GH 20 (oz4136)
About this Plan
GH 20. Wakefield competition rubber model.
Quote: "THIS machine was designed for duration competitions including those run under Wakefield rules. As will be seen from the drawing it is a simple and straight-forward job, which is an important consideration these difficult days. it is, however, strong and reliable.
The original model was first flown in 1942, when it was entered in some local competitions, where it won the Midwood Challenge Cup and Farnborough Trophy.
Owing to the local club temporarily ceasing operations, I decided to try my luck with GH.20 at Epsom in Blackheath's Gala Day. It won first place in the open duration event. This win spurred me on to have a try at a National Competition, so I entered the 1943 ME No.2 Cup competition; this it won with two flights, the second was OOS..
It is not, I think, necessary to describe the model in detail since its construction follows orthodox practice. The following remarks may help anyone desirous of building it.
1. The machine will fly in pretty foul weather, so it is worth double covering the fuselage, also use a good quality dope.
2. The tail plane ribs are slightly cambered, so you must stick the covering to the ribs, underside only, of course.
3. A small amount of flight trimming can be done by inserting narrow strips of paper between the tail unit plug and the near end of the fuselage.
The Airscrew WP Type: Carve from soft balsa, develop the blade with care from the shaped block. The blade should be as thin as you dare make it towards the tip. Reinforce the leading edge and tip with one or two coats of hard drying cement. Use a non-shrinking dope such as banana oil on the blade, this will avoid the possibility of distorting the blade. If the hinge arms are made sufficiently flexibte, it is possible to get a variable pitch action, within certain limits, of course. The blade assuming its maximum angle, ie coarse pitch position at the beginning of the flight, then returning back, progressively to its original position (fully fine) as the torque diminishes.
Stops to prevent the blade reaching excessive angles were not found necessary when using motors consisting of 14 or 16 strands of 1/4 in by 1/24 in black rubber.
This flexibly-mounted blade . type of airscrew has proved itself to be well worth further experiment. I have made repeated tests with this particular airscrew in comparison with my fixed pitch types, and I am sure it is superior, inasmuch as the model continues to climb where before, with a fixed airscrew, it would have levelled out.
In conclusion, I would add that I quite realise the limitations of the airscrew described, but I do regard it as a step in the right direction. "
Quote: "This time we go to the June 1944 AEROMODELLER where another delightfully atmospheric C.RUPERT MOORE cover painting shows the G.H.20 Wakefield in full flight high above, in England’s wartime skies... to the model on the cover the G.H. 20 WAKEFIELD that first flew in 1942. Designer G.W.W. HARRIS said 'It is a simple and straightforward job that is both strong and reliable'. It has already won local competitions."
Supplementary file notes
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
by GWW Harris
all formers complete :)
got article :)
Found online 18/03/2013 at:
Format: • PDFbitmap
Do you have a photo you'd like to submit for this page? Then email firstname.lastname@example.org
User commentsNo comments yet for this plan. Got something to say about this one?
Add a comment
* 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.
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.
© Outerzone, 2011-2019.
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.