X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-qy0-f180.google.com ([209.85.216.180] verified) by logan.com (CommuniGate Pro SMTP 5.4.1) with ESMTPS id 5113541 for flyrotary@lancaironline.net; Sun, 04 Sep 2011 12:28:03 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.216.180; envelope-from=coastiefamily4@gmail.com Received: by qyk31 with SMTP id 31so2616484qyk.4 for ; Sun, 04 Sep 2011 09:27:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=pWYz82iFieKdPS/pzco2ysRhwP9WNnL1NII/LucfpkU=; b=EUkYDW4L3DcqxuMn1Il5P3tT6N1roGuNOKFS9JAhcxUZ1r5EAeJUTQq63H/0VXlK34 tW1cal4Q9jTWdvznUEr++CJmz1PDDp9WI55PepF06p/nKxYrjwSBTQ8E2EnjW3bncmvn hAhYqtT5PqxZnr1cxm+UpPUJjqsbvUtqJpjCg= MIME-Version: 1.0 Received: by 10.229.218.131 with SMTP id hq3mr109566qcb.192.1315153646351; Sun, 04 Sep 2011 09:27:26 -0700 (PDT) Received: by 10.229.220.134 with HTTP; Sun, 4 Sep 2011 09:27:26 -0700 (PDT) In-Reply-To: References: Date: Sun, 4 Sep 2011 10:27:26 -0600 Message-ID: Subject: Re: [FlyRotary] Tip speed was : [FlyRotary] Re: 20B Tuning From: coastiefamily4 To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0016363b942aea742904ac201111 --0016363b942aea742904ac201111 Content-Type: text/plain; charset=ISO-8859-1 Ed, I did the same calculations at: http://www.culverprops.com/pitchselection.htm I do believe there is a typo, I would not have caught it if everyone on the forum did not catch it. I appreciate the input from everyone. I currently have tunnel vision with attempting to get the engine to idle correctly. I am going to try to run the engine on the secondaries to see if it runs correctly per the recommendation of Tracy. On Sun, Sep 4, 2011 at 9:39 AM, Ed Anderson wrote: > ** > According to an on-line prop tip speed calculator at 70F, you can spin the > 76 " dia prop at 2550 rpm and have a tip speed of around mach 0.75 which > still keeps it a bit on the low side of the desirable range for tip speed > (0.88 - 0.92Mach). However, there could be other reasons for the > restriction as has been mentionded such as structure limits, tip flutter, > prop track disc, etc. > > Ed > > *From:* coastiefamily4 > *Sent:* Sunday, September 04, 2011 11:24 AM > *To:* Rotary motors in aircraft > *Subject:* [FlyRotary] Re: 20B Tuning > > I think there must be a typo in the manual, I rechecked it this morning and > is reads 2150RPM. Instead of 2150 RPMs on the prop I am thinking it should > be 2550RPMs for a 76inch prop for a tip speed limit of 850fps equating to > 7250 engine RPMs. I will call the manufacture on Tuesday to verify my > calculations. > > I appreciate everyone's comments. > > On Sun, Sep 4, 2011 at 8:07 AM, Charlie England wrote: > >> ** >> Wow. How big is it? >> >> >> On 09/03/2011 10:50 PM, coastiefamily4 wrote: >> >> Tip speed >> >> On Sat, Sep 3, 2011 at 9:18 PM, Kelly Troyer wrote: >> >>> Is the rpm limit because of diameter (tip speed) or a structural blade >>> limitation ?.............. >>> >>> Kelly Troyer >>> *"DYKE DELTA JD2" (Eventually)* >>> "13B ROTARY"_ Engine >>> "RWS"_RD1C/EC2/EM2 >>> "MISTRAL"_Backplate/Oil Manifold >>> "TURBONETICS"_TO4E50 Turbo >>> >>> *From:* coastiefamily4 >>> *To:* Rotary motors in aircraft >>> *Sent:* Saturday, September 3, 2011 6:06 PM >>> *Subject:* [FlyRotary] Re: 20B Tuning >>> >>> The prop is adjustable, it is hydraulically controlled. I current have >>> it set to the fine pitch setting. >>> >>> On Sat, Sep 3, 2011 at 4:51 PM, Bobby J. Hughes wrote: >>> >>> If it's adjustable you may need more pitch. A 2150 rpm limit seem very >>> low. Bobby >>> >>> >>> Sent from my iPad >>> >>> On Sep 3, 2011, at 5:57 PM, "coastiefamily4" >>> wrote: >>> >>> This is not full throttle, I have to stop at 6000 RPMs do to the 2150 >>> RPM limit on my prop. I am using a VARI PROP, it is great so far. I have >>> plenty of throttle, just prop limited. >>> >>> On Sat, Sep 3, 2011 at 3:44 PM, William Wilson wrote: >>> >>> 23.3 is just about exactly what would be expected. >>> >>> Perhaps the throttle is not opening all the way? You would have to have >>> a pretty convoluted intake to lose 3" of pressure in it. >>> >>> >>> On Sat, Sep 3, 2011 at 3:40 PM, wrote: >>> >>> At what density altitude was that measured? Maybe your MAP needs to be >>> calibrated. >>> >>> Brian Trubee >>> >>> >>> >>> -----Original Message----- >>> From: coastiefamily4 >>> To: Rotary motors in aircraft >>> Sent: Sat, Sep 3, 2011 1:50 pm >>> Subject: [FlyRotary] 20B Tuning >>> >>> My static MAP before starting the engine was 23.3 >>> >>> >>> >>> >>> >>> >>> >> >> > --0016363b942aea742904ac201111 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Ed,
=A0 I did the same calculations at:

