Extreme Flight 88"Yak54/Jeti SpinOpto200/Plettenberg Terminator/FlightPowerEVO25/30C

[happyloop]

A few days ago, I discovered the EF 88" YAK 54 on video from Extreme Flight RC (I like big props! :p )
I was completely amazed by the stability and the manoeuvrability of that plane, both 3D and IMAC. That's the perfect performer for Aeromusical :D
And that beauty looks scale with this huge fuselage.
At that time, I knew I will fly her :D
And what about an electric set-up... :rolleyes:

Freestyle-RC from UK, the European distributor got one in stok, yeah!
Let's go for it!
Less than a week later, 3 big box where at home.
(Here, I would like to give a big thank you for the availability and proficiency of Chris Hinson from Extreme Flight RC and to Daniel from Freestyle-RC, UK. That was very fast service)

The Yak is really huge!!! perfectly build and light. ok, I made my mind, I go for Electric!

Here is my planned set-up:

Plettenberg Terminator
RASA 24/12 prop
Jeti Spin OPto 200
Flight Power Battery (Size?!, I don't know yet :confused: )
Power Box Gemini for the reception

Any suggestion is welcome as this Wonder is quite bigger than my F3A electric plane!

Keep tuned,
Benoit from Belgium

[Jocke]

Nice bird! you have any weight recomendation on the plane?

[blucor basher]

I've flown mine a bit on gas...fantastic airplane. I am going to install a Hacker on 12S, hopefully in time for the fall fly-ins. It's a tremendous airplane, I'm certain you will enjoy it.

[mexico]

That is a great picture. I thought about this plane recently with your exact setup. The size has me a little nervous. The Yak is absolutely huge. I look forward to your reports.

[blucor basher]

I was also a bit worried about the weight until I flew BoneDoc's 19lb. Dalton on 12S 5000TPX / Hacker A60-18L / Xoar PJN 24x10. That plane has plenty of pullout and pitch speed for my kind of flying.

[mexico]

If only someone would design a plane that size that was 15 lbs or lighter. That would be awesomer.

I wasn't worried that the plane was too heavy for it's size to fly well. I am just a little intimidated by how big it is. Cost of the gear and transporting it etc. So far 60" and 8 lbs is the largest plane I have flown.

[blucor basher]

Working on it now...

[mexico]

Do you carry this Yak too?

[blucor basher]

Yep. We carry the full Extreme Flight lineup.

[redflyboy122]

this is going to be sweet! keep us updated with pics and of course a flight video!!

[happyloop]

Nice bird! you have any weight recomendation on the plane?
About weight, I expect around 8.2kg/18 pounds with Flight Power EVO25 10SF3A5000 but I don't know if this will be enough battery , so 7kg dry :rolleyes:

The full kit weight was at 4.7kg ALL HARD WEAR!!! included, which is really low for such a big bird.

Here are some pictures/ weight related

rudder ready 156gr
wings ready without servo: 646 and 651gr
fuselage : 1531gr
landing gear: 347gr
really huge canopy: 440gr
engine cowl: 288gr
carbon Wing tube: 114gr
stabilizer ready: 148 and 150gr

[Jocke]

Hehe... do you know how much power you will have :) i like it!!!

but why not go full out with a 12s setup? in terms of power EVO25 5000 will be more than enough for the setup, just a matter of flight time.

[GWRIGHT]

You can look at the hyperion thread to get some ideas on power. Comes out of the same arf factory, so does quique's,.. each brand just having some minor differences in colors, wingtips, and hardware,..hence the couple inches variance in span.

I have the same 12S/A60-18L setup in mine that bonedoc and blucor had in their larger extra. With the 24X12 APC "E" its 4 to 4.4 kilowatts depending on if the batteries were charged just before flying, or a few weeks beforehand <G>. PLENTY of poop for the plane. With a 21X14 it makes a really nice IMAC style combo, although it can get a little too fast, so you have to watch the left stick usage.

[EXTREME FLIGHT]

Hello Benoit! Thank you so much for taking the time to post your set-up of the 88 inch Yak. I look forward to your assembly and flight report.

