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Old May 29, 2012, 03:02 PM
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Spain, CT, St Pere de Riudebitlles
Joined Mar 2010
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Recommended "yak type" foamy

I'm getting all those things in a few days:
Motors:ESC:
  • 2x Hobbyking SS Series 15-18A ESC
  • Hobbyking SS Series 18-20A ESC
Servos:
  • 4x HK15178 Analog Servo 10g / 1.4kg / 0.09s
  • 6x HK15148 Analog Servo 17g / 2.5kg / 0.14s
Batteries:
  • 3x ZIPPY Flightmax 1000mAh 3S1P 25C
  • 2x Turnigy nano-tech 950mah 3S 25~50C Lipo Pack
Props:
  • 3x SF E-Prop 7x5 / 178x127mm w/ Adapters Black (5pcs/bag)
  • 3x SF E-Prop 8x3.8 / 203x96.5mm w/ Adapters Black (5pcs/bag)
  • 3x SF E-Prop 9x4.7 / 229x119.5mm w/ Adapters Black (5pcs/bag)
  • 1x SF E-Prop 8x3.8 / 203x96.5mm w/ Adapters Black (5pcs/bag)

And I would like to know if I can do a "yak type" foamy, and if I can, what sould be the best and the easiest one (never built a foamy ) or I have to buy other things like another motor or props or batteries...
Thanks in advance!
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Old May 29, 2012, 05:55 PM
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I'd use the 1300kv motor on a small 3cell and build one of Leadfeather's EPPYak55's... But I'm biased, I've had a couple different 55's and I like his the best.
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Old May 29, 2012, 07:22 PM
Lost but making good time
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I have to agree with jones...there are a lot of Yak 55s out there but none better than Leadfeather's design. I use all three of the motors you have purchased and the 1300 Kv is the best for the 32" Yak 55. The other two have more power than is necessary and just add extra weight. I've used both the 8" and 9" props with small 3 cell batteries as jones has suggested (500 mah, 3S, 20c). I tried a 3s 20c 750 mah battery last week for the first time with a 9" prop and a 10amp esc and smoked the esc in about 5 minutes so you are doing the right thing with a little larger esc, especially if you are going to get into a lot of hovering.

Have fun... there are many others but only one Leadfeather Yak 55.

Regards,

Hankg
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Last edited by hankg; May 29, 2012 at 08:44 PM.
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Old May 30, 2012, 12:51 AM
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Spain, CT, St Pere de Riudebitlles
Joined Mar 2010
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Ok thank you very much, I think i'll buy a 25A or maybe the 25-30A ESC.
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Old May 30, 2012, 01:42 AM
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Xerpi: I'm not an expert with the "blue wonder" 2730 series motors (mine uses a custom wound jobbie) but I think a 15-18a would be enough... What do you use on yours hankg? My homebrew spins a gws 8x4 to about 8.5a (86w, 3s 25c 370mah nanotech), which throws it around nicely @ about 8oz auw. Lighter is better on these tho, when I first flew it it was about an ounce lighter, it's still fun but was better before all the extra repair weight...

Hey hankg nice 55! Yours looks a lot prettier than my poor beat up and oft repaired old thing!
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Old May 30, 2012, 07:09 AM
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xerpi...jones,

I think if you stick with the 15-18 amp esc you will be fine. I always try to bring my plane in at around 8 oz too. I'm a firm believer in keeping them as light as possible so you can keep the speed down and keep them airborne at the same time. I should have been thinking straighter when I put that 20c 750 mah 3s on with a 10 amp esc. 20 times .750 comes out to be 15 amps, not 10. That being said...the plane really flys well with a 750 mah 3s battery. .It was very stable in all positions.

A Yak really doesn't start developing a personality until it has an extra half ounce of welders on it to fill up the rips!

Have fun all...thats what foamies are for.

Regards,

Hankg
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Old May 30, 2012, 10:12 AM
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Spain, CT, St Pere de Riudebitlles
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Ok, I will try to do the Leadfeather's one, but since I'm using a heavier electronics I don't know which size I should use, maybe the 30" one? Thank you again!
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Old May 30, 2012, 10:39 AM
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xerpi,

Build the 32" one if you can. I've got both the 30" and the 32" and the 32" just seems to fly better...maybe the extra wing area. The build video is on the "Scratchbuild site", also Mike (Motorhead) at www.fancyfoam.com has a build section too. Don't worry about the landing gear. They just get in the way. Keep it as clean as possible.

http://www.rcgroups.com/forums/showthread.php?t=964237

http://www.fancyfoam.com/instruction...P%203D%201.pdf

Have fun with it.

Regards,

Hankg
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Last edited by hankg; May 30, 2012 at 10:48 AM. Reason: build directions
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Old May 30, 2012, 03:28 PM
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Spain, CT, St Pere de Riudebitlles
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Quote:
Originally Posted by hankg View Post
xerpi,

Build the 32" one if you can. I've got both the 30" and the 32" and the 32" just seems to fly better...maybe the extra wing area. The build video is on the "Scratchbuild site", also Mike (Motorhead) at www.fancyfoam.com has a build section too. Don't worry about the landing gear. They just get in the way. Keep it as clean as possible.

http://www.rcgroups.com/forums/showthread.php?t=964237

http://www.fancyfoam.com/instruction...P%203D%201.pdf

Have fun with it.

Regards,

Hankg
I'll try with the 32" but I have searched a bit for this plans and I haven't found any 32" plans, could you link the pdf link please?
Thanks again, you have helped me a lot!
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Old May 30, 2012, 05:46 PM
Lost but making good time
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xerpi,

I used the PDFs in "Report #2" of the rcgroups thread...http://www.rcgroups.com/forums/showthread.php?t=964237. When I printed them out I set the scale on the PDF to 100 percent. Another technique I've used is to transfer the PDF that contains the side and top views of the various parts of the plane (EPPYak 55_full_chg_d.pdf) to a flash drive and go to a local "Staples" and they will size the printout to a 32.5" wingspan and they print one giant full size printout for a few dollars. You probably have something similar in Spain. That way I don't have to tape everything together in 8 1/2 x 11" pieces.

I double checked the dimensions on my plane and they measure the same as the PDFs at 100%. I hope that helps. Don't hesitate to ask questions. There are a lot of people who fly this plane and really enjoy it. I'm sure there will be more come on this thread to help you out with the build or answer questions.

Regards,

Hankg

Post Script...Looked around for these by Motorhead...Simple and straight to the point.
Yak 55 construction part 1 (5 min 51 sec)


Yak 55 construction part 2 (6 min 58 sec)
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Last edited by hankg; May 31, 2012 at 07:29 PM. Reason: clean up messy spelling etc...added Motorheads videos
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Old May 31, 2012, 01:40 PM
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Nice videos, btw, I have just cut the plans, so tomorrow I'll go out there to find any EPP seller in a near town. I will also buy a hot glue gun, a good cutter or a bistoury and this stuff. Thanks again!
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Old May 31, 2012, 02:50 PM
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xerpi,

Take your time, do it right and have fun!

Regards,

Hankg
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Old Jun 01, 2012, 03:53 PM
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United States, AZ, Tucson
Joined Apr 2012
329 Posts
32" Yak-54

This one flies nice. I can't remember where I got the plans from. The Leadfeather Yak55 is also a great plane.
http://www.hobbyking.com/hobbyking/s...Outrunner.html
FF Yak54a.avi (1 min 25 sec)
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Old Jun 01, 2012, 05:48 PM
Lost but making good time
Joined Nov 2008
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boa,

Man, how do you keep track of which side is up without some paint on that little hummer? Nice flying!

Regards,

Hankg
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