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New Somenized (TM) 69", Yak-54

 
Old 08-10-2007, 11:17 PM
  #76  
Rezagh
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Default RE: 69" QQ Yak-54

HI Marlin,

I would fly it without spinner first. I think you would like it without spinner. After flying it decide if you want to add a very light spinner or not. 3 1/2" Extra or P-51 style would look really good!

Good Luck!
Reza
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Old 08-10-2007, 11:19 PM
  #77  
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Default RE: 69" QQ Yak-54

Hi All,

I will be redoing my plane with YS 1.10 so compare the performance in compare to OS 1.20 AX. I will keep you posted.

Also an Electric conversion is in the works as well. That should be a lot of fun too. I will keep you updated on that. The YS and OS performance comparison on this plane will happen prior to Electric conversion.

This should make it very clear as which engine would give you the best performance.

Reza
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Old 08-11-2007, 01:44 AM
  #78  
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Default RE: 69" QQ Yak-54

My money is on the mighty 110. I don't think that engine can be beat in this class.


Let us know what you think. When will you have some info?

Good luck.

THanks
Barry
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Old 08-11-2007, 06:06 AM
  #79  
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Default RE: 69" QQ Yak-54

rezagh, what do you put on it to start it? Are you flipping the engine? Or are you using a starter? Do you have any pictures of the from of this plane? I will keep you informed of how that motor works for me. Marlin
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Old 08-11-2007, 11:57 AM
  #80  
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Default RE: 69" QQ Yak-54

Hi marlin,

Yes, I use a starter. The OS starts with one rotation. I assume you could use a chicken stick. I will post pictures once I install the YS on it.
I will post plenty of pictures for the electric set up when I receive the parts and get to start on it. I need to build a new plane for that and with current projects I have in hand it will take some time.

Regards,
Reza
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Old 08-11-2007, 04:46 PM
  #81  
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Default RE: 69" QQ Yak-54

Reza send me a plane to demo and i will build and Electric and post losts of nice things on here. Built if you can show me the front of the plane, do you just put starter up againt the prop? How do you think the 4 stroke will do compared to the two stroke 120? Marlin
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Old 08-12-2007, 10:46 AM
  #82  
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Default RE: 69" QQ Yak-54

Chris (cje0114)

Have you got any flight reports of the 69" yak with a saito 125 yet?

Thanks
Jonathan
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Old 08-12-2007, 07:13 PM
  #83  
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Default RE: 69" QQ Yak-54

I put 5 flights yesterday, and 9 more today.

The Saito 1.25 is a perfect match for this plane. It came out out at 8 pounds 2 ounces RTF. Vertical is unlimited, and hovers are 1/3-1/2 throttle with a very nice pullout.

The Yak is a 3D monster, but it really shines with precision flying. This plane really grooves through the IMAC sequences.

Chris
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Old 08-12-2007, 07:27 PM
  #84  
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Default RE: 69" QQ Yak-54

Here's some pictures from yesterday.





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Old 08-12-2007, 07:33 PM
  #85  
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Default RE: 69" QQ Yak-54

Here's some more.









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Old 08-12-2007, 07:37 PM
  #86  
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Default RE: 69" QQ Yak-54

Last one

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Old 08-12-2007, 07:54 PM
  #87  
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Default RE: 69" QQ Yak-54

Great Pictures Chris.
Thank you for sharing!

I knew the Saito 1.25 would be a great macth.

Whenever you get a chane please some pictures of your engine install for those who might want to try it with Saito 1.25!

Regards,
Reza
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Old 08-12-2007, 07:58 PM
  #88  
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Default RE: 69" QQ Yak-54

Thanks Reza.

I'll be pulling the cowl off one night this week to go over everything and make sure all the nuts and bolts are tight on the engine and mounting hardware along with a complete check of the entire airplane.

I'll post some pictures as I take the cowl off to show my install.

Chris
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Old 08-12-2007, 09:56 PM
  #89  
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Default RE: 69" QQ Yak-54

Hey Reza,

I really like the way the Yak 69" is so light, and it looks like exactly what I'm looking for. I have an old YS 120 AC that pulls like a horse. Right now I have it on an old Goldberg Sukhoi that weighs 10.5 lbs with 28 oz/ft^2 wing loading, and the vertical capability with this engine is unlimited. The problem however, is the high wing loading, which makes the plane very ponderous and sluggish. This is what makes the Yak 69" so attractive.

Would the YS 120 AC be a good fit for the Yak 69"? The engine weighs about 32 oz without muffler, and I would use a Slimline Pitts style muffler if I put the engine in the Yak 69". I would also like to mount the tank close to the CG. Would this be a problem?
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Old 08-12-2007, 10:08 PM
  #90  
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Default RE: 69" QQ Yak-54

Hi Brenner,

My only concern is balancing the model. Mine with OS 1.20AX that 10 OZ lighter than yours balanced well without the spinner. I think it is doable but will require you to take some extra steps. Moving the tank is possible but not very easy due to wing tube guide. Actually I would have to look at mine to refresh my memory on that.

Power and wing loading should still be fine with that engine. My electric set up will weigh more than OS or YS set up and I am confident wing loading will still be good!

Good Luck,
Reza
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Old 08-12-2007, 10:30 PM
  #91  
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Default RE: 69" QQ Yak-54

Brenner,

My Saito weighs 24 ounces with the muffler. It was still nose heavy, but I was able to get the CG correct with the fromeco 2 cell battery that I'm using. I had to build my own battery tray for it though. I haven't put my spinner on yet, but it should be ok since it's a lightweight carbon fiber spinner.


