thank you gents very much. Just doing some minor tweaks to get the best performance I can.

AMA 3096

11-06-2009 11:13 AM

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HIROBO Turbulence - SDX - Freya - Sceadu > Hirobo Freya Need Softer dampeners for SSZ-4 head for hover

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