Blog Archives

Wallace McNair’s Hirth Powered Mynah

Here’s a great close up of Louis McNair in the Hirth F23 powered Mynah.

Wallace says ‘It is running very well, as expected. The 72  x 36 inch prop driven with a 2.7  : 1 reduction is proving ideal.  At the time I ordered the F23 I tried to buy the Hirth belt reduction with that ratio but was told it was not produced.

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Posted in Aero Articles
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Sparky Stuff

by Phil Kennedy, SprintAero.
As published in Sport Flying Magazine, Spring 2015
SAA SP1961

A LITTLE TOYOTA that hasn’t had it’s plugs checked in years, because the mechanics thought it had Iridiums that need changing only every 100,000 km, developed a misfire the other day.

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Posted in Aero Articles


Some things change … and some things stay the same

by Phil Kennedy, SprintAero.
As published in Sport Flying Magazine, Spring 2015.
SAA SP1961

As many of readers may know, I am a reader of historical aviation stuff and have an evergrowing collection of the Jane’s All The World’s Aircraft annuals within my library.

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Posted in Aero Articles


The Engine Cooling Fan Club

by Phil Kennedy, SprintAero.
As published in Sport Flying Magazine, Winter 2015.
SAA SP1961

Some of the most successful manufacturers of air-cooled engines, in both numbers and horsepower outputs, have updated their engines with close fitting cooling shrouds and fans. So when the majority of the air-cooled engines fitted to homebuilt aircraft have neither proper shrouds nor fans,

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Posted in Aero Articles


Forced Induction

SPF Cover Summer 2015by Phil Kennedy, SprintAero.
As published in New Zealand Sport Flying Magazine Summer 2015 issue.
SAA SP1961

Unfortunately for those of us based in reality, the likes of “Knight Rider” and other silly TV programmes have given the public a very strange slant on what supercharging of any form really does for an engine.

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Posted in Aero Articles, Custom Design


Why So Cranky?

by Phil Kennedy, SprintAero.
As published in Sport Flying Magazine, Autumn 2015.
SAA SP1961

STARTING OUR ENGINES and supplying enough power to allow us to do it again is the subject of much consternation among the light aircraft community.

We have three distinct groups within this community, 

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Posted in Aero Articles


Induced Drag vs Form Drag

by Phil Kennedy, SprintAero.
As published in Sport Flying Magazine, Spring 2014.
SAA SP1961

A RELEVANT QUESTION to our sport might be: “Is drag of low importance because we fly slowly, or do we fly so
slowly because of the drag issues we ignore?”

In recent days we at SprintAero have been blessed with the support of an engineer who just loves to review
things from a first principles point of view.

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Posted in Aero Articles


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