flygilmore

So, this afternoon I go out to start my brand spanking new Zenoah G62 (totally stock) that resides on my kit built Giant Aeromaster for the first time ever. Going through my mind are all the stories that I have read on here of how terrible this motor is to start by hand on the stock mag. ignition-people who have flipped all afternoon to no avail. To be honest, I kind of expected to not be able to get the motor to pop much less start.
I proceed to flip the prop over until the carb was spitting fuel out and once it did, I began flipping, not slapping mind you. Would you believe that 10 flips later, my new G62 starts and is running just as smooth as could be.....I was floored!! and in disbelief!! I let the motor run and warm up and adjusted the needles to a setting that resulted in a smooth idle, transition and approx. 200rpm less than peak and will leave it there to begin the break in process. I was using a Pro Zinger 22x8 which yielded 7450rpm with only 8oz of fuel through it-right at 250 less than what my DL50 turned the same prop at a couple of months ago. I shutdown and restarted 4 more times and each one took exactly 1 FLIP!!!!!! over about an hour time frame.
Needless to say, I am extremely happy with how easy this motor starts-almost to a point that it is hard for me to believe. I have never had a G62 before-only read here in the forums what others had to say about them and their nature. For those of you who say that they won't start by hand easily, I just don't buy it anymore....I have had EI engines that were tougher to start than this one!

In case you are wondering, I did not locate my prop on the hub cutouts as the manual mentions but instead, lined the first magnet up about 1/4" from the pickup and placed my prop tips @ 9 and 3 o'clock. Also, it does not take any slapping whatsoever, only a firm flip to get a spark. Perhaps the many, many people who claim that starting one of these is way too laborious just didn't know the importance of prop placement and flipping technique??????

Tired Old Man

My Feedback: (1)

You discovered the secret to hand starting a mag equipped G-62. Simply orient the prop correctly and get it wet. The single flip re-starts are rather common. Didn't mean to burst any bubbles but they've always been that way. Some have been trying to get those points across for many years and I'm real pleased to see you found it the first time around.

Rcpilot

My Feedback: (78)

You're smarter than me. I can't do it. []

JEFFRO503

My Feedback: (9)

Now....just when your all happy with it....un-bolt it , pack it up and send it into ralph Cunningham so he can shave 2lbs off of it HAHA!! Nothing wrong with a G-62. Some guys just like to put it down because it doesn't look all pretty. I am planning one day of getting a G-62 Lite from ralph and putting it on a 98" GeeBee Y.....perfect fit.

flygilmore

You know, since I am using it on the GA, I don't care to take any weight off of it and I love the reliability of the mag ignition not to mention the simplicity. I was amazed at how little vibration there was, I was expecting to see stuff being pounded yet it has less vibration than my DL50! Guess it shows that even though the majority will say one thing, personal experience can say something totally different-this is a really sweet engine!!!!!

Pelle Gris

I have been running a stock G-62 for some years now. My only complaint is that when I set the idle very low, say around 12-1300rpm, it does shake quite a bit due to the fixed timing. When kept around 1500 there´s no problems. Most hot starts are one flip, and from cold it will start in about 3 flips after the initial "pop" during priming.
I have the prop mounted so it meets compression at around 11 o´clock. That way I can start the swing at 2-3 o´clock and get good speed on the prop when passing the pickup.

Right now it´s mounted on a 1:3 scale Pitts S1-S, weighing in at 18,3lb fueled. Prop is a MenzS 26x8 with the tips squared and painted to look scale. I thought about converting the engine to IE, but that would mean a lot of work relocating radio gear, possibly adding lead to the front, and the need to carry yet another batterypack in addition to the two onboard already. So I dropped that idea again... :-)

RTK

My Feedback: (1)

Nothing wrong with a G62, especially after it is lightened

arobatx

"Prop is a MenzS 26x8"...?????

Pelle Gris

Yep. Close to scale size, and it cut´s down on the noise. I normally use a 24x10 MenzS, but this looks a lot more scale being a bit bigger.
I have taken 14mm of each tip, about 0,5in, thereby making the tips square. Max rpm is 5600, and it provides plenty of power for scale aerobatics. And then some..:-)

Edwin

My Feedback: (2)

You use a 24x10? I need to try that. I normally use 22x10.
Edwin

mrbigg

My Feedback: (21)

I used a Mejilik 23x8 Carbon and didn't care for it. Spool up wasn't too crisp. The 62 likes to rev. I'm shocked it doesn't overheat with the 24" prop. Pelle, do you have any video of your setup?

