RE: QQ 85" Yak

RE: QQ 85" Yak
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RE: QQ 85" Yak - 9/23/2005 7:12 PM

Quique Somenzini

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Hi everyone,
I also would like to thank you all for sharing with all of us your experience with our QQ Yak54 85". The final weight with the DA50, Duralite 4,000 for rx and 2,000 for ignition and Pitts style muffler should around 15.5lbs. I have not switch yet on my own 85" but with the 3W50 it weights 16.6 lbs. The difference of weight between the 3W and DA is 18oz. I just moved to Springfield Ohio now Wayne and I are only 5 minutes apart and we can work a lot better and faster than before. At the present I am preparing for Tucson Shoot Out so my time it is limited, but after that I will install the DA50 on my 85" and share with you my experience about balancing the airplane etc.
We have more 85" on water coming. If some of you are interested please write to Wayne Ulery at wulery@woh.rr.com so he can put your name down in our list. Once again thank you.
Quique's Aircraft Co.
Quique Somenzini
President
www.somenzini.com

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RE: QQ 85" Yak - 9/23/2005 9:21 PM

Ted5660

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Quique

Thank you for such a lovely kit--beautiful design. I am thoroughly enjoying the assembly. Could I ask you for your opinion on using a 2 bladed prop vs a 3 bladed prop. Which would you prefer to fly with on this design? Your time and consideration is greatly appreciated. Best wishes for success at the Tucson Shoot Out.

Ted

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RE: QQ 85" Yak - 9/23/2005 11:57 PM

Quique Somenzini

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Ted,
Thank you for your nice comments. On my own 85" I think a 22x8, 22x10 or 23x8 will be good for a 50cc engine. When we fly 3 blade prop in 99.9% of the case is because the noise. 3 blade props are quieter because they use less diameter so prop tip travels slower reducing the noise. 2 Blade prop increase diameter increase the pulling and increase the noise. In the case of a 50cc engine the difference of noise still existing between 2 or 3 blades but it is not such a big difference like the 150cc class for example. Saying that I will say in this airplane class (50cc) I will always prefer 2 blade prop because they have more power and the noise still good.
Quique's Aircraft Co.
Quique Somenzini
President
www.somenzini.com

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RE: QQ 85" Yak - 9/24/2005 1:27 AM

Ted5660

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Quique- Thank you for your comments, and taking the time to reply.

Ted

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RE: QQ 85" Yak - 9/24/2005 8:59 PM

splais

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I am having a problem with the engine template for the DA50. Basically it is uselass. It does not fit the firewall and doesn't snap into anything as the instructions state. The angle stock around the firewall prevent the plate from fitting flat and it also moves back and forth about a 1/2". Am I missing something or did the rest of you have a problem also. I know I can mount the engine without it; but it is there and I was looking for the easy way to do it.

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RE: QQ 85" Yak - 9/24/2005 9:36 PM

HardDeck

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Hello all

Couple of comments and questions

1. Wooden standoffs and DA 50: I would trial fit the cowl carefully before finalizing the engine install - as I could not get the cowl to fit (length wise) with full wooden standoffs plus the standard 2.5 in aluminum DA standoff. I cut the wooden standoffs to 3/8 inch (thickness) and then found good fit (still with engine aligning at front limits of cowl). Balance still seems fine re QQ flight manual recommendations. I note from pics on this thread that others have done the same.
2. Be sure to clamp the landing gear or otherwise take care if your are going to drill the composite landing gear to accept axles - as I managed to split the gear when the drill bit bound up in the material. I think I will drill small hole and enlarge with router to avoid this with new gear.

Questions:
1. The cowl is nice and light, but I am thinking fuel dot in cowl will be problem - wondering what others are doing for fuel point?
2. Can we cut into the fuse foam and sheeting (to install JR switch / charger) without compromising integrity of fuse?
3. I am thinking about running small piano wire to front of engine (within cowl cut out) to act as manual coke lever - this so save weight and keep it simple .... not done this before - thoughts?

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RE: QQ 85" Yak - 9/24/2005 11:27 PM

Ted5660

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I had to shave off about 1/32 on either side of the top and bottom of the template and then slightly chamfer the back edge of the template. It then fit snuggly up and down. I then centered the gap between the template and the side of the engine supports and drilled the holes. The gap left to right was about 1/16" either side.

Ted

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RE: QQ 85" Yak - 9/24/2005 11:32 PM

jlkonn

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I have been out of the hobby for nearly 20 years and I can tell you I think this Quique guy is very impressive.
I also am very impressed with the looks and performance of his Yak-54's.
I'm glad I came back!
JLK

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RE: QQ 85" Yak - 9/24/2005 11:34 PM

SpaceW

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hello!
Could we have a better flight report? ( the former report was interesting but only deals with precision flight, so now it will be fun to know how the plane perform in 3d)
Could we have a vid of this plane?

