Micro profile biplane - RC Groups
Thread Tools
Feb 12, 2005, 12:59 PM
Model Designer
keven64's Avatar

Micro profile biplane

Inspired by the many varied 3D foamy models that can be seen within this forum, I have today been creating one of my own - for my Feigao BLIPS with DXA B-ratio gearbox.

Wingspan is only 20 3/4"
The propeller in the picture is an 8043.
Interplane struts from balsa will be added after the colour trim.

Sign up now
to remove ads between posts
Feb 12, 2005, 01:19 PM
Model Designer
keven64's Avatar
The model is all 3mm depron - but for the vertical fuselage component - which is from 6mm depron, and the rudder - which is ex foamboard, and 5mm thick.

The the output shaft of a GWS DXA gearbox is offset 3mm from the face of the stick onto which it is pushed.

This I used to my advantage, and have stuck the motor stick directly to the right hand side of the fuselage, bringing the thrustline right onto the centreline of the profile fuselage.

Four Tower Pro 5g servos are now fitted, along with Phoenix10 and a GWS Naro6 receiver.
Weight with a 2S-750 lipo in the slot over the lower wing... but with no colour trim or undercarriage, is only 6oz.

More pics after I make the control connections.

Feb 12, 2005, 01:25 PM
Krued Up
snolord1's Avatar
Good job Keven,looks good.Can't wait for the finished product....keep us posted.

Feb 12, 2005, 05:09 PM
dougmontgomery's Avatar
Great work! keep it up....Doug
Feb 13, 2005, 01:17 PM
Registered User
SebastianS's Avatar
Nice biplane But I think it's a little bit to heavy...
For comparison only, this is my Miniulti.

Wingspan 45cm (ca. 17 3/4")
weight: 83gr (ca. 2 7/8oz)
motor: CDR with an 6x3" GWS

With this weight it flys very good include all 3D aerobatics. The same biplane with 50cm (20") and 125gr (4 3/8oz) was not so good in aerobatic. Only thing what it could better than the new one was flying when it was windy.
Feb 13, 2005, 04:03 PM
Model Designer
keven64's Avatar
SebastianS commented
Nice biplane But I think it's a little bit to heavy...
Me too

Wow - that is light.

Nevertheless I will fnish it, and see how well it goes.

The Feigao is a very capable little motor - and I am a rather incapable '3D' pilot. Between the two I might manage to have it going rather well within the flight envelope I can cope with...!

It looks like the model will weight about 7.5oz when done - this motor and gearbox can easily manage that with the correct propeller. A 9070 will make for very interesting flying at almost 7oz static.
I'd better buy new bicycle clips...

Feb 13, 2005, 07:13 PM
Registered User


Looks cool keven64. I like your size. My snoopylution is 28 span. AUW is 7.4 with the Fiego in a B gear box with a 450 3cell. Great flyer.....
Feb 14, 2005, 02:05 AM
Model Designer
keven64's Avatar

I love the Snoopylution ! I originally had my B ratio BLIPS in a 24" monoplane, HERE, and thought that going smaller would be prudent.
Perhaps I was wrong ?

I have only a pair of 2S-750's with which to play at the moment; I'll bet that these are the same weight as your 3S-450's... at only 1 1/4oz each ?

There's the upgrade, before I even begin flying...

Feb 14, 2005, 03:31 AM
Model Designer
keven64's Avatar
Previous to the 24" model in the above link, I made a monoplane of 28" - which flew GREAT, but was rather fast !

I think my next will be another bipe of the same size as the Snoopylution

Lower wing loading = slower flying...

Feb 14, 2005, 02:20 PM
Registered User
SebastianS's Avatar
hi Keven,

pay attention to the 0970, its very big for a such small plane...
Mine had an 0630 and the old one (the bipe with 20") had an 0845. The 6" is a bit to small for easy torque rolls, but the 8" had almost to much torque, so if you accelerate to fast it made a 1/4 roll

@stringlfy: the design on your snoopylution looks cool is it airbrushed?
Feb 15, 2005, 02:32 AM
Model Designer
keven64's Avatar
I did say "interesting"...

Feb 15, 2005, 02:58 PM
Registered User
SebastianS's Avatar

Feb 15, 2005, 03:54 PM
Sussex, UK
RobinBennett's Avatar
> Nice biplane But I think it's a little bit to heavy...

It'd be fine outdoors, but rather fast indoors.

I extended the chord on my bipe to about 9 inches (it has a 23 inch wingspan) - it looks cartoonish but it's the slowest flyer at the indoor events I attend and weighs about 5.5oz - wing loading is about 2oz/sqr foot

I wish I could manage to build an 83g plane - that's amazing. My lightest battery and CDR would be half of that on their own.
Feb 15, 2005, 03:58 PM
Registered User
SebastianS's Avatar
battery + CDR are around 29gr

Feb 16, 2005, 03:41 AM
Model Designer
keven64's Avatar

I have nowhere to fly indoors...
Unless you count the living room - which the missus does not !


What specs is your lightweight CDR ?
It's not one of those 10g motors from Stout-Aero... or is it ?
Stout Aero 10g motors

I rewound a gobrushless CDR yesterday morning with 14T of 26awg in three colours - Wye.
It goes great on 2S with a 6" x 4" prop.
I'm not sure it is suitable for anything like this biplane - even a smaller one - but I do have an idea for something...

Last edited by keven64; Feb 16, 2005 at 03:59 AM.

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion micro ultrix biplane widgeteer Scratchbuilt Indoor and Micro Models 14 Jan 22, 2006 10:28 PM
Hobbico FlyZone Micro Ultrix Biplane EP RTF Dave Lauck Product Announcements 0 Jun 27, 2005 02:57 PM
help on Profile Biplane nickrage Foamies (Kits) 21 Jun 13, 2004 11:42 PM
Micro Ultimate Biplane video. WOW!!! Zero Six Sierra Parkflyers 3 Nov 06, 2002 05:33 PM