Can't think who would do such a dastardly thing, robbing Rotax of income!
D.
----- Original Message -----
From: "Robert C Harrison" <ptag.dev@tiscali.co.uk>
Sent: Sunday, March 09, 2008 10:22 PM
Subject: RE: Europa-List: Re: High temperature fiberglass
> <ptag.dev@tiscali.co.uk>
>
> Hi! Jeff/all
> These items are called "Barrel hoods" and are available as a Rotax
> Option in the region of GBP 200.!
> No doubt the plug around which to make these was a very demanding
> process and requires a tight dimensional tolerance.
> However with the benefit of one it would be easy to make a "splash" and
> copy it.
> Regards
> Bob Harrison. G-PTAG
>
> -----Original Message-----
> From: owner-europa-list-server@matronics.com
> [mailto:owner-europa-list-server@matronics.com] On Behalf Of JEFF
> ROBERTS
> Sent: 09 March 2008 21:38
> To: europa-list@matronics.com
> Subject: Re: Europa-List: Re: High temperature fiberglass
>
>
> Hello All,
> I too have been contemplating making these plenums as I'm still
> struggling with keeping the back cylinder temps down. Today with some
> engine static test I had the back # 3 cylinder temp at 260 to 265 F.
> Not a problem at the current 60 F outside but I know the hot Florida
> temps at Sun-N-Fun could again push the limit for me. Last year during
> climb out there, and during our Tennessee heat wave they were a
> problem. Lower climbs we're necessary. After many attempts trying every
> suggestion talked about on this forum and elsewhere. My back CHT's are
> still too high and when it's cold they are too un even from the fronts
> as well.
> My friend Steve Wright of the Stagger EZ fame told me that a plenum
> would be the only way to get the heads running at an even and at cooler
> temperatures. He made his with the RTV mentioned below. Unless I have
> any other suggestions it looks like the plenum may be the way to go.
> Can these be bought or is there anyone out there that has discarded
> there's. If not I'll be making some as well.
> Your thought are very welcome here.
>
> Regards,
> Jeff R.
> A258 - N128LJ / Gold Rush 105 hours and climbing slowly.
>
>
> On Mar 9, 2008, at 11:56 AM, D Wysong wrote:
>
>>
>>> Anyhow, I am curious about what type of fiberglass cloth and resin
>>> system they use that could withstand the temperatures under the
>>> cowling. Does anyone have any idea ?
>>
>> Hello Paul,
>>
>> Standard E-glass BID and EZ Poxy have been successfully used to build
>> cooling plenums for pushers/canards (Long EZ, Varieze, etc.). Google
>> "downdraft cooling eze" for some details. You'll need to post cure
>> the plenums in order to elevate the temps at which the resin goes
>> "soft", so any resin system that benefits from a post cure should
>> suffice.
>>
>> Folks have also impregnated 2 or 3 plies of BID cloth directly with
>> RTV to make their plenums. Sounds strange and messy, but it works.
>> Put down a piece of plastic drop cloth, add 1 ply of BID (cut to
>> shape), squirt on some RTV, add another piece of drop cloth, and use a
>> rolling pin to squish the RTV through the BID. Build it up to 3 plies
>> and, before it cures, pull off one side of drop cloth and stick the
>> exposed RTV directly onto your cylinder fins and mold the 3-ply sheet
>> to shape.
>>
>> D
>>
>>
>>
>>
>
>
> --
> Checked by AVG.
> 08/03/2008 10:14
>
>
>
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