>
> Paul and Doug,
>
> I've added compressor horsepower to the Turbochart spreadsheet. This
> feature could actually come in handy to find the right size
turbine for
> turbocompounding.
>
> In the example shown, the engine is a 2-rotor running AGE 85 ethanol,
> making 421 hp at sea level with a manifold pressure of 41 in/Hg.
>
> At 15,000 feet, this setup would have a compressor pressure ratio of
> 2.45 and the compressor would use 38 hp, assuming adiabatic
efficiency
> of 0.7, which is what the chart shows for the Rotrex supercharger.
>
> I'm going to add a section for the exhaust side as well, but that is
> more difficult.
>
>
> Regards,
>
> Gordon.
>
> I know you guys are serious but.............
> If you think auto gas is hard to find on a cross country try ethanol.
> Only Doug will take the ethanol factory with him as he flies
around the
> world. If you think 8 hours to recharge your electric car is long try
> 8 weeks to get enough ethanol to fly for the next 8 hours.
> What are you going to do while the grass grows Doug?
> I guess you will have time to learn the local language.
>
> We need to make do with the fuel that is readily available.
>
> Paul Lamar
Paul,
You never change do you:) Wasn't that your hand holding a bottle of fine
ethanol near the rotary engine museum in Germany last year? Yea Ok
so it had
some water and grape juice mixed in as well. I am also against making
ethanol out of human feed stocks as well but most of the corn they
are using
in USA and Canada at the moment goes on to become feedstock for
cattle. Yes
there are tons of other alternatives feedstocks and I expect
scientists will
find or create some other crops to act as energy producers. In the short
term you are right ethanol is not going to quench our thirsty cars.
It could
supply the GA community though which is what AGE 85 was specifically
designed to do.
So far in planning the trip I have been able to find breweries or
ethanol
factories in every stop except Fuji and Majoro. I may have to drop ship
several drums there or spend a few weeks fermenting coconuts and
fruits:)
Drip drip drip. This trip is a heck of lot easier than what the earlier
pilots had to deal with. If worst come to worst I can always use
auto gas
to get out of a pinch.
Speaking of ethanol. Gordon what have you been sipping:) 421 Hp. Really?
At those boost levels I could understand about 350 hp on gasoline plus
another 12% for using ethanol. WOW!!! At this rate I'll have to take off
on 3/4 throttle. Let me understand this correctly. If I want only 350 Hp
and I input that number your data at the bottom will show the amount of
boost that is required to obtain this?
The chart is looking better all the time. Thanks.
Doug Fir
I am a bottom line kind of guy.
You mean direct injection heavy fuel Wankel wine.
You veggies really don't care what the price of steak is.. do you?
Paul Lamar
Doug,
Don't worry, I haven't been into the fermented corn.
The number at the bottom is the amount of hp that the compressor
absorbs in order to make the stated boost.
You can use this to approximate turbine size for your recovery
turbine by entering ridiculously high boost levels until you get
compressor power usage of about 100 hp or so. Then simply find a
compressor that maps to this and use the turbine that comes with it.
Kapish? (I'm going to add some bigger turbo maps).
Btw, that 421 hp is not taking into consideration the 50 hp or so
net that you will probably be getting back from the recovery turbine.
Don't forget, you are not likely going to be running at 15,000 feet
with 40 inches of MAP. You should be able to scoot along nicely at
25, which will still give you a pressure ratio of over 2.
Regards,
Gordon.
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