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From: "Mike Wills" <rv-4mike@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: N.A. Renesis to turbo
Date: Wed, 10 Feb 2010 18:22:50 -0800
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You built a mill, a furnace, and are casting your own impeller for the 
supercharger that you designed and built? When did you have time to build an 
airplane???? I feel so inadequate....

Mike

--------------------------------------------------
From: "Ernest Christley" <echristley@nc.rr.com>
Sent: Wednesday, February 10, 2010 7:08 AM
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: N.A. Renesis to turbo

> David Leonard wrote:
>> HI Don,
>> I think a turbo is not a bad idea and will definitely add available horse 
>> power.  But first a reminder of a few of the downsides:
>> Added weight and complexity
>> Additional cooling requirements
>> Some loss of efficiency due to exhaust back pressure.
>>  Ok, now forget about that stuff and lets pick out a turbo.
>>
>>  On Sat, Feb 6, 2010 at 6:21 PM, Don Wallker <drwalker@gbis.com 
>> <mailto:drwalker@gbis.com>> wrote:
>>
>>     Dear list, Turbo flyers and especially David Leonard,
>>       I've 16 flying hours on my RV-8 with a Renesis and all of
>>     Tracy's stuff and a Catto 76/88.  The airplane flys great, just
>>     like an RV, no gliding time, and about 36 hours on the ground. SPECS
>>     Full throttle 8,000'   174 mph indicated, 2450 on the prop, water
>>     185, oil 205,
>>     Climb out 110 mph, rate of climb, 1250'/min.  Field elevation 5046.
>>
>>     These are not bad numbers, but I would like better.
>
>
>
> How much better are your really looking for, Don?  I've been working on a 
> "turbo" solution that either minimizes or eliminates the drawbacks that 
> David lists.  The solution I have doesn't allow for nearly as much 
> manifold pressure, but adds no additional moving parts to the engine.
>
> I'm taking the intake air from around the side of the gearbox, through its 
> mounting plate.  The flywheel will have an impeller attached to it.  I 
> built a fiberglass shroud to enclose the area between the gearbox mounting 
> plate and the engine.  Intake air is taken from this centrifugal pump.
>
> Pros:
> -I never have to worry about surges, wastegates, pop-off valves, etc.  The 
> blower will never exceed the engine RPM.
> -I don't have to deal with an intercoolers, wastegates, pop-off valves, 
> etc or the problems that failure of these things would cause.  I'm not 
> pumping the pressure up that high.
> -I don't have to deal with exhaust back pressure.
> -I don't have to deal with exhaust heat.
> -Lightweight.  I'm getting away with just the weight of a shroud and an 
> impeller.  Projected to be less than 5lbs.
>
> Cons:
> -Power increase will be limited to about 20Hp.  Exact figure won't be 
> known until I get it put together.  The test will be several static 
> run-ups, with intake air taken from the pump, without the pump, and 
> without the pump with the air blocked.  The last test is to see how much 
> Hp the pump is eating.
> -I still have to install a real muffler.
>
> At this point in the development, I have a gcode program to mill the 
> impeller out of foam on the CNC mill I built.  The foam model will be used 
> for casting.  I've built a furnace capable of melting enough aluminum to 
> do the casting from.  I nearly have the lathe I bought in the fall set up 
> so that I can do some post-cast cleanup.  I just have to finish building 
> the quick change tool post holders.
>
> Once I get the impeller built, I just have to finish building the muffler 
> and a prop and I'm ready for my first start.
>
>
> --
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