AJEP Wittman Tailwind (oz7831)

 

AJEP Wittman Tailwind (oz7831) by Peter Holland from Radio Control Scale Aircraft 1996 - plan thumbnail

About this Plan

AJEP Wittman Tailwind. Radio control scale model. 39in wingspan sport scale model designed by Peter Holland for light 3 function R/C and 0.75cc diesel or .049 glow motors.

Quote: "Build this design for a light, three-function WC sports model. The Wittman Tailwind, by Peter Holland.

One look at the side view of the Wittman Tailwind two-seater was enough to inspire this builder. Electric was the first idea, then he looked at the diminutive wing area, and realised that even with today's light nicads, a little diesel would serve the purpose quietly inside the capacious cowling.

Yes, yes, yes! That smooth side view with the almost aerofoil shaped cabin top-cum-windscreen. The lean, lean back undercarriage. The flat looking cowling. It's all 'get up and go'. I got up and went for it. Just a minute: the front view looks wide. That's because the wingspan is on the short side. Well, it is a racer, albeit one with a side-by-side seating arrangement, and from a modellers' point of view, a doddle to model; thanks to the box-type rear fuselage.

I am old fashioned. I prefer a reasonably light wing loading on almost anything that flies. I cheated a wee bit. The fuselage is one-eighth scale and the flying surfaces at the slightly larger scale of seven and a quarter to one, with the resulting loading of about 10 or 11 ounces per square foot.

There is so much cabin glazing around that vital wing attachment area, that the one piece wing, chosen for ease of aileron linkage, cannot separate in the usual manner. The windscreen, and rigid 2 mm styrene side glazing pieces, are integral with the centre section, and the whole unit is retained by a self tap screw at the front and two dowels at the rear.

Any other method would have made those slim glazing bars far to bulky for scale, and prone to wear and damage. You can now see right through all that glazing. Then, with the screw removed, lift off the cabin, there is room for a dance in there; unobstructed access. That's another thing to its credit.

Sticks and paper. The fuselage frame is 3/16 square medium strip over the side view part of the plan (suitably rubbed with candle wax where the joins go). Put pins each side of the strip longerons to coax them to the bottom curve, and gusset well with 3/16 sheet at the tailplane step.

Add the diagonal 1/8 x 3/16 braces. Sheet where shown with firm 1/16 sheet. Remove when dry, and make a second side with the sheet on the opposite side. Pin the un-sheeted frame to the sheeted one while you do this, to avoid the bare second frame becoming distorted, once it is off the board.

Make up the formers F2 and F3 from strip overlapped, and cut Fl and the engine mount from 3 mm birch ply. Epoxy the latter pair together.

Assemble the sides, sheet outwards over F2 and F3. Use a set square to get it true. Pull the tail ends together and hold them with a spring clothes peg. add the four bottom cross pieces in the cabin area. Do not add any cross pieces aft of F3.

Now slice diagonally through the longerons at F3 and allow them to form a straight line to the tail. Wick cyano into these joins. Add the rest of the cross pieces top and bottom.

Assemble the cowling front from four pieces of 1/2 in square, when dry, pull the sheet sides forward of F2, into contact with 11 and the cowl front. Add triangular strip top and bottom, cover the bottom with two pieces of 3/16" sheet; shorter on the starboard side for cooling.

Shape the opening in the cowl front to clear the prop driver and fuel proof with PVA. Mount the engine, mine is a Mills .75 replica, quiet enough to be silenced by the cowling alone, Make a small tank from tinplate or 5 thou sheet brass and tube. Test by blocking these and putting in hot water. Bubbles show if there are leaks.

Add rubber or neoprene fuel tubes (if yours is a diesel too). Now fuel proof the tank bay and install the tank. sheet the cowl top with 3/32 medium, and add the blister shapes from 1/8 sheet chamfered all round before gluing. Cut along the cowl hatch lines for access to the engine and reinforce the piece you took out Make a wire clip to go over the cart or cylinder and fix it with cyano. Bend it about until the hatch holds firmly, then add bits of thin ply to form stops. Remember to fuel proof these new parts with more PVA. Now break off to sort out the undercarriage..."

Direct submission to Outerzone.

Update 28/03/2017: added article, thanks to RFJ.

Supplementary file notes

Article.

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

AJEP Wittman Tailwind (oz7831) by Peter Holland from Radio Control Scale Aircraft 1996 - model pic

Datafile:
  • (oz7831)
    AJEP Wittman Tailwind
    by Peter Holland
    from Radio Control Scale Aircraft
    June 1996 
    39in span
    Scale IC R/C Cabin Civil
    all formers complete :)
    got article :)
  • Submitted: 16/06/2016
    Filesize: 538KB
    Format: • PDFbitmap
    Credit*: JoeFergusson, Poacher

ScaleType:
  • Wittman_Tailwind | help
    see Wikipedia | search Outerzone


    ScaleType: This (oz7831) 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/Wittman_Tailwind
    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.

AJEP Wittman Tailwind (oz7831) by Peter Holland from Radio Control Scale Aircraft 1996 - pic 003.jpg
003.jpg
AJEP Wittman Tailwind (oz7831) by Peter Holland from Radio Control Scale Aircraft 1996 - pic 004.jpg
004.jpg
AJEP Wittman Tailwind (oz7831) by Peter Holland from Radio Control Scale Aircraft 1996 - pic 005.jpg
005.jpg

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):
  • AJEP Wittman Tailwind (oz7831)
  • Plan File Filesize: 538KB Filename: Ajep_Wittman_Tailwind_39in_oz7831.pdf
  • Supplement Filesize: 2513KB Filename: Ajep_Wittman_Tailwind_39in_oz7831_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, 2011-2019.

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.