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Extreme Flight 87" Yak 54 - Build & Fly

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Extreme Flight 87" Yak 54 - Build & Fly

Old 04-28-2006, 12:49 PM
  #6901  
JWilliams
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

That is true the wingspan is 85", the covering is ultra cote, DA50 on a MTW TD75K cannister is great, and the Mejzlik 23-8 is perfect.
Jeff
Old 04-28-2006, 02:06 PM
  #6902  
Flyjets
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Guy's

One last favor I need to mount the DA 50 and was wondering if anyone has a Template they can E mail me?

[email protected]

I appreciate it.

Ian
Old 04-28-2006, 02:44 PM
  #6903  
Bosshossv8
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

THere is a template in the back page of the manual.

I would post a link to it , if I knew where it was.

Anyone??
Old 04-28-2006, 03:49 PM
  #6904  
blue ice
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Here ya go. http://extremeflightyak.shutupandfly.com/manual.htm
You can thank Drew for this.
Old 04-29-2006, 08:10 AM
  #6905  
torqmeister
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Yes. Those tabs need the extra support.
Old 04-29-2006, 08:14 AM
  #6906  
Josey Wales
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Has anyone compared a NX 23-8 to a Mejzlik 23-8 ? Ive been using the NX with great results but had the itch to try a CF prop..If there isnt much different then Id just sticj with the NX..
Old 04-29-2006, 05:30 PM
  #6907  
torqmeister
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Josey, what rpm are you turning the NX 23x8?
Old 04-29-2006, 05:44 PM
  #6908  
Josey Wales
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

With the stock exhaust, the last time I tached I was at 7200 rpms..
Old 04-29-2006, 09:28 PM
  #6909  
Bosshossv8
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

i get 7050 with a menzS 23x8...stock exh.
Old 04-30-2006, 07:15 AM
  #6910  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Thanks, I have aNX 23x8, & am looking forward to trying it. I dinged my EF 87" Yak. As soon as it is fixed the NX is going on.
Old 04-30-2006, 07:55 AM
  #6911  
Bosshossv8
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Just be careful when switching ot the 23 x 8. It must be a fully broken in motor, it does load the motor quite a bit more than the 22.

Check your tune, watch the heat...just check it after a spirited session , to make sure it is not too hot (too lean).


I had no problems switching over to it, But I did watch the heat and tune. It for sure needed a well tuned motor to perform right. Mine was still a little rich when I switched over, and it was neccesary to clean it up to get the rpms.

With the 23 x8 this thing pulls stumps, and the slow stuff gets better.
Old 05-07-2006, 11:51 PM
  #6912  
SydDythers
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Well the "Son of EF Yak 54" flew today and it went pretty well until I lost my canopy/hatch. Engine troubles kept me grounded the rest of the day.

Video (make sure that you choose the "original" option where it lists "video size" underneath the video):

http://media.putfile.com/Yak-54-Maiden

Pics:

[link]http://putfile.com/pic.php?pic=5/12619471344.jpg&s=f5[/link]

[link]http://putfile.com/pic.php?pic=5/12619455463.jpg&s=f5[/link]

[link]http://putfile.com/pic.php?pic=5/12619442092.jpg&s=f5[/link]

For anybody that has smacked up their EF Yak, I am currently in the process of recreating an exact replica (including each piece) in Solidworks which is basically a fancy CAD program. So if any of you guys crack up your birds, let me know and I might be able to shoot you a .pdf of the parts you need to make to fix it.

Cheers,

John
Old 05-08-2006, 07:21 AM
  #6913  
MSP1957
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

did you find your canopy? What type of latch system were you using?
Michael
Old 05-08-2006, 07:46 AM
  #6914  
Bosshossv8
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

I wish I could watch a putfile video, but alas, my POS computer can;t do it. I can only download .wmv's and watch them .

I flew my EF all day Saturday and Sunday, I like the EF, but it is so light , that windy day flying is not fun. I find myself flying the REject Yak a lot more. The extra 1.25 lbs make it more stable and it gets more airtime here in the windy city. The EF is for those calm and still days , I quess.

The EF flips around like no other, just gotta keep her grounded in 10-15mph. I don't like fighting to get her down.
Old 05-08-2006, 08:27 AM
  #6915  
Flyjets
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Hi Guy's

Here is my version on the Extreme Flt Yak 87" or 85".

It's got the DA 50r with a Mejzlik 21 * 11.5 3 Blade it's a thin Blade version.

Turns 6400 RPM without being tuned new Motor.

HiTec 5945 on the Elevators and Ailerons

JR 8611a on the Rudder

Futuba 3151 Throttle.

