Jeff/Jeff,
Keep in mind the muffler is for noise concerns in Europe. In the US we
do not have these limitations as of yet. Check with Rotax on exhaust
backpressure requirements (tuning the exhaust pipe length) and you can
modify away. Each of the new SLSA aircraft have a different exhaust
shape and size. I am tempted to take my bore-scope to Sun N Fun to have
a peek at some different 912 exhausts. Personally, I will keep my 914
stock. I don't have cooling problems on my engine cowl arrangements I
build in the shop. I have done Jabiru's with straight pipes, why not
the Rotax. Jason Parker and I have a 914 doing well without a muffler,
but the turbo gives us the the same backpressure of the stock engine.
A lot of the cowl design concerns on the 912S/914 Rotax powered Europas
are a compromise between maintenance, plumbing and production. Custom
cowl changes create a number of challenges. I am now doing another
Lopresti style cowl for a 914/Airmaster customer who wants a belt driven
hi output alternator. I have a slick through the shaft brush assembly
which allows it all to work. Sorta-kind-maybe-hopefully with numerous
front mods it will cool better than stock. It just takes time, money,
and experimentation.
Keep us posted,
Bud Yerly
Custom Flight Creations
----- Original Message -----
From: JEFF ROBERTS<mailto:jeff@rmmm.net>
To: europa-list@matronics.com<mailto:europa-list@matronics.com>
Sent: Saturday, January 24, 2009 12:00 PM
Subject: Re: Europa-List: Exhaust Question
<jeff@rmmm.net<mailto:jeff@rmmm.net>>
Interesting Jeff!! Keep us all posted and if you have any pictures of
your cowl yet send em over direct to me. I've got the clay out and
working on some new intake holes right now.
I'm also going to make a shroud to go over the 912 like the one I saw
on the RV-12 at KOSH. This will allow me with a flap to control CHT's
better. Plus I'm doing Buds heater mod as well. Looks like I'm down
for
a while but now is the time with the weather and all.
Regards,
Jeff R.
A258 - N128LJ / Gold Rush 176 hours and climbing slowly.
On Jan 24, 2009, at 9:48 AM, Jeff B wrote:
<topglock@cox.net<mailto:topglock@cox.net>>
>
> Jeff,
>
> The new cowl design, I'm working on, will require a new exhaust
> system. I'm currently looking at a split system with two collectors
> for two pipes, each. I want to incorporate a small baffle in each
> side to help with the noise, but haven't gotten that far, yet. Just
> something to ponder when you're not flying... :)
>
> Jeff - Baby Blue
>
> JEFF ROBERTS wrote:
>> Exhaust question from a non technical Europa builder flyer. I
>> remember my flight instructor 15 or 20 years back always said a
>> stupid question is the one not ask so here it goes...
>> As I'm doing my annual and looking at this large muffler pushed
into
>> a small place I can't help wondering why it has to be this large.
It
>> would seem something smaller wouldn't have such a heat buildup and
>> allow cooling air from above to move down thru easier. I understand
>> the noise requirements across the pond but here in the states has
>> anyone gone with something smaller? Would it not be good for the
912
>> to go with straight pips?
>> Just curious...
>> Jeff R.
>> A258 - N128LJ / Gold Rush 170 hours and climbing slowly.
>> size=2 color="#000000" face="courier new,courier">
>>
href="http://www.matronics.com/Navigator?Europa-List";>http://<http://ww
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cs.com/contribution">http://>
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