=A0http://www.culverprops.com/pitchselecti= on.htm

I do believe there is a typo, I would not have caught it = if everyone on the forum did not catch it.=A0 I appreciate the input from e= veryone.=A0 I currently have tunnel vision with attempting to get the engin= e to idle correctly.=A0 I am going to try to run the engine on the secondar= ies to see if it runs correctly per the recommendation of Tracy.=A0




On Sun, Sep 4, 2011 at 9:39 AM, = Ed Anderson <eanderson@carolina.rr.com> wrote:
According to an on-line prop tip speed calculator= at 70F,=20 you can spin the 76 " dia prop at 2550 rpm and have a tip speed of aro= und mach=20 0.75 which still keeps it a bit on the low side of the desirable range for = tip=20 speed (0.88 - 0.92Mach).=A0 However, there could be other reasons for the= =20 restriction as has been mentionded such as structure limits, tip flutter, p= rop=20 track disc, etc.
=A0
Ed

Sent: Sunday, September 04, 2011 11:24 AM
To: Rotary motors in aircraft <= /div>
Subject: [FlyRotary] Re: 20B Tuning

I think there must be a typo in the manual, I rechecked it t= his=20 morning and is reads 2150RPM.=A0 Instead of 2150 RPMs on the prop I am=20 thinking it should be 2550RPMs for a 76inch prop for a tip speed limit of 8= 50fps=20 equating to 7250 engine RPMs.=A0 I will call the manufacture on Tuesday to= =20 verify my calculations.=A0

I appreciate everyone's comments.
On Sun, Sep 4, 2011 at 8:07 AM, Charlie England = <ceengland@bellsouth.net>=20 wrote:
Wow. How big is it?=20


On 09/03/2011 10:50 PM, coastiefamily4 wrote:=20
Tip speed

On Sat, Sep 3, 2011 at 9:18 PM, Kelly Troyer= <= keltro@att.net> wrote:
Is the rpm limit because of diameter (tip speed) or a=20 structural blade limitation ?..............
=A0
Kelly Troyer
"DYKE DELTA JD2" (Eventually)
"13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2"MISTRAL"_Backplate/Oil=20 Manifold
"TURBONETICS"_TO4E50 Turbo

From:=20 coastiefamily4 <coastiefamily4@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net= >
Sent: Saturday, Septem= ber 3, 2011=20 6:06 PM
Subject:=20 [FlyRotary] Re: 20B Tuning

The prop is adjustable, it is hydraulically controlled.=A0 I=20 current have it set to the fine pitch setting.

On Sat, Sep 3, 2011 at 4:51 PM, Bobby J. Hughes <bhughes@qnsi.net> wrote:
If it's adjustable you may need more pitch. A 2150 rpm lim= it seem=20 very low. =A0 =A0Bobby


Sent from my iPad

On Sep 3, 2011, at 5:57 PM, "coastiefamily4" <= ;coastiefamily4@gmail.com> wrote:

This is not full throttle, I have to stop at 6000 RPMs do to= the=20 2150 RPM limit on my prop. I am using a VARI PROP, it is great so= =20 far.=A0=A0 I have plenty of throttle, just prop limited.=20

On Sat, Sep 3, 2011 at 3:44 PM, William Wilson <fluffysheap@gmail.com> wrote:
23.3=20 is just about exactly what would be expected.

Perhaps th= e=20 throttle is not opening all the way?=A0 You would have to have = a=20 pretty convoluted intake to lose 3" of pressure in it.=20


On Sat, Sep 3, 2011 at 3:40 PM, <bktrub@aol= .com> wrote:
At what density altitude was that measured? Maybe your M= AP=20 needs to be calibrated.
=A0
Brian Trubee



-----Original=20 Message-----
From: coastiefamily4 <coastiefamily4@g= mail.com>
To: Rotary=20 motors in aircraft <flyrotary@lancaironline.net= >
Sent: Sat,=20 Sep 3, 2011 1:50 pm
Subject: [FlyRotary] 20B Tuning
My static MAP before starting the engine was 23.3=20









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