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From: Bulent Aliev <atlasyts@bellsouth.net>
Subject: Re: [FlyRotary] N11XD  - Post 1st flight inspection and second flight
Date: Sun, 26 Nov 2006 17:54:49 -0500
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

Jim, thanks for the report. Aluminum as a heat shield is not a good  
idea.My first straight exhaust cracked all over in the second hour of  
running.
If I did not have a stainless heat shield, its likely I could have  
burned something or worse? I always use 0.016 gauge stainless for the  
heat shields.
Try running your engine at night at full throttle with the cowling  
off. You'll be surprised :)
What RPM are you running on TO?

Bulent "Buly" Aliev
FXE Ft lauderdale, FL
  http://tinyurl.com/dcy36

On Nov 26, 2006, at 5:32 PM, James Maher wrote:

> Yesterday I finally got around to the post 1st flight inspection on  
> my Delta.
> Checked all the controls, skins, airframe stuff and then removed  
> the top cowl.
> Everything looked great until I got to the muffler.
> The muffler was fine but the heat shield between it and the intake  
> manifold was MELTED!
> About a 4" x 4" hole directly above the center of the muffler with  
> gobs of aluminum slag in the bottom of the cowl.
> I believe that the heat shield got hot enough to droop and then  
> contacted the muffler surface and was history after that.
> It's a good thing that the plenum (also aluminum) did not melt and  
> get sucked into the intake.
> That would have ruined my day.
> I fabricated another piece of alum and wrapped it up around the  
> plenum this time to prevent it from contacting the muffler.
> This is a temporary solution at best.
> I have an idea for a more permanent one but did not have the  
> material on hand at the time.
> With temporary fix completed I proceeded to fly the second test  
> flight.
> The OAT was 60F, 10F degrees higher than the first flight and the  
> engine acted accordingly.
> The coolant was up to 212F and stable by the end of the runup.
> Luckily the oil was only about 170F so I proceeded to takeoff.
> Climbing out at 110-120MPH the coolant temp was 212F with the oil  
> coming up.
> After level off at 3000 feet the coolant eventually came back down  
> to a more comfortable 190F with the oil about the same.
> My eyes were almost glued to the EGT though, because I was  
> concerned about another meltdown. The highest EGT that I noticed  
> was about 1580F.
> I kept the mixture a little richer than last time hoping to keep  
> the temps down.
> After circling the airport for over a half hour I decided I better  
> land, as the I was loosing the sun again.
> I turned base and final too short, so I was high and fast (flying  
> the pattern at 120MPH takes a little getting used to),
> But I did have 9000 feet of runway below me so I managed to get it  
> down but not in the first 3000 feet like last time.
> It was more like the second 3000 feet.
> Any other airport it would have called for a go around.
> But it wasn't a bad landing and I didn't break anything.
> Didn't have time or light to look under the cowl after this flight  
> as it was already well after 4:00PM ( I hate standard time).
> Can't wait to get the airplane back to it's home airport.
> An hour and a half is just too far to drive.
> Jim Maher
> Dyke Delta N11XD 13b (2.1 hours flown)
>