marmitas

My Feedback: (1)

I have to say- The landing feel came as a total surprise to me.
I have flown the plane now in a variety of wind conditions (cross wind/ and straight down the pipe)....and the airplane remains very predictable...after it is lined up and the angle of attack is set....the plane flies down with throttle very gently.
The feel may change depending on the prop used...and the wing loading of course.
You will like it...get one!

marmitas

My Feedback: (1)

oops! double posting

RICK9303

My Feedback: (172)

Just a note for those who are putting in gas engines in the YAK. Before you put the rudder servo in the tail, balance the plane with the servo and push rod taped in location to side of fuse. You may also want to tape a servo extension to side, as if it were in location. You may find as I did, that you are tail heavy. If you are, now put it in the pull-pull position, and remove servo extension. You may have to put the battery up by the gas tank.Don't forget to put the long pull-pull servo are on. I installed my rudder servo in the tail, thinking that my DA50, pitts muffler, and ignition would be plenty to make it nose heavy I contacted one of the guy here, that posted he had put in the DA50 in his and was using pull-pull. This might save some one from cutting out the hole in the tail, putting in the servo extension. Mine now balances pretty close to thr 5 and 1/8 in dimension, the manual gives. Possibly a Fugi 43 or 50, woulc be all right, with the rudder servo in the tail. Using a trial setup you can easily find this out. Hope this helps anyone with a gas engine setup.

Rick

davegr1

My Feedback: (2)

I have the DA50, I placed the rudder servo in the pull-pull. I perfer them tail heavy, so my receiver and rec batt are in the spare tray aft of the servo. Im using the JR8611a for rudder. Hitec everywhere else. Flys great. I balanced out to 6". 23x8 xoar prop.

evfast

My Feedback: (31)

Rick

Let us know how she flies.

later

pensacola

ey marmitas.

I bought the yak 54 too. my question about it is the next one. will the yak make a torque roll with the os 160 fx. and the silence mufler.
I like 3d very much. so I want to make some hovering maneurvres and torque rolls.

thanks.

greetings john van gastel

RICK9303

My Feedback: (172)

Just a update to those who where thinking about a DA50 in the Yak54. After a week and a half delay I finally got out last night to test fly the Yak, with a DA50 installed. After getting every thing togather and doing a recheck of engine, I fired her up. I just got back my DA50 from repair and with a new carb, it needed to be reset. I'm running a Mejzlik 22-10 on it . Take off was no problem, with just a few clicks of up, it was flying level. Had to land, to lean out a bit the motor, retook off, better. Good verticle, nice roll rate. Clouds were rolling in, and with a rain storm coming, I decided to land. Landing was very smooth, even at about 14.5 lbs, it was very steady. The prop is not letting it spool up as fast as i wanted. I'm going to try a 3 blade 21 - 11.5n, which is a recomended 3 blade. I didn't get a real chance to wring it out yet, but so far, what I've seen, is good. I will hopefully be flying it this week end and will report back, about the 3 blade prop.

marmitas

My Feedback: (1)

John,
The OS 1.6 is new and has only 4 liters of fuel running time. Because it is a ringed engine it is running rich until the break-in is completed. However, the airplane climbs with no problem at 3/4 throttle and hovers at 1/2 throttle. After a few more flights I plan to lean the mixture and expect to gain about 500 RPM. Which means that it will hover even better. By the way I'm using a Bisson Pitts style muffler.

The MacDaddy

My Feedback: (10)

Rick,

Thanks for the rudder pull pull, I would have thought the rear mount was a must. I have a DA50 on the way, and considered the 3 blade for clearance and scale appearance, let us know.

Mac

swasey1982

Marmitas, how´s your balance setup, just like the manual states? cause i have the same config you have, but seems she is a bit tailheavy, and her current weight is 14 pounds unbalanced, it seems i need 16oz in the nose, the bat is infront of the fuel tank.

Thanks.

"" just finished balancing her, 14.6 pounds on the scale, really makes me think i should get a DA50..""

! COMMENTS PLEASE ![&o]

marmitas

My Feedback: (1)

The battery is located at the "engine box".
I have a 3700 Nimh 5 cell pack there.
The CG is 10mm behind whatever the recomended CG is.
Hope this helps.

swasey1982

Hey marmitas, thanks fot the info, i balanced it 5 mm back from the c.g gp recommends, 10mm you say? how does she handle ?

