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Dec 07, 2008, 06:53 AM
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leadfeather's Avatar
Discussion

EPP Yak55M Indestructible practice plane 138gr AUW


Here is a pretty nice flying,and very durable plane.

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A lighter build has been completed and flown Dec 23 2008, AUW 158 grams.

EPPYak55.wmv (3 min 4 sec)
Last edited by leadfeather; Mar 17, 2009 at 01:40 PM.
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Dec 07, 2008, 08:10 AM
Registered User
Nice build and painting! Looks similar to FF yak 55m but smaller control surfaces. Next time try do build it from 3mm depron, it'll make it way lighter.

Dimitry
Dec 07, 2008, 09:03 AM
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leadfeather's Avatar
Quote:
Originally Posted by Dimitry999
Nice build and painting! Looks similar to FF yak 55m but smaller control surfaces. Next time try do build it from 3mm depron, it'll make it way lighter.

Dimitry
It is a similar size to the FF yak, and once I can fly better I will probably upgrade to the FF Yak kit.

At this point, I would have already totally destroyed 4 or 5 depron Yaks, yet with all the crashing I have done with this epp yak it still looks brand new.

AUW minus battery is 167 grams with a Blue Wonder motor and 12 gram esc. There is room for improvement on weight.

Very cheap and easy to build too. The only carbon is the wing spar and tail spar. No other bracing required. The entire airframe is cut from 1 sheet of 18" x 36" epp from RCFoam.

I wasn't expecting to have something competitive for the F3 type competitions, however, for a practice/learning plane I think this one will serve me well.

Dan
Last edited by leadfeather; Dec 07, 2008 at 09:43 AM.
Dec 07, 2008, 12:21 PM
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leadfeather's Avatar
Quote:
Originally Posted by Dimitry999
Nice build and painting! Looks similar to FF yak 55m but smaller control surfaces. Next time try do build it from 3mm depron, it'll make it way lighter.

Dimitry

BTW the paint job was by Adreher...he does phenomenal work. Check out his posts to see more of his artwork. He's also a very good pilot.
Dec 08, 2008, 09:14 AM
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yuefeifei's Avatar
nice one!It flies so slow!
Dec 08, 2008, 09:52 AM
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Fune's Avatar
Nice paint
Dec 08, 2008, 11:28 AM
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leadfeather's Avatar
Thanks guys!

Slow flying is exactly what I was after...and durability. Flying that slow gives my brain time to figure out which way to move the sticks. The epp stands up to the punishment I inflict when I still move the sticks the wrong way occasionally.
Dec 09, 2008, 01:01 PM
ProBro Wulf
Wulf_Flieger's Avatar
Would it be possible to get a copy of your plans for this plane?
Dec 09, 2008, 02:02 PM
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leadfeather's Avatar
Quote:
Originally Posted by Wulf_Flieger
Would it be possible to get a copy of your plans for this plane?

Here you go, post #2:

Plans
Dec 09, 2008, 07:14 PM
ProBro Wulf
Wulf_Flieger's Avatar
Thanks!
Dec 10, 2008, 10:45 AM
Registered User
skunkworks2006's Avatar
I like it!
Lighter is always better, but it seems to fly really well. It's just the sort of thing I need to practice F3P and 3D. I'm wondering what the punch-out is like though. I didn't see anything really aggressive in the video. Is it capable of a strong punch-out?
Dec 10, 2008, 05:49 PM
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leadfeather's Avatar
Quote:
Originally Posted by skunkworks2006
I like it!
Lighter is always better, but it seems to fly really well. It's just the sort of thing I need to practice F3P and 3D. I'm wondering what the punch-out is like though. I didn't see anything really aggressive in the video. Is it capable of a strong punch-out?
skunk, I didn't really try to punch it out of hover, but I think it would be OK but not spectacular at this point.

I am planning on doing more work to get the weight down. It is fun the way it is, but as a personal challenge I want to see if I can get it down to the F3P type of weights but keep it just as simple to build at the same time.

If I can get the weight down, I think the performance will be closer to the F3P machines especially if you use a comparable power system.
Dec 17, 2008, 10:26 PM
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leadfeather's Avatar
Quote:
Originally Posted by skunkworks2006
I like it!
Lighter is always better, but it seems to fly really well. It's just the sort of thing I need to practice F3P and 3D. I'm wondering what the punch-out is like though. I didn't see anything really aggressive in the video. Is it capable of a strong punch-out?
I agree lighter is way better!

Hereare a couple of photos of the lighter build in progress now. Target AUW is between 150 and 160 grams
Dec 24, 2008, 07:13 AM
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leadfeather's Avatar
Quote:
Originally Posted by skunkworks2006
I like it!
Lighter is always better, but it seems to fly really well. It's just the sort of thing I need to practice F3P and 3D. I'm wondering what the punch-out is like though. I didn't see anything really aggressive in the video. Is it capable of a strong punch-out?
Skunkworks,

Here is a video of the lighter build, 158 grams AUW, lighter Yak in it's first outing last night. You'll get to see strong punch outs.

You'll also get to see one of many durability tests the Yak was put through last night. Passed all the durability tests (crashes) with flying colors.

Skinny Yak (5 min 12 sec)
Mar 17, 2009, 07:56 AM
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leadfeather's Avatar

Under 5 oz


The development has continued. The Yak in this video is now under 5 oz AUW.

EPP Yak55 (3 min 22 sec)
Last edited by leadfeather; Mar 17, 2009 at 11:21 AM.


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