Little Willie MkII (oz7840)

 

Little Willie MkII (oz7840) by Stuart Howard, Bruce Edwards 1971 - plan thumbnail

About this Plan

Little Willie MkII. Rubber indoor model.

Quote: "The 'Easy B' type of model makes an ideal beginners introduction to indoor modelling as well as being a great 'fun' model for the mode reperienced. As it is capabale of flights in excess of ten minutes, it is certainly not a toy.

To keep the competition class within reach of the tyro, we have stuck to the spirit of the original rules, that is:

1. Maximum wing span 18 in flat, not projected.
2. Maximum wing chord 3 in.
3. No curved surfaces or spar bending rectangles only.
4. Tissue covering only - no microfilm.
5. No bracing.
6. Solid motor stick, tail boom and prop blades.

Stewart and I got together on the design while looking for a suitable project for young nephews, and have been pleasantly surprised at the perform-ance of the models built. Over the past three months my model has been used to give flying exhibitions in schools and youth clubs and is still going strong. The only difference being that the rudder has been mounted upright in front of the stab to save it from damage in cluttered rooms.

The Propeller: This is the most important part of any rubber model, so we will start here. If this is a first model, the easiest way to make a propeller is to cut out two blades and a spar. Bend the prop shaft and cement to the spar. Line the shaft up vertically and glue on a blade at 45° in such a way that the front of the blade on the left hand side of the spar slopes upwards towards you, then glue on the other blade to the right hand side so that the back slopes downwards. When the propeller turns anti-clockwise you should feel a draught on the same side as the shaft.

For the more experienced or ambitious builder a jig is carved from block, as shown on the plan, the blades soaked for a few minutes in hot water, then individually strapped to the jig with strips of tissue and baked in a cool oven (Regulo 1/4) for 10-15 minutes. When both blades are dry and shaped, one is laid on the jig with the datum lines corresponding and the prop spar glued in place, so that the shaft is vertical and parallel to the corner of the jig. Use white PVA glue for this job, using as little as possible. When dry, remove and repeat for the other blade.

Wing and Tailplane: To cut ribs to shape you need a template. Either trace the rib curve from the plan on to a piece of 1/32 ply or find an old 12 inch record or dish which you can cut round. Make the compression rib as shown on the plan. If you use the arc section the upright must be in the middle. Templates can be used for building round. These are best made by tracing the inside lines on to card or balsa sheet and cutting out. It is best to cut a 'V' in the template where the ribs go, so that the ribs can be glued in over the former. Cut ribs from a rectangle of 1/32 sheet 3 inch wide. The same section is used for both wing and stab. Ribs are trimmed to length from the trailing edge.

It will be noted that the port wing panel is longer than the starboard. This is because indoor models turn with the motor torque to the left, and this provides more lift to the inside wing, enabling the model to turn tighter..."

Direct submission to Outerzone.

Update 04/07/2016: article pages, text & pics added, thanks to RFJ.

Supplementary file notes

Article pages, text & pics.

Corrections?

Did we get something wrong with these details about this plan (especially the datafile)? That happens sometimes. You can help us fix it.
Add a correction

Little Willie MkII (oz7840) by Stuart Howard, Bruce Edwards 1971 - model pic

Datafile:
  • (oz7840)
    Little Willie MkII
    by Stuart Howard, Bruce Edwards
    from Aeromodeller
    April 1971 
    18in span
    Rubber F/F
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 16/06/2016
    Filesize: 184KB
    Format: • PDFbitmap
    Credit*: JoeFergusson, Poacher
    Downloads: 991

Do you have a photo you'd like to submit for this page? Then email admin@outerzone.co.uk

User comments

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

 

 
 

Download File(s):
  • Little Willie MkII (oz7840)
  • Plan File Filesize: 184KB Filename: Little_Willie_Mk_II_oz7840.pdf
  • Supplement Filesize: 730KB Filename: Little_Willie_Mk_II_oz7840_article.pdf
  • help with downloads
 

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, 2011-2024.

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.