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Home🏆Contest✈️Aircraft🚁Helicopter🏆Aerobatic FAI F3C F3N Contest › OS 105HZ or HZ-R for F3C?
08-01-2012 08:32 AM  9 years ago
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iyoy

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Bacolod City, Philippines

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OS 105HZ or HZ-R for F3C?
Which is better and is HZ-R approved for F3C?
iyoy
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08-05-2012 02:35 AM  9 years ago
ymuraki

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Tampa, FL

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105!

It's smoother than HZ.
It tops out around 17000rpm on sustained rpm, but it's really strong.
I was using with Hatori 105FS-3C F3C muffler. Very quiet and soothing sound.
Futaba
Kontronik
PRODrone
Morgan Fuel
Peak Aircraft
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08-05-2012 09:48 AM  9 years ago
iyoy

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Bacolod City, Philippines

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Thanks for the quick reply ymuryaki what I meant was which of the two 105s is better for F3C, HZ or HZR?iyoy
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08-05-2012 01:56 PM  9 years ago
ymuraki

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Tampa, FL

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HZ-R.
I haven't tried non-pump version, but -R works really well.
Futaba
Kontronik
PRODrone
Morgan Fuel
Peak Aircraft
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08-14-2012 12:08 AM  9 years ago
slickporsche

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American/Philippines

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OS 105HZ or HZ-R for F3C
I would put my money on a pumped engine anyday,if they are setup correctly, However you are talking a regulated engine, not pumped, much like the awsome YS engines. I would go for the HZ-R.The HZ-R would tend to run the same from full tank, and no matter the attitude of the heli. It also would give a very consistant run from full tank to empty without the usual leaning, which means you can lean it more with full tank, and not worry so much about it going lean at the end. More Power.

I'm not sure there would be an advantage to the 105 for F3-C. Unless you think you need more power for the non hovering manuvers. The 105 was design mostly for the 3-D guys that want to smack the heck out of their helis and need all the power they can get. Thats my two cents.
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08-14-2012 04:46 AM  9 years ago
jpn

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Cebu, Philippines

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???test pilot - Lil's Hobby Center (Hirobo & Futaba Philippine distributor)
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08-14-2012 01:44 PM  9 years ago
BrianSkilton

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Surrey

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I thought you were limited to a.91 in F3C?
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08-14-2012 01:48 PM  9 years ago
krcnz

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Tauranga - New Zealand

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Not anymore - 2012 update removed that limitation
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08-19-2012 07:44 AM  9 years ago
iyoy

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Bacolod City, Philippines

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Well actually yes, you do need much more power for the new aero schedule. Thats why electrics now have the upper hand and thats why the engine size limit has been increased to 1.20 or 20cciyoy
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08-19-2012 09:11 AM  9 years ago
krcnz

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Tauranga - New Zealand

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and thats why the engine size limit has been increased to 1.20 or 20cc
The size limit is not 1.20 or 20cc - it is open

From the Schedule:
Motor: Internal combustion engine displacement: no restrictions
Take a look at the rest of it: goto http://www.fai.org/fai-documents - then open Sporting Code section 4 - about 7 down is helicopter

And for the record, the 91's will do the current schedules just fine
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