Gary, just to clarify-yes this plane is built in the same factory as the Hyperion, but not the Quique planes. Also our current 88 inch Yak is COMPLETELY different than the Hyperion 85" Yak, not even close. I'm afraid you haven't seen one up close because an experienced modeler like yourself would see a huge difference in the 2 planes.

[mexico]

Gary - assuming an 18 lb weight (may be realistic assumption or not) 4000-4400 watts is well over 200 watts/lb. Do you feel planes this size need that level of power or is it just a matter of you can so why not?

[GWRIGHT]

Didn't know that was different,..was told they were all the same factory. Thanks for clarifying.

Hello Benoit! Thank you so much for taking the time to post your set-up of the 88 inch Yak. I look forward to your assembly and flight report.

Gary, just to clarify-yes this plane is built in the same factory as the Hyperion, but not the Quique planes. Also our current 88 inch Yak is COMPLETELY different than the Hyperion 85" Yak, not even close. I'm afraid you haven't seen one up close because an experienced modeler like yourself would see a huge difference in the 2 planes.

[GWRIGHT]

No, it's not really needed, but If you know how to use the left stick, you can set it up that way, and not use it unless you want to. I can fly an entire flight sometimes, including hovering and vertical pullouts and such, and never go above 3/4 stick. I've thought about dropping to 10S and going up to the 26 or 27 inch props, but just never got around to doing it. I always thing about how people put such absurd power in things and it's not needed,..then I go and do it myself <G>.

Gary - assuming an 18 lb weight (may be realistic assumption or not) 4000-4400 watts is well over 200 watts/lb. Do you feel planes this size need that level of power or is it just a matter of you can so why not?

[mexico]

I've thought about dropping to 10S and going up to the 26 or 27 inch props,

How many amps do you think that would pull?

[mihah]

I also look forward seeing the power choice of this plane.

What about going light AND powerful?

Neu 1527/1.5Y 850 kv on 6.7:1 planetary drive
6S+6S Flightpower EVOLite 5350 mAh
Controller >100 A
Mejzlik 26x15E or if too much pitch, 27x12TH

I know this Yak has extremely large cowl so going from 24 to 27 should make some difference 3D flying.

[happyloop]

[QUOTE=EXTREME FLIGHT]Hello Benoit! Thank you so much for taking the time to post your set-up of the 88 inch Yak. I look forward to your assembly and flight report.

QUOTE]

Hello Chris, nice to see you here.
You are welcome, it's a pleasure with this beautifull plane! The quality is oustanding.
I am really waiting for the maiden flight...

[happyloop]

I also look forward seeing the power choice of this plane.

What about going light AND powerful?

Neu 1527/1.5Y 850 kv on 6.7:1 planetary drive
6S+6S Flightpower EVOLite 5350 mAh
Controller >100 A
Mejzlik 26x15E or if too much pitch, 27x12TH

I know this Yak has extremely large cowl so going from 24 to 27 should make some difference 3D flying.

Hi Guys,
Thank you for your discution.

So, about the motor, some inrunner are very good but I like the mechanical simplicity and the (lack of) noise from the outrunner.
About Plettenberg, the EVO 30-10 I got on my F3A plane is 10 to 20% lighter than the others for the same or even more power and one of the best efficiency. (I got 300 troublefree flights with it :)
As the weight to power ratio is very low, the cooling is very important and Plettenberg works with big holes in the stator (that you can see on one picture) and a specific and very efficient cooling by the spinner.
During Extreme Aerobatics, the huge gyroscopic forces from the propeller are a real source of problem in term of vibrations and motor integrity. One more time, Plettenberg (I hope they will read this! ;) got a unic propeller attachement device so close of the motor back plate that this is no more a problem.

I plan for a thrust to weight ratio about 2/1 with a good top speed (meaning a good prop pitch) for a versatil airplane able of hard 3D and nice Imac perfo, which is needed for Aeromusical.
I think the EF 88" yak needs around 5000W. It's my first electric this size but I read a lot about the 85" and this one need 4000W being quite smaller! So 5000W looks good to me.
That's why I chose the Plettenberg Terminator. This 1020gr motor should handle up to 6000W. Will see that quite soon ;)

So, I had to lengt up the engine box by around 4". I cut the strong fire wall and build a lighter one as the electric set-up does not need that strengt.
Here are the pictures:

[mexico]

Is that a folding prop? Or at least 2 separate blades?
The entire motor sits in the spinner? Going to be tough to get good air flow for cooling.

