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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › os 36 engines vs. tt 39 engine
01-14-2013 02:17 AM  7 years ago
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bricktop

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os 36 engines vs. tt 39 engine
which has the power to climb out of trouble? either or neither?
I didn't say you did it...I said I was blaming you.
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01-14-2013 03:13 AM  7 years ago
LiveToDrive76

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Fort Meade, SD

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Not familiar with 36, do you mean 37? If so, you will be hard pressed to find someone who prefers the tt over the os. Os seems to be a lot more consistent and easier to tune. I've had just about every manufacturer out there and I always have the easiest time with the os motors.

Erik
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01-14-2013 03:24 AM  7 years ago
BONO1

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AR

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Go with the 39. It's a ringed engine and has more power over the 36.

Sam
blow smoke
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01-14-2013 03:27 AM  7 years ago
dkshema

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Cedar Rapids, IA

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OS doesn't make a 36. They do make an OS 37SZ-H, however.
which has the power to climb out of trouble
There is no answer to this question as the definition of "trouble" is far too broad.

Most 30 sized helis already require careful attention to the application of collective pitch, perhaps with the exception of the new Gaui NX4, which looks to be a little powerhouse, and is not really comparable to the current batch of 30-sized helis on the market.

The TT 39 has a spotty record, it's been known to provide good power, but it's also been known to be a real pain in the a$$ to get to run correctly.

Another engine you failed to mention was the Toki 40, which will fit the same mounts, but again, this engine has a real spotty record, as well.

If you want to tinker instead of fly, buy the TT or the Toki. If you wish to fly,however, go OS.
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Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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01-14-2013 04:41 AM  7 years ago
bricktop

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yes...i mean 37, sorry. ok...well, i guess i'll just try and find an OS. never messed with a TT engine. ive always had OSI didn't say you did it...I said I was blaming you.
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01-14-2013 05:42 AM  7 years ago
ShuRugal

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Killeen, TX

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if you don't mind the tuning, the tt39 is capable of the same power as the os37 and uses a bit less fuel to do it (fly with a guy who has a .37 in his rappy 30, i've the .39 in mine. i fly harder and get longer flights for the same tank compared to his machine)

that said, the tt-39 can be a right bear to tune, and during the break-in period barely makes enough power to hover. i've found that using 30% instead of 15% really brings this engine to life, and greatly eases tuning concerns.

on my raptor, i also recently swapped from the r30 pinion to the r50 pinion because the tt engine makes its power at a lower rpm than the os engine does. i had noticed that with my previous setup, i was having to over-rev the engine to get the cyclic/collective response i needed, but then had to deal with engine slowing down to peak power speed. with an extra tooth on the pinion, the rotor is now turning just under 1900 when engine is making peak power, instead of just under 1700.
AMA 700159
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01-14-2013 08:03 PM  7 years ago
MartyH

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USA

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The OS 37 is probably the single best helicopter engine OS has ever made.....period! Maybe the TT39 can make similar power if you stand on one foot, pat your tummy, touch the needle just right and the tuning gods smile upon you. A drunk sailor with no R/C heli experience could tune an OS37. They are that good. Why, I remember when sliced bread came out......

OS did make a 36 by the way. It was private branded for Hirobo.
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01-15-2013 01:30 AM  7 years ago
dkshema

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Cedar Rapids, IA

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Go with the 39. It's a ringed engine
The OS 37 SZ-H is also a ringed engine.
and has more power over the 36.
TT 39 Pro H listed at 1.3 BHP at 16,000 RPM with a usable range of 2,000 to 17,000 RPM.

OS 37SZ-H is listed at 1.38 HP at 18,000 RPM, with a usable range of 2,000 to 21,0000 RPM.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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01-15-2013 04:48 AM  7 years ago
IYKIST

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London united kingdom

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OS did make a .36 plane engine also .
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01-15-2013 05:36 AM  7 years ago
dkshema

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Cedar Rapids, IA

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I don't think OS ever built any kind of 36 sized motor, even going way way back to my control line days in the 1970s. My brothers and I had a Ringmaster with an OS 35 in it.

Looking at the OS web site through Tower Hobbies, and going through the manuals and part listings for discontinued motors, there are no 36 engines listed in car, boat, plane, or heli.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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01-15-2013 05:53 AM  7 years ago
dell17999

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Shanghai,China

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I got both, TT39 on raptor, OS37 on Raven.TT39 is only 90% power of OS37 , OS37 runs smoother and powerful,easier to setup.
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01-15-2013 05:15 PM  7 years ago
MartyH

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USA

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I can't confirm the OS.36 airplane engine but I have seen the .36 heli engine they private branded for Hirobo. If it didn't say Hirobo and 36 on it you'd swear it was an OS 37.
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