Video/Perfromance Review-QQ-Yak69"

[Reza]

I took my 69” QQ-Yak for a ride on Saturday. I had a blast with this plane. I have flown this plane with two different engines OS 1.20 and YS 1.10 and have videos of each for you to watch and also I have some comments on the performance of these engines with the same exact plane.

OS 1.20AX

Very smooth running engine, very strong, really easy to run and tune, very little vibration, Quiet, cheap to run with 15% fuel. Both sports and 3D flyers can be very happy with this engine. With 16x8 prop, plane will fly faster than a warbird and with 17x6 will really do good in 3D, however the midrange torque and the punch is not there. What I like about gas engines is the midrange torque and punch, OS 1.20 is a little week in that area, you should rev higher RPMs to achieve the needed torque but pull out from hover is really strong because you are pulling out full throttle and engine can pick up some serious RPM.

Things I like about OS 1.20AX:

1. Runs great out of the box and easy to tune
2. Muffler is awesome
3. Quiet
4. Vibration is very low
5. Cheap to buy
6. Cheap to run
7. Very strong and top speed is simply amazing

Cons:
1. Lacks mid range torque for extreme 3D pilots. If you are a sports flyer, this should not matter at all.

YS 1.10S

Well, I mounted the engine side ways jus like the OS 1.20. I had to play with the low needle to get it running fine. Recommended adjustment on the low end was way too lean for me and engine would not stay running. Vibration is more than OS! Make sure that you DO NOT run the engine on the fuse only, you NEED to have the wings on. Engine is brand new with only 3 tanks! It was turning a 16x6 APC at 9300 with YS 20/20 fuel and rich settings. Pull outs very amazing and as good as OS 1.20. Top speed a little slower as expected but still very fast. Mid range torque was phenomenal! I thought I was flying a gas engine like DA50. Punch and thrust was right there. You could modulate the throttle a little and see the thrust kicking in and plane is moving! Awesome mid range torque. Plane would do much tighter waterfalls and tumbles due to torquey motor! Would be a perfect choice for intermediate and advanced 3D pilots.

Things I like about the YS 1.10S:

1. Very strong engine
2. Thrust was phenomenal
3. Transition of throttle and effect of thrust were like a gas engine

Things you need to watch out for:

1. If not tuned properly can shake the plane pretty bad! It is not hard to tune but it requires more attention. Also you need to service the engine almost every two hours flight time. By service I mean check/adjusting the valves.

2. Check on the muffler to ensure tightness each flight for couple of flights and then once in a while. If engine backfired on you, make sure to check the muffler and prop nuts before you start the engine and fly it again.

3. Since it is a pressurized system, make sure to check your tank once in a while to ensure safety of plumbing and monitoring the condition of the tank.

Cons:

1. Engine is a little harder to tune in compare to OS but certainly doable and once tuned in right, it purrs!
2. A little more expensive to run as it needs YS 20/20 fuel

Now on the plane side, this plane is simply an unbelievable flyer. I even like it better than slightly bigger ones. Light wing loading, very responsive, rock solid in 3D, power to weight on OS1.20,YS 1.10, Saito 1.25 just phenomenal! Unbelievable is the word. I weighted the plane with OS 1.20 and it was 8 ½ lb no spinner. With YS 1.10 should be an ounce or so heavier and you can see from the video that it flies like a rocket! To those that want to learn 3D and are not ready for bigger airplanes, I say watch the video. Plane is capable of anything you throw at it, Look at my inverted harrier, do you see much input? This plane will not be limiting your skills, in fact it helps you. Put the SFGs on and even get more help if you need. You learn 3D on this plane, you can easily grab a 50cc plane and do the same thing with it! This plane gives you that feeling.

Best Regards,
Reza Gholamipour
http://www.rcmodelaviator.com/Videos/Yak69_YS110.wmv

[Reza]

Here's the video posted on FG for non-lurkers


http://www.flyinggiants.com/gallery/...hp?photo=39642

[ben_beyer]

I'm running 30% Helicopter fuel in my 110 right now and I'm going back to the YS/Saito 20/20. It has too much power. I also need to set up a throttle curve because one bump and it's climbing out of a hover and plus the pump comes on around where the stick needs to be for harriers and causes the airplane to rock from the torque. Other than that, it's an awesome combo. I just need to fine tune my set up.

[3D-Seth]

Looks great as always Reza!

[Reza]

Ben,

I agree, it's really over powered. I am not sure if you can tell from the video or not but when I was flying the plane with YS 1.10 there was 5-7 mile wind down the runway and when I put the plane in inverted harrier I barely could touch the throttle or it would go to hover. Once you dial this plane in, you will have a blast with it. Everything is just perfect, Low wing loading, Incredible Speed, Very Precise in stops, Awesome power to weight,...

Reza

[ben_beyer]

I've had the same experience. When I was flying in CO, it was what I would consider perfect power. Not too much and certainly not too little. However, being back at 500 ft. above sea level instead of 5000 ft. and running 30% helicopter fuel, I think I have too much power. I'm sure someone will disagree with me that there is such a thing, but I think you can.

[torbenp j]

Hi wher is Video with the OS 120 ax???
the YS work very nice

[Reza]

Hello,

http://www.rcmodelaviator.com/Videos.html

Video number 10 and 11.

Thank you,
Reza

[torbenp j]

thanks.. nice web

[enephel]

What prop did you use on both engines? Were they both the same size? Will the 1.20 handle a 18" prop and also are you going to sell the OS?

[krayzc]

kewl

[Reza]

If I remember right, on the OS 1.20 I used APC 16x8 and 17x6. I liked the 17x6 for 3d a little more than the 16x8 but speed was incredible with 16x8.

YS 1.10 I think I am using 16x6 APC. I will check this evening if I did find anything different I will edit my post otherwise it is 16x6.

Thank you,
Reza

	Quote: Originally Posted by enephel
	What prop did you use on both engines? Were they both the same size? Will the 1.20 handle a 18" prop and also are you going to sell the OS?