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HomeAircraftHelicopterHIROBOHirobo Freya › OS105: too much for the Freya ?
10-27-2012 01:05 PM  5 years agoPost 1
filou406

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Lexington SC US

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Hi,
Few weeks ago I have installed an OS105 in my Freya with the 7.92 ratio (white 95t delrin gear).
Like this the bird is fantastic, the engine just pulls. However, after 7/8 flights, I started to hear a bad noise. I stopped and I saw a lot of white powder on the frame. The main gear was just completely worn off.
I have the carbon frames, 3 bearings for the main shaft, the clutch is pretty new, and then I am wondering if this gear can support the torque of the 105.
Your thoughts ?
Thanks

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10-27-2012 03:49 PM  5 years agoPost 2
nytflyer

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Temasek

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ive been using the fluorine grease for the main gears. same 95T gear except that its electric....no harm trying

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10-28-2012 11:41 PM  5 years agoPost 3
Blue Angel

rrApprentice

Redford, Mi - USA

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filou406: Sounds to me like you've answered your own question!

Blue Angel

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10-29-2012 12:00 AM  5 years agoPost 4
filou406

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Lexington SC US

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Then you think that I cannot run the os105 with 30% nitro in the Freya..... Could it be a distance issue between the clutch and the main gear ?
Thanks

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10-29-2012 02:07 PM  5 years agoPost 5
Hoggy42

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Australia

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I can't see any reason why the 105 would be too much for the gear Part number 0404-707 EX Maingear 95t is listed as a option part for the new D3 V2 which is designed around the 105 and I'm pretty confident that Hirobo test the hell out of these things.

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10-29-2012 04:28 PM  5 years agoPost 6
hgh001

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New Zealand

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Hi filou406,

I ran a YS120 in my Freya, used to took the beating very well.

I used a 11T pinion (0414-404) and the EX 91T main gear (0414-454), thus 8.27 ratio.

No wear on the main gear, never applied any type of lubricant.

The OS105 can't be too much for the Freya.

HGH

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10-30-2012 12:51 AM  5 years agoPost 7
filou406

rrApprentice

Lexington SC US

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I have been using the same ratio as you (8.27) for 2 months without issue. But last month I changed it to the 7.91 which fits better with this engine but the 404-707 gear lasted only 7 flights.
Anyway I ordered a new one yesterday and I will test it again. I hope that it was an material issue...

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10-30-2012 01:41 AM  5 years agoPost 8
Dr.Ben

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Richmond, VA, USA

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Taller gear ratio increases the load on the driveline. Examine the pinion closely for any sign of machining error.

I have seen this happen with 7.91 on a 0.91. The problem is that with the fixed gear spacing othe Freya, there really is no perfect mesh, and the more teeth on the pinion, the less they are really shaped like teeth and the more likely they are to wear the maingear. Using the grease is a good idea. Watch the gear closely between the first few flights to see if it warns of a repeat. 8.27 is an ideal ratio for the 105 for 3D, so I would not beat your head against a wall and risk the model when the underlying cause is really the pairing of that pinion with that maingear.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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10-30-2012 11:39 AM  5 years agoPost 9
Mike0251

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Hills of the Blue Ridge VA

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The use of shim stock under the engine mounting flanges is an alternative should you find that all the tolerances went the wrong way and you have a slight binding instead of a slight amount of lash.
Also there is usually a tiny bit of play in the motor mount to frame bolts. Snug up the engine to the mount, loosen the mount to frame and check to see it you cannot "tip" the engine back and forth toward the main gear. It should move a slight amount, maybe. Then sneak up on the tightening sequence of the mount to hold your setting. Its not just bolt the parts in and go, its look closely as you build the power sub assembly for any subtle anomalies.

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10-30-2012 12:30 PM  5 years agoPost 10
filou406

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Lexington SC US

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Thank you for the tips, I will try to move the engine, I will add some grease and check the gear after every single flight the see if it starts again.

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11-12-2012 05:26 AM  5 years agoPost 11
filou406

rrApprentice

Lexington SC US

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Sometimes I wonder why I put so much money in this bird when my $300 TRex 700 performs so close!
I bought a new clutch + a new gear for $90 (!!!) I added some special grease, I put everything together this week and I flew twice this week end. High power, no noise, very happy with this until I checked the gear. The teeth are already deformed and I am sure now that I am not going to fly more than last time before it will be gone !!!
What are you doing Mr Hirobo ??? I have bought all the options for this bird, I can not add more but it still doesn't work !

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11-12-2012 11:01 PM  5 years agoPost 12
payne1967

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uk

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i would go back to the 8.27 ratio
and enjoy

and the trex has yet another new main gear in devolpment
i've seen one its thicker and wider than the old one
and having a trex 700 strip its main gear every flight with a 91c spec inside i would go back there again
my turbulence is a more economical heli to run than my 700 was

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