Bud,
A fascinating article - thanks. It would seem that I have spent the last
God knows how many years researching the same data as you (mostly 1940's
and 50's NACA papers) and come up with much the same conclusions
regarding cooling and cooling drag reduction. By a curious coincidence,
I have been busy this weekend buried in my workshop - laminating.
Compare the results, hot-out-of-the-mould, with the computer generated
cowl design on page 16 of your report. My design concepts would all
appear to have come out of your "Lets's get radical" section!
Keep up the good work.
Nigel
On 10/06/2012 05:21, Bud Yerly wrote:
> Ken and Graham,
> I've attached my modifications and techniques briefing used for Europa
> Cooling with the XS cowl which written up in the Europa Flyer .
> If I do say so myself, I never have cooling issues in Florida at 95
> degree summer days using 50/50 Anitifreeze. Judging by the calls and
> email success stories, these simple techniques work pretty much world
> wide.
> References for further study are at the end of the document.
> Those who have followed these techniques with a stock cowl have no
> problems cooling especially with the trigear. In fact it gets a bit
> too cool in cooler climates and this is with no modifications to the
> existing cowl, only treating the airflow around the coolers.
> I have worked these issues over the last six years and we just
> finished three more aircraft at the shop, all Rotax and we reworked a
> clients Jab 3300, and all the Rotax's have no cooling issues and the
> Jab is tolerable except taxi times must be short, 10 or 15 minutes
> max or it gets a bit too hot for a takeoff on a summer day.
> I'll do another briefing/article on the Jabiru before long.
> Call or email me at the office in Florida below if you have need of
> more specifics or are having problems getting the references on line.
> Regards,
> Bud Yerly
> Europa Tech Support
> US Europa Dealer
> Custom Flight Creations, Inc.
> www.customflightcreations.com <http://www.customflightcreations.com>
> (813) 653-4989
> **
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