SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Sep 29, 2008, 06:31 PM
San Diego, CA
Joined Oct 2001
472 Posts
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
electric-2000 is offline Find More Posts by electric-2000
Site Sponsor
Reply With Quote
Sign up now
to remove ads between posts
Old Sep 29, 2008, 06:38 PM
Registered User
Joined Sep 2006
1,560 Posts
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.
rcboosted is offline Find More Posts by rcboosted
Reply With Quote
Old Sep 30, 2008, 10:08 AM
Fly DW foamies!
appleflyer's Avatar
longmont, CO
Joined May 2006
1,285 Posts
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.
appleflyer is offline Find More Posts by appleflyer
Reply With Quote
Old Sep 30, 2008, 10:09 AM
Fly DW foamies!
appleflyer's Avatar
longmont, CO
Joined May 2006
1,285 Posts
Quote:
What is your AUW with this setup. This setup is very similar to mine.
26oz with the 3s 1500mah.
appleflyer is offline Find More Posts by appleflyer
Reply With Quote
Old Sep 30, 2008, 10:15 AM
Fly DW foamies!
appleflyer's Avatar
longmont, CO
Joined May 2006
1,285 Posts
Quote:
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.
appleflyer is offline Find More Posts by appleflyer
Reply With Quote
Old Sep 30, 2008, 10:34 AM
Registered User
mexico's Avatar
NJ
Joined Aug 2003
8,893 Posts
Mike - Should I assume the gear from the 55" Juka would be too heavy for the 48" models??
mexico is offline Find More Posts by mexico
Last edited by mexico; Sep 30, 2008 at 10:54 AM.
Reply With Quote
Old Sep 30, 2008, 11:31 AM
San Diego, CA
Joined Oct 2001
472 Posts
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
electric-2000 is offline Find More Posts by electric-2000
Site Sponsor
Reply With Quote
Old Sep 30, 2008, 11:35 AM
Registered User
mexico's Avatar
NJ
Joined Aug 2003
8,893 Posts
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.
mexico is offline Find More Posts by mexico
Reply With Quote
Old Sep 30, 2008, 04:30 PM
Gonna need a bigger plane . .
FlopGun's Avatar
Kitsap County, WA, USA
Joined Jul 2007
2,951 Posts
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 is offline Find More Posts by FlopGun
Reply With Quote
Old Oct 01, 2008, 07:20 PM
WARNING: May contain spam
Xpress..'s Avatar
United States, CA, Alpine
Joined Oct 2007
20,936 Posts
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
Xpress.. is offline Find More Posts by Xpress..
Reply With Quote
Old Oct 02, 2008, 02:00 PM
Fly DW foamies!
appleflyer's Avatar
longmont, CO
Joined May 2006
1,285 Posts
Quote:
appleflyer, looks like you scored big time with the 26oz. AUW
ya it really floats.
appleflyer is offline Find More Posts by appleflyer
Reply With Quote
Old Oct 02, 2008, 07:15 PM
WARNING: May contain spam
Xpress..'s Avatar
United States, CA, Alpine
Joined Oct 2007
20,936 Posts
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...
Xpress.. is offline Find More Posts by Xpress..
Reply With Quote
Old Oct 02, 2008, 07:29 PM
Epic Huckin'
paintball_kidz's Avatar
Surrey, BC
Joined Jun 2007
2,388 Posts
48" yak 54 pro sounds weak
paintball_kidz is offline Find More Posts by paintball_kidz
Reply With Quote
Old Oct 03, 2008, 10:10 AM
Fly DW foamies!
appleflyer's Avatar
longmont, CO
Joined May 2006
1,285 Posts
Quote:
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.
appleflyer is offline Find More Posts by appleflyer
Reply With Quote
Old Oct 05, 2008, 12:57 AM
Team 3DHS, Hacker, Gens Ace
United States, CA, Fullerton
Joined Nov 2007
2,098 Posts
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.
ipsmotors is offline Find More Posts by ipsmotors
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion DW Foamies Yak Junior Build Thread NumbSkull 3D Foamies 90 Feb 01, 2012 03:25 PM
Discussion DW Foamies BAF Yak Xpress.. 3D Flying 14 Jun 14, 2008 11:08 AM
Video DW Foamies Big A$$ YAK 54 electric-2000 Electric Plane Talk 6 Dec 08, 2007 09:13 PM
Insane Foamies Full Fuse Yak-54 build and fly thread! j_z_123 3D Flying 52 Aug 20, 2005 09:48 PM
Insane Foamies Mini Yak-54 build/fly thread! emnm79 3D Flying 12 Aug 13, 2005 07:12 AM