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[122.148.12.41]) by smtp.gmail.com with ESMTPSA id lq10sm10725209pab.18.2015.09.18.14.16.05 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 18 Sep 2015 14:16:06 -0700 (PDT) Content-Type: multipart/alternative; boundary=Apple-Mail-CDD764D6-D913-4C43-AB16-76484380675B Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) Subject: Re: [FlyRotary] Re: New psru Message-Id: <0A79915A-ACA8-4673-9009-EE1582937A19@gmail.com> Date: Sat, 19 Sep 2015 07:16:06 +1000 References: In-Reply-To: To: Rotary motors in aircraft X-Mailer: iPad Mail (12F69) --Apple-Mail-CDD764D6-D913-4C43-AB16-76484380675B Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi all Just thought I'd add in cruise I find that I sit on 6100 - 6200 rpm with apr= ox 130-140 knots tas which to me is fine cruising speed, also if we could un= load a little more as well with a slightly. Higher ratio would lower fuel co= nsumption a little more I believe as well. Cheers Christian Sent from my iPad > On 19 Sep 2015, at 12:07 am, Bill Bradburry w= rote: >=20 > Neil, > The rotary certainly relies on rpm for its power. That makes it difficult= to make proper selections for ratios, props, etc. I understand that Tracy=E2= =80=99s EC-2 and EC-3 have a rev limiter set at 7500 rpm. I don=E2=80=99t k= now that for a fact, since I have never hit that limit, but that would be a c= onsideration if someone was using either of those controllers. Also, while t= he Renesis is redlined at 8500, I don=E2=80=99t think that you would want to= cruise at 8000 rpm. This makes the rotary a prime candidate for an in flig= ht controllable prop. Currently the only constant speed prop available is t= he MT electric. Perhaps you could add a prop controller to your PSRU? > =20 > Isn=E2=80=99t it amazing how when you build a mousetrap everybody comes ou= t of the woodwork with ideas about how they think it could be better, or in s= ome cases, different! :>) > =20 > Bill > =20 > From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]=20 > Sent: Thursday, September 17, 2015 11:10 PM > To: Rotary motors in aircraft > Subject: [FlyRotary] Re: New psru > =20 > Bill, The ratio is either 2.85 or 3.12 depending what gear set you buy. = My experience is that the Lyco give good torque which is good low speed Hp.= the rotary however has little comparative torque and must compensate with R= PM. I bought a prop for 250 Hp and put it on my rotary with the 2.85 reduct= ion and it killed the rotary. Could only get a little over 6000 RPM. The r= otary real;ly only comes into its own above 7500 RPM, so I am planning on ge= tting something near 8000 rpm for full HP. It seems that the rotary must be= under proped or it will struggle to get the HP required. I may be wrong, b= ut that is my experience. > =20 > From: Bill Bradburry > Sent: Thursday, September 17, 2015 10:54 PM > To: Rotary motors in aircraft > Subject: [FlyRotary] Re: New psru > =20 > Neil, > =20 > This is great news for people wanting to install a rotary! > I don=E2=80=99t know what drives the selection of a gear ratio, but a bett= er ratio would be closer to 2.5 to 1. This would make the use of more stand= ard props easier. With this high a ratio, you will need to run the engine a= t high rpm, or the prop will have to turn at a slow speed requiring a high p= itch on the blades. > =20 > Is the ratio selectable at all? > =20 > Bill > =20 > From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]=20 > Sent: Wednesday, September 16, 2015 11:28 PM > To: Rotary motors in aircraft > Subject: [FlyRotary] New psru > =20 > Gents, > Finally the first PSRU with a reduction of 3.12 to 1. Pict= ured is the basic box which is heavily based on Tracy=E2=80=99s PSRU but wit= h the larger reduction and 2 oil lubricated thrust bearings on the prop sh= aft instead of a single sealed roller bearing in Tracy=E2=80=99s. This psru= will mount directly in place of Tracy's 2.85 reduction PSRU with no modific= ation. > Now to put to test to see if the practice matches the theory. Already= found one fault. The =E2=80=9CO=E2=80=9D ring seal that seals the main body= of the PSRU to the base that attaches to the mounting plate is outside all t= he attachment bolts, which means that the oil can wick down the bolts and ma= ke a lovely mess of your pride and joy. Now looking for more faults as this= is easily fixed. Unlike Tracy's , this PSRU is totally sealed with O rings= to ease dismantling with no clean up of whatever gasket sealer you have had= to use. > Now the terrible part and still undecided as I am yet to cost a damper= on the drive. Sadly it also is not cheap and may yet cost near $500 for a =E2= =80=9Dbit of rubber=E2=80=9D. Then comes a mounting plate as made by Geoff D= oddridge which he sells for around $400 USD. There is no point in me trying= to compete with Geoff as he does a magnificent job at a cheap price. Freig= ht is always a horrible price so he makes the plate and there is no freight= from Aust to be added. > The total cost in Aust dollars (including Geoff=E2=80=99s plate) will b= e around the $5000 which equates to $3500 USD. Then freight of possibly $20= 0. Currently looking at further reduction in price if you source the gear s= et locally saving on freight both ways to Aust and back. I will have to alt= er the way it is constructed so that all the mods can be done by you the bui= lder. Still looking! > So far the progress. Neil. --Apple-Mail-CDD764D6-D913-4C43-AB16-76484380675B Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Hi all
Just thought I'd add i= n cruise I find that I sit on 6100 - 6200 rpm with aprox 130-140 knots tas w= hich to me is fine cruising speed, also if we could unload a little more as w= ell with a slightly. Higher ratio would lower fuel consumption a little more= I believe as well.

