Baby Blender Cabane Conversion?

by alibopo | October 21, 2014 | (7) Posted in Just Fun

Baby Blender Wire Cabane Conversion

UPDATE 28/03/2015 - I've been collecting and updating all my articles, planes and plans on my own website on this page; RCplanes It's still a work in progress, but there's a few extras and beta-stage projects that don't appear here on the Flite Test website yet.

This article is a quick response to 'Bayboos' who has been producing some very nice evolutions of the Baby Blender. We discussed cabanes for the Baby Blender, and it was fairly easy to work out a possible scheme.

UPDATE - 31/08/2016 - Based on the longevity of my AVRO 539b biplane this 'original' BB design using saddle mounts embedded in the fuselage sides is a bit of overkill, and very fiddly. A much simpler method for holding the cabanes down is shown in the 'modified' plans for the SE5 [link below] and in the image just below. I'll get around to modifying the BB plans in this article, but all the basic dimensions are correct, you just need to omit the saddle and side bars, and use this newer method. My only reservation about the BB with this conversion is the bottom wing. To maintain strength, I think it would be better to cut a fitted recess in the fuselage rather than cutting slots in the top of the wing.

The wing is held down by elastics over the ends of the top bars. On recent biplane builds Polikarpov PO2/U2 and SE5 I used little triangular 'foam board' corners on the underside of the top wing, which located neatly into that rectangular gap at the top of the frame.

The music wire I have been using is 3/32" or 2.38mm or around 13 SWG... whichever you're familiar with. In the above image and the downloadable plans, dont bother with the two little 56x30 saddles.

Here's a link to the PDF for the full size images; BabyBlender wire cabanes & interplanes

Cheers, alibopo.

COMMENTS

Bayboos on October 21, 2014
Thanks :)

One thing though. For aesthetic reasons, I would like to go with fuselage struts parallel and in the same pattern as wing struts: starting from the upper wing's leading edge, going down and back to the place just in front of forward cockpit, then back up to wing's training edge, then back down to the second cockpit. It seems that this will look much better than the pattern from your picture (opposite direction, angles not alligned).

But other than that, I'm starting to build this thing right now!
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alibopo on October 21, 2014
Aesthetics, very important! I'm sure it will look great :) For my solution I copied the PO2 layout and went with the logical real life 'load bearing' arrangement. Double strut near the wing's centre of lift (if that's what it's called), and a single strut to manage the smaller forces nearer the back of the wing.
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Willsonman on October 21, 2014
This is great stuff. As a technicality, the struts at the wing tips are called IP (inter plane) struts. Cabanes are from the fuselage to the wing only. IP struts are designed to transfer lifting and landing loads. Even the struts on a cub are cabanes as they attach to the wing and fuselage transferring the lifting load of the wing to the fuselage during flight and the landing load during... landing. This nomenclature derives from pre-WWI and WWI era aircraft designs, primarily from the French influence.
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alibopo on October 21, 2014
Thanks! You learn something new every day :) Interplane struts, I'll remember that. Cheers.
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Baby Blender Cabane Conversion?