Slingsby Prefect (oz13035)

 

Slingsby Prefect (oz13035) by Keith Humber from Radio Modeller 1994 - plan thumbnail

About this Plan

Slingsby Prefect. Radio control scale model glider.

Quote: "A traditional all-wood vintage glider at 1/5th scale. Slingsby Prefect, by Keith Humber.

Having designed and built a near 1/3rd scale Prefect in the early 80s which was a lovely old aeroplane to fly, being very scalelike in appearance in the air, I wondered if I could reduce the size down to a more manageable 1/5th, which would work out about 104 in span. The bigger model was 150 in and as I get older and more wrinkly it becomes a littler harder to transport and launch. Hence the 1/5th scale!

I had the good fortune to contact the Vintage Glider Club's Ron Tarling who was very helpful and sent me photos of both their Prefects. One has a red and white colour scheme, which appealed to me, as did the logos, etc. Thanks Ron, it was very useful, so much so that I have modelled your red machine, which I believe was the original prototype Prefect. Note the rounded top to the fin and slightly narrow fuselage. I have included the pointed nose, which the VGC incorporated, by blowing a chicken's egg and fibre glassing over same! It looks good - at least I think so.

Flying-wise the smaller machine is very good being quite realistic and a doddle to launch and fly. It does need a bit of lift but then so do a lot of this type of scale gliders. Anything from force 2 up to 6 fine - over 6, you're on your own! Loops, stall turns, spins and rolls (I know the full-size wouldn't, but they do look good), rolls off the top even, or sedately flying along the slope, are all within the model's capabilities.

Let's start: The construction is most straightforward, the only tricky parts are the wing mounting centre section and the air brakes - they are very tricky indeed! It took me a couple of weeks of fiddling to get them to work satisfactorily. I think, in hindsight, I would have accepted the non-scale commercial manufactured brakes and fitted them. I strongly recommend that you fit commercial Schemp Hirth style brakes - mind you, if you have the patience then the scale brakes do a super job. On landing they really push the model down on the ground with a very satisfying roll to a stop, very scale.

However, enough chit chat, on with a brief description of the finer points of construction. The fuselage is built using a 1/8th sheet basic box. Fuselage sides are doubled tip with a second 1/8th lamination at the cockpit area. This is glued on the outside of the basic box. The rear section is longeroned and spacered with 1/8 x 1/8 false longeron spacers. You cut the basic fuselage side from balsa sheet and frame up onto 1/8 ply formers before fixing the rest of the nose sheets plus false longerons, etc... "

Slingsby Prefect, Radio Modeller, April 1994.

Direct submission to Outerzone.

Supplementary file notes

Article pages, thanks to RFJ.

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Slingsby Prefect (oz13035) by Keith Humber from Radio Modeller 1994 - model pic

Datafile:
  • (oz13035)
    Slingsby Prefect
    by Keith Humber
    from Radio Modeller
    April 1994 
    104in span
    Glider R/C
    all formers complete :)
    got article :)
  • Submitted: 05/04/2021
    Filesize: 940KB
    Format: • PDFbitmap
    Credit*: Circlip, RFJ

Slingsby Prefect (oz13035) by Keith Humber from Radio Modeller 1994 - pic 003.jpg
003.jpg

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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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