I only have a Peak 26cc engine on mine, which is lighter than yours. You also used two "C" 4.8V packs Where did you mount the batteries. If I remember the cg on mine was 7-8 inchs from the leading edge near the fuse, it was aft the wing tube if I remember correctly. I sense from other posts if the cg is on the wing tube all will be well, do you agree?
Thanks

Scrafe and others:

I finally got mine in yesterday! ChinaKote, Yuk! But that is what I was expecting for what I paid. I think it would be a great plane to recover in ultracote (and check the glue joints while I have it open) but I am probably not that motivated. My cowl seems nicer quality than what I have read, fairly thick and doesn't seem too brittle. The cowling does have a crease in it from shipping, but I think I can fix it with a heat gun. I hope you don't mind, but I have a couple more questions for you.

I really like how you did your landing gear, I may have to try that trick on mine or use a different gear. How do you bend the music wire, and is it one piece or two?

Did you use pull-pull on your rudder? I do not see a servo in the tray under the canopy. I am also considering push-rods to move the elevator servos out of the tail for balance reasons, or maybe even use a MK style elevator bell crank: http://www.centralhobbies.com/contro.../Bellcrnk.html

I am thinking about the SPE 40cc gas engine, but I think it may be too much weight ( a full pound or so more than the 1.60FX) for the wing area. I have a CMP Giles 202 and the wings are almost the same size and I'm flying it with a Saito 1.80 and I don't know that it would tolerate another pound and keep it's good flying qualities. This would be an easy way out for the balance issues, but I also like good flying planes.

The other engine I am considering is a Moki 1.80-2.10. That would split the difference weight wise. I have never owned one though. I also don't think spacing the engine out an 1-1.5" would be too difficult with a GP mount, or even the heavier metal Dubro isolation mount to move some weight

I know I have asked a lot here, but since you have flown the plane, what are your opinions?


Kendall

look the video of engine and motor in rc universe and look for brillelli GT and Yak , this is the setup I got with a 40CC you need the extra weith in this airplane on the nose, this plane is tail heavy, and use a pull pull system on the rudder, the landing gear is from a great planes ultimate 1.6 and is only 14.00 dollars from towerhobbies and fit perfect you only have to relocate one blind nut on the gear and is composite, even the plane look scale. I use a hitec 805 for rudder because I fly 3D. the plane fly 3D fine with this setup, and super powerfull for Imac.

Could you please post a link? I have searched and cannot find it.

Thanks,
Kendall

I think this is the video he is talking about. Here you go............


http://media.putfile.com/Brillelli-40GT-and-Yak-54

yes that is the video.

I thought I would post a quick update. I bought this bellcrank to keep from installing servos into the tail:

http://www.unitedhobbies.com/UNITEDH...idProduct=4306


It has bearings and is very smooth. I'll post again when I make some progress.


Kendall

Can anyone tell me where they are purchasing this Will Hobby Yak. I checked thier web site, and I do not see a way to purchase one. In fact, I do not see a price on thier site.

Im in the market for a gasser, and I was thinking of getting the volux revolution II with a 26cc SPE for under ($450 shipped), then I stumbled across this plane, and it looks pretty good, but i cant figure out where to purchase.

Anyway......would appreciate some help.

Thanks,
Mike

I got one new in box and other that I crash because the engine quit, the engine box, landing gear box, and cowl got damage, but wings, stabs and elevator and canopy ok, you will get both of them new in box and use, for 300.00 and I live in columbus ohio, so you can pick up. look the airplane if you like you take if you don't then is ok, I got too many planes, the first yak fly like a dream, but you have to got true the whole airplane with CA and Iron the covering, standar procedure with a ARF. Let me know if you whant it.
I am in canal winchester 30 minutes from columbus international airport. 305 807 1215 Monty.

How much is this Airplane and where do you purchase one?

