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01-20-2018 07:32 PM  8 months agoPost 1
cjimflying

rrNovice

Paynesville Mn. USA

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I am thinking about putting a gas engine in a trex 700 a Os 15 HZ gas is this a good or bad decission

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01-20-2018 09:23 PM  8 months agoPost 2
banshee rider

rrApprentice

Phoenix AZ.

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Very Bad
They are junk and dont have much power
the wrist pin fails and destroys the engine
most of the motors run hot unless you buy a after market head
causing the motor to fail also

there just poorly designed

ageing is manditory maturity is optional

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01-20-2018 09:59 PM  8 months agoPost 3
rbort

rrProfessor

Franklin, MA - USA

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With or without all the mods you can get for it, it will still fail.

-=>Raja.

MA 1005 Hanson 280, 4220 flts
Spectra 27 3DMax, 3310 flts
Whiplash V1-2 Hanson 300, 1618 flts
Whiplash V2 Hanson 300, 473 flts

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01-20-2018 10:44 PM  8 months agoPost 4
dschertz

rrApprentice

Jackson, MI

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Don't do it. Went through two of them. Not worth it.

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01-21-2018 03:15 PM  8 months agoPost 5
wjvail

rrKey Veteran

Meridian, Mississippi

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I was following this thread to see what answers you got. I'm always looking for something new and interesting to try.

I think I'll back burner this idea. There seems to be a clear consensus on this one.

I find it interesting the wrist pin fails. I own hundreds of engines and have been running glow motors for more than 50 years. Many of them have failed in many different ways - but I have never hurt a wrist pin. Front bearing and wrist pin have been 100% reliable for me.

"Well, Nothing bad can happen now."

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01-21-2018 08:53 PM  8 months agoPost 6
Carey Shurley

rrElite Veteran

Orlando, FL - USA

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I'm not aware that the "wrist pin" has ever failed. The pin clips could come out but thats why we added the spiral pin clips, they don't come out

Proprietor - Gas Powered Helicopters

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01-21-2018 09:07 PM  8 months agoPost 7
PaulBowen

rrKey Veteran

Victoria, Australia.

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I’m sure it also depends on the intended flying style.

Futaba T18SZ, JR Propo XG14, Hirobo fanatic!

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01-22-2018 02:41 PM  8 months agoPost 8
RM3

rrElite Veteran

Killeen, Texas - USA

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the biggest problem with this engine is what the user is "used" to flying vs what the engine is capable of...

the little 15 is very particular to what it can tolerate and what it cant... there is very little middle ground.

where as a Zenoah RC engine can indicate a lean or rich condition and allow you enough wiggle room to learn to tune it, can get too hot, vibrate too much or over speed and still survive most of the time... the OS 15 does not tolerate such ignorance. the other problem is power... I think most trying the 15 are used to getting more power from a .50 and expect it to get at least that much (not as much as a .90), when its closer to a 30... so they tune and fly with what they know and this results in an engine eating itself on a routine basis... its not uncommon to see videos of a 600 running a 15cc and constantly hear engine bogging...

I consider the 15 an expert tuners engine... and not one for those "experimenting"... its just not there yet.

showing a preference will only get you into trouble, 90% of everything is crap...

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01-23-2018 02:45 AM  8 months agoPost 9
Dawiev

rrApprentice

Middle East

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I certainly would not class myself as an expert tuner (and most likely ignorant - ouch). Did all the mods - WAR head, spiral retainers, heatsink, both HZ and GT carbs.

Telemetry for temp, never went over 13,500 RPM. Used for sport flying and orientation practice. Couldn't get it to stay together for longer than a few months at a time.

Compared to my Zenoah and the T10, which behaves as gassers should (starts, runs - fun) it was indeed too fragile for me.

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01-23-2018 05:44 AM  8 months agoPost 10
rbort

rrProfessor

Franklin, MA - USA

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OS15 RC boat anchor
Has anyone ever successfully used this engine habitually? I mean I'm not talking about a few test flights here and there, or the occassional flight on the weekends, but has anyone flown this engine week in and week out with no issues? Most people report failure within 5 gallons and I'll go out on a limb and say that no-one has ever succeeded in doing that for over 10 gallons worth of fuel. Unfortunately many Many people have seized this motor even with all the upgrades possible. Its a little 15 motor with bushings trying to do the work of a bigger one with roller bearings on the connecting rod...