Thanks.

Richard

marmitas

My Feedback: (1)

Very neutral.
Lands very slowly.
Have fun!

RICK9303

My Feedback: (172)

Just a short follow up on DA50 install. Flew the Yak Sunday again, very windy. Was getting 6400 rpms on a 22-10 Mejzlik. Switched to a 21-11.5N 3 blade. RPM drop to 6000 and flew very well. It was so gusty, that it was hard to due anything with it. I do believe if you are going with gas and using a 21-23 dia. prop, you will have to be careful on landings, not to bounce, or you might hit the prop. Even in the wind, it landed very well. I'm running 4 in dubro lite tires, to get as much ground clearance.
Rick

airborneSGT

My Feedback: (15)

A new DA 50 you should be running something like a 22x8. The NX, Bolly or Menz are great props for break in. Spool up is fast and that setup on a DA 50 hovers a 17lb plane no problems. PT models makes a good composite prop if you want one.

Save the Zinger for mixing paint.

marmitas

My Feedback: (1)

Oh boy, Joe Zingali will not like that LOL

Snakebit

I'm just finishing the YAK 54, using a Fuji 43. I relied on the manual and put the rudder servos in the rear, the throttle servo in the pull-pull mount, etc. It came out extremely tail heavy, so I decided to move everything to the front. I now have the rudder servos in the pull-pull location, the receiver and throttle servo in the front mount and the ignition/receiver batteries in the engine box. I'm using an 1800 mah, 4 cell nicad pack for the receiver and a 1500 mah, 4 cell nicad pack for the ignition. I still need about 22 oz. of lead to get a balance at the 5 1/8" location recommended.

I appreciate some of the previous postings saying the aircraft will fly well with the balance point moved aft as much as 7/8". I think I'll try setting it up at the point 10mm back from the recommended setting in order to decrease the dead weight necessary.

I did comment to Great Planes about the discrepancy in the manual's recommendations. They said the Fuji 43 is lighter than many of the engines that could have been used, which exacerbated my problem. Strange that they used the Fuji 43 as an ideal engine to use, in the manual.

Has anyone experienced radio interference problems with the Fuji? The plug wire isn't shielded like the DA 50, etc. Maybe I can't even put the receiver battery that far forward... Every other receiver component is located to the rear. I'd appreciate anybody's ideas on this. I haven't tried an engine running range check yet.

Hasti

Snakebit, Whatever you do...do not add weight. My yak with fuji 43 is 15 1/4 lbs with no added weight, in my opinion already too heavy for wing span. Balance is 5 3/8 back fro leading edge (will come back further soon). In my limited experience (12 flights) it likes to land fast with this CG setting. I have single Hitec 5955 in tail for rudder, 2700 NiMH just in front of wing tube, 1600NiMH and ignition module on a 1/4 ply shelf which sits 2" behind spinner back plate (mounted with zip ties to ply engine box).

The Rx battery is nearest to ignition kill switch (approx 9") and have had no interference problems so far (100+ feet at full throttle collapsed Tx antenna). I'm running new JR 790 Rx. Personally, I would air on the side of caution...move ignition etc further forward rather than move Rx gear closer to front

The MacDaddy

My Feedback: (10)

DA 50 users, what size standoffs are you using and are you cutting a hole in the firewall for the 1" clearance to the carb body?

Mac

xtdsm

I think most people are running 3" stand offs (including me) and even with that, the plane will be a bit tail heavy if you don't mount things as far further toward the front as you can.

The MacDaddy

My Feedback: (10)

What about the carb hole? I was going to try to avoid it.

Mac

xtdsm

you might get away without any, but I did anyway, I felt it would make the carb breath better.

Machinegun21

Hey marmitas, how well did the Yak fly with the 1.60?

marmitas

My Feedback: (1)

The OS 1.60 is a perfect match for this airplane. I use 20/20 fuel and I'm still running a bit on the rich side but there is no problem with vertical maneuvers and it hovers at around 1/2 throttle. The video shown in the Great Planes website was shot with an OS 1.60 and, based on my own experience, I would say it is very realistic. If you need to buy an engine I would recommend the 1.60. The performance is great. And the installation is very straight forward compared with installing a gasser (see that previous postings by some guys installing DA50s)

Machinegun21

Sound good, when i get mine i will prob put a 1.60 on it. can the 1.60 on the yak do full 3d?