Thanks!
Bye
SpaceW

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RE: QQ 85" Yak - 9/25/2005 12:54 AM

RCAddiction

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Well, I cannot give anyone a full flight report today, as we only got in a few short maiden flights today, prior to the rain starting

The 2nd and 3rd flights were mostly to dial in the new DA50. It was running a bit rich and blubbering a bit as it was winding up slowly on the first tank. Idle was rock solid like my other DA. I like to build and I like to fly...I just don't have the time or inclination to do videos. Maybe someone else likes to do that stuff. For what it's worth, I didn't buy mine for 3D as much as for IMAC precision aerobatics.

The plane flies incredibly well. Visibility in the horrible cloudy sky was pretty decent, like all QQ Yaks. We only flew on low rates today, not 3D rates. My CG is approx 7-3/8-7-1/4" ahead of the trailing edge. 7-3/8" is recommended in the flight manual. It is very, very neutral with little or no coupling detected in the firs flights. I don't use as much expo as QQ does, and it is just as well. I used 7/8" low rate elevator, with 45% expo. QQ recommends 5/8" throw with much more expo. I need to reduce the expo a little further. He also recommends 2-1/2" aileron for low rates, and that's slightly hot. I may take it down to 2 or 2-1/4" for low rate (high rate is 3" ). It tracks precisely in large loops, snaps beautifully, and slows nicely on downlines. I'm running the MSC 22x8 which is very wide, and is probably contributing to the nice downlines. Landing requires a little bit of power, as it will slow down pretty quickly if you back off to a very low idle. Mine doesn't float forever, but settles in very nicely and predictably. which I prefer.

A couple of photos. The J&A pitts muffler actually sounds fine. I don't think it's a whole lot noiser, or much different than the Slimline on my other DA50 plane.

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< Message edited by RCAddiction -- 9/25/2005 4:45 AM >

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RE: QQ 85" Yak - 9/25/2005 1:05 AM

RCAddiction

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Some photos showing the RCATS ignition kill switch, battery indicator for ignition (Great Planes) and the Radio South digital battery indicator for the twin RX batteries as well as the RX charge switches.

JR Charge/Switch - this is what I normally use, but due to the incredibly thick foam, I decided to mount the 3 switches internally and use pullrods with wheel collars on them. I used an Ernst charge receptacle for each, CA'd the thin balsa a little bit, and used really long 2-56 screws to secure them thru the fuselage. I also put some CA on the housing before I shoved it into the cutout.

Fuel dot - I used the 1/3 turn Madison Components fuel dot mounted to the cowl, close to one of the cowl mounting tabs for support. With this fuel dot, you don't have to push it in hard or fight to pull it to take it out. It's got a 1/3 turn thread and comes out with a twist of the knurled knob. Much better than the usual fuel dots you have to grab with your fingernails.

Choke - I used a servo. I needed the weight up front anyhow.

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< Message edited by RCAddiction -- 9/25/2005 7:53 PM >

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RE: QQ 85" Yak - 9/25/2005 3:19 AM

mxcop114

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Hey Spacew,
I have been saying that I will have a video up and just have not been able to get it done. Hopefully in the morning the guy will show up. I have been flying much more 3D with it and it performs very well. Very little wing rock, does not seem to snap out of anything, very very good knife edge with very little coupling, very nice flat spins both upright and inverted. I have the EF 68" and this planes flys better than that, I just have to get used to the bigger plane. It hovers so well, I have already touched the tail several times. My settings are different than QQ's, I tried his and was not comfortable with them. I run more expo in some areas than he does, yet less in other areas. Same goes for surface throw, everyone has their own comfort zone I guess. I am also going further back with the cg. I will post all my settings soon, along with the new cg position.

Lee

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RE: QQ 85" Yak - 9/25/2005 4:33 AM

splais

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Guys, my plane has a little bag with 5 screws, nylock nuts and flat washers. Screws look like maybe 3mm x 1". Does anyone know what they are for. can't figure it out for the life of me. thanks.

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RE: QQ 85" Yak - 9/25/2005 4:49 AM

RCAddiction

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After eliminating everything else, I had come to the conclusion that those little screws and locknuts you are referring to are supposed to secure the landing gear to the fuselage. However, they were smaller than the size stated in the manual, and frankly too small for this plane, in my opinion. I mounted it with 6-32's and nylocs using the drill spacing shown in the manual.

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RE: QQ 85" Yak - 9/25/2005 9:57 AM

SpaceW

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ok thanks!

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RE: QQ 85" Yak - 9/25/2005 2:49 PM

HardDeck

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Thanks Lee for you response and pics re my questions.

RJM

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RE: QQ 85" Yak - 9/25/2005 3:30 PM

splais

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Well they definitely are too small for the gear. Plus there are only five and no blind nuts. After drilling the stated gear holes in the size recommended I ended up using 5mm bolts with nylock nuts on all six bolts.

After assemblying two 102" Yaks, I'm somewhat disappointed in the 85's assembly. The assembly manual was missing. My horizontal stab is way off and is requiring sanding and shimming to get level. The wing tube is too tight and required sanding. The DA50engine template didn't fit. And the little positioning pin at the top rear of the canopy is not positioned correctly and is useless. All somewhat minor things, but they do add up to substanially longer assembly time than the 102"

On the plus side, my 85 canopy is much clearer than the 102". Nice because I'm using a Virtual Cockpit on her. And basically everything else seems to be fine and I've found no bad glue joints or broken ribs/stringers.

