X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from elasmtp-galgo.atl.sa.earthlink.net ([209.86.89.61] verified) by logan.com (CommuniGate Pro SMTP 5.4.4) with ESMTP id 5507957 for flyrotary@lancaironline.net; Thu, 26 Apr 2012 10:05:22 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.61; envelope-from=n360tg@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=hcArg6Q60Rf8cL5o9UHQ6t8CWyR4cb64EFtv+oImFEiVU5En6paOArSmzSSKC1jA; h=Received:From:Mime-Version:Content-Type:Subject:Date:In-Reply-To:To:References:Message-Id:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [173.163.220.153] (helo=[192.168.6.62]) by elasmtp-galgo.atl.sa.earthlink.net with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.67) (envelope-from ) id 1SNPJN-0002M5-Sb for flyrotary@lancaironline.net; Thu, 26 Apr 2012 10:04:46 -0400 From: Thomas Giddings Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: multipart/alternative; boundary=Apple-Mail-26-659599302 Subject: Re: [FlyRotary] Re: Fixed Pitch props. Date: Thu, 26 Apr 2012 10:04:44 -0400 In-Reply-To: To: "Rotary motors in aircraft" References: Message-Id: <42825CB6-C491-468E-81A4-68F8FA9D81E0@earthlink.net> X-Mailer: Apple Mail (2.1084) X-ELNK-Trace: 77b0437ff618fec294f5150ab1c16ac07c540ca440b21de7224fb463ef93c9e956f9a7800ba3ef4d350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 173.163.220.153 --Apple-Mail-26-659599302 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 I have a Marcotte 2.4/1 PSRU. It is rated at the right HP for my = application. Should be good there. You are right about Tracy's PSRU. = Will not work for this.I have an option for a constant speed ,but = YIKES!!! It is pricey. I will get it if I have too,but am looking at = every other option before I go down swinging on this one. KIND REGARDS Thomas Giddings n360tg@earthlink.net 727 858 1772 On Apr 26, 2012, at 9:38 AM, Bill Bradburry wrote: > Tom, > What engine/PSRU are you planning to put in your Venture? It seems to = me that you are going to have to do some thinking about this combination = if you plan to use a Mazda engine. > =20 > If you use Tracy=92s RD1-C, you will be limited to about 2450 rpm prop = speed (7000 engine) on take off and about 2100 rpm prop speed (6000 = engine) in cruise. That means a heck of a lot of pitch to get a cruise = speed of 240 knots! I think that would work out to around 138 inches of = pitch. On takeoff, you would probably think the prop was feathered! > =20 > Tracy=92s RD1-A or B has a ratio of 2.17 and turns backward to normal = aircraft, but I don=92t know if he has them rated at high HP. > =20 > You may want to try and buy a Mistral PSRU so you can fit a constant = speed prop of some kind. I don=92t know if that is even possible?? > =20 > I hope this msg will generate some comments from people with more = knowledge about this than I and maybe they will have some nuggets you = can use. > =20 > Bill B > =20 > From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] = On Behalf Of Thomas Giddings > Sent: Thursday, April 26, 2012 7:14 AM > To: Rotary motors in aircraft > Subject: [FlyRotary] Re: Fixed Pitch props. > =20 > Thanks for your info. I did contact Craig Catto and here is his = response: > =20 > Hello Tom, > That is going to be quite a challenge to fit. We make them for the = 540 Berkut, and that is about a 285mph aircraft and have done one for a = E-racer turbo 540 at 350HP doing over 300mph. > I do not think I want to challenge the auto conversion, just the power = curve many times seems hard to fit. We know the curve of the Lyc engine = very well and so not such a big deal to fit in these types of = applications. Easiest way for you to fit it is probably with a MT. > All the best, > Craig > =20 > I was surprised at his answer as i thought he did Tracy's prop. The = speed of the Venture will not be that much more then what he described. = It may be the high HP I will be using.Any more suggestions would be = appreciated. >=20 >=20 > KIND REGARDS > Thomas Giddings > n360tg@earthlink.net > 727 858 1772 > =20 > =20 > =20 > On Apr 26, 2012, at 1:28 AM, William Jepson wrote: >=20 >=20 > Another possibility is Senessich (never could spell that), they have a = new ground adjustable prop. Carbon blades aluminum hub, which is = supposed to be designed around RV speed and HP. They are supposed to = offer a 2 and 3 blade option. Bill Jepson >=20 > On Apr 25, 2012 8:53 PM, "Michael McMahon" wrote: > I=92ve been thinking along the same lines. The one person I=92ve = heard of often as a potential builder is Craig Catto, www.cattoprops.com = . Last time I looked his props were around $3,000, I think, but I have = no idea if that is current. There is also a new possibility, which is = to have the prop manufactured on a resin printer and then wrap it in = carbon fiber. I=92ve done a little research on that front and spoke to = a manufacturer last year at the CAF=C9 Electric Flight Symposium (this = weekend in Santa Rosa!) who confirmed that it=92s possible and is = already being done for military drones. > =20 > Please post your findings! > =20 > Thanks, > =20 > Mike > =20 > From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] = On Behalf Of Thomas Giddings > Sent: Wednesday, April 25, 2012 6:57 PM > To: Rotary motors in aircraft > Subject: [FlyRotary] Fixed Pitch props. > =20 > I am curious what you folks might recommend for a fixed pitch prop = builder for my project. I will have a lot of excess power and do not = think it would be as difficult to get an acceptable level of performance = with a lot less money and simplicity. Your thoughts > KIND REGARDS > Thomas Giddings > n360tg@earthlink.net > 727 858 1772 > =20 > =20 > =20 > =20 --Apple-Mail-26-659599302 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 I = have a Marcotte 2.4/1 PSRU. It is rated at the right HP for my = application. Should be good there. You are right about Tracy's PSRU. = Will not work for this.I have an option for a constant speed ,but = YIKES!!! It is pricey. I will get it if I have too,but am looking at = every other option before I go down swinging on this one.
KIND = REGARDS
Thomas Giddings
72= 7 858 1772