[Jocke]

Very nice installation, it will provide very good cooling, 2/1 will be no problem ;) thinking about testing a terminator myself so your build and testing is very interesting.

[EXTREME FLIGHT]

Very nice work Benoit. 5000 Watts will be insane power on this plane. I would estimate your flying weight to be around 18-20 lbs.
Even at 20 lbs that is 250 Watts/lb.!!!!

[1bwana1]

Having done a number of large electrics I have learned it is easier on the equipment to the power by going up in volts rather than amps. I suggest you go with at least 12S on this plane. I just dont think 10S will get it done.

[vinde]

Lucky me,


I saw Benoit and his Yak this afternoon.
Needless to say it was great.

The team
http://www.vinde.be/zonepub/mellery_2007/IMG_0029.JPG

Inside the "beast".
http://www.vinde.be/zonepub/mellery_2007/IMG_0020.JPG

[Jocke]

So this beast has been up in the air???? reports! performance! data!???? video!?!? give US DETALES!!!!??? plz ;)

[happyloop]

Guys, I maiden her
waouw, what a girl :)

Yesterday, First flight with FP10S2P5000 EVO25F3a (2x1220gr) 110A/ 6100rpm / rasa 24/12
So, dry weight of 7.1kg +2.4kg = 9.5Kg :eek:
the plane flies good but fell logically heavy.
For +10min, I put only 2x 3000mah.
So, I decided to try with only 1 pack FP10S5000, 97A/5800rpm and 8,3kg.
Great. Same kind of power ratio but the Yak feels great on the stiks. Very solid and neutral, just a bit of elevator on knife edge. Full rudder is easily controllable, I fell very confident with this Yak... I feel good :rolleyes:
After +6min, still 3,8V/cell. (I put back 3500mah)

Oki, lets go for it... the secret weapon: FP12S1P4500 EVO30 :D (1430gr)
Yes!!!!!!!!! 126A/ 6600rpm :D 1bwana1, you should be right!
Waouw, that kicks. The Yak likes. That's what I am looking for!!!
Climb Out of the torque-roll is roket-like.
After 5', the timer told me to land... at 6', I finally acknowledge :(
All packs are empty but I am happy :)

The Plettenberg Terminator is just warm (maybe 40c). By the way, no vibrations at all, even during heavy gyroscopic manoeuvre. The "mariage" with the Jeti Spin 200 seems perfect. Everything is running smooth and linear.

The FP 12S4500 was just warm as well (around 40c but my T° gun is u.s.) Still 44.6V on the FP12S4500 but I don't know yet how many mah, still charging. Anyway, 5min full of hard 3D will be very safe. Short as well... but so goooood, Waouwwwwww :censored:
I will sleep with a smile tonight

[mexico]

Congratualtions. It looks so beautiful. You had it right on the deck - so big.

[1bwana1]

HappyLoop,
Congratulations on your flight. Yes, you should like the 12S packs best. Weight makes all the difference! The Extreme Flight planes are some of the best designed and built planes out there. They make excellent electric conversions. I have flown the 74", and 85" version of this plane, and both are excellent. I would love to try the 88" one day. Have fun with the new plane.

[Jocke]

So you are flying a 8kg plane on 5,2kw, more than 2/1 in trust, the motor holds 89%, 24x12" 6600rpm... that awsome.. as we say in sweden
"du är galen" ;) in a good way!

So when will you hit 6kw !? :)

[EXTREME FLIGHT]

Thanks for the update Benoit. I am glad that you are enjoying the Yak. I look forward to seeing video of your plane in action.

[happyloop]

So you are flying a 8kg plane on 5,2kw, more than 2/1 in trust, the motor holds 89%, 24x12" 6600rpm... that awsome.. as we say in sweden
"du är galen" ;) in a good way!

