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Message-ID: <497DCFCD.5030301@sbcglobal.net>
Date: Mon, 26 Jan 2009 09:59:25 -0500
From: John Slade <sladerj@sbcglobal.net>
Reply-To: sladerj@sbcglobal.net
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Current Turbos being Used
References: <list-3452457@logan.com>
In-Reply-To: <list-3452457@logan.com>
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David,
Yes, your 3rd gen Cosmo will need better cooling because it packs 
another 20 or 30 horses at least. I've seen those intakes - they're 
about 20% bigger than mine. I believe it's the same setup as mine - 3mm 
seals and 9.7 rotors. With a T04 it's gonna be a rocket ship. I think 
those 3mm seals will protect you from the detonation devil to some 
extent. I also found that the IVO prop kept detonation at bay. I'd hear 
it with my fixed pitch prop as the engine tried to turn it during run-up 
- kinda like using full throttle in top gear up a hill - but I never 
hear it with the IVO on fine pitch.

I slightly misspoke - One of my "oil coolers" is actually a 3rd gen 
transmission fluid cooler. They're almost exactly the same as the oil 
coolers.

I tried a very powerful coolant fan on the bottom of the rad (out of a 
Ferrari). It did nothing useful, and I think it got in the way of 
airflow when airborne. I took it out. Part of the problem may have been 
airflow when on. It could have been drawing hot air from inside the cowl 
through the oil coolers and recirculating it. I think the two most 
effective aspects of my cooling are the sealed plenum under the rad, and 
the exhaust augmentation. The latter handles on-the-ground cooling 
fairly well. I stabilize at around 200 on a hot day. I have a standard 
NACA scoop and no additional armpit scoops. I throttle back and do a 
"cooling pattern" after take off on a very hot 90F+ day. This seems to 
be a fair trade-off for minimum drag at altitude.

I installed a cowl flap at the back of the plenum. I can open it in 
flight to allow excess cooling air out of the back pf the boat tail 
cowl. I can't say for sure, but it doesn't seem to make much difference.

No, I didn't go with the ceramic bearing (on advise from the turbo 
expert I consulted with). He felt the standard bearings with the big 
shaft were more proven.

 >What about the turbine wheel F1 62, 65 or 68?
No idea. I don't have a note of this option. I guess you could ask them 
what I got. Perhaps Chrissie knows. All I know is that it's T04E-50 big 
shaft tangential with P trim and wet housing. Does my aspect ratio of 
0.96 tell you this.

 >What about compressor trim 50 (2.122/3.000) or the Super 50 
(2.122/3.200)?
Same as above

 >Are you still running a stock intercooler or did you end up upgrading?
Stock, but the airflow to it isn't enough. My intake temps are too high. 
(130F or so). I haven't changed it because it seems to work as is. (ie I 
havent blown the engine up yet).

One suggestion I'd make is to do as I did and visit people who have 
running rotaries in Cozys, wherever they are.  (Anyone except Chris :)  
- There's no comparison to one-on-one discussion and personal inspection 
of a working system at this stage. I was lucky - Greg Richter was just 
up the road from me and Buly was 20 miles away. Ride an aluminum tube to 
the North East and I'd be happy to provide accommodation / tour / 
experience flight.

Regards,
John