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From: david mccandless <daval@iprimus.com.au>
Subject: Re: [FlyRotary] WARNING V Grooves
Date: Sun, 24 Apr 2005 06:35:37 +0800
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
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Hi to all, has anyone ever considered ball-milling out the apex seal=20
grooves and pressing in a round tough steel insert and then milling the=20=

seal slot in the steel insert. This would then be' horse shoe' cross=20
section, so to speak. The corner button seals could also fit into the=20
ends. Maybe a new rotor would be cheaper, but this may have better=20
reliability and longer life. FWIW, Dave Mc
On 24/04/2005, at 5:24 AM, Ed Anderson wrote:

> I don't how I missed it before, but I was reading over the helpful=20
> instruction set that Tracy sends out with the Overhaul Kit.=A0 There =
is=20
> only ONE thing that they suggest checking on your rotary engine.
> =A0
> Quote:=A0 " Check the apex seal groove carefully.=A0 The stock seals =
tend=20
> to wear a "V" shape at the opening (mouth) of the groove (rotor).=A0 =
If=20
> the grooves have been "V'ed" more than 0.010" clearance, (a groove=20
> opening width of more than 0.125") your rotor MUST be replaced or=20
> machined to accept 3mm apex seals.=A0 The overall seal to rotor=20
> clearance should be 0.002 to 0.006".=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0 =A0I added the red=20
> and bold to the "must" in the statement (Ed)
> =A0
> So I think its quite clear that Bruce T (whom I assume provided the=20
> input on the instructions) feels that "V" apex grooves could lead to=20=

> BAD things.=A0 Now my V was outside Mazda spec but within the limits =
of=20
> above - however, if all the factors stack up against you at the same=20=

> time, perhaps bad things could happen before you reach the above=20
> limit.
> =A0
> FWIW
> =A0
> Ed
> =A0
> Ed Anderson
> Rv-6A N494BW Rotary Powered
> Matthews, NC
> eanderson@carolina.rr.com=

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Hi to all, has anyone ever considered ball-milling out the apex seal
grooves and pressing in a round tough steel insert and then milling
the seal slot in the steel insert. This would then be' horse shoe'
cross section, so to speak. The corner button seals could also fit
into the ends. Maybe a new rotor would be cheaper, but this may have
better reliability and longer life. FWIW, Dave Mc

On 24/04/2005, at 5:24 AM, Ed Anderson wrote:


<excerpt><fontfamily><param>Arial</param><smaller>I don't how I missed
it before, but I was reading over the helpful instruction set that
Tracy sends out with the Overhaul Kit.=A0 There is only ONE thing that
they suggest checking on your rotary engine.</smaller></fontfamily>

=A0

<fontfamily><param>Arial</param><smaller>Quote:=A0 " Check the apex seal
groove carefully.=A0 The stock seals tend to wear a "V" shape at the
opening (mouth) of the groove (rotor).=A0 If the grooves have been
"V'ed" more than 0.010" clearance, (a groove opening width of more
than 0.125") your rotor
<bold><color><param>FFFF,0000,0000</param>MUST</color></bold> be
replaced or machined to accept 3mm apex seals.=A0 The overall seal to
rotor clearance should be 0.002 to 0.006".=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0<italic> =A0I
added the red and bold to the "must" in the statement =
(Ed)</italic></smaller></fontfamily>

=A0

<fontfamily><param>Arial</param><smaller>So I think its quite clear
that Bruce T (whom I assume provided the input on the instructions)
feels that "V" apex grooves could lead to BAD things.=A0 Now my V was
outside Mazda spec but within the limits of above - however, if all
the factors stack up against you at the same time, perhaps bad things
could happen before you reach the above limit.</smaller></fontfamily>

=A0

<fontfamily><param>Arial</param><smaller>FWIW</smaller></fontfamily>

=A0

<fontfamily><param>Arial</param><smaller>Ed</smaller></fontfamily>

=A0

<fontfamily><param>Arial</param><smaller>Ed =
Anderson</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>Rv-6A N494BW Rotary =
Powered</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>Matthews, =
NC</smaller></fontfamily>

=
<fontfamily><param>Arial</param><color><param>0000,0000,EEEE</param><small=
er>eanderson@carolina.rr.com</smaller></color></fontfamily></excerpt>=

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