So when will you hit 6kw !? :)

Hi Jocke?
Yes indeed, this is powerfull :D
I am testing a bit right now.
I put the Spin opto 200 from 24° to 28° advance. It imcrease the Amps from the FP10S5000 F3A from 97A and 5700rpm to 105A and 5800rpm but almost no change on 12S.
From the video, I could compare the power from the FP10S5000 to a DA50.
The 12S is an other world :D On very specific manouvers, you may need it. But it would be more practical to stay on 10S pack: same pack as my F3A and my charger are limited to 10S... May be I would try the RASA 25/12 prop for a bit more power on 10S...
It seems that I can fly 6' beeing safe on the lipos. I usually put 3700Mah max.
Once was 4200Mah for 7'... :o but still well in the limits
6kW?! Not fo this plane ;)

[happyloop]

Thanks for the update Benoit. I am glad that you are enjoying the Yak. I look forward to seeing video of your plane in action.
You are welcome Chris, you deserve it!

The plane flies very very good. It is as adapted for IMAC's sequences as for extreme 3D. The design is superb and the finish is close to perfection. I like the color scheme. The building prosess is straight forward and quick.
I really appreciate the Protective bags for the wings, elevator and canopy, what could I say more?! :)
Oh Yesss, I should speak about the Wing's carbon tube!
I realized that the carbon wing's tube from my f3A plane got the same diameter and same weight :eek: as the one from the EF Yak 88". But the well strong enough Yak 88" wings tube is 1.6 time longer !!! I could save 40gr on my F3A plane :rolleyes:
That's an nice evidence of the EF Yak's quality.

[diveredd]

Happyloop,

Thanks for this thread. I have the 74" EF Yak running on 10S using the same batteries. Its a rocket. Its nice to know I could step up the the 88" Yak or the new 88" Extra and still run it on 10S.

I like staying with the two 5S batties so I can charge them at the same time. I have an Iota 55Aamp power supply and two Thunder chargers and balancers that work great with the FlightPower batteries. With this setup I can charge both batteries at 2C.

Ed

[Jocke]

Hi Jocke?
Yes indeed, this is powerfull :D
I am testing a bit right now.
I put the Spin opto 200 from 24° to 28° advance. It imcrease the Amps from the FP10S5000 F3A from 97A and 5700rpm to 105A and 5800rpm but almost no change on 12S.
From the video, I could compare the power from the FP10S5000 to a DA50.
The 12S is an other world :D On very specific manouvers, you may need it. But it would be more practical to stay on 10S pack: same pack as my F3A and my charger are limited to 10S... May be I would try the RASA 25/12 prop for a bit more power on 10S...
It seems that I can fly 6' beeing safe on the lipos. I usually put 3700Mah max.
Once was 4200Mah for 7'... :o but still well in the limits
6kW?! Not fo this plane ;)

So you have gained power even more! hehe... (big smile) :) 105Amp on 12s, you know the volts ?, have you read the RPM tru the Jeti box/ set 20 poles?

[happyloop]

Happyloop,

Thanks for this thread. I have the 74" EF Yak running on 10S using the same batteries. Its a rocket. Its nice to know I could step up the the 88" Yak or the new 88" Extra and still run it on 10S.

I like staying with the two 5S batties so I can charge them at the same time. I have an Iota 55Aamp power supply and two Thunder chargers and balancers that work great with the FlightPower batteries. With this setup I can charge both batteries at 2C.

Ed

Hello Ed,
Your charging set-up is very good. For my part, I did not try yet more than 1C.
Which motor do you use on the EF 74" Yak?

[diveredd]

I used an AXI 5330/18. Its not as efficient as a Pletti, but works great.

I also called FlightPower and TP to confirm that no harm would occur charging at 2C. I use both TP batteries and FP and both said they can easily be charged well above 2C.

[happyloop]

So you have gained power even more! hehe... (big smile) :) 105Amp on 12s, you know the volts ?, have you read the RPM tru the Jeti box/ set 20 poles?

I mainly gained on 10S but for those, I would like to push a bit with the bigger prop: Rasa 25/12
RPMs tached on the ground with fresh pack: FP10S5000F3A at 5800rpm/FP12S4500EVO30C at 6500rpm.
RPMs from the Jeti Spin Opto 200, 20poles and airborn, I get around 6000/6100 for the FP10S5000F3A and around 6600/6700 on the FP12S4500EVO30. With the 12S, I don't put full power exept at high alpha or out of an hover, so at quite low air speed as the prop is screaming :D

No idea of the voltage.
I have an Eagle Tree monitoring device but this one is limited to 100A... so?!

