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01-10-2010 03:11 AM  8 years agoPost 1
Carey Shurley

rrElite Veteran

Orlando, FL - USA

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so whats the scoop on this motor. according to the specs it is stroked and ported. In one of the photos the intials F.M.M. on the motor appear but no idea if that means anything.

Says its a 27 and includes a dyno run chart, showing very sharp power curves that peak in RPM ranges that are pretty high (I'd have thought flatter curves would have been preferable)

here's the link: http://www.quickheli.com/Zenoah.html

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01-10-2010 03:16 AM  8 years agoPost 2
turboomni

rrProfessor

East of the Equator

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Who makes this motor for QWW?

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

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01-10-2010 03:19 AM  8 years agoPost 3
rbort

rrProfessor

Franklin, MA - USA

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QWW
Irwin at QWW told me he's testing his new 27cc motor a couple of months back. Not sure what the scoop is as I haven't heard any feedback from him or anyone else about it.

-=>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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01-10-2010 03:19 AM  8 years agoPost 4
Carey Shurley

rrElite Veteran

Orlando, FL - USA

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dunno, but this must be the year for gasoline motors, there seem to be 7 or 8 motors now available in various sizes from multiple tuners.

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01-10-2010 03:28 AM  8 years agoPost 5
turboomni

rrProfessor

East of the Equator

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Irwin at QWW told me he's testing his new 27cc motor a couple of months back[quote]

So Irwin doesn't make the motors then? If not who??

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

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01-10-2010 03:34 AM  8 years agoPost 6
rbort

rrProfessor

Franklin, MA - USA

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No
I believe its "his" motor, made for him according to his specs.

At least that's what he said to me.

-=>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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01-10-2010 03:36 AM  8 years agoPost 7
turboomni

rrProfessor

East of the Equator

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How does the dyno chart of this new motor compare to a stock or modified 26cc?

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

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01-10-2010 03:47 AM  8 years agoPost 8
Carey Shurley

rrElite Veteran

Orlando, FL - USA

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just go to zenoah.net, they post dyno results for at least the hobby motors.

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01-10-2010 04:57 AM  8 years agoPost 9
turboomni

rrProfessor

East of the Equator

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OK THX

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

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01-10-2010 07:00 AM  8 years agoPost 10
brw0513

rrApprentice

Brisbane, Australia

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I see from the (linked) table that max. HP and max. torque occur at the same speed of 14650rpm.

Is it normal for the max HP and max torque to co-incide like this?

Would that be the best speed to run this motor then?

Ian B

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01-10-2010 07:11 AM  8 years agoPost 11
Excalibur

rrKey Veteran

Destination: Earth

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I see from the (linked) table that max. HP and max. torque occur at the same speed of 14650rpm.
YIKES! Are you sure you read that correctly? That sounds WAY too high for a 26CC engine, unless it's been specially modified for marine racing.

There's no way in hell I'd run a 26cc heli engine that fast, you're just asking for trouble. Something doesn't sound right. . .

Xcal

Camper Fuel: It's Not Just for Breakfast Anymore

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01-10-2010 08:24 AM  8 years agoPost 12
shawmcky

rrElite Veteran

Isle of Wight,United Kingdom

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Built one of these
To exact same spec,27.5cc stuffed full circle 2mm stroked crank,ported,balanced,lightweight special piston ect ect almost a year ago using readily obtainable parts from various tuners.Even a lightened/balanced flywheel.If you look at the cylinder it has to be relieved to accomodate the extra stroke as a thicker base gasket exposes the piston ring location pin/ring ends at bottom dead centre.Cylinder is much modded(ported)as the pic shows.The red parts of the crank are the "stuffed" part of the radius to make the crank full circle and the crankcase has to be relieved to accept the modded crank as well.

Team- unbiased opinion.K.I.S.S principle upheld here

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01-10-2010 08:47 AM  8 years agoPost 13
shawmcky

rrElite Veteran

Isle of Wight,United Kingdom

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A powerfull engine no doubt
you need a very good airframe and components to keep up with it,anyone got one? QWW graph is showing 4.81 B.H.P at 13,300 R.P.M with a stock muffler.Still a lot of power.Tuned pipes for the most part tend to let the power punch in like a hammer blow which can be hard on the mechanics especially when a lot of B.H.P is involved although that graph looks amazingly progressive.

Team- unbiased opinion.K.I.S.S principle upheld here

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01-10-2010 10:34 AM  8 years agoPost 14
brw0513

rrApprentice

Brisbane, Australia

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YIKES! Are you sure you read that correctly?
What else would 14650 mean?

Ian B

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01-10-2010 11:56 AM  8 years agoPost 15
Carey Shurley

rrElite Veteran

Orlando, FL - USA

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the chart is a little misleading, when I first looked at it I thought it was HP and torque, but its not. Its HP with a tuned pipe vs HP with the std can muffler

either way the power is very peakish. If you look around 13K rpms the power is ramping pretty steeply on either setup.

maybe the Quick models have very high gearing.

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01-10-2010 12:50 PM  8 years agoPost 16
duke666

rrKey Veteran

Hampshire, UK

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"stuffed"
As a relative newby to gassers, could some one explain to me what a "stuffed" crank is and what it achieves please?

Duke

OOOPPS............

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01-10-2010 01:48 PM  8 years agoPost 17
GMPheli

rrElite Veteran

W. Bridgewater, MA USA

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"stuffing" applies to all 2 strokes and what is done is as much volume as possible in the lower end is filled or "stuffed". This reduces the volume of the lower end which raises the pressure that is built there when the piston comes down. This higher pressure results in more charge being pushed thru the transfer and boost port. In this case it looks like plastic has been added to the crank to make it a complete circle. The plastic is relatively light compared to the steel of the crank so it will not effect balance that much.

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01-10-2010 02:22 PM  8 years agoPost 18
duke666

rrKey Veteran

Hampshire, UK

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Thanks for the explanation GMPheli, makes perfect sense now.

Duke

OOOPPS............

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01-10-2010 03:53 PM  8 years agoPost 19
AceBird

rrElite Veteran

Utica, NY USA

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Is it normal for the max HP and max torque to co-incide like this?
It happens at a point when the torque decreases rapidly while the speed increases. You do not want to be operating at this speed. You want the run speed to be where the torque will increase appreciable if the RPM dips a little, otherwise the engine dogs on a power climb. A horsepower curve is misleading. Zenoah's curves are plots of speed and torque much more meaningful for our purposes. Horsepower curves are marketing hype.

Ace
What could be more fun?

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01-11-2010 04:20 AM  8 years agoPost 20
turboomni

rrProfessor

East of the Equator

My Posts: All  Forum  Topic

Shawmcky
Built one of these
To exact same spec,27.5cc stuffed full circle 2mm stroked crank,ported,balanced,lightweight special piston ect ect almost a year ago using readily obtainable parts from various tuners.Even a lightened/balanced flywheel
What were your findings with this motor setup? Was it smooth .,powerfull ,,user friendly??? What heli was it in??
Sorry if your results were somewhere here earlier as I didnt see it.

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

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