2.1 comp-arf YAK

[pepatrick]

Mike,

I have had that problem before. I had the flex pipe and it bends back right after the flange. I took a dremel tool to the head of the bold and filed it to an angle. Then I was barely able to get it in the hole. When that pipe broke after about 8 flights...I got a solid pipe that seemed to have much clearance...I was able to use a new bolt and tighten it up. This is on my EF 50cc Yak...what a pain in the arse...but I have had no problems since then.

	Quote: Originally Posted by reyn3545
	I will have one problem... I decided to go with a canister muffler, and the custom pipe that CompARF sends starts to bend as soon as it leaves the mounting flange. That makes it IMPOSSIBLE to get the back bolt through the mounting flange and into the cylinder head.

[kriel]

Hi i cut down an allen key took some time to tighten (strong fingers and patients of a saint)but with some thread lock ive had no probs, flown with it for over 2 hours and nothing come lose.

[Jamieman]

	Quote: Originally Posted by reyn3545
	I will have one problem... I decided to go with a canister muffler, and the custom pipe that CompARF sends starts to bend as soon as it leaves the mounting flange. That makes it IMPOSSIBLE to get the back bolt through the mounting flange and into the cylinder head. So, I'll make a trip to the hardware store this week and try to find a stud, lock washer and nut the same size as the bolt. Hopefully there's enough room in the bend area to get a wrench on and tighten the nut!

I too had the same prob. But like Kriel said, a cut down allen key works a treat.
I shortened the bolt for that hole & used a chainsaw file to elongate the hole a little.

Should work ok.

But i know what your saying.

[hwka]

I was not aware of this ealier thread when I started mine on the CompARF 2.1 Yak 55 SP / DA50
Those contemplating a build may find some of the information I posted useful.
It is under "Giants Fron Down Under" forum.
Tried to link to it but not sure how that works.

[reyn3545]

OK.. 50 cents worth of parts later, I have the motor, header and can mounted!

I couldn't find a stud the right size for the cylinder head, so I bought a bolt and cut the head off of it, and used a nut on top of it to lock it down. It should be fine.

Here's a few pictures of the motor/header/canister installation. The large hole for the canister is the size recommended by CompARF. I originally had it about half that size, but the body of the can was hitting the fiberblass on the fuse, so I had to enlarge it. The bottom of the can sticks down about 1/2 inch lower than the body of the fuse, so I guess it takes that length of hole to get cleanly back inside the fuse. Not what I had hoped for, but it did give me an excuse to polish up the canister!

You can see in one of the pics where I used the stud and nut in place of the header bolt. Also, to get the header mounted to the can, I got a 1 inch hose clamp (automotive style). I was able to access the screw to tighten it through the hole I cut for the canister exhaust... worked very nicely.

[hwka]

Hi Reyn3545
Yak is looking nice.
I noticed from the photo that your carbon gear is a snug fit.
I fly off a grass strip, which is in pretty good condition.
I found that the flex in the carbon gear to be far more than expected and had to allow at least half an inch topside....learnt the hard way, and that's with soft landings.
Suggest you allow a quarter inch front and back.
The Yak is easier to land than most if the C of G is OK....dribble of power, as she slows down pretty quick, then power off a couple of inches off the deck.

[reyn3545]

	Quote: Originally Posted by hwka
	Hi Reyn3545 Yak is looking nice. I noticed from the photo that your carbon gear is a snug fit. I fly off a grass strip, which is in pretty good condition. I found that the flex in the carbon gear to be far more than expected and had to allow at least half an inch topside....learnt the hard way, and that's with soft landings. Suggest you allow a quarter inch front and back. The Yak is easier to land than most if the C of G is OK....dribble of power, as she slows down pretty quick, then power off a couple of inches off the deck.

Thanks for the tip.. if the gear flexes that much, I need to expand the holes a little.

[reyn3545]

I got a little mroe done over the last few days. I don't know why, but I just can't get motivated to work on this plane. I'll glue a piece or two on, then leave it alone for days.... maybe I've built too many this season.

I got the tank tray and rudder tray mounted. I finally received the replacement stab tube, so I got the servo holes cut in the back of the fuse and finished mounting the horizontal stabs, and I mounted the rudder and cut the holes for the pull-pull wires. This all should have taken about an hour, very easy work... but its been a week!

[pepatrick]

Mike...its a sickness...when I build...I will sit and look at the plane for hours not doing anything. Then..the light bulb kicks in and I know how I am going to do. When I build my 3.0 Yak...I probably spent a total of 50 hours of building...and 150 hours of looking and thinking...and wondering what the hell I am doing....

[~SnApRoLl]

	Quote: Originally Posted by reyn3545
	I got a little mroe done over the last few days. I don't know why, but I just can't get motivated to work on this plane. I'll glue a piece or two on, then leave it alone for days.... maybe I've built too many this season. I got the tank tray and rudder tray mounted. I finally received the replacement stab tube, so I got the servo holes cut in the back of the fuse and finished mounting the horizontal stabs, and I mounted the rudder and cut the holes for the pull-pull wires. This all should have taken about an hour, very easy work... but its been a week!

I thought I was the only one who couldn't get motivated to build a plane!! LOL I have a Comp-Arf 2.3m Extra 330L that I have had for I don't know how long and I just can't get motivated to get it done.
I have a few things done but for the most part I will work on it for an hour or two and then it sits for a few days etc...

Shawn

[reyn3545]

Yep.. the next hurdle is the canopy. I've got the plastic cut, just need to measure/glue the tabs and get started.... right now, I'd just rather stare at it. Some day.....

[hwka]

	Quote: Originally Posted by pepatrick
	Mike...its a sickness...when I build...I will sit and look at the plane for hours not doing anything. Then..the light bulb kicks in and I know how I am going to do. When I build my 3.0 Yak...I probably spent a total of 50 hours of building...and 150 hours of looking and thinking...and wondering what the hell I am doing....

No wuckin' furries mate....the crazy ones are those that do NOT do that.