[Jocke]

Cant you check the data loggin on the Jeti SPIN after flight to see the voltage during load?

[happyloop]

Cant you check the data loggin on the Jeti SPIN after flight to see the voltage during load?

Hello Jocke, after some busy days, I am back!
As the jeti Spin give only the lower/ higher volt value (what is great from a controller), I used my Eagle tree meter on the FP10S5000F3A and jeti Spin 200 on 28° advance.
This set-up give correct pull-out from hover but not roket like for 5/ 6min full of 3D.
It seems that 11S is perfect powerwise (as 12s is too much!)
I will keep experimenting en I rreally enjoy that Yak :)

[Jocke]

Even if the YAK diddent fly well (as im sure it doas) almost everything is funny with that type of power.

[happyloop]

Even if the YAK diddent fly well (as im sure it doas) almost everything is funny with that type of power.
Jocke, I agree that power versus weight is one of the key for Full aerobatic flight.
As important is the low wing loading. That's why it is great to have such top quality ARF kit like the EF Yak, able to achieve this goal even with the electric conversion.
Weight saving was a main concern during the full construction process. Even if the opportunities are limited.
For example, I choose the 1 elevator servo option. This is around 100gr/4ounces weight saving (70gr servo and some $ :p + 30gr Electric wires) . This is also a good way to keep the CG forward as the Plettenberg Terminator is only 1kg /2.2 pounds.

[Jocke]

Like the idea of only one elevator servo, how big is that servo?

[happyloop]

Like the idea of only one elevator servo, how big is that servo?

This is the very good HS5955TG

[happyloop]

This is the very good HS5955TG
As we are looking for max 3D throw, the servo's back to neutral caracteristic should be the best as possible. That's why I put the dead band width at the minimum setting (which is not when the servo is out of the box) with the Hitec Digital servo programmer.
The improvement is sensible. The noise at neutral is worth but who care :p
The servo's consumtion is higher but still low, especially on an electric power set-up. I planned to use the dual separate voltage controller with electronic swith, the "PowerBox gemini" but as I mesure around 170/220 mah for a 6min flight, the less powerfull but a bit lighter "PowerBox sensor" (35gr) with 2x FP2s800 (2x55gr) for reception are plenty enough. This is a low weight and full redudency system with monitor device. I would like to compare the comsumption on the reception with a Gas set-up?
On my F3A planes, the consumption was divided by 2.5 switching to electric due to the less vibration level and the very responsive digital servos :)

Have fun and just Fly :)

[happyloop]

here are a few Yak's shots I receive from a friend.
Let see life in White & RED... ;)

[Jocke]

Thats realy nice shots! nice flying to.

[EXTREME FLIGHT]

Nice flying Benoit!

[mexico]

delete

[happyloop]

Thank you Guys,
My friend photographer got nice equipment and he knows how to use it :)

Here is my first mishap with the Yak!
I got my first motor stall last week in a Somenzini Spin. I thing that the "foldable" rasa prop was to tightly screwed and quite no more "foldable" but with the Somenzini Spin brutality, it folded anyway, stopping the prop on the motor cowl. The Yak was then dead stick at no speed at around 30m height, just enough to land in emergency in a field ending up side down. The landing gear was way wider... :eek: and my canopy cracked :(
Repare was quick anyway. I just put the gear back to is original shape and glued the canopy with CA and put clear tape inside. Almost invisible :rolleyes:
and I did the spin again with a free prop (I mean free in the foldable axe) and it works perfectly ... up to now :p
Here are some more shots. I like the torque on the head but this is a bit dangerous ... :D


More than ever, I wish you lots of happy landings

[Jocke]

Good to hear the damage was "ok" and your now back in the sky!

Moving towards coold times here in sweden, soon it will be very hard to fly outside.

[LaxLife]

Happyloop,
Beautiful plane and thanks for all the detail in your thread. Our EP Yak54 74" uses a Hacker C50 14XL, 10 s TP's and a 20" Mejzlik prop and the power is awesome. Do you recall how much mAh you put back into the FP lipos after your 6 minute flight?

