Twinster (oz4886)


Twinster (oz4886) by Claude McCullough from Air Trails 1947 - plan thumbnail

About this Plan

Twinster. Claude McCullough's Twinster from Air Trails magazine issue 06-47.

Quote: "A thermal hunting rubber powered job for summer flying. Although it may seem so at first glance, you are not seeing double. Originally plotted as a scheme to pack more power into a rubber job for a skyrocket climb to thermal-grabbing heights, the 'Twinster' has proved to have several other advantages as well. Not the least of these is the pleasure of having a ship that is really different and strictly not run-of-the-mill.

The prototype of this plane, a 350 sq incher, was built back in pre-war days and was just beginning to show its potentials when, at a big contest of all places, one of the motors was inadvertently wound backward, producing an inglorious belly flopper and a bashed-in nose on one of the fuselages. Our vacation with Uncle Sam intervened before further work could be done with it and by the time the author got back to the workshop, the time and tide of several years had taken its toll. So when the rubber with a real snap became available again, it was decided to build a new version.

One item of interest is the high power resulting from the twin construction. The splitting of the mnotor into two units permits a greater motor run duration, due to the increased number of winds. For a desired amount of power output, a slower prop speed is provided in comparision with a single-prop job.

With the opposite rotaing props, you can pack in all the power that you can summon the courage and muscle to windf and need have no worries about that ol' debbil torque. And if you are inclined to zippy climb, the Twinster gives out in a manner calculated to make the most zoom-happy P-38 pilot jealous.

The plane is of conventional contest-type construction, throughout. It was planned to be rugged and has proven to be so. Consequently, it is a bit over the minimum required weight for a ship of this size..."

Direct submission to Outerzone.


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

Twinster (oz4886) by Claude McCullough from Air Trails 1947 - model pic

  • (oz4886)
    by Claude McCullough
    from Air Trails
    June 1947 
    48in span
    Rubber F/F Multi
    all formers complete :)
  • Submitted: 01/10/2013
    Filesize: 1012KB
    Format: • PDFbitmap
    Credit*: theshadow

Twinster (oz4886) by Claude McCullough from Air Trails 1947 - pic 003.jpg
Twinster (oz4886) by Claude McCullough from Air Trails 1947 - pic 004.jpg
Twinster (oz4886) by Claude McCullough from Air Trails 1947 - pic 005.jpg
Twinster (oz4886) by Claude McCullough from Air Trails 1947 - pic 006.jpg
Twinster (oz4886) by Claude McCullough from Air Trails 1947 - pic 007.jpg
Twinster (oz4886) by Claude McCullough from Air Trails 1947 - pic 008.jpg

Do you have a photo you'd like to submit for this page? Then email

User comments

Hi Steve, Hi Mary, just some pictures for the site: Twinster, ID4886 [model photo & more pics 004-007]. Made for the 2018 Pontefract Single Channel & Retro Fly-in; I took a few liberties and added R/C on rudder(s), elevator & throttle and used electric power. It's a great flyer!
ColinBaxter - 12/07/2018
I can't find where the center of gravity should be?
Tomas Dunker - 30/07/2019
Add a comment



Download File(s):


* 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.


Terms of Use

© Outerzone, 2011-2020.

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.