Return-Path: Received: from [199.185.220.220] (HELO priv-edtnes03-hme0.telusplanet.net) by logan.com (CommuniGate Pro SMTP 4.1.5) with ESMTP id 2633494 for flyrotary@lancaironline.net; Sun, 12 Oct 2003 03:30:28 -0400 Received: from Endurance ([209.53.248.123]) by priv-edtnes03-hme0.telusplanet.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with SMTP id <20031012073027.VQXI12099.priv-edtnes03-hme0.telusplanet.net@Endurance> for ; Sun, 12 Oct 2003 01:30:27 -0600 From: "Haywire" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] EWP - Response from DaviesCraig Date: Sun, 12 Oct 2003 00:30:20 -0700 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 Importance: Normal In-Reply-To: I can confirm that you can easily see past the impellor on this pump. This is actually an indication that the impellor is not optimized for the pump casing, however it is adequate to do it's job very well. This also allows it to allow flow to past even if it ever seizes, although I don't expect that to ever happen again since I've made a very small mod to correct this. After reading Davies Craig reply I'm considering a series installation as it would allow for redundancy without the addition of another possible failure mode from the T/flapper valve. My only concern is that I've worked hard to reduce or eliminate all possible restrictions to my system and am loathe to introduce another by having a standby pump in the line. However it would be simple for me to measure any change as I have a flow meter. As for wiring options, I would recommend having the main pump controlled by the controller and a second pump controlled by a temperature switch, but with a bypass switch allowing manual activation on 1 or both of these pumps. Everything that I removed from my old mechanical system totalled 12lbs, so even with an additional pump weight is still half. In order to take best advantage of this system an adapter block is required to allow complete removal of the waterpump. I made my own which was a bit of work, but somebody with a mill could probably make them easily. (If I wasn't so darn busy I'd buy a mill and make a bunch to try to pay for it:-) Meziere make a nice looking one, but it requires 2 return hoses and appears to be a little restrictive from the picture. S. Todd Bartrim Turbo 13B RV-9Endurance C-FSTB http://www3.telus.net/haywire/RV-9/C-FSTB.htm "Whatever you vividly imagine, Ardently desire, Sincerely believe in, Enthusiastically act upon, Must inevitably come to pass". >