Colibri MB-2

 

Colibri MB-2 - plan thumbnail image

Colibri MB-2 - completed model photo more pics (2)

Colibri MB-2  
by Franz Meier
from RCMplans (ref:650)
July 1976 
71in span
Tags: Scale IC R/C LowWing Civil
all formers complete :)
got article :)


This plan was found online 06/02/2018 at: https://www.rcgroups.com/forums/showpost.php?p=39121195&postcount=7811
Outerzone planID: oz9786 | Filesize: 4350KB | Format: • PDFbitmap | Credit*: davidterrell80

   

About this Plan

Br├╝gger 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..."

Supplementary files

Article pages.

Corrections?

Did we get something wrong with this plan? That happens sometimes. Help us make a correction

 

User comments

No comments yet for this plan. Got something to say about this one? Click here to Add a comment

 

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.

 

Terms of Use

© Outerzone, 2011-2018.

All content is free to download for personal use.

For non-personal use and/or publication: plans, photos, excerpts, links etc may be used, provided that full and clear credit is given to Outerzone with appropriate and specific direction to the original content i.e. a direct hyperlink back to the Outerzone source page.

Unauthorized use and/or duplication of this material without express and written permission from this site's owner is strictly prohibited. If we discover that content is being stolen, we will consider filing a formal DMCA notice.