DW foamies BAF 48" yak 54 build thread - Page 2 - RC Groups
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Sep 29, 2008, 07:31 PM
DWFoamies

Baf Yak Cg


The BAF YAK's typically come in tail heavy. Thus, the need to keep the servos up forward. We often cut one of the firewall supports out to get the battery further forward. The CG location on the BAF 48" YAK is about 1/4" behind the spar.

This is not the case with the Juka, you need to put the servos further back to make CG. The CG on the Juka ends up about 1-1 1/4" behind the spar. As you mentioned, when further aft makes for a cleaner, less sloppy linkage.

The final location of the servos really depends on the size of motor and battery you are using.

Mike
www.DWFoamies.com
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Sep 29, 2008, 07:38 PM
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My maiden flight was really windy, so I couldn't tell how the KE held, that and the weak single servo rudder on maiden I didn't want to stress it. I added the second servo for the tail after the maiden. Hopefully it will be more calm this coming weekend.

My Turnigy motor's quite heavy, so is the esc, maybe that's why I can balance it with the servos in the back. My 2250 3S lipo sits even with the leading edge of the wing. I even tried my 330g 4S A123, it flew heavier but very manageable.
Sep 30, 2008, 11:08 AM
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appleflyer's Avatar
Quote:
Oh, and just curious, but why did you put the electronics ontop of the plane?
i donno, i guess so there easier to get to.
Sep 30, 2008, 11:09 AM
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appleflyer's Avatar
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What is your AUW with this setup. This setup is very similar to mine.
26oz with the 3s 1500mah.
Sep 30, 2008, 11:15 AM
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appleflyer's Avatar
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BTW, is there a reason to have the tail servos so far forward? Is this to help with balance? I moved mine all the way to the back so the linkages are shorter, less slop.
i did this cuz i hate servo extensions! and with my setup i can just balance it on the spar with my battery right behind the firewall. so if the servos were farther back i would have to add nose weight.
Sep 30, 2008, 11:34 AM
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mexico's Avatar
Mike - Should I assume the gear from the 55" Juka would be too heavy for the 48" models??
Last edited by mexico; Sep 30, 2008 at 11:54 AM.
Sep 30, 2008, 12:31 PM
DWFoamies

48" vs. 55" BAF's


Mexico,
The larger motor will work but you will need to manage the throttle, this will also help the fight times and the HS-82's will also work just fine. If you use a 20C 1500 mAh pack your weight will be around 31-32 ounces. To have fun, that should be the max weight in the 48" airframe.

The BAF 48" kits are the same construction as the 55" except for the hinging system. That was eliminated to save weight.

Mike
www.DWFoamies.com
Sep 30, 2008, 12:35 PM
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mexico's Avatar
And run a smaller prop? Instead of the 14x7 something like a 12x6 or 13x6.5?

48" vs 55" is a tough call. I guess it depends on how Big you want your Assfoamie to be.
Sep 30, 2008, 05:30 PM
You brought two too many.
FlopGun's Avatar
I'm going to try a Torque 2814-900 with an Elite 45 ESC, 146 gram 1800 mah 20 c Lipo and HS-65mgs with my Juka 48. What AUW and flight times should I expect with this setup?
Oct 01, 2008, 08:20 PM
Xpress..'s Avatar
Hmm, about the Park 480 system:

A guy at my field has a couple of acromasters and he runs them at about 34-35oz. with Park 480's. Not exactly a screamer pulling out of a hover, but it does 3D pretty well. The Park 480 seems to be a perfect match for the 48" kits, since AUW is around 26-32 or so ounces.

appleflyer, looks like you scored big time with the 26oz. AUW
Oct 02, 2008, 03:00 PM
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appleflyer's Avatar
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appleflyer, looks like you scored big time with the 26oz. AUW
ya it really floats.
Oct 02, 2008, 08:15 PM
Xpress..'s Avatar
Sweet.

Hmm, I wonder if it would be possible to get the AUW in around 20 or so oz. with a light setup, and possibly milled foam...
Oct 02, 2008, 08:29 PM
Epic Huckin'
paintball_kidz's Avatar
48" yak 54 pro sounds weak
Oct 03, 2008, 11:10 AM
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appleflyer's Avatar
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Sweet.

Hmm, I wonder if it would be possible to get the AUW in around 20 or so oz. with a light setup, and possibly milled foam...
i dont think so. besides it fly great at 26oz, and i think at 20oz wind would be to much of a problem.
Oct 05, 2008, 01:57 AM
3DHS Junkie
Quote:
Originally Posted by FlopGun
I'm going to try a Torque 2814-900 with an Elite 45 ESC, 146 gram 1800 mah 20 c Lipo and HS-65mgs with my Juka 48. What AUW and flight times should I expect with this setup?
FlopGun,

I just finished & maidened my 48" Juka today. I used the Torque 2818-900, Airboss 45, 4 HS65MGs and 3s 2200. AUW is 30.44oz and it flies great IHMO.
7 minute flights used 1300mah +/-. I could use lighter packs but I like the way it handled the wind today.


Mike,

Great talking with you the other day, love the Juka. It's already doing what I was looking for.


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