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HomeAircraftHelicopterGasser Model RC HelicoptersEngines › OS15 gasser heli
06-12-2013 07:21 PM  5 years agoPost 21
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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Hirobo currently sells a purpose made kit:
- FREYA Evolution OP SWM SSZ-V for GT15HZ

what the heck is Hirobo I mean one the main stream manufactures. Align, Min air, Thunder tiger. you know the ones we can get parts for. Not some overpriced fc3 model.

OS wants a lot of coin to become beta testers, for now the traditional gassers are just fine

spending time, paying attention

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06-12-2013 08:35 PM  5 years agoPost 22
Gearhead

rrMaster

Vt

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you know OS could build this engine like any small Zenoah with no Cylinder Liner and it would probably be a cooler running engine, it could have more displacement too, and would be cheaper to produce

Jim
Buzz Buzz Buzz

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06-12-2013 09:31 PM  5 years agoPost 23
RM3

rrElite Veteran

Killeen, Texas - USA

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Zenoah with no Cylinder Liner
I would guess this is the reason for the engine seizures/failures they are having and the piston breaking apart, piston ring trapping...etc...

maybe they forgot that gasoline engines run way hotter???....and as such the piston (made from aluminum) expands alot more than the steel liner...so it locks up in there at high temps, so to compensate they gave it a bit more piston to cylinder clearance (slop) and that in itself causes the piston ring to jump the pin and spin until it finds a nice port to gouge into???
and would be cheaper to produce
yeah but now you have an issue with taking the engine apart yes? don't you have to remove the liner First in order to take the pison/conrod out, now that they don't have that hole in the case to pull the pison wrist pin out?
what the heck is Hirobo
LOL, no S%&T! an ex hero thats now a hobo?

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

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06-12-2013 10:14 PM  5 years agoPost 24
Pirofreak

rrNovice

St Louis

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After two blown piston, they are sitting on the book shelf.
I really do not have much of nice things to say about this engine. I have been avid OS nitro engine user for over 30yrs. And I love all my OS nitro engines. (Except the early os 90 engine models that had problems with high compression and frequent overheating problems)
I jumped on the GT15 hZ when it came out. It was breaking in nicely, when all of sudden piston blew out. Figured I got the lemon and got another one and again, about a gallon into it it blew. I have 3 Gasser helicopters with TRM 270 TT in it. I am not a gasser newbie. I also understand OS has been warning user of not leaning needles more than 30 degrees from initial recommended settings. Having heeded all those guide line and it still put a hole through the piston twice. I am through with this engine and I would not recommend this engine to anybody.
But I am a OS engine sucker and probably try it again when updated version of this engine comes out.

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06-12-2013 11:26 PM  5 years agoPost 25
RM3

rrElite Veteran

Killeen, Texas - USA

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..any reps care to respond to that?

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

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06-12-2013 11:42 PM  5 years agoPost 26
Ravenhyper50

rrKey Veteran

Canada's Capital

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I'm not a rep of any sorts.

What type of gas, octane and what kind of oil was used and with what oil to gas ratio??

Not just tuning but the above mentioned play a big part on how well or not so well your gas engine would perform or fail.

What works well for the bigger gas engines might not be good for this tiny 15cc? Just a thought

Raven

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06-13-2013 12:54 AM  5 years agoPost 27
Carey Shurley

rrElite Veteran

Orlando, FL - USA

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the motor is what it is........

its a 15cc gasoline motor that can be installed into most existing 700 class nitro helicopters with minimum modifications so for folks that want to try gas power but not commit to buying a complete gas helicopter, its an option.

its not tolerant of overheating whether from lean mixtures or poor cooling or overloading.

it makes less power than a .91 glow motor largely due to the difference in the fuel. This can't be overcome regardless of tuning.

once you know how it behaves when its hot and you avoid that, it doesn't fail. Telemetry really helps with this. You have to adapt to the available power. With all of the power available in the electrics I think this is a real challenge for most folks.

Regardless to my knowledge, its the first motor of its sort that actually worked in a helicopter to this level of success with any level of consistency. Of course lots of them work in airplanes.

Although if you gear a 700 properly its better than most of the posted videos I think its real value is going to be in smaller models, 600ish.

Proprietor - Gas Powered Helicopters

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06-13-2013 04:08 AM  5 years agoPost 28
Crazy Horse

rrApprentice

Orlando FL

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oil
if would of used amsoil it would still be going strong (6)

sponsored by generous people that give tips to thier limo driver

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06-13-2013 01:18 PM  5 years agoPost 29
Rototerrier

rrVeteran

Fayetteville, GA - USA

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if would of used amsoil it would still be going strong
Oh man, didn't realize it was already time to stir the pot.

I really don't think these engines should be so sensitive that you can't just go out to any local filling station and get "any" grade of pump gas and mix it with any bottle of 2 cycle oil at the recommended ratio.

It really should just be that easy.

Wonder if any of the engine modifiers have messed with these engines and have any input on them (hint Carey). Wouldn't mind knowing a professional's opinion on them...just for the sake of discussion. I'm sure they would be hesitant to come forward directly with such information for fear of looking like they are trying to sway public opinion to their favor, which wouldn't be too hard given the number of negative posts. But indirectly, maybe there could be some information shared.

Gassers Rule, Nitros Drool, Electrics...uhhh...Joule?

