X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from poplet2.per.eftel.com ([203.24.100.45] verified) by logan.com (CommuniGate Pro SMTP 5.3.4) with ESMTP id 4178911 for flyrotary@lancaironline.net; Thu, 25 Mar 2010 17:21:10 -0400 Received-SPF: none receiver=logan.com; client-ip=203.24.100.45; envelope-from=lendich@aanet.com.au Received: from sv1-1.aanet.com.au (mail.aanet.com.au [203.24.100.34]) by poplet2.per.eftel.com (Postfix) with ESMTP id D58061738C6 for ; Fri, 26 Mar 2010 05:20:34 +0800 (WST) Received: from ownerf1fc517b8 (203.171.92.134.static.rev.aanet.com.au [203.171.92.134]) by sv1-1.aanet.com.au (Postfix) with SMTP id DB091BEC018 for ; Fri, 26 Mar 2010 05:20:32 +0800 (WST) Message-ID: <02DB6D63E8D9480B8A795279F444689C@ownerf1fc517b8> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Turbo Planning Date: Fri, 26 Mar 2010 07:20:29 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0031_01CACCB4.D0949B20" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Antivirus: avast! (VPS 100325-1, 03/25/2010), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0031_01CACCB4.D0949B20 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Bobby, You are probably aware of this but for some who may no be so aware- it's = all about volumetric efficiency (VE), and engine can only breathe as = much as the volume of the compression chamber allows it to. In our case = 40cu". However you can pack more in with pressure -Turbo, supercharger = and tuned inlet. The PP does give max breathing capacity but relies in inlet speed to = gain any advantage in raising the pressure from atmospheric, the tuned = inlet will maximize this pressure at a given rpm. Inlet speed is maximized by the inlet tube diameter and 44mm is the max = speed for max VE to 7,500 rpm. Over 7,500 requires a bigger inlet but = reduces the inlet speed. I do however accept Bills argument about HP and performance - for a = standard engine. George ( down under)=20 fyi It doesn't seem to matter what you have done to the engine.ported, PP, = turbo, supercharger. Boosted engines can make a lot of HP at much lower rpms. A PP should = also.=20 Bobby -------------------------------------------------------------------------= ----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] = On Behalf Of Bill Bradburry Sent: Thursday, March 25, 2010 7:26 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Turbo Planning=20 Mike, Don didn't report speed. I took his pitch and rpm and figured it. = That speed at cruise is what he would get with no slippage or "lift" = from the prop. Most of the folks with the Catto are actually getting = higher speeds than would be calculated which indicates that the prop is = producing "lift", not slippage.=20 =20 But his engine rpm with that big prop are higher than any I have seen. = With the rotary, rpm =3D horsepower. If you aint making the rpm, you = aint making the horsepower. It doesn't seem to matter what you have = done to the engine.ported, PP, turbo, supercharger. If you look at the = dyno charts that are all over the web, you will see that torque is = pretty flat after about 4K, about 150 ft lbs. The horsepower is around = 150 at 6K, maybe 180 at 7K, and 200 at 7.5K. You can get more = horsepower than that, but only if you scream it up to 8K or 8.5K. All = the charts I have seen are within 10 horsepower of each other at all = rpms. The difference in total horsepower is always a higher max rpm. =20 We all talk about wanting to cruise at 5800 and make 200 horsepower.it = aint happening! Not with the rotary. =20 Bill B =20 -------------------------------------------------------------------------= ----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] = On Behalf Of Mike Wills Sent: Thursday, March 25, 2010 1:17 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Turbo Planning=20 Bill, =20 I went back and looked at Don's previous post. Saw reference to climb = performance, RPMs, and temps, but no speed numbers. Has he previously = reported cruise speeds over 200? Last post from him that I saw with any = speed numbers reported 174MPH IAS at 8000. If he's over 200 now, wow = those are good numbers! =20 Mike Wills =20 From: Bill Bradburry=20 Sent: Wednesday, March 24, 2010 9:15 PM To: Rotary motors in aircraft=20 Subject: [FlyRotary] Re: Turbo Planning=20 =20 Those are the best numbers I have seen with anyone with a Renesis so = far. In fact, I have not heard of numbers that good on any 13B. Don is = getting over 200 MPH with a cruise prop and climbing at over 1400 fpm = with it. The only way he is going to do better is either with an = electric CS prop and/or turbo. If he shaves the prop off to say, 74", = he will get a couple hundred more rpm, but will probably lose in total = thrust. Diameter is a big determiner in thrust.=20 =20 I would like more pictures of Dons intake and exhaust! =20 Bill B =20 -------------------------------------------------------------------------= ----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] = On Behalf Of Al Gietzen Sent: Wednesday, March 24, 2010 3:05 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Turbo Planning=20 1. When I read your stats in your first paragraph, the first thought = that comes to mind is that there is too much prop. =20 =20 Ditto. =20 Al G -------------------------------------------------------------------------= ----- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_0031_01CACCB4.D0949B20 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 Bobby,
You are probably aware of this but for = some who may=20 no be so aware- it's all about = volumetric=20 efficiency (VE), and engine can only breathe  as much as the volume = of the=20 compression chamber allows it to. In our case 40cu". However you can = pack more=20 in with pressure  -Turbo, supercharger  and tuned = inlet.
 
