X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mailout1.pacific.net.au ([61.8.0.84] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTP id 1008121 for flyrotary@lancaironline.net; Mon, 20 Jun 2005 17:30:55 -0400 Received-SPF: none receiver=logan.com; client-ip=61.8.0.84; envelope-from=peon@pacific.net.au Received: from mailproxy1.pacific.net.au (mailproxy1.pacific.net.au [61.8.0.86]) by mailout1.pacific.net.au (8.13.4/8.13.4/Debian-1) with ESMTP id j5KLU8mY004327 for ; Tue, 21 Jun 2005 07:30:08 +1000 Received: from ar1 (ppp2DF8.dyn.pacific.net.au [61.8.45.248]) by mailproxy1.pacific.net.au (8.13.4/8.13.4/Debian-3) with SMTP id j5KLU6UV004499 for ; Tue, 21 Jun 2005 07:30:06 +1000 Message-ID: <006301c575dd$ae79b080$f82d083d@ar1> From: "Leon" To: "Rotary motors in aircraft" References: Subject: Apex Seals & Balancing was Re: [FlyRotary] Re: Weights Date: Tue, 21 Jun 2005 07:19:01 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0060_01C57631.7F7A8C60" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 This is a multi-part message in MIME format. ------=_NextPart_000_0060_01C57631.7F7A8C60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Thomas, Richard Sohn is on the case. He already posted the answer. The apex = seals and springs are suported by the trochoid at all times, and don't = act on the eccentric shaft assy. The whole trick to getting the balance = right is the oil mass allowance.=20 Cheers, Leon ----- Original Message -----=20 From: rijakits=20 To: Rotary motors in aircraft=20 Sent: Tuesday, June 21, 2005 4:04 AM Subject: [FlyRotary] Re: Weights Quich question to balancing: Though your list is not specifically pointed to balancing. For a dynamic balance job DO YOU or DO YOU NOT include the weight of = the apex-seals? Apparently they should not bear on the rotor/excenter of the shaft, as = the rotorhousing carries their weight at all times. Am I missing something? Leon? Thomas J. ----- Original Message -----=20 From: George Lendich=20 To: Rotary motors in aircraft=20 Sent: Monday, June 20, 2005 6:18 AM Subject: [FlyRotary] Weights Rusty, Here's some very accurate weights for your records- Apex corner seals x6 =3D 19grams Apex corner seal springs x 6 =3D 1 gram Side seal springs x6 =3D1 gram Side seals x6 =3D 25grams Oil seal springs x4 =3D 10 grams Oil seal retainers( metal) x4 =3D 92 grams Oil 'O' rings x4 =3D 16 grams Total of 164 grams ( 5.784936 oz) Weighed all together 164 grams ( as a check for accuracy) RX8 Rotor 9.3346lbs( 4243 grams) I just can't see how you get 10 lb 9 oz rotor weight comparing these = weights, even though the RX7 rotors are a tad heavier! BTW Tracy's apex seals are 30 grams. George ( down under) ------=_NextPart_000_0060_01C57631.7F7A8C60 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Thomas,
 
Richard Sohn is on the case.  He = already=20 posted the answer.  The apex seals and springs are suported by = the=20 trochoid at all times,  and don't act on the eccentric shaft = assy. =20 The whole trick to getting the balance right is the oil = mass allowance.=20
 
Cheers,
 
Leon
----- Original Message -----
From:=20 rijakits
Sent: Tuesday, June 21, 2005 = 4:04=20 AM
Subject: [FlyRotary] Re: = Weights

Quich question to balancing:
 
Though your list is not specifically pointed = to=20 balancing.
For a dynamic balance job DO YOU  or DO = YOU NOT=20 include the weight of the apex-seals?
Apparently they should not bear on the = rotor/excenter of=20 the shaft, as the rotorhousing carries their weight at all = times.
 
Am I missing something?
 
Leon?
 
Thomas J.
----- Original Message -----
From:=20 George Lendich
To: Rotary motors in = aircraft=20
Sent: Monday, June 20, 2005 = 6:18=20 AM
Subject: [FlyRotary] = Weights

Rusty,
Here's some very accurate weights = for your=20 records-
Apex corner seals x6 =3D = 19grams
Apex corner seal springs x = 6 =3D 1=20 gram
Side seal springs x6 =3D1 = gram
Side seals x6 =3D = 25grams
Oil seal springs x4 =3D 10 = grams
Oil seal retainers( metal) x4 = =3D 92=20 grams
Oil 'O' rings x4 =3D 16 = grams
 
Total of 164 grams ( 5.784936 = oz)
 
Weighed all together 164 grams ( as = a check for=20 accuracy)
 
RX8 Rotor 9.3346lbs( 4243 = grams)
 
I just can't see how you get 10 lb = 9 oz rotor=20 weight comparing these weights, even though the RX7 rotors are = a tad=20 heavier!
 
BTW Tracy's apex seals are 30=20 grams.
George ( down=20 under)
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