Cheers
Christian
<= br>Sent from my iPad

On 19 Sep 2015, at 12:07 am, Bill Bradbur= ry <flyrotary@lancaironlin= e.net> wrote:

=

Neil,

The rotary certainly relies on rpm for i= ts power.  That makes it difficult to make proper selections for ratios, props, etc.  I understand that Tracy=E2=80=99s EC-2 and EC-3 have a rev limiter set at 7500 rpm.  I don=E2=80=99t know= that for a fact, since I have never hit that limit, but that would be a consideration if someone was using either of those controllers.  Also, while the Renesis is redlined at 8500, I don=E2=80=99t think that you would w= ant to cruise at 8000 rpm.  This makes the rotary a prime candidate for an i= n flight controllable prop.  Currently the only constant speed prop available is the MT electric.  Perhaps you could add a prop controller t= o your PSRU?

 

Isn=E2=80=99t it amazing how when you b= uild a mousetrap everybody comes out of the woodwork with ideas about how they th= ink it could be better, or in some cases, different!   :>)

 

Bill

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironli= ne.net]
Sent: Thursday, September 17,= 2015 11:10 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: New p= sru

 

Bil= l,   The ratio is either 2.85 or 3.12 depending what gear set you buy.  My experience is that the Lyco give good torque which is good low speed Hp.&nbs= p; the rotary however has little comparative torque and must compensate with RPM.  I bought a prop for 250 Hp and put it on my rotary with the 2.85 reduction and it killed the rotary.  Could only get a little over 6000 RPM.  The rotary real;ly only comes into its own above 7500 RPM, so I a= m planning on getting something near 8000 rpm for full HP.  It seems that= the rotary must be under proped  or it will struggle to get the HP required.  I may be wrong, but that is my experience.=

 

Sent: Thursday, September 17, 2015 10:54 PM

Subject: [FlyRotary] Re: New psru

 

Neil,

 

This is great news for people wanting t= o install a rotary!

I don=E2=80=99t know what drives the selection of a gear ratio, but a better ratio would be closer to 2.5 to 1.  This would make the use of more standard props easier.  With t= his high a ratio, you will need to run the engine at high rpm, or the prop will have to turn at a slow speed requiring a high pitch on the blades.

 

Is the ratio selectable at all?

 

Bill

 

<= span style=3D"font-size:10.0pt;font-family:Tahoma;color:black;font-weight:bo= ld">From:= Rotary= motors in aircraft [mailto:flyrotary@lancaironli= ne.net]
Sent: Wednesday, September 16= , 2015 11:28 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] New psru= <= /span>

 

Gents,

  &n= bsp;           Finally the first PSRU with a reduction of 3.12  to 1.  Pictured i= s the basic box which is heavily based on Tracy=E2=80=99s PSRU but with the larger reduction and 2 oil lubricated thrust   bearings on the prop shaft instead of a single sealed roller bearing in Tracy=E2=80=99s.  This psru will mount directly in place of Tracy's 2= .85 reduction PSRU with no modification.

  &n= bsp; Now to put to test to see if the practice matches the theory.  Already foun= d one fault. The =E2=80=9CO=E2=80=9D ring seal that seals the main body of the= PSRU to the base that attaches to the mounting plate is outside all the attachmen= t bolts, which means that the oil can wick down the bolts and make a lovely me= ss of your pride and joy.  Now looking for more faults as this is easily fixed.  Unlike Tracy's , this PSRU is totally sealed with O rings to ease dismantling with no clean= up of whatever gasket sealer you have had to use.

  &n= bsp; Now the terrible part and still undecided as I am yet to cost a damper on the drive.  Sadly it also is not cheap and may yet cost near $500 for a =E2=80=9Dbit of rubber=E2=80=9D.  Then comes a mounting plate as made b= y Geoff Doddridge which he sells for around $400 USD.  There is no point in me trying to compete with Geoff as he does a magnificent job at a cheap price.&= nbsp; Freight is always a horrible price so he makes the plate and there is  n= o freight from Aust to be added.

  &n= bsp; The total cost in Aust dollars (including Geoff=E2=80=99s plate) will be around t= he $5000 which equates to $3500 USD.  Then freight of possibly $200. = Currently looking at further reduction in price if you source the gear set locally saving on freight both ways to Aust and back.  I will have to alter the way it is constructed so that all the mods can be done by you the builder.  Still looking!

  &n= bsp; So far the progress.  Neil.

= --Apple-Mail-CDD764D6-D913-4C43-AB16-76484380675B--