[happyloop]

Happyloop,
Beautiful plane and thanks for all the detail in your thread. Our EP Yak54 74" uses a Hacker C50 14XL, 10 s TP's and a 20" Mejzlik prop and the power is awesome. Do you recall how much mAh you put back into the FP lipos after your 6 minute flight?
Hello Laxlife,

Usually, I put back around 3300-3800Mah for 5-6min with the FP11s4500evo30c (very good power, climb-out are impressive), around 3500-3800mah for 6min on the FP12s 4500evo30c. (rocket climb-out)
Around 4000mah for 6-7min on the FP10S5000F3A (torque roll at 60%, climb out are safe but not agressif.
My next option will be FP12(10+2)S5000F3A limiting the contoller to around 100A by the radio. Doing so, I just have to add 2cells to my packs I use already in F3A) I expect same or even better power compare to the FP11S4500evo30 but with 7min safe flight time.

Your set-up on the 74" seems very powerfull and adequate. Which capacity are your 10s?

[happyloop]

Good to hear the damage was "ok" and your now back in the sky!

Moving towards coold times here in sweden, soon it will be very hard to fly outside.

I can imagine!
Belgium's weather is not as cold as in Sweden but I flew at 7°c the other day and It was... brrrrr
Hoopfully, we don't need to start and adjust the engine with bare hands... :D
Indoor season is coming... :rolleyes:

[mexico]

Happyloop - what exactly is a Somenzini spin?

[happyloop]

Happyloop - what exactly is a Somenzini spin?
Hello Mexico,
A Somenzini Spin is a manouver invented by Quique.
From high, you enter a vertical dive with left aileron rolls. At a point at your discretion and confidence (could be very low with the Yak :D ), you push full elevator and right rudder. The plane should almost stop in that negative snap becoming quikly a flat spin when you reverse the ailerons. Adding some throttle, you can make the spin flatter. (That's why it's right rudder)
I hope it helps.

[Mike Parsons]

Hello Mexico,
A Somenzini Spin is a manouver invented by Quique.
From high, you enter a vertical dive with left aileron rolls. At a point at your discretion and confidence (could be very low with the Yak :D ), you push full elevator and right rudder. The plane should almost stop in that negative snap becoming quikly a flat spin when you reverse the ailerons. Adding some throttle, you can make the spin flatter. (That's why it's right rudder)
I hope it helps.
Sounds like a blender.

[mexico]

Is it different than a blender? Or as we say it in my country licuadora?

too slow.

[sun.flyer]

Sounds like a blender.

Ditto on the QQ Blender. I doubt you could buy one of these at Sears though. :)

Tim

[happyloop]

Sounds like a blender.
I am not very good with the english name of 3D manouver :confused:
But it's nice to learn what a blender is :) as a licuadora ;)

[mexico]

Also called
攪拌器

:D

[happyloop]

Hi Guys,

Cold weather here in Belgium... To bad to fly...
With Babou, we had some time to edit a video about the EF electro Yak

http://www.youtube.com/watch?v=OfI60WGyCm0

Merry Christmas and happy loops,
Benoit

[ditchit]

I'm very keen on this if a Hyperion outrunner or something in that price range would be up to the task on 12S. I already have a few Dualsky 6S6600 25C lipos. A Terminator is way outside my budget. Anyone got an opinion on the Z5045 being suitable for this Yak?

[happyloop]

I'm very keen on this if a Hyperion outrunner or something in that price range would be up to the task on 12S. I already have a few Dualsky 6S6600 25C lipos. A Terminator is way outside my budget. Anyone got an opinion on the Z5045 being suitable for this Yak?
Hello ditchit,
At 8.5kg and the Plettenberg at 3600w(10s), the pull-out from hover is gentle. At 4500w (11s), the pull-out is great, at 5500w (12s) it's rocket like :D
I don't know the efficiency from the Z5045 but I read you can expect 4000w on 12s. This should give you a correct pull-out.
Just a deduction anyway :cool:

All the best,
Benoit

[ditchit]

Thanks Benoit. Much appreciated. So either I go for Z50 or something that throws out more watts for 12S. Thanks again.

[flyinghigh]

Loved that landing!

