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Addendum,
These charts are at a volumetric efficiency of 87% and an intake temp 120F.........They
may not completely accurate as the Rotary can beat 87% EV from what we have heard.....
Kelly Troyer "Dyke Delta"_13B ROTARY Engine "RWS"_RD1C/EC2/EM2 "Mistral"_Backplate/Oil Manifold
From: Kelly Troyer <keltro@att.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Fri, August 13, 2010 4:54:56 PM
Subject: [FlyRotary] Rotary Air Consumption Charts (was) Turbo Questions
Bob, John and Group,
Sorry if I am beating this subject to death but in my web-searching I came
across "Air consumption Charts" in lbs/per/min for both the 13B and 20B at
3400 to 9500 rpm............Sizing turbochargers to engines uses lbs/per/min as
one of the factors.............I had never seen charts like this before and thought
they may helpful to some of the group..........Links to both charts are below as
is the link to the company where I found it.............FWIW
http://www.forcedinductions.com/13B.htm
http://www.forcedinductions.com/20B.htm
Kelly Troyer "Dyke Delta"_13B ROTARY Engine "RWS"_RD1C/EC2/EM2 "Mistral"_Backplate/Oil Manifold
From: "Rogers, Bob J." <BRogers@FDIC.gov>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Fri, August 13, 2010 11:49:06 AM
Subject: [FlyRotary] Re: Turbo Questions
Kelly,
I do not know which wheel is in my turbo. I expect the larger wheel (68 mm) to turn a little more slowly, since it has a larger surface area to absorb the exhaust, but it should not make much difference. Either one should be OK. The Turbonetics people can probably explain the performance differences between the two wheel sizes.
Bob
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Kelly Troyer
Sent: Thursday, August 12, 2010 3:44 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Turbo Questions
Thanks much for the info.................Just one more question..............Info from "Turbonetics"
says the 1.15 a/r turbine housing is limited to the F1-65 mm or F1-68 mm turbine wheel.......
Do you have info as to what turbine wheel was installed in your 60-1 turbo ??..............
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
From: "Rogers, Bob J." <BRogers@FDIC.gov>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, August 12, 2010 1:39:26 PM
Subject: [FlyRotary] Re: Turbo Questions
Kelly,
I limit my takeoff power to no more than 42 “ of manifold pressure (“MP”), usually just 40” . At altitudes of 5,000 feet and above, I generally run no more than about 36 “ MP (15 GPH) and 180 knots. Engine RPM is about 5,800. The turbo is capable of considerably more boost than this, but I have to watch engine water and oil temps at higher power settings. I do not want to run more than 200 degrees on oil or water and prefer 180 degrees. I can maintain these temps (even on hot days) with cowl flap settings from closed to full open as long as I keep the power settings at or below those described above. One day, I climbed to 11,000 feet and my GPS groundspeed (with a slight tailwind) was 213 knots. MP was 36”, RPM 6,000. I have a 68” diameter x 84 pitch
Prince P-tip fixed pitch prop coupled to the RWS 2.17/1 reduction unit.
Bob |
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