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Return-Path: <13brv3@bellsouth.net> Received: from imf24aec.mail.bellsouth.net ([205.152.59.72] verified) by logan.com (CommuniGate Pro SMTP 4.1.1) with ESMTP id 2531974 for flyrotary@lancaironline.net; Mon, 18 Aug 2003 09:52:15 -0400 Received: from rad ([68.212.14.21]) by imf24aec.mail.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20030818135215.OPJX19510.imf24aec.mail.bellsouth.net@rad> for ; Mon, 18 Aug 2003 09:52:15 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] EWP seized Date: Mon, 18 Aug 2003 08:52:15 -0500 Message-ID: <009e01c3658f$ef97af50$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_009F_01C36566.06C1A750" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_009F_01C36566.06C1A750 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I do find that the motor gets too hot to hold your hand on continuously, = but it has been like that since I first used it. While I don't really like = this motor high temp, I realize it is not uncommon for small motors so I = wasn't too concerned. Now I wonder if it was a factor, combined with under cowl temps from my run-up. =20 Sorry to hear about that. Sounds like it wouldn't hurt to add a small = blast cooling tube for the EWP motor. No point in torturing the little motor = that you're trusting your life to :-) =20 That being said, I would suspect that you have a bad bearing, which = would explain the odd noise you heard before, and the recent lockup. = Certainly, you're not subjecting it to any more heat or stress than it could get in = a car, so I'd have to assume that you just got a unit that was defective. = I'm not sure if they'll honor the warranty, but if it were me, I would buy another unit, rather than fly with the one you have. =20 =20 Here's another thought. Did you confirm that it really didn't blow the = fuse when you replace it? If the pump was seized, and you put power to the motor, it should have blown the fuse. If it didn't, that would suggest = an internal thermal protection device in the motor, and I'd be mighty interested to know what temp that thing trips at. Since the fuse blew initially, we can assume that the thermal protection had not kicked in = prior to blowing the fuse. In other words, heat from the electrical load of = the struggling motor did not trip the thermal protection. Next, the motor = was heated further by the engine compartment, and 240 degree coolant. Did = the thermal cutout occur due to the high operating temps? If that's the = case, it would be disturbing, since high temps could result from a number of = other problems, and the last thing you need is your water pump to quit at the = same time. Keep in mind that this whole paragraph is pure speculation, but = is certainly something to think about. =20 =20 Good luck, Rusty =20 =20 =20 =20 =20 =20 ------=_NextPart_000_009F_01C36566.06C1A750 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

I do = find that the=20 motor gets too hot to hold your hand on continuously, but it has been = like that=20 since I first used it. While I don't really like this motor high temp, I = realize=20 it is not uncommon for small motors so I wasn't too concerned. Now = I wonder=20 if it was a factor, combined with under cowl temps from my=20 run-up.

Sorry to hear = about=20 that. Sounds like it wouldn't hurt to add a small blast = cooling tube=20 for the EWP motor. No point in torturing the little motor that = you're=20 trusting your life to :-)

That being said, I would = suspect that you=20 have a bad bearing, which would explain the odd noise you heard before, = and the=20 recent lockup. Certainly, you're not subjecting it to any = more heat=20 or stress than it could get in a car, so I'd have to assume = that you just=20 got a unit that was defective. I'm not sure if they'll = honor the=20 warranty, but if it were me, I would buy another unit, rather than = fly with=20 the one you have.

Here's another thought. = Did you=20 confirm that it really didn't blow the fuse when you replace it? = If the=20 pump was seized, and you put power to the motor, it should = have blown the=20 fuse. If it didn't, that would suggest an internal thermal=20 protection device in the motor, and I'd be mighty interested = to know=20 what temp that thing trips at. Since the fuse blew initially, = we can=20 assume that the thermal protection had not kicked in prior = to blowing the=20 fuse. In other words, heat from the electrical load of the = struggling=20 motor did not trip the thermal protection. Next, the = motor was heated=20 further by the engine compartment, and 240 degree=20 coolant. Did the thermal cutout occur due to the = high=20 operating temps? If that's the case, it would be disturbing, since = high=20 temps could result from a number of other problems, and the last thing = you need=20 is your water pump to quit at the same time. Keep in mind that = this whole=20 paragraph is pure speculation, but is certainly something to think=20 about.

Good=20 luck,

Rusty

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