----- Original Message -----

From: John Slade

To: Rotary motors in aircraft

Sent: Tuesday, June 22, 2010 10:29 PM

Subject: [FlyRotary] Re: TurboCharger as a muffler

>the engine seems to be producing "scarey power"
Chris,
Power is only "scary" when it goes away unexpectedly.
John

BTW - I often call my wife from the hold-point so she knows what time I took off. We can hear each other fine.

Chris Barber wrote:

As I have mentioned recently my new turbo quiets my 13b significantly.  My Honda Shadow Saber motorcycle is now louder. I could actually use my cell phone while in the plane.  In fairness, I did tell the caller, my mom, to hold on a sec while I walked back into the hangar....but it IS quieter and I do get the kewl sounds of the turbo/BOV.....zoom zoom zoom....bbswooooosh

 

I wish I could help with a good single source for or turbo info.  The guys at www.turbochargers.com were helpful both on the phone and in person.

 

I was about to state what John just said about the compression, but he beat me to it.  I am using the standard low compression rotors though.

 

I am running 3lb boost and the engine seems to be producing "scarey power"...but it could just be me.  3 lb boost, at 34 MP and just over 6300 rpm WOT. RDb 2.17 Redrive.

 

Chris Barber

Houston, GSOT

---

From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of Rob [rob@mum.edu]
Sent: Tuesday, June 22, 2010 9:05 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] TurboCharger as a muffler

Hi everyone,

I am preparing my Bruce Turrentine 20B hybrid engine for my BD-4. As I am thinking about all the details it occured to me that a turbo would be a great muffler based on the experience of those on this list who have them. It turns out that the price of a good turbo has come down to the point that it is almost as cheap as it would be to fabricate a good inconell exaust system. Then I can use it for boosting the engine too.

Is it reasonable to think like this? What do you all think of this proposal?

 

 

The only problem is that my 20B has the high compression 9.7:1 rotors and I'm concerned about detenation. Is it possible with the right components to maintain sealevel pressure on take off at full throttle and then maintain 30" MP as I get higher?

 

I have yet to figure out what components I need to do all this. I have been reading as much as I can about turbocharging but I can't seem to get good answers to the above questions.  Does anyone know a good place to go to learn more about turbocharging for aircraft or how to select components for a specific mission?

 

 

I would appreciate any comments or criticism on my musings. Brief or extensive coments are welcome.

 

Thanks everyone.

 

Robert Bollinger

Currently flying a BD-4 with a Ford V6

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