FRICKING AWESOME AIRCRAFT!!!!!!!!!

[Smacka]

All:
It has been awhile since I posted having issues with my Areoworks 1.20 Yak 54...but...but...but I installed an OS 1.60 and the "CG" came out exactly as stated in the manual.

Today was the maiden flight. Here is what took place:

1) Absolutely zero radio trim required to fly this bird.
2) A tad weak punching out of a hover. I "may" need to change props. I am running an APC 18x6w.
3) KE with zero drift. Bird does not trail off either direction.
4) Bird stays where the pilots puts it...zero drift. Very clean 4-point rolls. Snap rolls are sic...just sic I tell you!

One minor hiccup...engine stalled twice while inverted. Seems when I assembled the fuel tank I did not compensate for the fuel line swelling in the nitro. The clunk hangs up slightly at mid tank causing the engine to suck air.

I had a ball with this bird, and it has power to spare. Can you say "keeper"?

Can anyone recommend a better clunk for this bird? I have heard there is a ceramic clunk that is the ****z. Anyone know of where I can find one?

Thank you!!

[zoomer260]

Not sure what ya mean by the "swelling" of fuel line with nitro. Seems I have never had this issue. I'm thinking maybe it's just too long ?

[2robinhood]

I am assuming you mean a 1.60FX and not the four banger.
What is the weight of the Yak?

[Mithrandir]

Central Hobbies.... Tetrus tank and/or a perry pump...

If you are using a Pitts Style Muff... pinch the exhaust tubes about a tenth of an inch so it is an oval instead of round..... this gives a little more pressure into the tank

But the perry pump is also a must.

[ferocious frankie]

Congrats! Put on a Vess 18x6 on that thing and watch out! C.G. shouldn't be a problem besides a little tail heavy is great for 3D.

[Extra nuts]

Piching the pipes is not neccesary and only piches's off HP. Ive tried it just because i heard so many peeple trying it i thought there must be somthing to it. Yah there is. A bunch of people ruining pipes. That's what it is. Its a great way to ruin a perfect pipe. I have never had any problems with O.S. 1.60's. Pumps are nice but again not neccesary. Use a softer peice of tubing with a heavier clunk inside the tank and make sure your fuel tank outlets tubes line up very close to right behind the carb(width and height) and that your tank sit level(flat). Other than that you need to fully break in this engine before you can tune it for max efficiency. Also use larger fuel tank outlet tubing and fuel lines.The engine cutting out when you go inverted should be fixable with the needles and or the fuel tank. Say no to pinched pipes. Not trying to badmouth you at all mith. Iv'e just experimented way to much with these engines and know that satifaction is available with just the basic setup. Try a wood prop too. The APC's are ridiculously heavy and put an extra load on the engine. I reccomend a 17x8, 17x9 wood for better punch out RPM's. Unless your at sealevel with good air quality i think an 18x6 prop loads the engine too much. Especially a heavy APC. Use Powermaster 10% or 15% or any fuel with at least 18-20% oil. 1.60's seize on 15% Magnum (red) fuel unless you add so much extra oil that i runs like crap. !!! Just my two cents.

[Smacka]

	Quote: Originally Posted by 2robinhood
	I am assuming you mean a 1.60FX and not the four banger. What is the weight of the Yak?

Yep, the 2-stroke...

Hey Frankie...what a bird, eh?! I want to try the Vess. One of our club guru's said the very same thing. Stated the Vess wood responds right now.

Another pilot in this thread stated break the engine in first...good advice! I do need to put more fuel and time through this engine. It runs like a rapped ape right now. I am running slobbery rich at the moment.

I have heard you need a perry pump and pinch down the pitts tubes, as well. Not to sound condescending or ignorant, this engine is running extremely strong and only cuts out while inverted for at least 15 to 30 seconds...just about enough time to run the fuel out of the clunk and lines when your clunk is stuck at the back of the tank. It will stand rolls and loops without the least bit of sputter during inverted portion of the manuever, however, when I stay inverted for a time that is when the engine quits.

Yep, line is about 1/8 to 3/16 too long, and the tank is right behind the fuselage.

Have fun...

[Extra nuts]

One other note i might mention is that the 1.60FX makes noticably more power with the Slimline pitts(round with larger downtubes) than the Bisson's(oval shaped, already semi pinched at the ends). Minimum of 1 1/2 gallons for break in. Dont run it too lean either. Use O.S. no# 8 plug. Baddass little engine.

[super_nova]

What size fuel tank are you using with the 1.60 and how fast are you running through it. I've been trying to find some more info on this plane and engine setups to see how it did on an OS 1.20AX or Saito 1.25... but it sounds like most people are running more powerful setups.

[mikeh]

I had the same motor in a EF 74" Yak. Great motor! Ran a 18X6W prop, never tried the Vess on that motor. I put a Perry Pump on mine because I didn't like the mixture changing as the tank emptied out. Ran Omega 5% fuel. I really don't think it needs all that nitro. After that motor gets broke in, it will make your Yak haul a$$.

Mikeh

[ferocious frankie]

	Quote: Originally Posted by super_nova
	What size fuel tank are you using with the 1.60 and how fast are you running through it. I've been trying to find some more info on this plane and engine setups to see how it did on an OS 1.20AX or Saito 1.25... but it sounds like most people are running more powerful setups.

Anything 1.40 and up will be fine for this airframe. You will need the extra engine for the CG and the power!!! Mine has a Saito 1.80 and it's great!

[Smacka]

	Quote: Originally Posted by super_nova
	What size fuel tank are you using with the 1.60 and how fast are you running through it.

24 oz tank, and since I am running so rich I go through it very quickly BUT that will change after break in.

Like Frankie stated, the heavier engine is necessary to obtain the stated "CG", the extra power is a bonus

[super_nova]

	Quote: Originally Posted by Smacka
	Like Frankie stated, the heavier engine is necessary to obtain the stated "CG", the extra power is a bonus

Sounds like this thing is begging for a little gasser up front!

[TONY0707]

HI A very accomplished flyer that i fly with runs an OS 4 stroke glo plug in the OS 1.60 fx with very much success-- seems the larger two cycle glo engines like that plug---and his engine is mounted inverted in his pattern plane---he is flying the pattern circuit for 17 years--he uses a 60 size tuned pipe on that engine---his plane flys unreal . it is his own design. it is a joy to watch him fly that plane at the field ENJOY REGARDS TONY

[plowboy]

I've run a 1.60 in a Yak almost exactly the same size as the AW for the past year and a half and it has plenty of power. I moved the tank (20 ounce) rearward to the tube for stable performance throughout the flight. I put the perry pump on it from the start and run the Bisson pitts. I have heard that the Slimline makes more power but I don't need it. It swings the APC 18 X 6 W with authority, about 8400 or so on 10% CoolPower. I have many many hours on this combo and am just now getting some play in the rear bearing. No worries, I have replacements already and they will go in very soon. Enjoy your plane. As the engine breaks in you will have plenty of power. Address the plumbing issue and if that doesn't fix it then go with the pump. Don't sacrafice performance by plugging off a perfectly good pitts. JMO.