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Old Aug 25, 2012, 11:43 PM
certified crash instructor
Scottsdale Arizona
Joined Dec 2009
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The vox 12x6 pulled 737 watts @ 65 amps, very similar to the apc 12x6. The vox 13x5 pulled 842 watts @ 72 amps on a 3s lipo!
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Old Aug 26, 2012, 01:48 PM
smoke is my wattmeter
Longview, Tx
Joined May 2008
1,120 Posts
Swapped mine back to a 4s setup and lost an ounce of weight so it's down to 56 ounces. Motor is a 145 gram Infinite 3020 with a 12x6 and a lighter prop adapter than I was using and using Gens Ace 25c 2200. Pulls a tad over 700 watts with about a 90% battery. Motor came down barely warm this morning. Much better power than my 3s setup but my plane really isn't flying so great. It really wants to hunt around when I try and fly level. Elevator servo doesn't have any more gear play than usual and linkage is tight but the elevator itself I beleive may be my problem. Both sides aren't even and both are somewhat warped. It was a real handful trying to land so I kept moving the battery forward each flight and it helped some but not a lot. I've got other planes much easier to land and fly.
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Old Aug 26, 2012, 01:52 PM
smoke is my wattmeter
Longview, Tx
Joined May 2008
1,120 Posts
The plane balances without any extra weight, battery at the rear of the compartment. The missing pilot seems to counterbalance the slightly heavier motor.[/QUOTE]

I'm curious where yours is balancing? Maybe mine is off further than I realize.
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Old Aug 26, 2012, 02:40 PM
certified crash instructor
Scottsdale Arizona
Joined Dec 2009
2,212 Posts
Mine is balancing out at factory specs, 6" from trailing edge of wingtips. I have the battery all the way back, maybe half an inch forward at most. The vox prop, pa adapter and carbon fiber spinner are very light. I flew it this morning twice and it was perfect, plenty of power and torque on the vox 13x5. I like the 3s yak the most, I've always overshot the runway at my field, this one slows down enough I actually had room to spare.
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Old Aug 26, 2012, 07:06 PM
Play tetris with my english
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Puerto Rico, San Juan
Joined May 2008
2,151 Posts
Do I miss something? I know you guys are looking into a 3s setup for a light weight CZ. mine is all stock and i do a very good dead stick landing and is very stable at slow speed. I know she feel like a 3D brick when try to high alpha. But is a good solid setup for windy days and every day use.

So why not insted of buying all new gusts for the yak. You build another floaty one like mini funtana o 3dhs one. You can sped more or less $200 to make the yak 3s. When i want a slow flyer 3d i just pull out my epp yak and float all day around.
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Old Aug 26, 2012, 08:19 PM
certified crash instructor
Scottsdale Arizona
Joined Dec 2009
2,212 Posts
I liked the stock yak while it lasted, wasn't very long for my elevator servo to give up. I gave up on the yak after that but a year later I saw one flying and decided I rebuild it with better electronics, it came out heavy but powerful, not my style although it is fun. I like the yak but felt it was too heavy so the 3s yak began. I figured I could get stock power on a modified 3s setup and really bring the weight down, it doesn't feel so much like brick now. I'm really liking it!
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Old Aug 27, 2012, 07:06 AM
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Canada, AB, Calgary
Joined Jun 2011
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Not a new idea but I put a (red) sphere headed pin under each wing tip at the balance point per the manual so it's a cinch to check balance.
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Old Aug 27, 2012, 10:12 AM
Registered User
Joined Dec 2011
81 Posts
Has anyone tried the E-flight Power 25 1250kv motor, or simalor Kv motor in their YAK yet? If so what prop did you use?
TIA
Paul
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Old Aug 27, 2012, 10:40 AM
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Manning, AB, Canada
Joined Nov 2009
1,240 Posts
Depends what your after. Lower kv motors are generally better for 3d so unless your going for more speed and less torque not sure if that is best choice. I'm running 870 kv power 25 with 14x5. Good combo. If u stick with that motor go no more than 4 pitch prop for 3d and 6 for speed IMO.
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Old Aug 27, 2012, 12:11 PM
whiirrrrrr
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United States, TX, Houston
Joined Nov 2011
785 Posts
Well I flew my yak on the new setup with a hacker a40-10s motor. Took some modification to fit it, but it's great now. Ran it on a 13x4 and 13x6.5 prop. Terrible! Not enough speed or thrust. I guess I'm going to have to do the same as posted earlier, bend the gear for more clearance so I can run the recommended 14x7 prop. THAT should put me at a little over 900watts, and wayyyyy more thrust than the stock setup, or even the stock setup running a 13x4
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Old Aug 27, 2012, 01:10 PM
certified crash instructor
Scottsdale Arizona
Joined Dec 2009
2,212 Posts
Quote:
Originally Posted by paul45120 View Post
Has anyone tried the E-flight Power 25 1250kv motor, or simalor Kv motor in their YAK yet? If so what prop did you use?
TIA
Paul
The Kv is a bit high for 4s applications, more of a 3s motor. I run 3s on a hyperion 3020-8 (1135Kv) and it pulls around 730 watts on a 12x6, 840 watts on a 13x5. I think 4s would be too much for this motor. A 5s would wake up that hacker a-40 though!
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Old Aug 27, 2012, 04:17 PM
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Joined Dec 2011
81 Posts
You got to love foam

