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From: "george lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Guru - single rotor
Date: Fri, 27 Jan 2006 19:59:46 +1000
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Subject: GURU suppling single rotor parts!

> I've just this morning spoken to the chief engineer of GURU (X-Treme
> Rotaries) Rohan Ambrose. It took me a while but it has been extremely
hectic
> at GURU, but he took the time to ring me about the single- and yes Paul I
> asked about the other parts as well. As you can imagine it was a long and
> rather complex discussion shooting off in all directions, so I can't
recall
> all the prices etc.
>
> The bottom line for you enquiries is to contact Suzie at X-Treme
> Rotaries and she will provide all the information/ prices ( and photo's)
and
> refer to Rohan for complex enquiries - he just can't handle all the
e-mails
> and do his job as chief engineer at the same time.
>
> BTW RX8 rotors can be wire cut by GURU, it is extremely accurate as he
> explained, but to cut an RX8 he needs to go to 3mm otherwise there is a
> step( between old and new depth) which could interfere with the apex seal.
> So to use an RX8 rotor for PP it requires 3mm seals. he can also cut in
> windows in the inside of the Rotor housing to retain some centre seal
> support for larger PP. The method he uses is to screw in the port insert-
it
> is made out of solid so can be any size.He has found that this method is
> less prone to leaking - it could be the filler he's using ?
>
> The e-shafts are make out of EN 36A, they are CNC'd shot peened, ground
and
> Carburised. I recommended another material as carburising is a hotter heat
> treatment than Nitriding and can cause some distortion.
>
> They are looking at aluminium housing and have some made for testing -
it's
> a surface treatment and I suggested it may not stand up. He said he would
> test it to it's limits.
>
> The through bolts ( housing) are 4340
>
> The prices aren't cheap but their reasonable compared to 'one- offs' and
the
> quality is definitely 'there'.
>
> He will do single e-shafts but needs a minimum of ten to make it cost
> effective  'economy of scale' etc. He is currently setting up for a
'single' dyno run.
> He explained there are enormous torque reversals ( term?) in the single
> rotor, so balancing is critical. The advice I posted previously on
balancing
> is supported by Guru and the US experts.
> Hope this helps some!
> George ( down under)