88" Extreme-Flight Yak Electrified Build

[Captain Carlton]

OK, good news. My new ducting worked great. I flew it hard today and max temp was 124 to 125. So thats about 40 degrees cooler!!!! I will post photos when I tear the cowl off again!

[Simpleton]

That's excellent, really a worthwhile effort to lower the temps that much.

[JagerBomb]

	Quote: Originally Posted by Captain Carlton
	OK, good news. My new ducting worked great. I flew it hard today and max temp was 124 to 125. So thats about 40 degrees cooler!!!! I will post photos when I tear the cowl off again!

Do you have those pics yet?

Mark

[ben_beyer]

I might have missed it, but did you ever see how many watts you're getting at full throttle?

[Captain Carlton]

Hi Guys. The Max Watts were 3400. I am down at the MWE event in San Diego now, and I talked to the Hacker folks. Turns out there is a Rev 1, and Rev 2 version of the A60-18L. I was sold a discontinued A60 Rev 1 model, which has known issues about over heating. THe Rev 2 has been out for a year, so I was sold old stock.

So I have to tear out the motor and send it to hacker. I'll shoot photos of my cooling ducts when I take it apart next week. The Hacker Demo pilots here are flying the Exact same setup...but with a Rev2 motor, and 25 inch APC props versus my 24" which overheats my Rev 1 motor.

So the Mystery is solved...now I just have to get the motor replaced.

[higharc]

I'm about to build the 88" yak powered by a Hacker A60 18L with a pair of 6s 5000mAh Tanic Packs flown in series. I'll be using the Spin 99 Opto for my controller. I've read this entire thread and found allot of valuable information on this build. Congrats Mark. I would really like to hear from any of you guys if you programmed any parameters in the Spin 99 or basically fly your yaks with the ESC set with the factory settings. Any suggestions would be greatly appreciated.

Bob

[Captain Carlton]

For what it is worth...I was 'throw'n it down" with some low level 3D action...and my Master Spin Redlined and cut off. So I am install a new left wing...and a fan on top of the heatsink on the ESC. So I have the mojo to keep rolling. :-)

- Richard

[Lokiyawl]

Hello, I am considering building an electric 88" Yak. I am considering using the Plettenberg Terminator
with a 170 ESC running 14S 4-5000 MAH. I am currently flying a couple of the EF 74" Yaks, one with an Eflite
Power 160 and the other a Plettenberg EVO. Both are using the Master Spin 99 ESC's and have proven to be
good setups, about 400 flights now. The 88" looks like it flies a lot more floaty than the 74" and of course it is
bigger. (grin) This project was not affordable to me just a couple years ago but since then Lipos can be bought
for just a fraction of the cost. So does anyone have any thoughts about my planned setup or any plans to build
another electric 88" Yak?

James Alton

[Captain Carlton]

James,

I have been flying the EF Yak 88... two of them ...Hacker A60-18L and Hacker Master Spin 99...and this setup is really unacceptable for any 3D Plane that most likely going to run 18+ lbs. (like the AJ Slick 89). Because this setup is so underpowered (hovering at 70 or 80% power), you have to stand on the throttle at 100% continuously for any serious 3D moves... with basically zero forward airspeed. This results in hot motors, and frequent ESC thermal shut downs. I have two identical planes...with the identical same problems. The bottom line is that the ESC needs to hang out the bottom of the fuselage somewhere to get the cooling...or run a much larger ESC.

I am actually in the process of pulling out one of the hacker setups and loading the largest Scorpion setup... to see how that does. The Scorpion big ESC is rated for 120 AMPS (20 more than the Hacker). It should deliver more power for sure...and hopefully run cooler.

Matt Stringer is who is becoming quite a pilot ... has the same setup...unless he sold it by now .... and he blew at least one free style routine at a contest...and one big demo...because of this issue. He would get about 60 seconds into the demo and poof...thermal overload and deadstick. I think if you fly in the mid west...where it always frosty and cold...it might be a good setup...but in the IMAC SW region...it sucks donkey balls.

The guys at 3DHS are high on the Plettenberg gear. I have no opinion of it...other than it is expensive. Its probably worth every penny. For now I am wringing out the Scorpion gear.

