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HomeScaleAircraftScale HeliScale Helicopter Main Discussion › SAB0420 tail blades
04-24-2016 12:43 PM  31 months agoPost 1
Sparkhead

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Melbourne Australia

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Hi all,

I've just converted my 1.8m BK117 to 4 blade head and am having a bit of a problem with the tail blowing out. At the moment I have what I think are 125mm MAH blades on there and even running quite a high head speed the torque would seem to be to much.

It would seem that I may be able to get a set of SAB0420 blades locally which I believe are 130 x 30 square ended blades. Can anyone confirm the size and whether they are a good choice.


Mick.

Robbe & Futaba.

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04-24-2016 05:41 PM  31 months agoPost 2
MattJen

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UK

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They are good scale tail blades, I have used them on all my large turbine models.

On my 1/5 scale longranger they were fine, my head speed was 1180/1240. On my Zealous which is running a higher head speed they are fine..

The size is correct 130mm x 30mm symmetrical . I painted mine for added scale look, I like them as they have the square end.

I found the MAH scale blades 150mm were too big at the root (8mm)for most tail grips and had to be filed down which is never a good idea.

PS::

Are you sure the blades you currently have are indeed 125mm ? cos MAH I have found from the past only do 85,90,95,105,115,130mm,150mm they don't do a 125mm size, which could be the reason why your getting blow out..

All The Best

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04-24-2016 05:51 PM  31 months agoPost 3
Sparkhead

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Melbourne Australia

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Beauty!! Thanks Matt. The old ones were fine right up until I added the extra torque with the 4 blade head. Hopefully these SAB's will do the trick.


Mick.

Robbe & Futaba.

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04-25-2016 09:17 AM  31 months agoPost 4
Andy01

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Brisbane, Australia

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I have some MAH Extreme 150 x 41mm blades on my Baumann EC-145 (4x 820mm main blades) running at 1050rpm, and the tail is solid. They do have 8mm roots, which works well with my M Copter tail rotor.

http://www.ercmarket.com/mah-blades-150mm-mah150xt.html

The next size down is the MAH Extreme 130 x 36mm blades and they look a bit different (IMO) to the ones in the photo. I think the ones in the photo look more like the standard black MAH blades, which ERC only has up to 115mm.

http://www.ercmarket.com/mah-blades-130mm-mah130.html

Colin

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

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04-25-2016 10:29 AM  31 months agoPost 5
Sparkhead

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Melbourne Australia

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Thanks Colin,

I ordered the SAB0420 from Perthrc today so I'll try them first. If they don't suit me I'll give the 150's a go.

Just a quick question, now that I've decided to go CCW and I'm happy with the head I'm going to proceed with a set of asymmetricals from Kai. Do you know if asymmetricals make any difference to the torque created compared to the Spinblades I have on it now? Oh yeah, the Spinblades are symmetrical so.


Mick.

Robbe & Futaba.

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04-26-2016 09:15 AM  31 months agoPost 6
Andy01

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Brisbane, Australia

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Not sure about the aerodynamics, but if the Spins are lighter than the HeliTec blades, that could affect the torque. AFAIK heavier blades require more tail thrust to counteract the torque, but maybe someone else here can confirm.

Colin

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

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04-26-2016 10:11 AM  31 months agoPost 7
Sparkhead

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Melbourne Australia

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I got an email today and unfortunately I won't be getting the SAB 130mm tail blades. Time to start looking for something else. I'd really like to get something like the SABs above as that's what shape they are on the full size. I've got some NHPs here that are the correct shape but they are only 105mm.


Mick.

Robbe & Futaba.

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04-27-2016 12:25 PM  31 months agoPost 8
MattJen

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UK

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NHP DO A SET 135MM,
I used a set of them also on a turbine pod and boom.

https://www.modelhelicopters.co.uk/...tor-blades.html

PS
If you ever get into perth RC and meet Brian, tell him to get some spares for us few zealous flyers still around LOL

All The Best

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04-27-2016 01:09 PM  31 months agoPost 9
Sparkhead

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Melbourne Australia

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Thanks Matt,

I met Brian a couple of times. I got to see the big turbine long ranger he had fly at one of the fun flys we had in Melbourne. Surely he'd have some spares there?

I'm getting some blades from HeliTec-Der Blattschmeid and he has just gotten back to me with some nice tail blades.


Mick.

Robbe & Futaba.

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