88" Extreme-Flight Yak Electrified Build

[Captain Carlton]

JR, good point. Getting laminar flow over the motor could help quite a bit. Ok...now my brain is working.

Todd, my timing is at 24. So I could dial it down a bit. I am inclined to keep my power usage where it is at. Just improve the cooling. :-)

[Simpleton]

Here are some pics of the air scoops I put on mine. It's a different plane, different motor, and different mount, but maybe the basic idea is close enough.

[Captain Carlton]

Wow! Thats a smooth setup. Ok...my Squirrels are spinning now! Thanks!

[MarkF]

If you guys want to save some weight than get rid of those power expanders and lipo batteries and get a Ubec from kool flights hooked up to an on off switch. They weigh only an ounce or so and they will power your whole setup no problem. I use them on 10s helicoptors to 12s 29% giles. You dont have the vibration problems the gas guys do so you dont need to copy there setups. I'm getting ready to convert a magic hand 30% yak and thats what I will be using. I will post my build when I get started on it.

Mark

[Captain Carlton]

Mark,

The Power Box adds Two ounces and add tons of reliability...etc. I use UBEC's for smaller planes...but the Spektrum RX gear will get pissed and reset if the Voltage wavers too much. So I get dual redundant power supplies, and if a Servo stalls, the voltage won't drop, and kill the RX. My 88" Yak is about a $3500 investment to far (with a Steep discount in batteries), and I don't want to cheap out on the power system. Actually have a couple of RX batteries is very handy, as I move them around to adjust my CG.

We concluded if I had a servo stall on the plane...it would sag the voltage on a UBEC...then you going down. Its just about the level of risk your willing to accept.

- Richard

[Captain Carlton]

OK...Eagle Tree Data Log of Flight...Motor got to 160 degrees...so I am redoing the cooling on the plane. 6S-1200, Hacker A60-18L, APC 24x12TE.

[MarkF]

I doubt your stalling the servos more than I am in a 600 size heli. Also they have 6 volt ubec so the voltage is were you want to be. I saw what you have in your airplane between lipos and power boxes and its a lot more than 2 oz. If you want a better power system then get a Neu 1527 1y or a 2d with 6.7 gearbox. By the way Richard I'm the one you met at your last fun fly. I have over 10 Neu motors In various planes ranging from 29 % to 220 mph F3D. You wont find a better power source.

Mark

[Captain Carlton]

Mark,

OH...hey!!! Yah...I just literally got off the email with Predro who recommended the same power system. I am ordering one tomorrow. The Hacker needs to go into a 16 or 17 lb plane. For a Yak driver who is fairly serious, the A60 just can't cut it!

On the Servo stall issue, I am playing it safe with my first big plane. I cannot afford to have it take a dump because I get a voltage drop on the power system. Thats my primary concern. I don't want to shave the weight...and run the risk of something bad happening, when I crank this plane through a "hard" wall. As I get more experience and talk to more people...I will get more "comfy" trimming things back. I like the redundant power supplies on my plane. It will fly on either power supply.

The guy who makes the SmartFly systems (Robert I think) says that the UBEC's wouldn't share well if they were used in the Smart Fly system...in a redundant config. I am a mechanical engineer, not an electrical engineer, so I'm not going to argue with the guy.

I am going to seriously look at the new Giant Scale Spektrum/JR RX for future planes. Although the Smart Fly has been flawless.

So...Question:

Pedro told me "The prop would be a APC 26x15 for pattern, and a 27x13 for 3D." with a Neumotors 1527/1.5Y and a 6.7gearbox.

So...what brand of prop, and where would I get them. Does APC make them that big?

- Thanks

Richard

[MarkF]

Richard, thats good that your playing it smart. You should do what makes you feel comfortable. I think the ubec is good for 10 + servos so I am not worried about them stalling. These planes are just like big foamies and nothing like big gas planes. I have been using a ubec in my 29% giles for over 3 years now so I am confortable with them. Pedros choice of motor 1527 1.5 y [750 kv] is a good one but your prop rpm is going to be lower than what you have now, thats why the bigger prop. I would go for the 1527 2d [1050 kv] with 6.7 gearbox if it were me. Either way you can't go wrong. Pedros setup will use a bigger prop witch isn't a bad thing and mine would use an apc 24 x 12 to 25 x 12.5 And yes apc makes all the props suggested here. Let us know what you think after you change your motor out .

