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Old Mar 27, 2006, 03:40 PM
registered foam addict
chara's Avatar
Munich, Bavaria
Joined Dec 2004
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Build Log
"Bipie" - Profile depron biplane cartoon style

PLANS AVAILABLE ON PAGE 4 OF THIS THREAD !


Hi guys, have been a bit lazy the past few months cause I restricted myself on just reading those interesting threads in this forum and letting them inspire me for new projects.
Time to give something back I think. So here is what I was designing a few time ago and finally managed to start the build....

The "Bipie" is designed for low wing loading and some nice and relaxed low speed flying, hence the bipe configuration. It will have rudder, elevaror and aileron control so I may be able to use it also as a moderate 3d trainer.

here come some pics of how I put everything together....
greetings
chara
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Last edited by chara; Apr 04, 2006 at 01:33 PM.
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Old Mar 27, 2006, 03:47 PM
registered foam addict
chara's Avatar
Munich, Bavaria
Joined Dec 2004
1,265 Posts
...here is the first drawing I made on the pc. might give you a better idea of how it is supposed to look like...

cu
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Old Mar 27, 2006, 04:01 PM
Crash Master
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Indianapolis, IN
Joined Sep 2001
16,632 Posts
It's a cutie! Hope to hear a great maiden report!

Short-coupled, lots of control surface and a short nose.... should be interesting
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Old Mar 27, 2006, 05:58 PM
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United States, MI, Chelsea
Joined Aug 2005
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Cool little plane hope she flies well for ya.
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Old Mar 27, 2006, 06:09 PM
aka RAMTech-RC
Chandler, AZ
Joined Aug 2005
516 Posts
Looks good to me. I love the Cartoon Fatties.
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Old Mar 27, 2006, 09:58 PM
Or am I...
Bournemouth, Dorset, UK
Joined Jan 2005
2,461 Posts
zoom zoom ^^
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Old Mar 28, 2006, 06:20 AM
gpw
“There’s no place like Foam”
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United States, LA, New Orleans
Joined Jul 2002
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Very COOL and FUN !!!!! One suggestion , the intersection of two lines at a sharp angle (bottom of fuselage aft of the canopy )gives worries to stress, and breakage ...a slight rounding of the intersection relieves such stresses, providing the plane doesn't break somewhere else ...hahahaa
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Old Mar 28, 2006, 11:24 AM
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chara's Avatar
Munich, Bavaria
Joined Dec 2004
1,265 Posts
Thanks everyone for your positive feedback and the tips.

I use two styrofoam pieces ("styrodur" to be more precize, that is the light blue stuff) of about 2cm of thickness and glue them along the fuselage. That increases stability of the overall construction and allows the use of two more struts to support the upper wing. These struts are reinforced with bamboo skewers on the leading edges and attach pretty nicely to the styrofoam. I wanted it to be rather solid in anticipation of some harder landings I produce on a regular basis.

Here we go with some more photos as the build progresses...
cu
chara
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Last edited by chara; Mar 28, 2006 at 11:31 AM.
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Old Mar 29, 2006, 12:04 AM
Registered User
Lake In The Hills, Il
Joined Jun 2005
359 Posts
chara,
Looking Good!
I know you are looking for "some nice and relaxed low speed flying"
Hope I am wrong again,But I bet you will have your hands full with this one.
Cool looking plane!
Please keep us posted!
windy city
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Old Mar 29, 2006, 04:30 AM
UH-60 Blackhawk TI
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Michigan, United States
Joined Feb 2006
176 Posts
I love it. Looks cool. I can't wait to hear how she flies. Good luck with your maiden. Do you plan on posting some plans for it in the future?

Hawk
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Old Mar 29, 2006, 01:17 PM
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chara's Avatar
Munich, Bavaria
Joined Dec 2004
1,265 Posts
Quote:
Originally Posted by windy city
chara,
Looking Good!
I know you are looking for "some nice and relaxed low speed flying"
Hope I am wrong again,But I bet you will have your hands full with this one.
Cool looking plane!
Please keep us posted!
windy city
Thanks windy city!
I can't wait to maiden it. I'll start with small surface deflections, forward CG and quite some expo to see how it behaves in the air. Later I'll go fo the "envelope expansion test flights"

The upper wing ailerons by the way are still fixed. If I find out that more roll power is needed for the crazier stuff, I'll connect them to the lower wing ailerons.

greetings
chara
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Old Mar 29, 2006, 02:01 PM
registered foam addict
chara's Avatar
Munich, Bavaria
Joined Dec 2004
1,265 Posts
Quote:
Originally Posted by hawk4932
I love it. Looks cool. I can't wait to hear how she flies. Good luck with your maiden. Do you plan on posting some plans for it in the future?

Hawk
Hawk, thanks for the kind words.
If the weather gods allow, I might be able to maiden her on Saturday. Right now it is rather rainy/windy here in Munich.

If the maiden flight is successful and if someone out there shows interest in building his own Bipie, I will be pleased to post the plans in this thread (free for everyone of course ).

greetings
chara
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Last edited by chara; Mar 29, 2006 at 02:33 PM.
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Old Mar 29, 2006, 02:30 PM
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chara's Avatar
Munich, Bavaria
Joined Dec 2004
1,265 Posts
Here is another build-detail that might be of interest for some of you.

It is a technique that I use to connect surfaces (depron sheets) that are perpendicular to eachother (it also works with other than 90° angles).
Glueing together two surfaces in a 90° angle often gives not enough stability
because of the small contact surface.
I stabilize these kind of connections with integrated balsa or plywood reinforcements. I found out that CA works extremely good on wood. So I CA-glue together two balsa/plywood strips of about 40x6x1 mm to form a T-shape (the ca bond is ultra strong).
Then I cut a slit right through the depron surfaces that have to be connected and squeeze in the wooden T-reinforcement. Of course you should apply some "uhupor" on the T-piece before you squeeze it in and also on all the rest of the contact surfaces. "seal" the slits with clear tape.

This method increases the strenght of perpendicular bonds signifficantly. It works great and is easy to do!

I hope the following pics explain it better than I can do with my poor english...

good night
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Last edited by chara; Mar 29, 2006 at 03:28 PM.
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Old Mar 29, 2006, 04:15 PM
Glider guider
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United States, FL, Sun City Center
Joined Oct 2005
359 Posts
Oh...... I LIKE it! I think I'm gonna have to have one of these! It's going to need some expo' to tame it enough for me, but that's easy enough. Good Job Chara.
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Old Mar 29, 2006, 06:45 PM
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Joined Mar 2006
895 Posts
Hey, How big is that thing? Its cute so I assumed it was small...
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