I for one have flown a Zenoah engine for over 1300 flights or 3+ years in service with NO maintenance whatsoever. Think about that for a minute. That's over 160 gallons of fuel through the engine without having to service it, even change bearings or a ring. I understand the difference in size for motors and that the OS 15 can fit in several applications the Zenoah might not be able to unless you get a conversion kit for it, but still, one engine is alot of headache and the other one is practically maintenance free as I've demonstrated.

Your mileage with the OS 15 engine will not vary by much from others who tried before you...

-=>Raja.

MA 1005 Hanson 280, 4220 flts
Spectra 27 3DMax, 3310 flts
Whiplash V1-2 Hanson 300, 1618 flts
Whiplash V2 Hanson 300, 473 flts

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01-23-2018 10:00 AM  8 months agoPost 11
dschertz

rrApprentice

Jackson, MI

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I flew mine in the Freya with a 1500rpm head speed and never once did a flip, roll, or anything. Had a gov on it day one and neither of the two lasted over a gallon. Using their recommended needle settings.

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01-23-2018 02:12 PM  8 months agoPost 12
RM3

rrElite Veteran

Killeen, Texas - USA

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and yet with all this evidence, very high risk low reward.... this little engine persists.

showing a preference will only get you into trouble, 90% of everything is crap...

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01-23-2018 02:28 PM  8 months agoPost 13
Dawiev

rrApprentice

Middle East

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Stocks will last forever, if it doesn't sell ?

All posts I've seen are from past experience. I've not seen anybody post that it is flying and staying together.

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01-23-2018 07:28 PM  8 months agoPost 14
Rojoalfa

rrVeteran

Punta de Mata, Monagas-Venezuela

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/
/

Nice piece of junk!

Carb adjustments are nightmare...

Miss piggy doing ballet..

/

Saludos cordiales,

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01-23-2018 07:54 PM  8 months agoPost 15
wjvail

rrKey Veteran

Meridian, Mississippi

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RM3
and yet with all this evidence, very high risk low reward.... this little engine persists.
At one point in time I questioned the decision to stop importing the OS .37. I would argue it is one of the best engines the helicopter community ever had. I would further suggest this hobby needs a good 30 helicopter.

I was told the 37 was discontinued as a business decision. The sales of 30 class engine didn't merit their continued import. I always found that excuse questionable. How many 15HZ does HobbyCo sell? How many $3,500 7 cylinder Sirius radials does OS sell? The OS .37 was the show stopper? That was the problem on the balance sheet?


https://www.towerhobbies.com/cgi-bi...p?&I=LXZVB2&P=0

"Well, Nothing bad can happen now."

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01-23-2018 10:21 PM  8 months agoPost 16
dschertz

rrApprentice

Jackson, MI

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The .37 is still available if ordered from Japan.

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01-24-2018 01:54 AM  8 months agoPost 17
Carey Shurley

rrElite Veteran

Orlando, FL - USA

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we have a number of customers with many flights on the modified engine.

I don't think most people track the amount of fuel they use or even count the number of flights they make so there's no way I can determine how many, if any have burned more than or less than 10 gallons of fuel. On our Goblin 570 gas conversion that would be about 250 typical flights.

Since not everybody flies thousands of flights per year I'm not even sure how long it would take a typical pilot to fly that much fuel.

I would agree that an out of the box stock GT15 is not suitable for ANY helicopter use which is why we developed a number of unique modifications AND running configuration for the engine. We also recommend running SIGNIFICANTLY more oil than is typical for a gas helicopter engine which addresses both internal heat and lubrication for non-bearing surfaces.

As was pointed out earlier, the engine was originally sold as a replacement for a .90 size glow engine on 700 class helicopters. It is not well suited for that purpose as it doesn't make enough torque for that application and can be easily overloaded and overheated which is why we targeted it for the Goblin 570 conversion. Its a good fit for the smaller configurations.

It is also NOT an engine for beginners. Zenoahs are at their heart industrial engines and are tolerant of poor fuel, oil and tuning. Like most glow engines, the GT15 is NOT tolerant of incorrect tuning so IC engine tuning is helpful

Proprietor - Gas Powered Helicopters

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