On Apr 26, 2012, at 9:38 AM, Bill Bradburry = wrote:

=

Tom,

What engine/PSRU are you planning = to put in your Venture?  It seems to me that you are going to have to do = some thinking about this combination if you plan to use a Mazda = engine.

 

If you use Tracy=92s = RD1-C, you will be limited to about 2450 rpm prop speed (7000 engine) on take off and about 2100 rpm = prop speed (6000 engine) in cruise.  That means a heck of a lot of pitch = to get a cruise speed of 240 knots!  I think that would work out to around = 138 inches of pitch.  On takeoff, you would probably think the prop was = feathered!

 

Tracy=92s RD1-A or B has a ratio of 2.17 and turns backward to normal aircraft, but I don=92t know if he has them rated at high HP. =

 

You may want to try and buy a = Mistral PSRU so you can fit a constant speed prop of some kind.  I don=92t know = if that is even possible??

 

I hope this msg will  generate = some comments from people with more knowledge about this than I and maybe = they will have some nuggets you can use.

 

Bill = B

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Thomas Giddings
Sent: Thursday, April 26, = 2012 7:14 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Fixed Pitch props.

 

Thanks for your info. I did contact Craig Catto and here is his response:

 <= /u1:p>

Hello = Tom,

That is = going to be quite a challenge to fit.   We make them for the 540 Berkut, = and that is about a 285mph aircraft and have done one for a E-racer turbo 540 at = 350HP doing over 300mph.

I do not = think I want to challenge the auto conversion, just the power curve many times = seems hard to fit. We know the curve of the Lyc engine very well and so not = such a big deal to fit in these types of applications.  Easiest way for = you to fit it is probably with a MT.

All the = best,

Craig

 <= /u1:p>

I was surprised at his answer as i thought he did Tracy's prop. = The speed of the Venture will not be that much more then what he described. It may be the high HP I = will be using.Any more suggestions would be = appreciated.



KIND = REGARDS

Thomas = Giddings

727 858 = 1772

 

 

 

On Apr 26, 2012, at 1:28 AM, William Jepson = wrote:



Another possibility is Senessich (never could spell that), they have a new = ground adjustable prop. Carbon blades aluminum hub, which is supposed to be = designed around RV speed and HP. They are supposed to offer a 2 and 3 blade = option. Bill Jepson

On Apr 25, 2012 8:53 PM, "Michael McMahon" <afm528@gmail.com> = wrote:

I=92ve been thinking along the same lines.  = The one person I=92ve heard of often as a potential builder is Craig Catto, = www.cattoprops.com .  Last time I looked his props were around $3,000, I think, but I = have no idea if that is current.   There is also a new possibility, = which is to have the prop manufactured on a resin printer and then wrap it in = carbon fiber.  I=92ve done a little research on that front and spoke to a manufacturer last year at the CAF=C9 Electric Flight Symposium (this = weekend in Santa = Rosa!) who confirmed that it=92s possible and is already being done for military drones.

 

Please post your = findings!

 

Thanks,

 

Mike

 =

From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Thomas = Giddings
Sent: Wednesday, April = 25, 2012 6:57 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] = Fixed Pitch props.

 

I = am curious what you folks might recommend for a fixed pitch prop builder for my project. = I will have a lot of excess power and do not think it would be as difficult to = get an acceptable level of performance with a lot less money and simplicity. = Your thoughts

KIND REGARDS

Thomas Giddings

 =

 

 

 

=

= = --Apple-Mail-26-659599302--