Hacker EPP Mini Warbird (20 inch wingspan)

I like the almost unbreakable X-Twins a lot, but I wanted something more sophisticated. This warbird mad from EPP foam is about twice the size of an X-Twin, and is pretty sturdy. Now I only have to learn to fly it properly :p

Components used:
-HXT 2S 400mah 15C lipo
-HXT 9g 3500kv brushless outrunner with a 5x4 prop
-some 10A esc
-2 x HXT 5g servo for ailerons and elevator
-5g Corona RS410II receiver

Wingspan is 50cm (20 inch), all up weight is less than 110g, including lipo. And it's possible to fly it with some wind as well :D

Here's a nice review/build log: http://allthingsthatfly.blogspot.com/2008/05/hobby-lobby-hacker-mini-reno-rac...

Category:

Science & Technology

Tags:

• hacker
• epp
• mini
• warbird
• rc

[dcanfielone]

I made a second mini, used the HXT 9g 3500kv motor. Right one? Pretty small. Anyway, I can't get enough thrust to get the thing to fly. It sinks and lands. I compared thrust to my first mini, and the first mini with the Potensky motor seems to have a lot for thrust. I've tried a few different props, no difference. Got any idea?

[elubb]

Prop mounted the right way? COG ok? Except for that, no, no idea. I used that motor in two different planes, a 120g shock flyer (Virus XS) and the warbird, and both planes flew ok (with a 400mah 2S lipo).

[dcanfielone]

Beware the Rarebear. The elevator servo, when mounted where shown in the directions, interferes with the right aileron. Maybe on the other versions as well? I wound up making a small cutout in the aileron to make it go around the servo. Receiver I put towards the front, in the bottom, similar to reviewer. The stupid prop I got from HL didn't fit, and when I tried to make it fit like the reviewer did, it broke. Got to go find what really needs to be done there. Hope to fly soon.

[elubb]

I had the same problem with the elevator servo, and came up with the same solution (cut some foam from the right aileron). Doesn't seem to affect flying though.

I did some tests with different props (multiplex 5x4, gws 6x3, gws 6x4). There wasn't much difference, so I decided to go with the smallest one. Had to drill it out a bit, and then had to use a small piece of paper to remove all play. Props and motors, always a bit of a problem...

[rotagen5]

Mine is going to be a machine for high winds. Its gonna be higher wing loading and way overpowered. I'll post something if it flies well.

[rotagen5]

I forgot to ask. HOw does this one do on a windy day.? I needed something tough and small for wind, so I ordered one. I guess if I fly fast enough I'll be OK.

[rotagen5]

9gm motor sounds too small. I would go with a 15-20 gm motor around 2000kV

[stevecoterell9]

your props miles to small is my idea

[dcanfielone]

And I find almost nothing on the prop/motor selection, other than you, and the review site. I have the Potensky 20W HL recommended (got it on sale). Am I OK with a 6X4 prop? The 4.9 X 4.3 HL said to use, does not fit in any way shape or form. I dry ran the 6X4, seemed OK for the short time I tried it, fast acceleration, though, resulted in a funny motor sound, kind if like slipping.

[elubb]

I have no problems with the COG, since I can change the location of the lipo.

The guy who did the review (press 'more info' on the right) put his receiver in front of the aileron servo. I think I would do that as well, since the RareBear has a shorter nose.