Tom,

   I think Greg's 1.06 A/R turbine hsg is probably in the ballpark..........Your 0.72 hsg will probably be a

screamer off the ground and for racing but may tend to have excess back pressure and over-speed at

cruising altitudes............You may have to have an extra turbine hsg for cruise to reduce wear on your

turbo since your ship will be dual purpose...................The  current group flying Turbo/13B's with TO4

turbine sections have 0.98 to 1.15 A/R hsgs................My TO4E-50 has a 1.15 A/R hsg for cruising at

oxygen levels (12,000 msl +)................Your 20B flows 1/3 again more air than the 13B and of course

all of our projects will take flight testing to prove out all these guesstimates.............IMHO...............<:)

 

 

  Kelly Troyer
"DYKE DELTA JD2" (Eventually)

"13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil Manifold

"TURBONETICS"_TO4E50 Turbo

---

From: Greg Ward <gregw@onestopdesign.biz>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Sat, March 26, 2011 11:52:30 PM
Subject: [FlyRotary] Re: Fw: [FlyRotary] Re: intersting video

Hey Tom;
Ours is the 1.06 A/R, and as you can see, we are going straight out the side of the cowling.
Boost wise, we have a box of springs for the wastegate, and will wait for the dyno tests to find out our best settings.  With the prop configuration we have, we anticipate not a hell of a lot of acceleration, until we hit around 120 Knots, and then watch out........(:-)
Greg


----- Original Message ----- From: "Thomas Giddings" <tom@midwestaviation.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, March 26, 2011 8:09 PM
Subject: [FlyRotary] Re: Fw: [FlyRotary] Re: intersting video


Greg: I am using the GT4294  56Trim  0.60 A/R Water/oil cooled . The 4088 is 54Trim 0.72 A/RI thought this might work better to keep the exhaust from backing up.It will be slow on bottom end ,but start making power around 3500 and up.. We are looking at about the power you are expecting. How much boost are you using? I am also curious what your intake plenum cost to build.

On Mar 26, 2011, at 10:41 PM, Greg Ward wrote:

> Got it right the first time Tom.
> Greg
> 
> ----- Original Message ----- From: "Thomas Giddings" <tom@midwestaviation.net>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Saturday, March 26, 2011 4:02 PM
> Subject: [FlyRotary] Re: Fw: [FlyRotary] Re: intersting video
> 
> 
> Greg: Is your Turbo set up  a GT4088 non bb unit ?
> Tom Giddings
> VP Avionics Sales
> MIDWEST AVIONICS
> 200 Hardy Roberts Dr
> PO Box 219
> West Paducah,KY 42086
> 877-904 9966
> Cell; 727 858-1772
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> tom@midwestaviation.net
> Online Store
> www.midwest-avionics.com
> 
> 
> 
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