Martin AM Mauler (oz4797)


Martin AM Mauler (oz4797) by Clair Sieverling from Model Airplane News 1964 - plan thumbnail

About this Plan

Martin Mauler. Scale model for control line carrier class. Johnson 36 and automix carburetor used on original model.

Direct submission to Outerzone.

Update 20/04/2021: Added article, thanks to RFJ.

Quote: "What better way to get ready for the trend towards smaller Carrier planes than with this fine .35 powered winner. It can compete with the best of them. The Mauler, by Claire Sieverling.

This model was designed to consistently outperform the typical .35-powered carrier model in use today, and, with thorough experimentation in engine, fuel and props, to give the .60 jobs a run for their money. If properly built, it will do just that.

Now that I've stuck my neck out, let me go into details: Separate events for .35 class carrier models are becoming more popular in the Southwest and in other parts of the country. Since I already had a fairly successful .60-powered job for that class, I was too far addicted to the event to see all those .35 class trophies going to waste!

The first question was, 'What size model will be the most effective combination of smallness for speed, plus wing area for slow flight?' At this time, everyone was flying carrier model kits powered by .35's except Gene Cooper, a 'forge ahead' type who was flying a Netzeband Guardian and winning most of the contests. So it was pretty obvious that a ship with a span of around thirty inches would out-run the current kit jobs by 10 to 15 mph and still equal their low speed times.

The next question was 'What airplane has a higher ratio of wing to frontal area than the Guardian?' I also considered other factors such as moment arms, construction problems, potential flap areas, landing gear position, etc. I studied various planes and filled countless pages of scratch paper with wing area computations, sketches, etc., and was about to give up and build a Guardian when I started playing with the scale three views of the Mauler which are included in the J. Roberts Mauler kit. The more I doodled, the more excited I became, and soon I had roughed-out three views which were just the right size. Much to my surprise, and Cooper's, the ratio of wing area to frontal area was higher than the Guardian! Generous flap area was available, a kick over rudder could be used; the design was looking better all the time.

The last problem was to design the construction features. Being somewhat of a pessimist, and a little lazy at the work bench, I could anticipate all kinds of problems in getting this model off the drawing board and into the air. Once again I was pleasantly surprised. The thing fell together like a simple stunt job; the scale fuselage width just happened to exactly match the Johnson crankcase plus standard 3/8 motor mounts and 1/2 in sides, etc. So I ended up with a model blown up three times from the scale views included in the J Roberts kit. The five percent tolerance allowed in the rule book was used in several places (such as control surfaces) to improve performance, so stay within the lines on the drawing when building the model. I have never been to a carrier contest in which there was any shortage of Mauler three views so you should have no trouble supporting your claim of scale dimensions.

Now you're wondering what the performance was, after all this 'high level' engineering work! First, let me set the stage: As many of you know, I concentrate on stunt flying and make no claims to fame as an engine performance expert; carrier flying is a diversion from my stunt flying and my carrier practice amounts to flying once or twice just before a contest, flying my official flight, and then hanging the model up until the next contest. I do very little experimenting with props, fuel and engines for two good reasons: (1) my stunt flying doesn't leave me time to experiment, and (2) I'm lost when I try to make an engine do anything but four cycle contentedly and 'squeak' in the turns!

Now that the ground rules are laid, here is what my Mauler is equipped with: a new (and still tight!) Johnson Stunt Supreme which was unemployed at the time, fitted with the Johnson throttle, and 8-8 Top Flite prop, Missile Mist fuel and braided cable (three lines) of regulation length and diameter. With this equipment, the model will do between 80 and 85 mph for the high speed laps and 22 to 25 mph for the low speed laps..."

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

Martin AM Mauler (oz4797) by Clair Sieverling from Model Airplane News 1964 - model pic

  • (oz4797)
    Martin AM Mauler
    by Clair Sieverling
    from Model Airplane News
    April 1964 
    30in span
    Scale IC C/L LowWing Military Bomber
    all formers complete :)
    got article :)
  • Submitted: 05/09/2013
    Filesize: 554KB
    Format: • PDFbitmap
    Credit*: JJ

  • Martin_AM_Mauler | help
    see Wikipedia | search Outerzone

    ScaleType: This (oz4797) 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.

Martin AM Mauler (oz4797) by Clair Sieverling from Model Airplane News 1964 - pic 003.jpg
Martin AM Mauler (oz4797) by Clair Sieverling from Model Airplane News 1964 - pic 004.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, 2011-2021.

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.