View Full Version : Yak 54 from Tech One

03-26-2012, 09:46:42 PM
My son and I each bought one of these. (Xander used his own money to buy his, including the electronics). We just got it and all of the equipment. Looks like it will be an easy build. $59 for the foam, great deal. The carbon fiber is already installed, and everything looks great.

1100 mm EPP Tech One Yak 54 (http://www.nitroplanes.com/02a-008-1100mm-yak54-3d-epp-kit.html)

The ARF version comes with an AT2216 1250kv motor, which according to my research, weighs 68 grams and a max current of 40 amps for 15 seconds.

But we bought the kit, and selected the components on our own (going for cheap).

I selected, on the fly, the Exceed RC 2210 1360KV (http://www.hobbypartz.com/86ma58-2210-1360kv.html) motor, which weighs in at 50 g (specifications). It has a maximum current of 28 amps for 350 watts on 3S fully charged. It might be a little under powered for this size plane, even if it is foam.

For the servos, we will use EXI S1123 9G Micro Servo (http://www.hobbypartz.com/9gmiseexis1.html). 1.4 kg/cm at 4.8 volts. At $2.88 per servo, we hope they work.

For the rudder and/or elevator, we may use some Turnigy MG90S (TGY-90S) servos (http://www.hobbyking.com/hobbyking/store/__9392__Turnigy_MG90S_Metal_Gear_Servo_1_8kg_13_4g _0_10sec.html) that I have, if you guys recommend these instead. These have 1.8kg/cm at 4.8 volts.

For the ESC, we're going with Dynam Detrum 30A ESC with 3A BEC (http://www.hobbypartz.com/60p-dye-1003-30a-esc.html). 23 grams. I have some other 40 amp ESCs if necessary.

Plane: $59.00
Motor: $13.55
Servos: $11.52 ($2.88 *4)
ESC: $11.70
Orange Receiver: $5.99
Misc extension: $5.00 (est.)
Prop: $3.00 (est.)
1300 mah battery: $9.70
Total: ~$115

The ARF, which is out of stock, came to $119, which didn't include the receiver or battery, so if the motor and servos work out, we'll be doing okay by going the kit route.

I hope to Xander's built first. Looks like it will go together in about 2 hours (for me, I'm slow).

03-31-2012, 05:06:26 PM
I built up Xander's plane.




The AA battery was on to get the COG per the manual, but Xander flies it without the battery. The manual's recommended COG is probably more nose heavy than it needs.

Videos coming...

BTW, I sold my Yak 54 for about cost to Jim. He was very impressed by it, and I have two other planes to build, so it was a win/win situation.

03-31-2012, 05:17:50 PM
Build and flight notes: We switch the elevator/rudder servo locations from the manual, because the control rod for the rudder would not have made it otherwise. (Either that, or I misread the manual.) We also added a satellite extension to the orange receiver. Xander flies on 1300 mah batteries right now, and after 5 minutes, was using about 1200 mah worth of juice. So he has shortened the flights to 4 minutes, and is considering buying different batteries for longer flight times. We used clear caulk to attach the wings to the fuse. The foam safe super glue works okay, but the kicker doesn't mix well with the paint. I used epoxy to attach the rudder to the vertical stabilizer.

Xander's notes on how it flies:

The plane flies slow, but it is easy to do 3d. It does high alpha and hovers nicely. I havenít tried any KE or flat spins yet. I set it up with 50% expo on the rudder, ailerons, and elevator. The roll rate is a bit too slow, but otherwise you have a lot of control authority. I recommend this plane because it is inexpensive and much bigger than a UMX plane (which are also fun).

03-31-2012, 05:30:51 PM
that is a sweet looking plane. i really dig the paint scheme! is that your design?


03-31-2012, 06:35:16 PM
It does look airbrushed, but I'm not artistic enough for that. This is how they come painted. Thanks for the comment.

04-01-2012, 04:22:37 PM
Here is a video we put together...head mounted camera


04-01-2012, 05:11:09 PM
Here's another one, again, flown by Xander.


04-01-2012, 06:41:56 PM
looks like xander could give dad a run for his money.

cool videos guys. thanks for sharing.

04-01-2012, 07:08:28 PM
On the sim he is much better than I am. In real life, this is the biggest plane he has flown by himself, and he's still a little nervous, probably because he bought the plane and electronics...but I am sure he'll be ready for the 48" EF extra 300 he got for Christmas soon enough (as soon as I build it, but I am building mine first.)

04-05-2012, 08:04:56 AM
From Wednesday evening. He flew 3 batteries, but I only videod about 1.5 of them.


04-05-2012, 07:18:55 PM
Don't eat for 45 minutes before watching this video. Xander flying. I don't think he knows the meaning of flying a pattern.


04-11-2012, 06:08:00 PM
The wind was very light today (2-4 mph), and we went out to fly. Xander tried both the 11x4.7, and the 10x4.7, both slow fliers, on his Yak 54. Both got the 2210-1360KV 180 Watt motor hotter than the normal APC 10x5. I guess this is because the 10x4.7 is wider, and the motor doesn't get as much airflow. Even with the 10x5, I'm guessing the motor is getting more than the 180 watts it's rated for.

Even so, we had fun, and Xander was hovering and torque rolling pretty low today, and also did some great knife edges.

He let me try his plane, and the rolling harriers are a bit squirrely. Not sure if I need to dial back the rudder and elevator, add more expo (we only added 50%), or something else like aileron differential.

04-11-2012, 08:36:36 PM
Short clip of Xander flying today...