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02-19-2020 06:01 PM  5 months ago
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Lazflyn

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Utah

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S4615 ring gear interest
Hey guys,
I now have all the parts for my Millennium 60 build except for the tail drive gear. I have looked everywhere to find one online.

I am looking into getting this gear machined out of Delrin. Thanks to Robert (Roby) from Slovenia for the CAD file! I am wanting one for the build and some spares in case they get chipped on a bad auto.

Is there any interest with you guys in having a few spares? The price goes down a lot with more machined up. I'm not looking to make anything off this. I just wondered if some other Robbe guys are needing or wanting a few S4615 gears.

Please consider how much you would be willing to pay and how many spares you are interested in.

Ballpark: 30 gears would make the price about $50 each. If there's not 30 gears of interest, I will chip in more to reduce the cost.

Thank you,
Mark

From HobbyProsDepot.com:
Robbe S4615
0Reviews
Price: USD$44.90

Stock Status:Contact us for availability

Availability: Discontinued
Product Code: S4615
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02-19-2020 10:39 PM  5 months ago
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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/
/

My Robbe futura has same auto gear, I think...

/
Saludos cordiales,
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02-19-2020 10:49 PM  5 months ago
Lazflyn

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Utah

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Yes that is correct.

S4615 gear fits the Futura, Cuatro, Nova, and Millennium.

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02-20-2020 02:34 PM  5 months ago
dela

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Stillwater Oklahoma

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I suspect Robbe had a good reason for making the part half aluminum and half plastic .... but I don't know what that reason was. My best GUESS is that it was more related to STIFFNESS rather than STRENGTH. If the gear section deflects downward too much under load, then we have poor tooth contact.

With the gear installed, is there enough space between this crown gear and the main gear below it to allow beefing up of this all plastic gear, to increase its stiffness to that of the original part?

I don't think this replacement part must or even should be identical in shape to the original, since we are changing the material.

Ron D
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02-20-2020 08:01 PM  5 months ago
Lazflyn

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Utah

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A previous post, the designer Robert said this:
Roby S 4615 crown gear 3D model
Hi to all robbe lovers out there.
It is almost impossible to get S 4615 crown gear to buy so with help from Ron Amster - Ramster and my local CNC friend with 5-axis machine we made 3D model and milled gear from Novilon Oilon plastic and it works perfect for more than 100 flights until now. Gear is the same as when I put it on my heli. Gear is redesigned to be thicker because is all made from plastic - no metal center part.
If anyone needs 3D model to make his gears please write me your email and I will share file for free because I know how hard is to get spare gear.

Hope this helps to keep our robbe helis in the air for many years to come

Kind regads, Robert.
The design has been compensated for the lack of metal in the design. Robert has over 100 trouble free flights on the all plastic design.

If you guys are wanting the original composite design, the cost would increase. I will look into that option. Robbe also made a change to their design. So even Robbe knew there was a better option out there.

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02-20-2020 08:34 PM  5 months ago
dela

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Stillwater Oklahoma

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Perfect answer !!!!!
Ramster has certainly earned his reputation in the Robbe world.
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08-02-2020 02:29 AM  2 days ago
dela

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Stillwater Oklahoma

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There is a nice looking crown gear mixed in with other Mille parts, on another site. Asking price is reasonable.

Am I allowed to say the name of that site here?
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08-02-2020 09:16 AM  2 days ago
Yeager

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Cascais, Portugal

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dela Am I allowed to say the name of that site here?
Are U referring to Helifreak? 😱🤳🏽😂
Robbe Nova Cuatro Gas/Nitro, Futura Nova Nitro, Futura SS Nitro, Vario Scale S300C/1002/21 Gas. H9 Piper Pawnee 40 Nitro, AeroWorks Extra 300 Gas.
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08-02-2020 05:18 PM  1 day ago
dela

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Stillwater Oklahoma

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No. This is an RC site where GROUPS of people discuss all things RC related. :O)
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08-02-2020 05:21 PM  1 day ago
Yeager

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Cascais, Portugal

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dela GROUPS
Ahh. Ok, my mistake! I wouldn’t
Know where that would ever be.. LoL.
Robbe Nova Cuatro Gas/Nitro, Futura Nova Nitro, Futura SS Nitro, Vario Scale S300C/1002/21 Gas. H9 Piper Pawnee 40 Nitro, AeroWorks Extra 300 Gas.
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