Mark

[Brian L]

Hi guys, here's a video of my 88" EFyak with the Hacker A60-18L, MasterSpin-99-OPTO ESC, and Thunder Power Extreme V2 12s 5000, turning a APC 25x12.5 pulling 94amps on a full charge. The ESC was 98 Degrees,the Batteries were 106, and the Motor was 122. I am quite pleased with the power setup and will post a freestyle video as soon as the batteries are broken in, in the video posted below I never go above 3/4 throttle.

http://www.flyinggiants.com/gallery/...hp?photo=42553

[Captain Carlton]

Brian,

We have talked to other people in San Diego who red-lined the Hacker motors too. Seems that good ducting of the airflow is pretty critical. Your not flying with the spinner, so I am wondering how much of a difference that makes in getting more direct airflow onto the motor.

My Hacker A60-18L yesterday was 161-164 degrees....which is past redline.

- Richard

[ou7475]

Guys i just ordered new 4500 6s1p 30C FP made my 24*12E apc go from 5460 @ 42.35 V 80 Amps with 5000mah 6s1p 25C to 30C 88amps 43.6V 5820 rpm and have 2 flights now and is more punch out of a hover now. Batteries barley get warm 3d @ 8min flight time. Also i tried the Xoar 28*10 Blade on my A100 because I broke my Mejzlik 27*12TH Mejzlik muck better level flight, out of hover and quiter. I also bought Kevan wheels and pulled out my JR 1400 Nicad replaced it with @ Reg's and 8 Channel 2.4 with FP 1600 7.4 Lipo I am now at 17pds 11oz on my 300 Extra. I also tried the 25*12.5 Apc E and I did static test drew 43.5 V @ 106 amps 5420 RPM on 4500 6S1p * 2 30c FP over amps my Spinn 99 Error I on programer.

[Simpleton]

Thanks, that makes me feel a little better about 6K on the 24X12 APCE I still think I have something not quite right, but maybe it's OKenough.

[JagerBomb]

Richard,

I think you're missing the boat and chasing your tail. There must be something wrong in your setup. I consider myself a "pretty serious Yak driver" and the A60 has plenty of power. To be honest you have alot of extra junk that is totally unneccesary in a 27% plane. I flew a 44% Yak for 4 years on a single receiver and no powerboxes, 15 servos. I'm not familiar with an UBEC that can be used with the 12S system, but I'm all ears. Several guys are using the 25X12.5 with great success. 100 amps will not hurt the A60, the larger diameter should help though.

Mark

	Quote: Originally Posted by Captain Carlton
	Mark, OH...hey!!! Yah...I just literally got off the email with Predro who recommended the same power system. I am ordering one tomorrow. The Hacker needs to go into a 16 or 17 lb plane. For a Yak driver who is fairly serious, the A60 just can't cut it! On the Servo stall issue, I am playing it safe with my first big plane. I cannot afford to have it take a dump because I get a voltage drop on the power system. Thats my primary concern. I don't want to shave the weight...and run the risk of something bad happening, when I crank this plane through a "hard" wall. As I get more experience and talk to more people...I will get more "comfy" trimming things back. I like the redundant power supplies on my plane. It will fly on either power supply. The guy who makes the SmartFly systems (Robert I think) says that the UBEC's wouldn't share well if they were used in the Smart Fly system...in a redundant config. I am a mechanical engineer, not an electrical engineer, so I'm not going to argue with the guy. I am going to seriously look at the new Giant Scale Spektrum/JR RX for future planes. Although the Smart Fly has been flawless. So...Question: Pedro told me "The prop would be a APC 26x15 for pattern, and a 27x13 for 3D." with a Neumotors 1527/1.5Y and a 6.7gearbox. So...what brand of prop, and where would I get them. Does APC make them that big? - Thanks Richard

[Captain Carlton]

Mark,

Power is not the really the issue. MY plane 18.1 lbs. The issue is that my motor, is going to 160-164 degrees with the outside air being 85 degrees. I have talked with some folks in San Diego, and they have had the same issue with the same motor on the same plane. Apparently some back channel conversations with Hacker, indicates that some ducting work needs to be done to really channel airflow by the motor and ESC. I made some modifications already, and those have not helped, so I have gone "all out" and covered the front of the cowl, except the top quarter, where my ducting sucks in air and drives it over the motor and into the battery box.

My ESC is not having any issues, and I stick mine where you did yours. So thats good news.