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HelicopterSynergy R/CSynergy N9 › Headspeed for Synergy N9 with OS Engine
03-16-2009 05:05 PM  8 years agoPost 1
Rockohaulic

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Canyon Country, CA,​USA, 3rd Rock from​the Sun

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I heard that the OS/Align 91 engines rev a bit higher than the YS91, and that you can run a higher headspeed. I heard you could run 1900.

So I just read that the Align 91H engine makes 3.4 hp @ 15,000 rpm. This is also posted on the OS website.

The gear ratio on my Synergy N9 is 8.27:1.

15,000/8.27 = 1814.

So shouldn't I be setting my headspeed closer to 1800 rpm???

Thanks guys.

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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03-16-2009 06:19 PM  8 years agoPost 2
Chuckie

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Crofton Maryland

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Yea but usually the torque curve extends beyond the HP curve before coming down. At 1900 you might be beyond the HP peak point but still on the high part of the torque curve. I thought 1900 to 1950 was ok for the OS.

Please stand by for faster service!

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03-16-2009 06:20 PM  8 years agoPost 3
cdrking

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Seattle

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I run 1950 on my OS powered N9, works very good.

Jeff

To hover is divine, the alternative is rather PLANE.

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03-16-2009 07:14 PM  8 years agoPost 4
Rockohaulic

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Canyon Country, CA,​USA, 3rd Rock from​the Sun

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Thanks guys.

What is everyone else running?

Along those lines, what are owners of YS91 SR engines running for headspeed?

Does anyone know the specs for hp output and rpm for the YS91 SR engine???

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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03-16-2009 09:09 PM  8 years agoPost 5
baddynergy

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sierra madre, ca-​usa

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Along those lines, what are owners of YS91 SR engines running for headspeed?
1850 with stock gearing on the YS is about max. 1950 for the Os-sz.
1950 with the 16 tooth pinion with the Ys.

**Unattended children will be givin a shot of espresso and a puppy**

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03-16-2009 09:33 PM  8 years agoPost 6
Chuckie

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Crofton Maryland

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Yup 1950 with 16 T pinion.

Please stand by for faster service!

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03-16-2009 10:08 PM  8 years agoPost 7
Rockohaulic

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Canyon Country, CA,​USA, 3rd Rock from​the Sun

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I got this info on the YS engines...

YS 91 SR Engine
SPECIFICATIONS
YS Stock Number: 91SR
Displacement: 0.908 cu in (14.88cc)
Bore: 1.06 in (27.0mm)
Stroke: 1.02 in (26.0mm)
Practical rpm: 2,000-16,000
Output: 3.2 hp @ 14,600 rpm
Weight w/o muffler: 18.8 oz (533 g)
Check it out at:

http://www.diamondheli.com/Engines&Exhausts.html

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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03-16-2009 10:20 PM  8 years agoPost 8
baddynergy

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sierra madre, ca-​usa

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Practical rpm: 2,000-16,000
I wonder if they dynoed the engine because YS says the engine is good to 17000rpm. And gives no specs as far as power output.

**Unattended children will be givin a shot of espresso and a puppy**

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03-16-2009 11:03 PM  8 years agoPost 9
baddynergy

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sierra madre, ca-​usa

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SPECIFICATIONS:
Stock Number: OSMG1975
Displacement: 0.912 cu in (14.95 cc)
Bore: 1.091 in (27.7 mm)
Stroke: 0.976 in (24.8 mm)
Weight: 21.8 oz (618 g)
Practical RPM Range: 2,000-16,000
Output: 3.4 hp @ 15,000 rpm
Includes: 61B carburetor, muffler, in-flight needle valve adjustment arm & #8 glow plug
Specs from OS for the HZ engine. You may want to consider the 16tooth pinion for the 1950 headspeed or run around 1800 with stock gearing.

**Unattended children will be givin a shot of espresso and a puppy**

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03-17-2009 05:55 AM  8 years agoPost 10
DEFILER

rrApprentice

Houston - USA, Balad​- IRAQ, Kuwait - KWI

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I run 1925 with YS91SR Hatori SB-19 and 16t pinion.