[Jvdo]

Hi Ben,

Nice flying in the video, also very nice set up.
I'm looking forward to meet you and see you flying it in 2008!
I'll fly the 110" Yak 54 from EF in 2008!
I'll bring it to an F3A contest so you can see it :-)

Regards

Jens Van Dorpe

[happyloop]

Hi Ben,

Nice flying in the video, also very nice set up.
I'm looking forward to meet you and see you flying it in 2008!
I'll fly the 110" Yak 54 from EF in 2008!
I'll bring it to an F3A contest so you can see it :-)

Regards

Jens Van Dorpe
Hi Jens,
Nice to see you here.
We will meet already at your 3D college party :) That's a great idea!
Waouw, great news!! The 110" EF Yak should be even better than the 88" I am jealous ;) . I am looking forward to see this huge baby in your hands :D

Cheers,
Benoit

[happyloop]

Hi Guys,

Here is a new video my friend Jean-Benoît took last week.
I like the way he edited that stuff :)
As you can see (actually, NO, you don't see the chopper! :p he tried to pick up my Yak from his airborn helicopter and his onboard camera. Not an easy game without video feedback ...yet! :D
Well done J-B

http://fr.youtube.com/watch?v=Vz9_Ja3Onv8

[alchemique]

WoW ! Very nice video! ANd editing is second to none as well!

[Dogzilla]

My god that is one sexy plane.

I can see why big planes are such an attraction. They fly so smooth and stable, it's like watching the real thing!

Great flying! The video is awesome. I love the spins you do at aound 2:30 and 3:15. Spinning harriers or something. it just looks so smooth and fluid. this plane rules!

[mexico]

Harrier rolls or rolling harrier. Spinning is on a different axis.

[EXTREME FLIGHT]

Very ncie flying Benoit, and excellent video production.
I see you have become very comfortable with your Yak, I hope you are having fun!

[happyloop]

Very ncie flying Benoit, and excellent video production.
I see you have become very comfortable with your Yak, I hope you are having fun!
Yes indeed :D Thank you Chris.

About my latest Lipo set-up, I was flying the FP11s4600 with great sucess but I always wanted to fly with my 10S F3A packs to avoid to many different packs. The Yak flies good with the FP10S5000 F3A pack but the power is a bit marginal, going out of the torque Roll a bit slowly.
So, I tried to had a 2S pack to the 10S. That's a great solution :)
Lot more power and more than 1 min more endurance.
As the 2s and 10S packs are not used in the same way, I charge the packs separately. Usually, I got a 5% mah difference after charging.
This seems ok. I suppose that the internal resistance of the older pack is a bit bigger, causing the extra consumption ... ? :confused:
But it could be the temperature difference as the 2S pack are separated of the 10S pack?!? :confused:
Does anybody knows?

[3Don]

Hello Benoit, nice thread you have here!

Video editios is really unussal and nice, also i like move on 5;16, nice to see 2.20cm yak fly like good shocky;) I should test my Yak in next few days, only few small details left, i will use DA-50 with tunned pipe, so i hope get same trust as you on FP packs. Maybe with some luck we can compare planes in Agenoria cup.

With today gas prices i like electric more and more;) So few quick question for you; as you say having different packs for each plane is to expencive/not practical... It would be very nice to use same packs for few planes, as i understand from your last post you use ussual 10s F3A pack connected with exact same capacity 2S pack, and you get 12s 5000mah pack that is perfect for 2.20cm plane? Picture of battery setup would be great.

Maybe you tested new FP 5350mah packs on F3A planes and on yak as well?

And last question what is total flying time with YAK/F3A packs?

[trucender]

Hi! This is the new link to the video http://fr.youtube.com/watch?v=upVoXNVoNBM

Sorry I had to change the soundtrack...

[Gnarly1]

link doesn't work for me.

[trucender]

Now it does :)

http://fr.youtube.com/watch?v=upVoXNVoNBM

[happyloop]

Hello Extrem Fliers,

Here are some "new" picts of the EF Yak.
I still have lot of fun with that great acrobat :D

Cheers, Benoit

PS: thanks to Patrick and Jean-Benoit for the picts :cool:

[Nelvick]

Nice Pictures !!!

[BingWing]

Very interested in doing a similar conversion but with a Hacker. What % scale is this Yak ? 30% ?

Benoit - After living with this plane for quite a while, could you give me a quite review of pros and cons etc. Would you of done anything differantly ?

Thanks

[3d-harrier]

Yes 30%