X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.3 cv=PbaBeRpd c=1 sm=1 tr=0 a=g1jdh2uyEhWhJa9W+vAOhA==:117 a=R_GH2UhQhlgA:10 a=x7bEGLp0ZPQA:10 a=e8BSqymJ620A:10 a=y4yBn9ojGxQA:10 a=pHCOasZHCbIA:10 a=pGLkceISAAAA:8 a=Ia-xEzejAAAA:8 a=7g1VtSJxAAAA:8 a=Uh0_y0FvLrvVUcQXcW0A:9 a=QEXdDO2ut3YA:10 a=Qa1je4BO31QA:10 a=gvSQh4r-fQ0A:10 a=d46lUuF_AAAA:8 a=3oc9M9_CAAAA:8 a=m-0lX6eQSD6V6Ca6Wn0A:9 a=pF08lK-VcAVbiRg9:21 a=Urk15JJjZg1Xo0ryW_k8:22 a=grOzbf7U_OpcSX4AJOnl:22 a=6lK6DICRFWFJG_1PXtoD:22 From: " argoldman@aol.com" Received: from sonic316-54.consmr.mail.gq1.yahoo.com ([98.137.69.30] verified) by logan.com (CommuniGate Pro SMTP 6.2.14) with ESMTPS id 611009 for flyrotary@lancaironline.net; Thu, 06 Aug 2020 11:36:47 -0400 Received-SPF: pass receiver=logan.com; client-ip=98.137.69.30; envelope-from=argoldman@aol.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=aol.com; s=a2048; t=1596728189; bh=/g2+LMbUUSQHgpYUaxgFcdwh/sM3xetJ7aKEXPbp8yA=; h=Date:From:Reply-To:To:In-Reply-To:References:Subject:From:Subject; b=EOnYoZlVPnUDxhwDswts7ImfP1RqjnTb4MTddVLtlaj41/KVuLUs6QA5Pci09snDGF7WQ36owB8czWapOgsn2Q1D4SECjMD1ZxSfA8gl4leS7diQyW3yGTIZnE/nkPNDA7HslVibb6MSCSr93GHnJeE0o3IkiWByahFGNGQie24hU2wvp7ov9WXWdKx3lzckyxjXB59lXr3Sk+AY74gKITHuhhUqjhHEm2pBcPn6aoAV07bCJP0OhLmZnQp3Cof7jCWKetBHzYM1buYtaQQCSKbB4DnXVqswgwup0WbtwODj7rQ0fGHJ2XX1hrX/hZ32yxHZCPi0wRk+U7p3RQZy5g== X-YMail-OSG: SgrRooEVM1nEm7CFGisXQeJ13TwKSHalkdACinjjTgS0B0X8chppXz5o2mc5vA0 IhhMf9lPb7N1mDRJDCGiO0cHgDYTAcfPE5janmxyqwEhVWOa3cdb20fr1Ry4gZE_oKCF_BO.KJ_T ne56YkJ.m3rmHGYWmGyhVWVOQ_6lEBEinbJ.Fma6XbTU03FyV0wdbBWqZxtZTnD.5uukitLEJwvX wg8xvwA6VdWg63Ory7AMQb6dr71uilOu1hWI3W_TPl2dSOZ70UlcJEjsJ3YZKHhzqS_NpVnR8DOz fyH24nQKENdF2xpn0sdOMscJjlxt75PrEHwcwFaARFVBfvx68GFiIAIOmG1mF5AqFxCb3rTbg7.h 5Djwf1XtkHbJI3qo7L2iczYxfJLpWUzeCdZYE6dojbw6XNuPwm0DCktPOM3us1tN9aIa15Y2ntcr rXA_EtWqsVZV1oqNj7VEy0Jr53g2uOu_Mwmr49ng9G7s34iidIZfE2EWWrCySBYpIPfHZBakN2_I G65zlYdRy184agKPjUBxmzswiJsfZgEoG5WZoie1tqCZqo1OqSE2k21CuvF5ywgegePrvxwaSrIs GiqzQjfJJv_MxsNV.npWlAwRn9sWHZV1L0_h253eA6PhhFPO.gWVKlIccvho.B8Ey4x8xd_xfr5X UCf7zytaACy6pwxnL2akncd9ajwXVwLWL5db4EUnQFxmg0E5VMcdfCwdatb9jJyqckfEZvJkE6Be 7N2VZ2NuUfgroAAIx1VT7Q_G1qe.jJ6xme3Bfm1fQOGGJs6ONlKohBPRYQDKEM_gB.Dv84mS.zes qtFKcf_UU38RU4Gbm76Nt7wloSPWMskOI0vnWHKjGaxYmYYQZXMmOO0DdE_FP8fQul46OZs3kWCC bUsvPpy7dUqwpEWNahJlBWUBxOjNtcUQApLpYBvCaJzZgwHWNmChCb3kkee_x9MEi_6ml.yFNmT5 Z6YbAsYlTJs94lMUpnqUyyS0H5_vK_F5qzFVMGQ_rSd0aFKyGS0OSvziP8aW0rELPb2v1wmsC.rg dJb.4zJNnJdP4NICuXUtYnJ649deI7.ii6nhfcp1Gz1UqvmrR8nzD8WHWXu.G_jEjCp.F_orskjJ b_3JS7QesjJFWNZC1kAaW76sdInsRy.S_eAfDGGIEYm1uzbUFnlfBgoBI8i9OD7lo3GrTrYoLGhh 90lgRygsFFT8w0gzPZUmU91DCWyB1doLu1HEgwaMEDK0Rc9BsjYzdiFPwBTSzofbHI0DegrgvBvg L3mFpJ6.BbA9.Mw-- Received: from sonic.gate.mail.ne1.yahoo.com by sonic316.consmr.mail.gq1.yahoo.com with HTTP; Thu, 6 Aug 2020 15:36:29 +0000 Date: Thu, 6 Aug 2020 15:36:28 +0000 (UTC) Reply-To: argoldman@aol.com To: "flyrotary@lancaironline.net" Message-ID: <1198170300.739989.1596728188392@mail.yahoo.com> In-Reply-To: References: Subject: Re: [FlyRotary] Testing best rpm power setting MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_739988_271192825.1596728188391" X-Mailer: WebService/1.1.16436 aolwebmail Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36 Edg/84.0.522.52 Content-Length: 6804 ------=_Part_739988_271192825.1596728188391 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hy Guy, It is possible that your initial blade angle is set too coarse. With a CS or Variable pitch prop, one of the purposes is to enable max TO R= PM at takeoff. One of the reasons that the RPM builds up after a few second= s is that after you achieve some forward motion the angle of attack to the = blades changes enabling full RPM. There is another possibility, again relating to the prop and that is that b= ecause of the pitch, the prop is actually stalling producing little lift (t= hrust) until forward motion changes the angle of attack and it unstalls. Th= is is accompanied by a rather strange sound coming from the prop until it u= nstalls. I=C2=A0 had that problem with my dragonfly. (Midwest AE110R/ CS prop (airma= ster)=C2=A0 warp drive blades) Initially when I tried it on an early x-plan= e I thought that it was the program, however in real life it happened exact= ly as simulated. I solved that problem by slowly advancing the throttle. -----Original Message----- From: Stephen Izett stephen.izett@gmail.com To: Rotary motors in aircraft Sent: Thu, Aug 6, 2020 9:58 am Subject: [FlyRotary] Testing best rpm power setting Hi guys I=E2=80=99m wanting to inflight test for the best RPM for peak power of our= 4 port Renesis with variable pitch prop (No constant speed control at pres= ent). On Takeoff at Full Fine we hit 6900 after a few seconds and then rpm builds= to 7400 by 500 feet and 110 KIAS=20 I=E2=80=99m wondering if we are well past the peak torque and would be bett= er off at a lower rpm. Am I right in thinking the following would use the aircraft as a Dyno to es= tablish rpm for best power? 1. Set up level flight (auto pilot) 2. Maintain WOT and constant mixture (best power - say 0.9 Lambda - 13.2 AF= R) via Wideband O2 3. Vary RPM in 200rpm increments for 2 minutes each setting between 5600 an= d 7200 by adjusting prop pitch 4. Note Fuel Flow and IAS (Logged on Dynon Skyview) I=E2=80=99m thinking this would give me an indication of best RPM for highe= st power. Our Inlet is just under 19=E2=80=9D long, measured from the side face of th= e engine. So I=E2=80=99m thinking peak torque may be around=C2=A0 6400 rpm. Your insight would be appreciated. Thanks Steve Izett=20 Renesis 4 port RD1C (2.85:1) Inflight Adjustable Prop -- Homepage:=C2=A0 http://www.flyrotary.com/ Archive and UnSub:=C2=A0 http://mail.lancaironline.net:81/lists/flyrotary/L= ist.html ------=_Part_739988_271192825.1596728188391 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hy Guy3D"W=,

