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HomeAircraftHelicopterHIROBOHirobo Freya › OS GY15HZ II
05-12-2018 09:42 PM  3 months agoPost 1
giorgio

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Doral, Florida

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Hi,
After reviewing various threads on the tuning and breakdowns of the OS GT15HZ, I found out on the OS Japan website, they launched a new OS GT15HZ II heli gas engine. Has anyone of you heard of it?. Im working on my Freya Evo 90 and already got the frame for the GT15 engine. I trust OS and I really want to give it a try to this engine. I plan to fly strictly scale. Your comments will be apreciated.

Christian Sanchez

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05-12-2018 10:08 PM  3 months agoPost 2
dkm

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sydney, Australia

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After having blown 3 gt15's, I will wait until the new model is well proven.
Once bitten, twice shy.

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05-13-2018 05:13 AM  3 months agoPost 3
giorgio

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Doral, Florida

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Christian Sanchez

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05-13-2018 11:48 AM  3 months agoPost 4
dschertz

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Jackson, MI

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I went through two of those engines in my freya just doing simple forward flight with a 1500rpm head speed..... it would be nice to believe the new one is better, but I wouldn't hold my breath. I love the idea though.

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05-13-2018 02:03 PM  3 months agoPost 5
wjvail

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Meridian, Mississippi

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I suppose the questions are, what was failing, what is "new" about the new engine, and do these two questions overlap. I have this picture of a venn diagram in my head.

If the connecting rod was failing and OS put on a new backplate on the engine, I wouldn't expect a lot. The circles don't intersect. If, on the other hand, the ring/piston were burning up on the old engine, and the new engine includes a redesigned piston, it could be worth a second look.

"Well, Nothing bad can happen now."

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05-16-2018 02:38 PM  3 months agoPost 6
giorgio

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Doral, Florida

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I received an email from OS customer support in Japan and I was told the Version II engine would be available in the US in October/September this year. Lets hope for the good the issues are fixed.

Christian Sanchez

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05-16-2018 06:48 PM  3 months agoPost 7
Mikerobe

rrVeteran

Green Turtle Cay,Abaco, Bahamas.

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I thought about trying this motor some time back but didn't like the reports.
Hopefully the new one is a success and they'll eventually make it available with a recoil starter and integrated ignition system!

The lot I got is not a lot, but I thank God a lot for the lot I got!

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05-16-2018 08:47 PM  3 months agoPost 8
PaulBowen

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Victoria, Australia.

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I would love one in my Freya. I’m not concerned about the power output as it will be adequate for me, it’s the longevity that worries me. It would certainly beat my current $10 flights.

I will need some pretty reliable proof before spending my hard earned.

Futaba T18SZ, JR Propo XG14, Hirobo fanatic!

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05-17-2018 10:29 AM  3 months agoPost 9
dschertz

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Jackson, MI

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After the first version, I'm skeptical. I went through two of them just puttering around in forward flight.

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05-17-2018 07:53 PM  3 months agoPost 10
THX1138

rrElite Veteran

Indianapolis, IN

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I would love for this to be a legit engine. $4 a gallon sounds pretty good to me for sport flying...

Lou

Just give me five dudes and two flashbangs...

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05-22-2018 01:15 PM  86 days agoPost 11
hungryhippos

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Perth, Western Australia - Australia

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I just had a look on the Japanese o.s. engines website, here is a quote post chrome translate.
GT 15 HZ who made a sensational debut as the world's first 700 class helicopter exclusive 15 cc gasoline engine brushed up to the second generation.
Its been "sensational" for a lot of people from what I have seen so far. Clever wording.

I have noticed that the original GT 15 HZ has been taken of their sites.

However, I would say I have been lucky with my O.S. GT15HZ, the only thing that went wrong was the sensor for the timing. That was a simple fix.

Yes this engine is under powered. But I managed to do light 3D that would resemble something of old people trying to do a fart.

These are my pointers for making this engine last.
- Break in and tuning, be very patient and conservative.
- Always run a bit rich in the mixture.
- 95 unleaded fuel (Premium).
- I used a good oil, Castrol Fully Synthetic Motorcycle Racing 2 stroke. (In Western Australia we have limited choice)
- When mixing the fuel and oil, I was pedantic, and always added an extra bit of oil ( a drop or so).
- I did a warm up slow circuit or two at low power before going into idle up 1.

Regardless, its good to see that o.s. engines is still making something, and not dying out completely.

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05-22-2018 06:32 PM  85 days agoPost 12
giorgio

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Doral, Florida

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I just found out as well on the Japanese website:
https://www.rcjapan.net/index.php?m...Path=80_321_324

It seems they have improved the cooling with a new head and also the cover plate on the back of the crankcase has been improved for cooling purposes. Lets just wait for the best. My intention is just regular flying with a scale body and multiblade head. Lets keep the posts to see how we do.

Regards,

Christian Sanchez

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