I just maidened the YAK again after putting it back together.
Had a hard crash last week. Broke the fuse in 4 pieces, ripped off a wing, severed the switch wires, and bent the motor shaft. Also bent the prop adapter but somehow didn't break the prop.
Glued and soldered everything back together again then straitened the shaft on my lathe.
The only thing I replaced was the prop adapter.
I put her in the air and she flew pretty good. A little tail heavy and needed a little trim. Moved the battery foreward a bit and she flew just fine.
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Old Aug 27, 2012, 04:21 PM
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Joined Sep 2011
668 Posts
@paul45120

Nice! A balsa plane with that much damage would be considered firewood!
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Old Aug 27, 2012, 04:38 PM
Play tetris with my english
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Puerto Rico, San Juan
Joined May 2008
2,151 Posts
That is the reason i like most the foamy.
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Old Aug 27, 2012, 07:20 PM
certified crash instructor
Scottsdale Arizona
Joined Dec 2009
2,212 Posts
Quote:
Originally Posted by jwiebe View Post
The Yak didn't pull out of a roll over the lake a couple weeks ago and entered the water at high speed, snapping the nose off and breaking it in three pieces. We have a rowboat at the club for rescues. Anyway, lots of white Gorilla glue later, it's back in one piece and I ran some numbers before taking it up tomorrow:

Hyperion 3025-8
Hitec HS-82MG (x4)
Zippy 4S 2800mAh 30C
Eflite 60A ESC (stock)

AUW: 4.00lb (64oz) (c.f. stock 3.75 - 3.81lb, about 5% heavier)

Prop ---- Amps -- Watts-- Thrust (lb)
12x6 ---- 62.3 ---- 860 ---- 5.8
12x8 ---- 70.1 ---- 944 ---- 5.3
13x4 ---- 55.4 ---- 780 ---- 6.3
13x6.5 -- 69.6 ---- 930 --- 6.9

All props are APC thin electrics. Static thrust measured with a fishing scale.

The plane balances without any extra weight, battery at the rear of the compartment. The missing pilot seems to counterbalance the slightly heavier motor.
I use a hyperion 2950mah 35c 4s with my hyperion 3025-8 and a vox 12x6 prop and it pulls around 1100 watts. You should try the hyperion lipos, they are pricey but I think they are worth it, more power, better duration and 6c charge rate is pretty quick. They also have a 40 percent discount for bringing in trashed or crashed hyperion lipos, which I use sooner or later lol!
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