Colibri MB-2 (oz9786)

 

Colibri MB-2 (oz9786) by Franz Meier from RCMplans 1976 - plan thumbnail

About this Plan

Brügger Colibri MB-2. Radio control scale model, for .61 power and 4 channels.

Quote: "The Colibri MB-2 is ideally suited for a scale model. With exception of the wing aspect ratio, all dimensions are perfect for a model and also the general impression is that of a scale model of the new generation. As with the Turbulent D-31 (oz8216) I was very lucky to get a set of the original blueprints and the authorization to shoot as many pictures of the original as I liked. The home base of the plane is in Western Switzerland, about a 3 hour drive. To avoid this lengthy trip, the designer and owner of the original aircraft flew the MB-2 to a close airfield, where I could study it in detail and ask all the necessary questions. I appreciated this very much, since it is much more difficult to get adequate data for a scale model than to actually build it.

The scale of 1:3.33 was chosen again, as with the Turbulent, since this kept the span below 2m. It is certainly an unconventional scale, but relatively easy, because you can multiply every dimension by .3 to get the scale dimension. Especially for the relatively small home-built aircraft I consider 1:3.33 to be a good scale, 1:3 would produce a relatively large, and 1:4 a small, aircraft. For the Colibri the wing span would have been 2m (78.7in) and 1.5m (59in) respectively. The model is built from the same material as the original, with some exceptions. The fuselage and wing are mainly constructed from plywood and spruce, while balsa mainly was chooser, where possible, to reduce weight.

The development and construction time for this model was approximately one year. This time has to be considered as relatively short, because a lot of time has to be spent in jigs and tools as well as samples. There were 4 dies produced for the MB-2, namely for the canopy, the engine cowl, the wheel cowls and the spinner. The original airplane is equipped with the NACA 23008 airfoil (like many well-known WW II fighters). All the ribs are assembled in a jig from 2 x 4mm spruce. Even with the higher specific weight of the spruce, a comparison of a block of balsa ribs with the same number of fabricated rib showed practically no difference. The major difference is the manufacturing time, on the other hand I could stay with the original construction method. The ailerons on the original plane use Abachi-plywood ribs, so I decided to built the ailerons of the model entirely from balsa. Also the box design of the main spar was kept, however balsa was used instead of spruce due to the weight..."

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Colibri MB-2 (oz9786) by Franz Meier from RCMplans 1976 - model pic

Datafile:

ScaleType:
  • Brügger_Colibri | help
    see Wikipedia | search Outerzone


    ScaleType: This (oz9786) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.

    If we got this right, you now have a couple of direct links (above) to 1. see the Wikipedia page, and 2. search Oz for more plans of this type. If we didn't, then see below.


    Notes:
    ScaleType is formed from the last part of the Wikipedia page address, which here is https://en.wikipedia.org/wiki/Brügger_Colibri
    Wikipedia page addresses may well change over time.
    For more obscure types, there currently will be no Wiki page found. We tag these cases as ScaleType = NotFound. These will change over time.
    Corrections? Use the correction form to tell us the new/better ScaleType link we should be using. Thanks.

Colibri MB-2 (oz9786) by Franz Meier from RCMplans 1976 - pic 003.jpg
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Colibri MB-2 (oz9786) by Franz Meier from RCMplans 1976 - pic 004.jpg
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  • Plan File Filesize: 4350KB Filename: Colibri_MB-2_RCM-650_oz9786.pdf
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Notes

* Credit field

The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.

Scaling

This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.

 

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