I will start building the second one, this one I will fit it with a crrcprogf45, the brillelli 40 was marginal for hovering and the airplane is a little be heavy, in the next one I will removed the covering in the fuselage, and in both side of the fuselage in the bottom of the turtle back I will do some lighting holes to light the plane. the plane is fully aerobatic, so i will not spect any problems,.
My first yak yak was a lot's of fun.
yes the chinacote is a piece of @#$^$#$%^& but I will deal with it later.
If you go with a gas engine i fully recomend to go over the aircraft with epoxy no CA, do not use the hinges (CA hinges) or you will do repairs after 25 flight or lose the plane, use pin hinges with expoxy, and use dubro hardware, the one that comes with the plane is garbage. Do a pull pull for the rudder is the best set up, i use a hitec 805, and 2 swithches for the batteries of the receiver, pay attetion, one swith goes with a Y harnes to the 1) Battery, conected to the on off swith, from the switch to the Y harness , from the Y harness one for the servo and one for the receiver in channel 4. The second battery goes normal 2) Battery to switch on and off, swith to receiver in the battery slot. Now you will have a redundaci sistem, if one switch go bad the sencond battery will take control for you guiden system, there is no way you will lose the airplane because of battery or switch faliours. The servo hitec 805 come with a Y harness, the reason is because this servo draw a lot of amps, or that's what they say.
have your CG in the wing tube or at leats one inch in front of the wing tube.
you need a little heavy engine for this aircraft if you don't do any mod.
And don't forget to use the ultimate great planes 1.6 landing gear. looks scale and is stronger. I use a prop 18X8 and it was perfect for my 3D flight/. Use estrong servos like 645 hitec metal gear do not use nylon or you will regret the saving. Model this big need metal servos.Now you may get this plane true ebay like I did. I pay 200 plus shipping. I got a good relationship with the seller this is my 8 plane I buy from him. Any question please let me know. remember this are only sugestion of my experience any one can differ from my opinion. thanks. to all. Monty.(Maxun)
I can helped, I attach my current joy, my extra 330L at 16lbs is a mouster of plane 110 flight and counted more.
And now the last recomendation, the tail wheel i recomend Sullivan P/N 861 do not use the piece of l%$^%$ that comes with the plane. monty.

Well I just bought a Yak ( same exact specs ) but am not sure if it is a WillHobby yak.
Everything I can see, tells me it is a WillHobby, except for the color skeem.
I have a OS Max 1.20AX I was going to put in it, but after reading the weight issues you guys are having, maybe I will put my Brillelli 36GT gasser in it. The only thing is the wife just bought me a Great Planes Super Stearman that the Brillelli was for. Well I guess the OS will just go in the Stearman.
Here are some pictures of the Yak, see if you guys can tell me if it is a WillHobby one.
WillHobby Yak calls for a 1.06-1.08 2C or a 1.20 1.40 4C

yes, look like a wild hobby but better.

So, you think there is no way to balance this plane with a 1.20 two stoke other then adding weight ( lots of weight )?

this airplane will go with a 45cc gas engine like crrcpro perfect, will balance on the money, will be cheap in gas and you will have a blass.

Well, my plane came today and it is a WillHobby Yak 54. It has in the instructions for a pull pull rudder, CG is 130mm from leading edge at fuse which is right on top of the wing tube, a awsome new color sceem , and the landing gear seems plenty stong enough. So they must have made some changes. On the bad side, just throw the instructions and the hardware packsge in the trash. I did change the colors on the tail/rudder from the blue and white checkers to the picture below. Started building tonight and am going to use a OS Max 1.20AX. as I build I am going to keep as much as I can as far forward to keep up on the CG issues that I have read in this thread.

Well, there is no way to get a 1.20AX to even come close to balance. I put my Brillelli 36GT gasser in her. This will make her balance without adding any extra / dead weight. RTF dry weight is at 12lb. 14oz. could drop a little weight going with a wood prop, plastic spinner, one RX/servo battery instead of two and still get balanced by moving the batteries. I used Robart pin hinges and CA'ed every joint I could get to. Changed up to all 4-40 hardware and a Pull pull rudder. I am now putting on some color. I changed the tail ( did away with the blue and white checkers ) and made it blend with the plane more. Added some color to the bottom and am cutting from monokote some Yak 54 logos for on top of the wings.
OH, by the way, the wife just loves it when I lean the plane on the china cabinet.

2robinhood,
Where did you pick up the Yak. It looks very nice. What is the covering like. How much was it?