It is possible that your initial blade angle is set too coarse.

With a CS or Variable pitch prop, one of the purposes is to enable max= TO RPM at takeoff. One of the reasons that the RPM builds up after a few s= econds is that after you achieve some forward motion the angle of attack to= the blades changes enabling full RPM.

There is another possibility, again relating to the prop and that is t= hat because of the pitch, the prop is actually stalling producing little li= ft (thrust) until forward motion changes the angle of attack and it unstall= s. This is accompanied by a rather strange sound coming from the prop until= it unstalls.

I  had that problem with my dragonfly. (Midwest AE110R/ CS prop (= airmaster)  warp drive blades) Initially when I tried it on an early x= -plane I thought that it was the program, however in real life it happened = exactly as simulated. I solved that problem by slowly advancing the throttl= e.


-----= Original Message-----
From: Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net= >
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, Aug 6, 2020 9:58 am
Subject: [FlyRotary] Testing best rpm power setting

Hi guys

I=E2=80=99m wanting to inflight test for the best RPM for = peak power of our 4 port Renesis with variable pitch prop (No constant spee= d control at present).
On Takeoff at Full Fine we hit 6900 after a few seconds an= d then rpm builds to 7400 by 500 feet and 110 KIAS
I=E2=80=99m wondering if we are well past the peak torque = and would be better off at a lower rpm.

Am I right in thinking the following would use the aircraf= t as a Dyno to establish rpm for best power?

1. Set up level flight (auto pilot)
2. Maintain WOT and constant mixture (best power - say 0.9= Lambda - 13.2 AFR) via Wideband O2
3. Vary RPM in 200rpm increments for 2 minutes each settin= g between 5600 and 7200 by adjusting prop pitch
4. Note Fuel Flow and IAS (Logged on Dynon Skyview)

I=E2=80=99m thinking this would give me an indication of b= est RPM for highest power.
Our Inlet is just under 19=E2=80=9D long, measured from th= e side face of the engine.
So I=E2=80=99m thinking peak torque may be around  64= 00 rpm.

Your insight would be appreciated.
Thanks

Steve Izett
Renesis 4 port RD1C (2.85:1) Inflight Adjustable Prop






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