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-   -   ZENOAH G26 RPM (http://www.rcuniverse.com/forum/gas-engines-142/11204781-zenoah-g26-rpm.html)

aframe2 08-24-2012 01:38 PM

ZENOAH G26 RPM
 
I have a Zenoah G-26, turning a 18x8 Xoar prop. I can't get any more than
6500 rpms. Is this too much prop for this engine? If so what size prop
are you running with this engine? The instructions say the engine should
be turning between 7500-8500 rpms.Thanks Aframe2

tkg 08-24-2012 02:22 PM

RE: ZENOAH G26 RPM
 
The bench mark prop is an APC 16-8 @8900 rpm. You need to get one and see what your engine does. If your engine is close.then you need to resize the Xoar till the engine is in its power band.
IMHO an 18-8 Xoar is way to much prop.

pe reivers 08-25-2012 05:51 AM

RE: ZENOAH G26 RPM
 
18x8 is just right for an MVVS 26 spinning at about 7600 rpm with the standard MVVS tuned pipe. A lot depends on the muffler though, and the engine will only get about 6800 on a side dump muffler.
At 6500 rpm on your engine, which likes to run a bit more rpm than MVVS, the prop may have very decent pull and be just what you need. You can always shorten the prop to 17" diameter as TKG suggested.

aframe2 08-25-2012 08:11 AM

RE: ZENOAH G26 RPM
 
Thanks, I originally had a 16x8 prop and was getting 8500 plus rpms.
My concern was that I have this engine on a Pacific Aeromodel Gee
Bee Y 1/4 scale, and the cowl is huge. There wasn't much prop past the outside
diameter of the cowl, so I changed to a 18x8. Haven't flew the plane
with this prop, was concerned about the power with so much less rpms.
I have a 17x6 prop on order that I will try, if it doesn't give me at least
7500 rpms I will return to the 16x8. Thanks for the advice. Aframe2

capnduane 08-25-2012 01:38 PM

RE: ZENOAH G26 RPM
 
I am running a 18x8 on my Pac aero GBY, but I have a Quadra 35 in it. Flys it great. I have a Zenoah 26I in my 1/4 scale Fokker D8, 17x8 prop does good.

dadragon 08-26-2012 06:27 AM

RE: ZENOAH G26 RPM
 
try dropping down to an 18-6.my G-23 pulls a 1/4 scale cub around just fine on that set up.

pe reivers 08-26-2012 01:30 PM

RE: ZENOAH G26 RPM
 
The 6"props scream their heart out, and just fail to perform as well as higher pitched props, unless you want to fly 3D. Even then the 6" pitch is questionable.

hobby_man 08-29-2012 08:46 AM

RE: ZENOAH G26 RPM
 
I had an xroar 18 x 6 7500 rpm on my g-26 ei
now I have an 17x 8 7600 rpm and more pull and my YAK

has anyone changed out the wt644 carb for a wt813 ? the wt-813 has an accelrator pump feature

Is anyone using these carbes with the primer buld?

hobby_man 09-17-2012 04:55 PM

RE: ZENOAH G26 RPM
 
I had an xroar 18 x 6-7900 rpm on my g-26 ei after so more tuning

dadragon 09-22-2012 08:15 AM

RE: ZENOAH G26 RPM
 
I went to a 16x10 on the G23 and made it pull a little better,I fly at about 5000',I started useing LL100 avgas,nice improvment.temp and humidity plays a big factor for me,the plane is 16LBS,I think I found the rite combination.I tried the 18x6 its not for this plane.I'm am going to a G26 soon.

warbird_1 09-23-2012 04:41 AM

RE: ZENOAH G26 RPM
 
way to much prop. and go to an APC they are the best prop hands down 16x8 is what i would start at. don't worry about the cowl. it you seen pics of the full scale,it hardly has any prop out the cowl dia. you need a prop that the engine likes , not what the cowl likes. WB_1

dadragon 09-23-2012 07:56 AM

RE: ZENOAH G26 RPM
 
Warbird;I fly scale dont do flips and twirls the landing gear for the most part looks at the ground,I'm kinda like the AD-1 skyraider I go low and slow.


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