flyrotary@lancaironline.net Mailing List Archive

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

http://www.forcedinductions.com

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

Bob,

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 ??..............

Thanks Again,

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