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Return-Path: <13brv3@bellsouth.net> Received: from imf25aec.mail.bellsouth.net ([205.152.59.73] verified) by logan.com (CommuniGate Pro SMTP 4.1.3) with ESMTP id 2581389 for flyrotary@lancaironline.net; Tue, 16 Sep 2003 10:14:42 -0400 Received: from rad ([68.212.12.251]) by imf25aec.mail.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20030916141440.QBMA1843.imf25aec.mail.bellsouth.net@rad> for ; Tue, 16 Sep 2003 10:14:40 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: turbo performance? Date: Tue, 16 Sep 2003 09:14:42 -0500 Message-ID: <013401c37c5c$dfb878b0$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0135_01C37C32.F6E270B0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0135_01C37C32.F6E270B0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable You're probably not as curious now about this since you've been out wrangling up some extra ponies, but here it is anyways...=20 =20 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.=20 =20 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.=20 =20 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). =20 =20 I'm also considering removing my wings and bringing my plane home, but = for different reasons.=20 =20 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 ), = 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. =20 =20 Thanks, Rusty ------=_NextPart_000_0135_01C37C32.F6E270B0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message

You're=20 probably not as curious now about this since you've been out wrangling = up some=20 extra ponies, but here it is anyways...

I'll be = curious right up=20 until I can prove how this all works. I really do want to = keep the=20 turbo as long as it makes sense to do=20 so.

Lots. I had=20 dreams of 2000fpm, but was expecting 1200fpm without using boost, but = managed a=20 dismal 500fpm. However aircraft weight was approx 1700 lbs, as there was = two of=20 us on board and I was carrying more fuel than necessary.

I sure hope = you get your EWP=20 soon, so you can get some more testing in. Between the two of us, = we might=20 be able to figure something out. Bruce said that rotaries are = affected=20 more by backpressure than piston engines, but did not think that it = would amount=20 to anywhere near 5 psi of boost to compensate. After all, the = stock boost=20 setting for an 86-87 turbo RX-7 was 5.5 psi, so what would be the point = of=20 installing a turbo if you needed all the boost to make up for the=20 restriction? I'm thinking that 2 psi is probably a=20 reasonable "break even" level of boost, and I'd be perfectly happy = with=20 that (if I can get my wastegate to play=20 nice).

I'm=20 also considering removing my wings and bringing my plane home, but for = different=20 reasons.

Sorry to = hear the=20 dismal flight testing future. I've all but forgotten about = bringing mine=20 home. The current hope is that I'll be back in the saddle with the = power=20 I'm supposed to have, then I can use my flight test hours = to tame=20 the unwanted boost, as well as help determine the final radiator = size, and=20 inlet area. I should be able to use my junk engine = to=20 fabricate the new intake (as soon as Ed gives us the info we need=20 <g>), cut down a water pump housing, etc. = This will=20 save a bunch of downtime on the plane when it comes time to tackle = the=20 BUC.

Thanks,

Rusty

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