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06-13-2013 07:58 PM  5 years agoPost 30
RM3

rrElite Veteran

Killeen, Texas - USA

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Value? what value?, at nearly $500 for an engine that destroys itself if you so much as look at it sideways? then have to buy yet another? Then add a telemetry system so that this "hanger drama queen" can text you like a 15 year old girl on Red Bull just before it has a B!T@H fit?

wonder how many of these are gonna end up in the garbage come late August when temps soar over 100 degrees.

...well If we add liquid cooling and a lipo powered fan with a themostat....

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

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06-13-2013 08:02 PM  5 years agoPost 31
ICUR1-2

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Ottawa, Ontario

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just get some dry ice to put on top of the head and replace/refuel the ice every flight

may as well get a boat engine if you want water cooling

spending time, paying attention

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06-13-2013 08:14 PM  5 years agoPost 32
Carey Shurley

rrElite Veteran

Orlando, FL - USA

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wonder how many of these are gonna end up in the garbage come late August when temps soar over 100 degrees
can't answer that........but I have run it in 100+ degree ambient temps here in Florida last year and it was fine.

Proprietor - Gas Powered Helicopters

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06-13-2013 08:19 PM  5 years agoPost 33
Azalin

rrApprentice

Ankara-Turkey

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But it's you Carey. From what I have seen most of the GT-15 owners are new to gassers, moving from nitro. They are not as good as you are with gas engine tuning.

Helibug Trex 700 HB7-RC Gasser | TRM VX270TT | V-Bar silver line
Helibug Trex 600 HB6-RC7 Gasser

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06-13-2013 08:23 PM  5 years agoPost 34
Justin Stuart (RIP)

rrMaster

Plano, Texas

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If OS really wanted to succeed with this motor, they should have sold it as a lost-leader and offered no-questions-asked repair/replacement policies to all early adopters until the market was saturated with these motors and the majority of heli manufacturers started to offer factory bolt-on kits to fit the motor. Instead, OS has chosen to blame customers for problems they had with with the motor, and as a result many people are now very wary of the motor. This was a marketing mistake. As a result, I think that very few helicopter manufacturers will take this motor seriously, and even fewer will offer the larger shrouds/fans/mounting brackets needed to fit it, and as a result in a year or two it will fade from existence. At first the nitro pilots (who are the primary market for this motor) said "If I buy this motor, I can save $40 a gallon on nitro fuel in my .90". But now these same pilots are thinking, "for the $500 it will cost me to repair or replace this motor, I could have bought a lot of cases of nitro."

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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06-13-2013 08:25 PM  5 years agoPost 35
rbort

rrProfessor

Franklin, MA - USA

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Also flights
I mean you can run it here and there and all is good, but what happens if you fly it 20, 30, 50 or more flights? If you run it just a few times, its hard to say how well it lasts...

-=>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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06-13-2013 08:37 PM  5 years agoPost 36
Gearhead

rrMaster

Vt

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and in a year or two it will fade from existence
you mean like the Webra 15 and Webra 20 gassers

Jim
Buzz Buzz Buzz

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06-13-2013 09:09 PM  5 years agoPost 37
Carey Shurley

rrElite Veteran

Orlando, FL - USA

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If you run it just a few times, its hard to say how well it lasts...
I doubt they will ever be as durable as an industrial motor like a Zenoah, the glow motors certainly aren't. On the other hand its a lot lighter which is sorta the whole idea here. The original idea was to give folks a way to plug a gas powered motor into their existing 700 helicopter without any significant mods. To that end the major mfgrs didn't have to do anything, you can bolt it right into a Whiplash or a Freya or a Trex or a Vibe. It won't be optimized but then it was targeted for just general sport flying.

Zenoahs aren't indestructable, I can easily ruin one in one flight, its not that hard.

Proprietor - Gas Powered Helicopters

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06-13-2013 09:19 PM  5 years agoPost 38
RM3

rrElite Veteran

Killeen, Texas - USA

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+++
From what I have seen most of the GT-15 owners are new to gassers, moving from nitro. They are not as good as you are with gas engine tuning.
I'll add that most guys are more likely to fly thier helis under the idea that its setup "good enough" rather than sit there on the bench and methodically go back and forth until everything is just right all day. So yeah, I agree, get some newbie or even your typical "its good enough" dude to mess with this thing and its likely to end poorly.

...fade from existance would be nice, its quiet and uneventful...this thing is going out with a bang in some cases.

I say cut the price in half...I mean dang, this reminds me of those expensive hobby rocket motors...$30 ea...pifffffttttt!!!!, oooohhh, ahhhh, well... there went $30. lets do it again daddy!

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

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06-13-2013 09:23 PM  5 years agoPost 39
turboomni

rrProfessor

East of the Equator

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I don't get 500 bucks for up to half the displacement ,,even if it worked correctly. Someone here pushed "small displacement is the way to go".. maybe they could chime in and tell us the advantages again.

Setup is everything, All my heli's can fly far better than I can pilot them

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06-13-2013 09:54 PM  5 years agoPost 40
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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500$ is roughly 16 individual gallons of fuel at retail, pretty much a full season worth + for me

not worth it for an engine that's not supported

but I do see a gasser in my future

spending time, paying attention

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HomeAircraftHelicopterGasser Model RC HelicoptersEngines › OS15 gasser heli
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