Scratch Built Giant Foam RC Biplane - RC Groups
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Dec 06, 2009, 11:26 PM
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Scratch Built Giant Foam RC Biplane

I have just finished building a giant foam RC Biplane. This is actually a giant scale version of a plane I have designed and build in many different sizes. It is without a doubt the slowest outdoor plane I have seen with the exception of 3d planes in harrier or hover.

When I finished the plane I found that it needed a bigger propeller to be efficient at the speeds it would travel. I could not find the prop I wanted so I carved one out of poplar from home depot. I dropped the voltage from 6 cells down to 3 cells and propped up.

The plane has an 80 inch span, an 8 foot length and sits over 2 feet high. It flies right now on only 600 watts max on a 3 cell lipo pack. The motor flying it is only a 40 sized Turnigy 42-60 from Hobby City.

About 15 amps or 150 watts are necessary to maintain flight. It lifts of and climbs easily on 250 watts.

Total weight with 2 4000 mah 3 cell packs in parallel is about 8.2 lbs. Total area is 3520 inches square or 24.4 sq ft.

I am posting pictures below and will post some video of early flights tomorrow.

Last edited by mtiegs; Dec 07, 2009 at 08:06 AM.
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Dec 07, 2009, 05:33 AM
Flying Half Pound and Down
DaOldGuy's Avatar
Originally Posted by mtiegs
I have just finished building a giant foam RC Biplane. This is actually a giant scale version of a plane I have designed and build in many different sizes. It is without a doubt the slowest outdoor plane I have seen with the exception of 3d planes in harrier or hover.
Well I really like Bi Planes and there is a LOT of Bi Plane there to love. I would really like to see the video. I seen a 80 inch Pro Bro last night, now a Bi Plane, Bigger must be the new cool these days.

Very nice!
Dec 07, 2009, 06:10 AM
If it flies, I crash it!
dlazarus6660's Avatar

Luv it!

I luv it, got plans?

For the elevator, add on the tabs that are on the Fokker DVII or DR1. I think that would look kewl!

Dec 07, 2009, 07:56 AM
Registered User
Luv the size! How have you built the wing? It looks like two layers of depron or FF formed into an undercamber
Dec 07, 2009, 08:01 AM
Registered User

Video from first flights

Here is a link to some video on youtube:

SlowBipe (2 min 58 sec)

New definition to "Low and Slow".

Dec 07, 2009, 08:15 AM
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Dragevo's Avatar
Wow, that's awesome - it flies soooo slow & steady. Hmmm, I'm sure it could carry a HUGE cam...
Dec 07, 2009, 08:25 AM
Registered User
Total weight is about 8.2 lbs. I haven't tested carrying capacity, but expect it could lift at least 5 lbs more. I know the wings can handle it and there is plenty of lift.

I am going to try setting it up to tow a billboard. I think it would be more of a lift than a tow at these speeds.
Last edited by mtiegs; Dec 07, 2009 at 08:33 AM.
Dec 07, 2009, 08:37 AM
Registered User
The lower wing is just fanfold foam with a leading and traling spruce spar (1/4 x 1/4).

When I got to the upper wing I used 1/2 Dow foam insulation. In order to get the undercamber I releaved material from the underside. This stops it from snapping when you roll it.

Most of the plane is made out of th 1/2 inch Dow foam. 2 full 4 x 8 foot sheets were purchased from Lowe's.
Dec 07, 2009, 01:16 PM
Caster Of Pods
Crash Hancock's Avatar
This plane is so wicked awesome!! I've watched the video several times just because it is so amazingly slow that I can hardly believe it! LOL

Thanks for sharing this!
Dec 07, 2009, 03:47 PM
Registered User
Thanks crash-man for the compliments. It really is wickedly slow. My smaller versions of this plane have a much larger flight speed envelope. I can slow them down to a crawl, or speed them up to about 28 mph. This plane seems to max out at about 15 mph due to drag. The smaller version will also do massive loops and unlimited vertical. Hammer Head stalls are great as well. I love the power of brushless motors.

I had a group of 25 kids at a picknic chasing this plane around the park for 15 minutes. They would try to catch it. I would fly it around just 10 feet in front of them just so they would not catch it. I would then bolt up into the sky in a loop and come back down behind them. Everytime I put this plane into the air, kids try to chase it.

The small version runs on about 110 watts max, has a 28 inch wingspan and has a weight of about 11 oz. It will cruse around on 3 amps with a 3 cell battery. The middle size has a 38 inch wingspan and has a weight of 20 oz. I think the 38 inch span is the slowest, but he 28 inch version can handle a lot of wind. I have flown in gusts to 15 mph on this 11 oz Bipe.
Dec 07, 2009, 04:00 PM
Storm Runner guy
Slider2732's Avatar
Another moment of "oh my word that is simply incredible!".
Really, it just sits in the air waiting for you to tell it to move forward
I particulalry like your wing connectors right at the end points. Gives a very sleek and strong visual this size you can plainly see the undercamber slottings.

Very very nicely turned out crowd pleaser...offline and online
Dec 07, 2009, 07:15 PM
Registered User
Thanks slider. slotting the wing on the underside was definitely time consuming.
Dec 07, 2009, 07:54 PM
My plans are in my blog
Rusty-Gunn's Avatar
This is the slowest large plane I've ever seen. I love how slow it goes. Simply incredible.
Dec 07, 2009, 08:05 PM
Lost but making good time

That airplane is mesmerizing, absolutely mesmerizing!


Dec 07, 2009, 10:27 PM
Registered User
Murman's Avatar
Absolutely amazing!! I used to be in awe of the "Pink Floyd", but even though your plane is much smaller, the styling and slow speed make it my new favorite. Congratulations on a great design. Gonna have to build one of those one day.
24 foot wingspan Pink Floyd RC Foam airplane (4 min 40 sec)

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