DaddySam

My Feedback: (9)

Although the engines were not set up identically, they are set up the way I'm going to be flying them, so it's not a "scientific" test. At any rate, I've been running engines in the back yard. The 3W was with Keleo live exhaust, and delivered 6250 rpm with the 3W 22x10 prop. The G 62, with the same prop, but with a Bennett exhaust, delivered 6750 rpm. Neither engine is fully broken in yet. For what it's worth, since many seem to want to compare the two engines.
Sam

fishgod

My Feedback: (13)

Sounds like the Kleo muffler is restricting the 3W.

DaddySam

My Feedback: (9)

I don't see how it can , because it's just a header into some straight pipes with stacks, but you never know. I ran some tests this summer and compared them to another flier on RCU who was running a Johnson pitts style muffler. My numbers were about the same as his. I do have a Johnson Pitts muffler for my 3w-50i, so maybe I'll try it out one of these days.
I'd be interested to hear what other folks have been getting with the same prop.
Sam

rc bugman

My Feedback: (30)

Hi,

I have tested both engines and the G-62 is a stronger engine than the 3w-50. Those extra 12 cc make the difference. If you were comparing a 3w-60 to a G-62, the 3w would be stronger.

The extra 12 cc on the G-62 along with the long unsupported shaft from the front bearing make this engine have a higher level of vibration at WOT than the 3w-50 by a significant amount.

Elson

AirWizard

My Feedback: (3)

Using a xoar 23 x 8 on my 3W55i with 1 gallon fuel I'm getting 6500 rpm

fishgod

My Feedback: (13)

Granted I am only a couple hundred feet above sea level, low humidity and cool temps but I get 7200 on a Mejzlik 22x10 on a Taurus 52. I do know that the Mejzlik spin a couple hundred more then 3W, Menz, ect.. but I would have thought that the 3W would have spun it a bit faster.

I do know that there is know replacement for cubic inches and I am not doubting the G62's numbers. To me the 3W looked low.

rc bugman

My Feedback: (30)

Hi,

3W props are harder to turn than most other brands. Across my 13 - 3w-50s, a Bolly 22 x 8 turns around 7K rpms and a bolly 22 x 10 turns around 6500. Bollys spin faster than a 3w prop, so your rpms are in the right range.

Elson

DaddySam

My Feedback: (9)

Thanks for the numbers. It makes me feel good about my setup. I am on my last 3W prop, and have a couple of Xoar 22x10 props waiting. I do have a Mejzlic 22x10, but have not had a chance to run it on either of my 3W-50's yet.
Elson, I want to thank you for your willingness to share your experience with these engines. Due in part to your research, I'm switching over to Pennzoil Air Cooled engine oil.
Thanks again,
Sam

edgeman55

My Feedback: (25)

Above statements said it all.You can't compare the G-62 to a 50cc 3w.I had a 3W 60i and it turned a Menz 24X10 at 6200 rpm.That 3W single was as smooth as any twin I have run.The 3W's I have run seem to like load with a little lower rpm's.

rc bugman

My Feedback: (30)

Sam,

The oil test was a joint effort with Ralph and Dick adjusting my thinking to the higher oil ratios before I ran the test. I just went through my 13-50s for winter maintence and pulled the cylinder after a summer of running with 40:1 pennzoil air cooled. The carbon accumulation was greater than the 20:1 picture but the carbon was soft unlike Amsoil carbon which is hard and brown. One of the reasons that I accumulate more carbon on these engines than on the test engine is that I run the engines on research planes slightly rich. When at WOT for 30 min stints, if the engine burbles slightly, I am happy because the cost of an engine quitting on liftoff or during the flight from being too lean is too costly. On liftoff, there is over 4 lbs of fuel which will be burned of during the flight and about 5 lbs of impact sensitive electronics onboard. With a wing loading in the high 50 ozs per sq ft, loss of an engine before you get a couple of hundred of feet in the air means the destruction of an airplane and loss of expensive equipment.

Elson

Flip and Fly

I had a 3W 60i some time ago. Lets compair cubes for cubes The 3W could turn a Menz S 22-10 as fast as the G62 could turn a old standard 22-10 Zinger. Both at about 7200 rpm. Put the Menz S on the G62 and it could not turn it much more than about 6900.

Seems to me that reed valves work well and the 3W was built with a longer stroke, more apt to turn big props. The G 62 likes to rev! Big bore, short stroke. The G62 is a fine motor, but the 3W 60 was stronger and could handle a more load. Put a 20-12 APC on the G62 and the 3W and they both turned about 7500. Hmmm, whats up with that.

Also my 3W was not that smooth really, but about the same as the G62. My Zenoah 445 twin was smooth

Frankly I don't think a big single can ever be as smooth as a good running twin of the same displacement. Never seen it my self.

ramcfarland

My Feedback: (44)

How is hand starting on the 3W-60?

cap10b

All,
My 3W-50I would spin a 3W-22-10 wood at 6350 RPM and thats new out of the box. This motor didnt come alive
until I prop it down to 23x8 biela turning 6060 now the motor really pulls hard.

jds

Pelle Gris

I have found that the muffler has a huge influence on how the G-62 runs.

Standard old "box" muffler: 5000rpm / MenzS 24x10
Stainless muffler from Toni Clark in Germany: 5800rpm / MenzS 24x10
No muffler: 6200rpm / MenzS 24x10
Full length tuned pipe: 6800rpm / MenzS 24x10

So to make a fair comparison both engines would have to have more or less similar exhaust systems, properly adjusted.