< Message edited by splais -- 9/25/2005 6:47 PM >

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RE: QQ 85" Yak - 9/25/2005 5:22 PM

Bob J

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Splais,
Where did you get the virtual cockpit in the appropriate scale for the 85" Yak? I'm considering closing off the canopy to conceal all the framework below without adding too much weight. What did you use?.
Bob

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RE: QQ 85" Yak - 9/25/2005 6:13 PM

jrjohn

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nice looking plane, I'm going to follow this thread. I have the EF 87" Yak. If the QQ Yak is anything like my EF. you guys will have one heck of a plane!

john

< Message edited by jrjohn -- 9/25/2005 6:15 PM >

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RE: QQ 85" Yak - 9/25/2005 6:56 PM

splais

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BobJ.

It's sold by a guy named Kregg Wright at www.wrightrc.com. I have one on my 102" Yak and it's awesome, also weighs proactically nothing if you combine it with an Aircraft International foamy pilot head as pictured.

One GIANT CAUTION: After reading Harddeck's post I was being very careful with the gear. I still managed to crack it drilling the axle hole. this is definitely a weak spot that you must watch carefully. Now I am going to have to order a replacement and try to match up the mounting holes.

I don't want anyone to read any of my problems and get the wrong idea. I purchased this kit NIB from someone else and I assume it is one of the very first released. You must expect some problems. the plane is beautiful in all respects. I am alittle tee'd off about the gear though for sure.

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RE: QQ 85" Yak - 9/25/2005 7:19 PM

bbuzzone

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Splais - you're not the only one who split the gear when trying to drill the holes for the axel...

and I did have pilot holes drilled. Wayne got a replacement set to me quickly and the second attempt faired much better - held it much tighter on the drill press and drilled much slower.

I'm also running a Virtual cockpit in my 30% TOC Yak. It's fantastic, but will probably forgo building one for this plane as I'm trying to get it as light as feasible.

Nearing completion and should be able to maiden either Monday or Tuesday. Need to hurry - the wife does not understand my prioritizing this over job hunting!

Buzz

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RE: QQ 85" Yak - 9/25/2005 8:49 PM

jrjohn

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I noticed earlier in this thread there was some talk about the EF Yak wingspan being 87" and the QQ Yak 85" Talk about wing loading, wing area ect....

FYI I just measured my EF Yak 54, and the wing span is exactly, and I mean exactly 85 1/16 inches. Not the advertized 87 inches. I guess it's possible the wing area of 1450 on the EF might be off as well.

Whatever the case, it flys great, I bet the QQ is going to be a sweet plane just the same. Sure would like some reports of all up weight and what equipment was used. And of course some 3D flight reports!

John

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RE: QQ 85" Yak - 9/25/2005 9:16 PM

bpryor

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quote:

ORIGINAL: jrjohn

FYI I just measured my EF Yak 54, and the wing span is exactly, and I mean exactly 85 1/16 inches. Not the advertized 87 inches. I guess it's possible the wing area of 1450 on the EF might be off as well.

Hi John,

I'd been trying to get someone to measure a EF to see the reality. I suspected it was only 85" because I have the KMP(same design as EF), which I posted earlier either here, or on the BME thread, that it is also advertised as 87" and 1450 sq in, and in reality is 85" and 1366 sq in. As you said, it doesn't matter to me much because the plane flies superbly, but I don't think there's any excuse for being that far off either. Kudos to Somenzini for being honest with their numbers.

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RE: QQ 85" Yak - 9/25/2005 9:32 PM

jrjohn

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Bill, I don't think anybody was trying to be dishonest, The mistake Probably has something to do with the fact that the wing recesses into the fus. Oddly enough if you pull the wing out of the Fus so the trailing edge is flush with the fus and measure the wing, it is then exactly 87 inches. I'm guessing the wing was not measured on an assembled plane, but rather somebody took the wing length times two, and added in the with of the fus at the trailing edge of wing. OOPS!

Kudos to QQ for paying attention in math class!

john

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RE: QQ 85" Yak - 9/25/2005 10:07 PM

bpryor

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quote:

ORIGINAL: jrjohn

Bill, I don't think anybody was trying to be dishonest, The mistake Probably has something to do with the fact that the wing recesses into the fus. Oddly enough if you pull the wing out of the Fus so the trailing edge is flush with the fus and measure the wing, it is then exactly 87 inches. I'm guessing the wing was not measured on an assembled plane, but rather somebody took the wing length times two, and added in the with of the fus at the trailing edge of wing. OOPS!

Hi John,

You may be right, but the Web is a fluid medium, so there's really no excuse for not updating the info on at least their Web site when they found out there was an error. Funny that EF, BME, KMP and TOC all made the same "measuring mistake".

< Message edited by bpryor -- 9/25/2005 10:09 PM >

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