**EPP Peregrine, FFF-Eagle, Dragons and other Bird Planes** - Page 123 - RC Groups
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Jul 11, 2012, 07:51 PM
Registered User
G-LO's Avatar
Averan, its here on this thread

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Jul 11, 2012, 08:56 PM
Registered User
kompmen's Avatar
Originally Posted by Averan
@kompmen - do you have any photos of your bird? it looks like it flies really well! =)

motor 2205C 1400Kv
ESC: 10- Amp
Battery: 2S or 3s , 460mah
Jul 12, 2012, 10:11 PM
Registered User
Thanks Kompmen.

Robert, can you explain how Kompmen's hawk can fly without the front flap things, but your seagull cannot? What is the critical difference between the two designs?
Jul 13, 2012, 02:34 AM
Registered User
alldn's Avatar
This is my Eagle:

wingspan - 760 mm
weight - 122 g
motor - TURNIGY 2204-14T 19g Outrunner
battery - ZIPPY Flightmax 350mAh 2S 20C
prop - 7х6SF
A very good Eagle, can fly fast and slow. I made it for my grandchildren, they like how it flies.
Орленок. (1 min 45 sec)
Last edited by alldn; Jul 13, 2012 at 05:10 AM.
Jul 13, 2012, 03:33 PM
What could possibly go wrong?
nickchud's Avatar
Lovely bird! I'll have to add that to my must have list.

Why not make the vertical surface out of transparent plastic material? Just to make it a little bit more realistic.

Jul 14, 2012, 02:07 AM
Registered User
alldn's Avatar
I think the transparent plastic would be more heavy. In addition, from the land model looks very realistic with a white vertical tail surfaces.
Jul 15, 2012, 11:19 PM
Scratchbuild Aviation
speedactyl's Avatar
Share some of my Birds Pics

sometimes you dont need to be to realistic at all just go sci-fi all the way

The Inspiration

My planes

if its gonna be a bird or a plane mind as well do both

PX25 glider RC (0 min 57 sec)

px22 RC pusher Jet (philippines) (2 min 42 sec)
Last edited by speedactyl; Jul 16, 2012 at 12:50 AM.
Jul 16, 2012, 01:07 AM
Registered User
G-LO's Avatar
That's actually very nice! I would like very much to see the "original design" one-fuse bird that was in the beginning of the video.
Jul 16, 2012, 01:48 AM
Scratchbuild Aviation
speedactyl's Avatar
thats the only pics taken
most of my builds are as I go along.

sorry no vids of the flight when it was squish under the car seat

also about the Twin Boom design, the reason is smacking the engine down the center of the plane for safety reasons, that leave some structural issues so I've decided to split it and go around it like the S-39 layout , the downside is it makes the plane more noisy . expect a screaming Bird

Vista Verde Ground Pass (2 min 58 sec)
another view of PX22 twin boom bird at 0:20 from a Friend's FPV Plane (Just a quick overhead pass)
Last edited by speedactyl; Jul 16, 2012 at 03:21 AM.
Jul 17, 2012, 08:45 AM
Matt Mabry
Pickle72's Avatar
Hey guys, I am building the 56" version of the FFF Eagle. I actually am using 5mm Cellfoam 88 and 3mm cellfoam (plus some 2" foam in the nose I carved.
I have been searching through this huge thread for numbers and I just want to double check with you guys if I have them right.
I should be shooting for an AUW of 20-27 oz?
CG should be from 2.25" -3" from LE.
And how are you bending the wing tips? Just carefully heating and bending up or rolling over a tube? I saw that someone just cut them off, sanded an angel into it and glued them back on. Sounds easy enough.

Jul 17, 2012, 10:44 AM
Registered User
SebastianG.'s Avatar
like the pic nr.6 is there any plan ?

i would like to build that one
Jul 17, 2012, 02:19 PM
Dance the skies...
Tom Frank's Avatar
Originally Posted by Pickle72
And how are you bending the wing tips? Just carefully heating and bending up or rolling over a tube? I saw that someone just cut them off, sanded an angel into it and glued them back on. Sounds easy enough.

I used a hair dryer and a muffin tin, with VERY SLOW CAREFUL application of force. That Cell foam is brittle and can suddenly snap. A cut, angle tip can be easier, but if you want a more realistic look in flight, go for the curved tips. You could also use a different foam board for the wing tips, like dollar tree foam or Elmers foam board. These have paper clad surfaces, but it can be removed by soaking in water and rolling/rubbing it off. The foan dos not have that hard burnished surface finish like the Cellfoam, but so it's not as rigid and more compliant with heated bending.
Jul 17, 2012, 09:49 PM
Matt Mabry
Pickle72's Avatar
Thanks for the tip on bending the tips! Shouldn't be to difficult.
I've got loads of that DollarTree foam board but haven't used any in awhile. I prefer the CellFoam though if I have a choice but I have never bent it like I am going to this time.

I just put what I have on the scale, fuse/wings/motor/esc and all ply pieces comes in at 10.5 oz so I think I am on the right track. I'll set my goal at 20 oz I think. Or should I shoot for a bit less?

Jul 18, 2012, 05:08 AM
Registered User
And how are you bending the wing tips? Just carefully heating and bending up or rolling over a tube? I saw that someone just cut them off, sanded an angel into it and glued them back on. Sounds easy enough.
+1 on the heat and carefully bend method. However, if left like this, they can tend to flatten out again over time, especially if left somewhere hot. (if your model lasts that long). They are also quite easy to break on landings. I have two methods to help here:-

1)Cut a vertical slot in the tip feather and insert a thin (1mm) ply spar, which is shaped to the right bend radius.


2) Having bent the cell foam, cover top and bottom with paper, applied with wallpaper paste or similar.

Images attached show the ply inserts on some larger tips, that were then covered over with 3mm depron (cell foam) on top, but the principle works just as well on single thickness foam, if the ply is cut flush with the surfaces.

Jul 18, 2012, 03:07 PM
Matt Mabry
Pickle72's Avatar
Nicely done! I might try that if I decide to do a built up wing next.

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