It seems to sing with this config...

I only crash due to random planetary intervention

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03-17-2009 09:44 AM  8 years agoPost 11
ch-47c

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san jose, ca

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1850 YS91 SR stock gearing. I asked Todd B. last year about the rpm and he said 1850.

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03-17-2009 02:50 PM  8 years agoPost 12
Kevin Dalrymple

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Indianapolis

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1950 on my OS SZ and HZ both work great there. The problem with running 1850 or around there is if you load the head the motor has a hard time getting back to 1850. What i am saying is it just falls out of the power band and you need to hover the heli to get the head speed back. 1850 is ok if you are not doing and big moves or smack, but that is boring. I will admit that i am not the best on collective managemant, but you will be fine with 1950.

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03-17-2009 03:04 PM  8 years agoPost 13
wings19

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Tucson, AZ

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I am running the OS .91 HZ engine and I've tried anywhere from 1800 to 1900 and it really seems to be happy at 1900.

I am running stock gearing, 8.27.

Nick
If the wings are traveling faster than the fuselage, it's probably a helicopter

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03-17-2009 03:46 PM  8 years agoPost 14
baddynergy

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sierra madre, ca-​usa

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The reason is some have had good luck running the motor at 15,700 and above while others have not. 15,300 to 15,500 is the best speed if you want the motor to last the longest. Do the math and decide for yourself.

With stock 15 tooth pinion and 8.26 gear

15,300/8.266 = 1850
15,500/8.266 = 1875

With 16 tooth pinion you get 7.75 gear ratio

15,000/7/75 = 1935
15,300/7.75 = 1974
Another one of Chuckies great info posts.^^^

At 1900 with the OS-HZ and stock gearing puts you at the very peak of OS specs for the engine. I wouldn't think it will last long at those speeds. Maybe OS has the specs wrong or we see how long these new and improved OS's last at higher head-speeds. IMHO I would opt for the 16t pinion and run 1950. Remember OS spec the engine at 3.4hp@1500, so I would think 1850 with stock gearing would be max.

**Unattended children will be givin a shot of espresso and a puppy**

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03-17-2009 04:35 PM  8 years agoPost 15
cdrking

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Seattle

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I haven't read or heard of many people running the OS HZ with a 16t pinion. I'm liking mine at 1950.

Jeff

To hover is divine, the alternative is rather PLANE.

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03-17-2009 04:54 PM  8 years agoPost 16
Chuckie

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Crofton Maryland

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No they haven't dynoed the motors!!!

That site has the same hp for YS ST and SR motor. What a bunch of BS. That's not true from what I've seen and experienced and I've flown both for years.

Edit: And the max rpms are out of whack. The ST could run higher than the SR.

Edit: And don't get me started on which manufacture has more hp!

Charles

Please stand by for faster service!

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03-19-2009 09:08 PM  8 years agoPost 17
ofir

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tel aviv - israel

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mine is 2100. (radix 710SB) and it's a killer.

My name is Ofir and I am a helicopters addict...

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03-19-2009 09:26 PM  8 years agoPost 18
Rockohaulic

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Canyon Country, CA,​USA, 3rd Rock from​the Sun

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2100 on a 90!

Holy cow!

I don't want to be there when something let's go................

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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03-19-2009 10:54 PM  8 years agoPost 19
baddynergy

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sierra madre, ca-​usa

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mine is 2100. (radix 710SB) and it's a killer.
Not yet, but its going to be when it comes apart.. (safety glasses on)

**Unattended children will be givin a shot of espresso and a puppy**

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03-19-2009 11:04 PM  8 years agoPost 20
Rockohaulic

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Canyon Country, CA,​USA, 3rd Rock from​the Sun

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Not yet, but its going to be when it comes apart.. (safety glasses on)
Your not kidding - I'm thinking safety glasses, a cup, a kevlar vest, and a helmet...

That thing is going to grenade!

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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