Mailing List flyrotary@lancaironline.net Message #3031
From: Russell Duffy <13brv3@bellsouth.net>
Subject: RE: [FlyRotary] Re: turbo performance?
Date: Tue, 16 Sep 2003 09:14:42 -0500
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Message
You're probably not as curious now about this since you've been out wrangling up some extra ponies, but here it is anyways... 
 
I'll be curious right up until I can prove how this all works.   I really do want to keep the turbo as long as it makes sense to do so. 
 
Lots. I had dreams of 2000fpm, but was expecting 1200fpm without using boost, but managed a dismal 500fpm. However aircraft weight was approx 1700 lbs, as there was two of us on board and I was carrying more fuel than necessary. 
 
I sure hope you get your EWP soon, so you can get some more testing in.  Between the two of us, we might be able to figure something out.  Bruce said that rotaries are affected more by backpressure than piston engines, but did not think that it would amount to anywhere near 5 psi of boost to compensate.  After all, the stock boost setting for an 86-87 turbo RX-7 was 5.5 psi, so what would be the point of installing a turbo if you needed all the boost to make up for the restriction?  I'm thinking that 2 psi is probably a reasonable "break even" level of boost, and I'd be perfectly happy with that (if I can get my wastegate to play nice).   
 
I'm also considering removing my wings and bringing my plane home, but for different reasons. 
 
Sorry to hear the dismal flight testing future.  I've all but forgotten about bringing mine home.  The current hope is that I'll be back in the saddle with the power I'm supposed to have, then I can use my flight test hours to tame the unwanted boost, as well as help determine the final radiator size, and inlet area.  I should be able to use my junk engine to fabricate the new intake (as soon as Ed gives us the info we need <g>), cut down a water pump housing,  etc.  This will save a bunch of downtime on the plane when it comes time to tackle the BUC.  
 
Thanks,
Rusty
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