- Richard

[Simpleton]

	Quote: Originally Posted by Lokiyawl
	Hello, I am considering building an electric 88" Yak. I am considering using the Plettenberg Terminator with a 170 ESC running 14S 4-5000 MAH. I am currently flying a couple of the EF 74" Yaks, one with an Eflite Power 160 and the other a Plettenberg EVO. Both are using the Master Spin 99 ESC's and have proven to be good setups, about 400 flights now. The 88" looks like it flies a lot more floaty than the 74" and of course it is bigger. (grin) This project was not affordable to me just a couple years ago but since then Lipos can be bought for just a fraction of the cost. So does anyone have any thoughts about my planned setup or any plans to build another electric 88" Yak? James Alton

Miha H is running a Terminator in an 88" EF Extra, some good info in His thread

[can773]

	Quote: Originally Posted by Lokiyawl
	Hello, I am considering building an electric 88" Yak. I am considering using the Plettenberg Terminator with a 170 ESC running 14S 4-5000 MAH. I am currently flying a couple of the EF 74" Yaks, one with an Eflite Power 160 and the other a Plettenberg EVO. Both are using the Master Spin 99 ESC's and have proven to be good setups, about 400 flights now. The 88" looks like it flies a lot more floaty than the 74" and of course it is bigger. (grin) This project was not affordable to me just a couple years ago but since then Lipos can be bought for just a fraction of the cost. So does anyone have any thoughts about my planned setup or any plans to build another electric 88" Yak? James Alton

Hi James

I will be doing a PAU Sukhoi 50cc build thread in the near future. I will be powering it with a Pletty Terminator, Schulze 40.160 ESC and 12s 5000 mAh packs. My setup will have the Terminator mounted in the spinner (available from Pletty) and use the Rasa 24x12 prop intially. Power should be in the 5kW range I am guessing.

I am not sure you will need 14s on the Terminator, the kV of the motor is more set for 10-12s packs.

I have been a Pletty team pilot for many years in F3A, they are expensive motors but very high quality. I still have the prototype 30-10 Evo from 2006 with over 1000 flights on it, and still running as good as day 1 !

I am still waiting on all the bits to show up for the Sukhoi before I start on the thread though.

Chad Northeast

[Lokiyawl]

Chad,

Thanks for your input. I just got confirmation from Plettenberg that the Terminator can be run safely on 14S with bursts of just a few seconds to 120 AMPS. That could yield 6300+ watts which should be gobs of power. The interest in the 14S is to allow the use of my stash of 5S 5000 packs. Add a 4S in series and I have upped my battery power by 40% and the 88" Yak is about the same percentage heavier than my 74" Yak so I am hoping for similar flight times. The downside of the 14S is the smaller prop, about 22" but then I believe that is about what is used on the DA. Let me know what you think of my idea, I am just in the planning stages at this time.

Thanks,
James

[Lokiyawl]

Simpleton, Thanks for suggesting the EF Extra thread, I actually found it earlier and there is some good information there. James

[Lokiyawl]

Richard,

I responded to your very helpful email but I don't see it on the board so I am posting again. Thanks for you input
on the Hacker and the 99 AMP ESC setup. I am running the same ESC in my 74" and with the Plettenberg EVO and I have a bit over a 2:1 power to weight ratio and maybe 1.8:1 with the Eflite Power 160 which is heavier but has been 100% reliable. I would be nervous having so little reserve power while hovering down low and having an ESC shut down. I have done hovers exceeding 3 minutes with these setups with no shutdowns and only a very mild temp rise on the ESC, motor and batteries, 400+ flights and not one problem..electric can be wonderful!

Having an ESC shutodwn from time to time would pretty well eliminate the advantages of going to electric to start with for me. I try to size my ESC's so that they are a good bit larger than the max expected amp draw. It costs more in weight and $$ but I think that it is worth it for a plane that is important to you. I would like to try and come up with a setup for the 88" Yak that would meet the following criteria:
1. Have at least a 2:1 thrust to weight ratio
2. Be able to utilize my existing 3850-5350 5S batteries.
3. Have flight times of at least 7-8 minutes which is what I am getting with my 74" Yak.
4. Not be excessively heavy. ( I think that to get 8 minutes that I will be a good pound heavier than a light DA setup on the 88" Yak)

The Plettenberg on 14S seems like it might meet these requirements and exceed the thrust to weight ratio by a good margin. The cost of that motor is a concern of course and I wonder how the effeciency will be at the higher RPMS. Has anyone else run the Pletty on 14S and have any feedback on flight times? I think that the EF 88" Yak is an epic plane and would love to have a really nice electric setup in one. If anyone has any thoughts or ideas let me know. EF is currently out of the Yellow and Black color scheme so I have time to research this...
Thanks, James

[Captain Carlton]

James,

Yah...the power reserves with 12S-5000 and the hacker...are really bad....for what we do anyway. I think 12S-5000 will work itself...with healthy batteries...and with 120AMP+ ESC. Ideally...you going to want a reliable 5000 watts of juice on hot standby.

For what it is worth, I am flying a 26-29lbs QQ Yak 102 with 14S-5000 or 14S-10000...with a Schulty ESC...and NEU power. A real nice setup!!! 28x20 prop...and about 7100 watts. Sweet ride.

But like I said...I am still unkinking my 50cc birds.

- Richard