Chipmonk Nine (oz13233)


Chipmonk Nine (oz13233) by Pete Tindal 1977 - plan thumbnail

About this Plan

Chipmonk 9. Control line stunt model for .35 to .49 engines. Wingspan 57 in, wing area 688 sq in.

Direct submission to Outerzone.

Update 21/08/2021: Added article, thanks to CarloAM.

Quote: "Chipmonk 9, by Peter Tindal. Designed by Britain's foremost stunt flier, this 40-powered control-liner has a long string of wins and performed credibly at the World Champs.

I FEEL it is time that my model should see the light in the hands of other modelers, as there appear to be too few semi-scale stunt models on the scene (excluding models a la Rabe, which seem beyond the average modeler because of time commitments. myself included).

I would pass on just two comments, one from Jim Manrtall, six times Gold Trophy winner: It's the first model belonging to someone else that I have flown for a long time that I have felt happy with straight off the ground; and the second from John Heanen, junior stunt Champion four years ago, now placing regularly in top five: 'Beautiful!'

This could obviously be said about a lot of models but I think its record over the past couple of years adds weight to the above comments, plus the model has been modi-fied from the number 7. which they both flew, to the number 9.

I decided just before the 1975 Nationals that the model I was flying could do with a lighter wing loading and, as I couldn't build any lighter, I decided to build bigger, thus the Chipmonk Number 9 evolved. The root chord went up by 1-1/2 inches. The tail was increased by some 20% and the wingspan was increased to 57 inches from 54 giving a wing area of some 688 sq in. This meant that even with a weight of 54 oz (which is quite heavy but easy to build to) it was still 12.75 sq in per oz, which falls well into the 11-14 sq in per ounce at which I have always aimed.

The Detroiter style of wing, as explained to me some seven years ago by Neil Billington is still the quickest way of building a wing and, when modified to a D-box section. becomes very rigid as well. The method can be used for any wing design, symmetrical or not. (The only difference being that different templates are required for asymmetrical sections.)

Construction: First decide on the section of the wing to he used and make a template of the section between the leading edge and trailing edge at the point of maximum chord (Sketch A). The template should be at least 3 in deep which makes it easier to hold and thus becomes less tiring on the wrist when cutting out the ribs.

I find with Detroiter style that there is no need to put in any more ribs than normal, so decide on the number of ribs, double it and add 8 for the tips, to give the number of ribs required, usually about 70. Don't be put off by this large number as they can be cut out in approximately half an hour.

To cut the ribs I usually cut two sheets of 4 x 1/16 into pieces, the length of the template, then put them one on top of the other. I then mark (as Sketch B) spaces from the bottom of the sheeting to the top and then cutting can commence. Just lay the template on top of the pile and commence cutting..."

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

Chipmonk Nine (oz13233) by Pete Tindal 1977 - model pic

  • (oz13233)
    Chipmonk Nine
    by Pete Tindal
    from Model Aviation
    April 1977 
    57in span
    Scale IC C/L LowWing
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 23/07/2021
    Filesize: 605KB
    Format: • PDFbitmap
    Credit*: JJ
    Downloads: 508

  • De_Havilland_Canada_DHC-1_Chipmunk | help
    see Wikipedia | search Outerzone
    Test link:
    search RCLibrary 3views (opens in new window)

    ScaleType: This (oz13233) 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.

    ScaleType is formed from the last part of the Wikipedia page address, which here is
    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.

Chipmonk Nine (oz13233) by Pete Tindal 1977 - pic 003.jpg
Chipmonk Nine (oz13233) by Pete Tindal 1977 - pic 004.jpg
Chipmonk Nine (oz13233) by Pete Tindal 1977 - pic 005.jpg

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

User comments

No comments yet for this plan. Got something to say about this one?
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, 2011-2024.

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.