She is a bit heavy at 16.0 lbs due to the Virtual Cockpit and Pilot. This amount of weight aft of the CG forced me to use the heavy SlimLine Exhaust instead of the Cannister I orginally planned to use. However she still should perform.

Ian


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Old 05-10-2006, 01:56 PM
  #6916  
TailTouch
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Mine is up for sale...
It sucks that I don't have the time to fly it...oh well
Old 05-10-2006, 10:07 PM
  #6917  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Flyjets....

What is that picture of in the second to last photo?? Is that a CF bracket of some kind in the cowl???

Nice Yak BTW.

I flew the heck out of mine today, a windless overcast day here in Windy City.

A friend just sold his, I would imagine a few more will be sold as EF's new 50cc plane comes about. These planes are gems, and I won't be without one as long as I am in the hobby.

Old 05-13-2006, 09:57 PM
  #6918  
Flyjets
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

BossHossv8

!QUOT!What is that picture of in the second to last photo?? Is that a CF bracket of some kind in the cowl??? !QUOT!

That's the Carbon bracket I made to guide the manual choke on the DA 50. There is a small servo grommet in the hole for the 256 wire. It doesn't show in the photo since I added it today.

I still need to install the receiver Battery and Regulator and then it's time to fly this Yak.

Ian

Old 05-18-2006, 06:51 PM
  #6919  
Flyjets
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

OK Guy's

I just read the 1st 100 pages looking for CG idea's and hardly any.

6 3/8 is the recommended with up to 3/4 aft mac aft CG.

Mine is just aft of the Yellow stripe how does the Yak fly from that CG?

Last note my 21 * 11.5 3 blade is only turning 6400 RPM with the slim Line wrap around which is all I think it's capable of doing. The calculator show's this setup at 29lbs of thrust anyone have 1st hand experience with a setup like this?


Thanks
Ian
Old 05-18-2006, 06:54 PM
  #6920  
wgeffon
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Ian,

My CG is also just aft of the yellow stripe.
Go fly, you'll be fine there.
Old 05-18-2006, 07:51 PM
  #6921  
Josey Wales
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Mine is the same as Wayne's... flys beautiful..Ive never used a 3 bladed prop before so I cant help you with the R's..With a 2 bladed prop you should be somewhere between 6900-7200..I just put on a 23-8 NX I was getting close to 7200 but I backed it down to about 6900 to be sure I wasnt loading it too much..still has tons of power to spare..when you get used to it try some tumbles with 70 deg of elevator!! AWESOME!!
Old 05-18-2006, 11:17 PM
  #6922  
Bosshossv8
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Ditto , mine is right behind the stripe. Neutral as could be.

Full Thrott , Full down from hover , tumbles right on the tube.

If there is a Hall of Fame for model airplanes, this one needs to be inducted.
Old 05-19-2006, 10:45 PM
  #6923  
Flyjets
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Guy's

Today down here in Florida winds were 17mph and a 80 degree X wind for our East West Runway. Not a great Maiden day but I wanted to Fly her in an IMAA meet tomorrow. So here is my report the CG issue we all spoke about was as U Guy's described Perfect.

The Performance was in my viewpoint good but not fantastic. Vertical was very good and the Up and down lines were the same speed. The Model flew straight with 1 trim adjustment in roll.

The Knife Edge pass needed no coupling and Rolls were axial.

Landing in these winds I made a practice approach and I was fast for this light weight machine.
Next pattern slowed a bit more and drove her in at a semi fast speed landing was fine but then I did something that upset the Yak. I used up Elevator to plant the Tail and the Yak got Airborne again.

I was surprised at such a slow speed it did this but it is very low wing loaded machine anyway it got about 1 to 2 feet and I forced her back down to the runway.

I noticed the Wheel Pants seem really flimsy and I went ahead and removed them. The 3 Blade is OK but not great. At 16.0 lbs she performs very nicely. But U Guy's already knew all this..................

Day # 2 with 3 more flights including formation acrobatic show.

Very light flying Yak and still good power with the 3 Blade but not a 3D setup.

Ian
Ian
Old 05-20-2006, 07:42 PM
  #6924  
JWilliams
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Keep flying it you will think the performance is great soon.
Jeff
Old 05-20-2006, 08:29 PM
  #6925  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

We had 17-18 mph wind here in Chicago today, I had mine at the field. Too windy for me, this is a very lightly wing loaded plane, and yep, she gets blown around, so it was just show and tell.

A friend with an 18 lb AW QB Yak had no problem with the windy conditons.

I prefer the light one, cus on those no wind evenings, IT ROCKS>.................

I just gotta look at the sock before I go to the field.

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