I got it from Harris and Anderson R/C and Hobbies in Spanish Lake, MO. He was selling the on E-bay and in the clasified here on RCU. I got it for $169.00 + $30.00 shipping.
Covering is China coat, but isn't bad at all. The monokote that I am cutting out and putting on top is going on and holding fine.
This is the same plane, just a different color sceem.
http://cgi.ebay.com/Yak-54-140-Nitro...QQcmdZViewItem

Here is Willhobby home page also.
http://www.willhobby.com/

2Robinhood,
Thankyou for the imfo, and the plane looks awesome. I just ordered a .90-1.20 YAK 54 QB from Aeroworks tonight instead. here is a link .

http://www.aero-works.net/store/detail.aspx?ID=288

The Aeroworks a great planes. The only thing I don't like about it is the $$$. It's $400.00 at the door. It's just pricey for a 1.20 size plane.
Thats what I paid for my 30% Richmodels Yak 54.

Well, I have it complete and ready for it's maiden.
Even with the 36cc gasser, ignition, ignition battery, throttle servo all mounted on the engine box ( and two RX batteries inside the engine box ) I stll had to add 9oz of lead to the nose.[>:][>:][>:][>:]
It came in at a porky 14lbs 3oz.[&o][:-][&o][:-][&o]
My 87" Yak with a DL-50 is only 2 1/2 lbs. more and that has a full smoke system.
Happy with the plane, but not happy with its weight.
It's not because of the gasser either. You would have to use dead weight to get a nitro motor to balance. The weight off the gasser helped, but still wasn't enough.

So how's that baby flew?
where did you put the CG at?

I might buy this plane next so week and put a Moki 210 engine on it which it's weight is 2.87 lbs.
how much did your 36cc gasser weighs?

Guy.

Well, between bad weather on the weekends and deer hunting it took 2 months to do the first flight.
It flew great. No aileron, or rudder trim, and three clicks of up elevator.
I have the controls set at the manual specs of 20 degress each surface. ( except the rudder, I always go with max rudder ).
Ailerons could be set more, but the 20 degrees is good and is a perfect starting point for anyone to customize.
I was alittle worried about the weight at 14 lb. 3 oz. tank empty ( 22 oz. tank ), but it flew and glided great.
Landings are slow and smooth, it will flare for a super smooth 3 point landing.
One issue that I am having is the landing gear / pivot point.
I have the CG set at perfect ballance ( tank empty ). I do all my planes at perfect balance, I never start out alittle nose heavy.
Well, I can't really taxi without it nosing over.
As soon as I touch any gas the tail lifts up and it want to nose over. Even with elevator on high rate at max deflection.
I am looking at having some custom made gear that will be taller, wider, and swept forward.
I am going taller because I need more prop.
The Brillelli 36GT ran A+++++.
The largest prop that I can run with the stock landing gear is 18"
I am running a APC 18 X 6W @ 8250 rpm.
Verticle was unlmited, but not fast and powerful.
I want to run a Xoar 19 X 8 and the verticle and punch out of a hoover should be much better.
No coupling on either left of right knife edge and just a touch of down for inverted flight.
Once I get the landing gear sorted out, I would say this is a great buy.
Wish it was lighter, but you don't notice the weight in the performance.
Definately a 35cc - 40cc gasoline plane though. There is no way I can see this fly with a 1.08 - 1.20 two stroke glow like they call for.
More forward swept and taller landing gear. 1 - 1 1/2 pounds lighter and this would go from a great, to a awsome plane.
Landing gear I am doing. As far as the weight, Maybe the elevator servos could be mounted under the canopy instead of the tail. This would make it so I could lose some of the 9 oz. of lead in the nose. Drop down to one RX battery and switch. The big thing is to get the tail lighter and not add any dead weight.
Hopefully my flying season will be as good as my hunting season.

I have this same yak and its very very tail heavy, I had to add 13oz of lead and bat, and ignition and its still tail heavy... I'm selling mine now... I had an spe 26cc engine on it and it flew like a warbird! It could do simple aerobatics but nothing I was into... I thought I was getting a deal on this combo but the weight I had to add just screwed it all up! this plane needs a Heavy 40cc to 45cc to make it perform the way its supposed to...