20 MM.
--- In [email protected], "Jack Burwell" <jackburwell2...@...> wrote:
>
> Me too, a former jet fighter pilot and I pretend they are my 50 cals.
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On
> Behalf Of Donald
> Sent: Sunday, January 31, 2010 11:39 AM
> To: [email protected]
> Subject: [ercoupe-tech] Re: Cowling Bumps
>
>
>
>
>
>
> I am retired military, and it seems to me that there should be machine gun
> barrels sticking out of them.
>
> --- In ercoupe-tech@ <mailto:ercoupe-tech%40yahoogroups.com>
> yahoogroups.com, John Craparo <john.craparo@> wrote:
> >
> > Donald,
> >
> > The original Ercoupe design called for an engine which was designed and
> > built by Erco. It was a four cylinder inline arrangement. The cylinders
> > and plugs were at the bottom of the engine. The cowl for this
> configuration
> > was actually very streamlined and actually came to a point behnd the
> > propeller (you may know that Fred Weick's earlier work was on propellers
> and
> > engine nacelle design... he was about efficiency). It was decided instead
> to
> > use the production Continental engine available and forego manufacturing
> and
> > supporting the inline themselves. This lead to the wider cowl we know,
> with
> > its gills, air intake nosebowl, and the sparkplug humps. I believe any
> cowl
> > you see today without the humps is a modification allowed because the
> > sparkplug wiring was modified on those aircraft.
> >
> > Others here can give you more details and perhaps a more accurate
> recounting
> > of this, but in a nutshell that is why you see two or three (counting the
> > prototype) cowl arrangements. I like the bumps myself... they add
> > character.
> >
> > Best,
> > John
> >
> >
> > On Sun, Jan 31, 2010 at 9:54 AM, Donald <DonGeneda@> wrote:
> >
> > >
> > >
> > > What is the story with the bumps in the cowling? I had been led to
> believe
> > > that the bumps had to be added because of different spark plugs/harness,
> I
> > > know my Ercoupe just very recently had them added. I was surprised
> therefore
> > > to notice that serial number one in 1939 had the identical bumps! What
> gives
> > > with the bumps or lack of bumps?
> > >
> > >
> > >
> >
>