The PP does give max breathing capacity = but relies=20 in inlet speed to gain any advantage in raising the pressure from = atmospheric,=20 the tuned inlet will maximize this pressure at a given rpm.
 
Inlet speed is maximized by the inlet = tube diameter=20 and 44mm is the max speed for max VE to 7,500 rpm. Over 7,500 requires a = bigger=20 inlet but reduces the inlet speed.
 
I do however accept Bills argument = about HP=20 and performance - for a standard engine.
George ( down under) 
 
fyi
 
 
It doesn=92t seem to matter what = you have=20 done to the engine=85ported, PP, turbo, supercharger.
 
Boosted engines can make a lot of HP at much lower rpms. A PP = should=20 also.
 
Bobby

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of Bill=20 Bradburry
Sent: Thursday, March 25, 2010 7:26 = AM
To:=20 Rotary motors in aircraft
Subject: [FlyRotary] Re: Turbo = Planning=20

Mike,

Don didn=92t report speed.  I took his = pitch and=20 rpm and figured it.  That speed at cruise is what he would get = with no=20 slippage or =93lift=94 from the prop.  Most of the folks with the = Catto are=20 actually getting higher speeds than would be calculated which = indicates that=20 the prop is producing =93lift=94, not = slippage. 

 

But his engine rpm with that big prop are = higher than=20 any I have seen.  With the rotary, rpm =3D horsepower.  If = you aint=20 making the rpm, you aint making the horsepower.  It doesn=92t = seem to=20 matter what you have done to the engine=85ported, PP, turbo, = supercharger. =20 If you look at the dyno charts that are all over the web, you will see = that=20 torque is pretty flat after about 4K, about 150 ft lbs.  The = horsepower=20 is around 150 at 6K, maybe 180 at 7K, and 200 at 7.5K.  You can = get more=20 horsepower than that, but only if you scream it up to 8K  or = 8.5K. =20 All the charts I have seen are within 10 horsepower of each other at = all=20 rpms.  The difference in total horsepower is always a higher max=20 rpm.

 

We all talk about wanting to cruise at 5800 = and make=20 200 horsepower=85it aint happening!  Not with the=20 rotary.

 

Bill B

 

From:=20 Rotary motors in aircraft = [mailto:flyrotary@lancaironline.net] On=20 Behalf Of Mike Wills
Sent: Thursday, March 25, 2010 = 1:17=20 AM
To: = Rotary motors in aircraft
Subject: [FlyRotary] Re: Turbo = Planning=20

Bill,

 

I went back and looked = at Don's=20 previous post. Saw reference to climb performance, RPMs, and temps, = but no=20 speed numbers. Has he previously reported cruise speeds over 200? Last = post=20 from him that I saw with any speed numbers reported 174MPH IAS at=20 8000. If he's over 200 now, wow those are good=20 numbers!

 

Mike=20 Wills

 

From: Bill=20 Bradburry

Sent:=20 Wednesday, March 24, 2010 9:15 PM

To: Rotary motors in = aircraft=20

Subject:=20 [FlyRotary] Re: Turbo Planning =

 

Those are the best numbers I have seen with = anyone=20 with a Renesis so far.  In fact, I have not heard of numbers that = good on=20 any 13B.  Don is getting over 200 MPH with a cruise prop and = climbing at=20 over 1400 fpm with it.  The only way he is going to do better is = either=20 with an electric CS prop and/or turbo.  If he shaves the prop off = to say,=20 74=94, he will get a couple hundred more rpm, but will probably lose = in total=20 thrust.  Diameter is a big determiner in=20 thrust. 

 

I would like more pictures of Dons intake = and=20 exhaust!

 

Bill B

 

From:=20 Rotary motors in aircraft = [mailto:flyrotary@lancaironline.net] On=20 Behalf Of Al Gietzen
Sent: Wednesday, March 24, 2010 = 3:05=20 AM
To: = Rotary motors in aircraft
Subject: [FlyRotary] Re: Turbo = Planning=20

1. When I read your stats in your first = paragraph, the=20 first thought that

comes to mind is that there is too much = prop. =20

 

Ditto.

 

Al=20 G

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