Pelle Gris

It´s all dependant on the muffler used. A friend of mine runs his G-62 on a glider tug, equipped with a Krumscheid tuned pipe. This setup spins a MenzS 24x10 at around 6600 to 6700rpm, the same as the GT-80 on standard mufflers.
With the muffler I use max rpm are around 5800 with the 24x10, and 5600rpm with the cut down 26x8 MenzS.
I don´t care much for 3D flying with other than my indoor foamthingie, so spoolup is of no importance for me. I try to fly the Pitts as scale as possible, and the 26x8 does that perfectly. Nice deep sound, plenty of speed and more than enough power for scale aerobatics.
There are no indication of the engine overheating as far as I´m aware, and due to the large cooling fins I don´t think the engine is overstressed. I also only use full power rarely on the Pitts.
Unfortunately I have no video of the setup.

I have no doubt that I could get more power from the engine by using a smaller prop, but I like the look and performance of the bigger props, and due to noise regulations here in Denmark it´s also nessecary to limit the prop noise somewhat. Most people use either a 24x10 2-blade, or a 21x12 3-blade narrowblade carbon prop on the G-62 for good power, and low noise. I just lower the rpm´s to get the same result.
Most clubs have a max soindlevel of 94dB measured at 3 meter, or 9ft. This is only possible with the right silencer, prop and maybe even vibrationmounts for the engine. Besides that my engine is mounted with a carb "elbow" that turns the carb 90° to the rear, so with a suitable carb "trumpet" the intake air is taken from inside the fuselage.
It would be much easier to live in the US, where noise seems to be of no concern...:-)

mrbigg

My Feedback: (21)

That's a drag about your guy's noise issues. Our field doesn't have that problem, but some do over here.

Edwin

My Feedback: (2)

I can see your reasoning. Makes sense.
Edwin

flygilmore

Well I am using the POS 22x8 Pro Zinger for break in and then will be going to either a Vess 22B or 23A for normal use on my Giant Aeromaster. I haven't really heard anyone talking bout using this prop on a G62 but I love them on my DL50.

mrbigg

My Feedback: (21)

What kind of RPM are you getting with the 22x8?

Kweasel

My Feedback: (29)

You can gain at least 200rpm in the 6000rpm range by lowering the cylinder. Raising the floor of the induction port with epoxy will improve idle and reduce spitting. I like my modified G62 propped at 6000 for low noise and vibration. I tried running popular props at 7000+rpm but noise and vibration doubled.

Pelle Gris

Kweasel: That sounds interesting. How do you "lower the cylinder"? Do you remove material from the lower part of the cylinder? And when you say that you raise the floor of the induction port, do you mean that you raise the port height to original heigt after lowering the cylinder?
Do you have any rpm measurements before and after modding?
What kind of props and exhaust do you use?

Thanks

flygilmore

mrbigg, I was getting 7450 with the ProZinger 22x8 on the very first tank and without optimal needle settings.

Ed

Yer need to run more prop ! That RPM is too high.

Engine is unloading too much.

Ed

arobatx

That RPM is nothing for that engine....it could unload a bunch more without problem. It also could be running a far more productive prop

CJW123

There is NO rpm limit for a G62..
Racing STOCK G62s turn up to 9500 UNLOADED in the air...FOREVER (well almost) with NO problems...
toni-clark.com has the rpm and torque chart, you might learn something about Zenoah engines on that website. Instead of just repeating conventional(?) wisdom(?) repeated ad nauseum on these forums...

RTK

My Feedback: (1)

You can get all the torque/hp curves directly from the zenoah web site. I usually prop my 62 for around 7000 static on a non restrictive muffler, more when piped.

NM2K

My Feedback: (14)

Some years ago, Husqvarna sold an ignition module that was intended to be used with magneto equipped engines. It's purpose was to provide spark advance/retard for their magneto equipped engines. This module works with virtually all brands of magneto equipped engines. Who knows, it might just get rid of that low end shake, if one can locate said module.


Ed Cregger

flygilmore

Yeah, those rpms are nothing for the G-62, Ed doesn't know what he is saying. I agree on the ProZinger...didn't you see where I labeled it a POS???? Anyway, I am using it for the first gal. or two to let the motor rev a bit and reduce load on it and then will be changing as allready mentioned to a Vess. I have also seen where Ralph has stated to not let the 62 exceed 13,000 and all would be just fine.