RustyTumbles

I picked up the GF45i today. I've now got it bolted up to the extra, I am in the process of trimming the engine box to fit the muffler and mounting the ignition and throttle servo. I will need to replace the muffler as the mounting bolts have been over torqued and it has cracked the muffler casing in several spots. This may have contributed to the unreliable running the previous owner was complaining about.

Also I was mistaken with the prop size I quoted earlier. It was in fact a 21x10 bolly carbon!! I will try a 22x8 and see how that goes, if need be I'll step up to a 22x10.

I did weigh all the components before fitting them. The motor, muffler, ignition, and ignition pack (6v 1100mAh) weighed in at 1.795KG. Which is a saving of over 0.2KG from the G38.

Also I was asked about the timming on the engine. At top dead centre the magnet in the prop hub is slightly past the hall sensor. Is that correct? I think it is as it should fire before reaching TDC.

RustyTumbles

Here's a pic if the engine at top dead centre.

Does this look right?

RustyTumbles

Here's a few of the engine installed and the cracked muffler:

reynolds74

Hi everybody,

If somebody could be interested, I can supply the CRRC 45 complete with aluminium silencer for 250 Euros only (plus shipping).
I deliver worldwide.
As gift I include on each engine sold a complete spare gasket set.
More, all the spare parts are available in one week.

You can contact me at this e-mail address: [email protected]

Bye.

Andrea

RustyTumbles

Is that you will have spares in a week? Or if I order I will have them in a week?

reynolds74

Hi Bigsport,

I can get them in one week....as soon as I'll get back from my holiday
I explain you (and everybody) in these days I'm back home for my holiday and I have ready available one CRRC 45 (new obviously), 3 gasket sets and 3 spark plugs.
If somebody needs something else, I can get the engines and the spare parts in one week, starting from 10 September.

Bye.

Andrea

TooLy

HI Bigsoprt,

Your timing looking OK.
So you got 7200 with 21x10 carbon ??? that's really good, after breakin-in it should be able to spin props like all other 50cc.
Looking forward to the flight report [sm=wink.gif]

TooLy

Where is the post of the guy with the parts from italy ???
bigsport, how was the g-38 in your extra ? I have a friend that running G-62 on it and it's crazy but heavy.

reynolds74

Somebody erased my previous posts.....

If you wanna contact me: [email protected]

Bye.

reynolds74

Ops.....sorry,

I writed the wrong e-mail. Here's the right address: [email protected]

RustyTumbles

I don't know where the post is, it's gone. The g38 was ok it flew well but heavy. Verticle was reasonable but no where near unlimited. It was a good engine to learn the ropes of gas power aeroplanes.
The extra should be almost 500grams lighter with the new motor and rudder servo. Which will bring it down to 6.7kg (14.7lbs) from 7.2kg (15.8lbs)
I am debating whether to get a 22x8 or 22x10 and try that.

I have also changed the spark plug to a NGK BPMR7A. Did you get a chance to try different plugs and props tooly?

TooLy

I think you should go with 22x8 for good transition, 22x10 is too much and you didn't finished the break-in yet.
I found that the best plug is the NGK BM6A.
Your plug have a projected tip (P) which don't work quite well with mixture.
Other than that you also have a resistor in your's and it's one step colder (7), just try it and let us know how it works.
You should get a very good performance at 14.7 lbs, after you said that it hovered the WH at 16 lbs.

RustyTumbles

What do you mean by a projected tip?

RustyTumbles

I think I will try the 22x10. The reason being, I went from a 18x8w apc on the zenoah G38 to a 19x6 and it was a lighter load on the engine which caused excessive rpm (almost 9000). If the gf45 is now turning a 21x10 at 7200, a 22x10 is only 1 inch bigger and should drop the engine into the ideal rpm range (6700-7000rpm). I plan to run the engine on the ground for a few tanks and get it tuned right and see how it handles it.

TooLy

You can now see in the photos what is a center electrode with projected tip vs normal.
Un projected tip become much less dirty than projected.

RustyTumbles

Ok thanks!!! Tooly.

I've done a temp repair on the muffler so I can get it running until I can get a new muffler. I used high temp silicon form-a- gasket. I also used so gasket paper to seal the gap between the engine and muffler. Hopefully it will hold up for a week or two.

So the muffler is on the engine and next is mount the ignition and battery and install throttle servo and kill switch. Hope to have it running by friday.....

TooLy

I also used high temp blue silicon (gasket maker) for the muffler port since it didn't sealed well.

RustyTumbles

is it holding up still?

TooLy

Yes, very well.
I took the metal gasket, cleaned it and put that silicon in both sides.

DesertHucker

Bigsport
Just brought one of these second hand. The muffler on it broke in half.
I am going to remove the cylinder and rotate it 180deg and then fit a aftermarket muffler made for the zenoa g45 they ers the same cylinder.
Looking at the zenoa pitts muflers they look smaller hopefully will be lighter.
Also this egine has a modified carby flange to stop it leaking at the intake manifold on the head.
and the stock battery has a shocking short life about 5 minutes seems all right but engine runs un reliable.
changed the battery all these problems whent away.


Lawrie

RustyTumbles

Yeah I did think of doing that, but the muffler was able to be repair enough until the new one gets to australia. Have you got any pics of the engine and the mods? I will be running a sanyo 6v 1100mAh pack on the ignition, so that shouldn't be a problem. What size prop is yours turning and how much run time has it had?

RustyTumbles

Here's a few pics of the temp repaired muffler:

DesertHucker

No picks of it yet a felow flyer at our field still has it. I know he was runing in with a 20x10 prop

RustyTumbles

I've done a bit more work on the extra today and got the ignition mounted and the throttle pushrod hooked up. Just have to fine tune the radio setting to get the right throw. You don't need much movement as the arm on the carb is very small, so don't expect to use a large arm it's just not needed.
I will also need to move my Rx packs and Rx around to get it to balance properly, I'm still tail heavy but I plan on putting the ignition pack up front and the plane hasn't got the cowl or spinner fitted yet. I'm getting there slowly so we should be good to fly this weekend if the weather is good.

I'll post more pics soon.

reynolds74

Hi guys,

about the spark plug: the original one mounted on the engine was a Torch BM&A, but the ones I bought as spare parts are Torch L6RTC (with projected tip).
Now I was wondering what about the spark plug "degree", I mean, for what I now could be dangerous to get wrong the spark plug, up to get a hole in the piston.
And more, how much should be the spark gap beetween electrode and tip?
Anyway....who is erasing my posts???

Andrea