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HomeAircraftHelicopterRobbe Cuatro - Millennium - Nova - Dyna-X › Robbe S4775 196mm main shaft
06-21-2014 11:03 AM  4 years agoPost 1
Sparkhead

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Melbourne Australia

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I Robbe fans,

I'm after a couple of the Robbe 196mm main shafts part number S4775. I've tried all of the shops I know of but no luck. Anybody have a couple they want to sell or swap for some parts as I have heaps to swap.

Or has anyone modified another brand of shaft to suit their Robbe?


Mick.

Robbe & Futaba.

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07-09-2014 09:19 AM  4 years agoPost 2
Alex_SH

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Aalst, Belgium

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S4775
s4648 which is 186mm is available. i guess you can fit it to your heli.

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07-09-2014 09:51 AM  4 years agoPost 3
Sparkhead

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Melbourne Australia

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Thanks Alex. I'm after the longer version as I've fitted a RJX head which sits lower hence wanting a longer shaft.


Mick.

Robbe & Futaba.

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07-16-2014 09:09 PM  4 years agoPost 4
trillian

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London, UK

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Depending on how much higher you need you could try a Beam Avantgarde main shaft. I am using one on my Robbe electric / FBL conversion along with a Faifa cyber head.

But you need the headblock to have a lot more engagement than the stock Robbe heads because the upper Jesus bolt hole is right at the top on the Beam shaft.

I only wanted to raise the head a little bit and this gave me the choice of two mounting positions as the Kasama head has three bolt holes. (If I used the top hole it wouldn't sit any higher than it was with the Robbe shaft)

The distance below the lower bolt to the bottom of the shaft is a little shorter, maybe 4 or 5mm, so it does not go all the way through the lower bearing it goes about half way but that should be fine as I'm using a middle bearing as well.

I should also mention, there are two versions of the Beam shaft, one is solid and one is hollow and I'm using the solid one.

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07-18-2014 01:22 AM  4 years agoPost 5
Sparkhead

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Melbourne Australia

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Thanks for the info. I'm now looking at trying the get a 213mm shaft and drill some new holes in it so I can use the Ramster head. I'm looking at trying to get the shaft all the way up inside the block now that the seesaw is removed. I had a look at the Vario site and they have a good selection.

I'm led to believe if you use the hollow shaft it will be a lot stronger than the solid version.


Mick.

Robbe & Futaba.

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07-18-2014 10:02 AM  4 years agoPost 6
trillian

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London, UK

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Yeah Vario has a lot of useful stull.

Regarding hollow vs solid. A larger diameter hollow shaft will be stronger but if you take two shafts of the same diameter and material, the solid one will be stronger.

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07-18-2014 10:41 AM  4 years agoPost 7
Sparkhead

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Melbourne Australia

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Thanks for clearing that up as I wasn't all that sure. It was explained to me that the surface area of the outside of the shaft is what gives it its strength. With the hollow shaft there is the extra surface area which gives more strength. I was never sure to believe it as I didn't bother with physics at school.

Out of interest have you tried drilling a new hole in one of these shafts? I filed a burr off one of the secondhand shafts I have here and i was surprised how easy it was. I thought the shafts were hardened. I didn't want to buy Vario shafts to find I can't drill new holes in it.


Mick.

Robbe & Futaba.

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07-19-2014 06:28 PM  4 years agoPost 8
trillian

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London, UK

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I have never tried to drill a main shaft myself so I don't know how difficult it is. With the right equipment pretty much anything can be drilled.

A few years ago I modded a hex start shaft to fit an Align starter and it required two holes to be drilled which I did fairly easily with a friend's drill press. But I don't know what grade of steel it is or if it was hardened.

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07-22-2014 04:36 AM  3 years agoPost 9
Ramster

rrApprentice

NJ

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The Millenium's Main shaft is made out of annealed ETG 100 steel.
It shouldn't be hard to drill.

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07-22-2014 04:42 AM  3 years agoPost 10
Sparkhead

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Melbourne Australia

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Thanks for the reply, I've just ordered some Vario 35/21 shafts so will be drilling them soon. They are 302mm long and I need 220 total so should work out nicely.


Mick.

Robbe & Futaba.

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