I'm at 8 pounds 2 ounces and this thing flys crazy light, and lands slower than a trainer(No joke!). You'll be at least 1/2 to 3/4 of a pound heavier than mine with the YS, but I'm sure it will still fly very light.

Just something to think about.

Chris
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Old 08-12-2007, 10:39 PM
  #92  
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Default RE: 69" QQ Yak-54

Hey Reza,

Thanks for your response.

I just did some checking, and the muffler that comes with the OS 1.20AX adds almost 8 oz, so I gain a little by using the Slimline. I'm guessing that with this the OS advantage drops to about 6 oz or so, maybe less. How about options to move the battery around? Being able to mount the tank close to the CG is a big advantage with the YS though, something I wouldn't want to give up. How about placing the tank on top of the wing tube? The pressure system on the YS makes it pretty insensitive to tank position. Also, what about the Yak 73"? would that be a better fit for the YS 120 AC? This motor is so strong, and so reliable, that I just hate giving it up.
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Old 08-12-2007, 10:48 PM
  #93  
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Default RE: 69" QQ Yak-54

If you use 5 cell NIMH I think you should balance fine! It would be really difficult to balance with light weight 2 cell Li-Ion. I think your engine would be better if used in 69" rather than 73". How much vibration does that engine have? Is it like FZ or more like the DZ? If it is a shaker then I would think about soft mount as well.

I think you can do it, go for it! but remember it will require you to do some more work and be a little more patient as you need to start shifting things around to fit your engine and balance.

Talk to you soon,
Reza
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Old 08-13-2007, 12:29 AM
  #94  
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Default RE: 69" QQ Yak-54

cje0114 ,

If yours came in at 8.2 lbs, then mine with the YS 120 should be somewhere in the neighborhood of 9 lbs. That's still 1.5 lbs lighter than what I'm flying now, and only 22 oz/ft^2 versus 28 oz/ft^2 wing loading, definitely a big improvement.

Reza,

Unfortunately I don't have any direct experience with either the FZ,or the DZ as far as vibration is concerned, but the YS 120 AC can definitely shake an airframe up if all the stiffnesses, and masses are aligned. Usually I fly this motor in a pattern plane with a soft mount, and there's no problem at all, but right now it's hard mounted in a built up Goldberg Sukhoi, and in this airframe the motor will resonate with the airframe at about half throttle, but it smoothes out at max throttle, so most of the time the vibration isn't much worse than a light buzz. I'm hoping that the Yak 69 " will behave similarly, because I'm not enamored with the idea of replacing the light plastic engine mounts that come with the Yak, with a heavy soft mount.

How did you guys design a plane that's 2lbs lighter than the Goldberg Sukhoi, with 10% more wing area? Structurally, is the Yak 69" similar to the Goldberg Sukhoi? I notice in the online manual that there are lots of big holes in the structure around the engine mount. Is this structure going to be strong enough in the presence of engine vibration.
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Old 08-13-2007, 09:42 PM
  #95  
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Default RE: 69" QQ Yak-54

Chris i am building this plane with the fromeco batteries and reg. Could you please post some pictures of the inside of your plane and tell us what you moved to make it balance and where are you balancing the cg at?
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Old 08-13-2007, 10:06 PM
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Default RE: 69" QQ Yak-54

Reza,

Can you tell me what the landing gear, axles, and wheels weigh, and do you think it would be practical to try and find a carbon fiber landing gear strut to replace the glass-epoxy strut that comes with the Yak 69"? Central hobbies has a carbon fiber landing gear strut that weighs 3.2 ozs, and they also have aluminum axles that weigh 2 grams each. How much would these save over what comes standard?
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Old 08-13-2007, 10:56 PM
  #97  
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Default RE: 69" QQ Yak-54

Hi Brenner,

I would not suggest an alternative gear. Stock gear is very light and strong!

On the design question, plane is Somenized (TM). Quique's design. Plane is very strong for any 3D regime flying but won't take abuse on the ground! Keeping Vibration low is very important. Remember it is a very light plane and designed around OS 1.20 and YS 1.10. Those engines are very good with respect to vibration. After you build your plane you can justify if it's OK not to use the softmount. I don't really know until I see same engine on the plane.

Reza
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Old 08-13-2007, 11:14 PM
  #98  
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Default RE: 69" QQ Yak-54

Thanks Reza,

I'll call you tomorrow and order a plane. I'll try first with the YS 120 AC and then if that doesn't work, I'll get a YS 110 to put in it. I assume either the YS 110 FZ, or the YS 110 FZ S will work.
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Old 08-13-2007, 11:33 PM
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Default RE: 69" QQ Yak-54

Reza,

One other question if I may. What does "Somenized (TM)" mean?
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Old 08-13-2007, 11:53 PM
  #100  
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Default RE: 69" QQ Yak-54

Means plane has been designed and modified by Quique Somenzini to give you the best of both world, 3D and Precision!
Quique is an outstanding designer and designs each and every plane for perfection in performance!
He's airframes are light and yet very strong for any kind of flying!

Quique is a world class pilot who does not want to design an airplane that you and I won't be happy with its performance. One thing that always has amazed me, is his small planes such as this very 69" flies just as good as his 102". Check out my website www.RCModelAviator.com for some videos. I will be adding more videos of the 69" with YS 1.10 and Electric set up as soon as I finish the bigger project I am working on.

Thank you for your question,
Reza
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