Today's Message Index:
----------------------
1. 07:13 AM - Re: Hybrid Bernard Swing Arm Steerable Tailwheel (echobravo4)
2. 11:08 AM - Re: Ethanol (taildrags)
3. 04:06 PM - Re: Re: Ethanol (Stuart Brown)
4. 06:03 PM - Re: The quiet after a good day in the shop..... (aviken)
5. 08:34 PM - Re: Re: Ethanol (John Cox)
6. 11:52 PM - Re: Re: The 'Piet Builder's Bible' Project - Want In? (Clif Dawson)
Message 1
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| Subject: | Re: Hybrid Bernard Swing Arm Steerable Tailwheel |
Westcoastpiet has lot of pictures to use in making your tailwheel
--------
Earl Brown
I may not have gone where I intended to go, but I think I have ended up where I
intended to be.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=447023#447023
Message 2
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Douwe; while I don't claim to be "in the know", as a fire protection engineer I
do have some knowledge of fuels and I can read a table of physical properties
of fuels. Strictly from the "fuel as energy" standpoint, ethanol has an energy
content of about 11,590 Btu per lb and gasoline (including 100LL avgas) has
an energy content of about 18,700 Btu per lb. This means when you're burning
a blend of gasoline and ethanol, you're leaving some power on the table. Here
in Oregon, regulations mandate the sale of "E10" in some areas of the state
and at certain times of the year. This is a blend of 90% gasoline and 10% ethanol
and it results in a fuel with somewhere between 3% and 4% less energy than
straight gas. To put it in practical terms, but greatly oversimplifying, your
engine that produces 100HP running on avgas will only produce 96-97HP on E10
mogas. Granted, the E10 will cost quite a bit less and that's the attraction
of it. As you've read from other posts here, there are downsides and one of
them is the fact that ethanol is incompatible with a lot of materials.
Another downside is the potential for vapor lock. Ethanol has a lower boiling
point than straight gasoline, so it is less tolerant of high temperatures under
the cowling and it can vaporize in the fuel lines or anywhere it's close to
a hot surface. A vapor pocket or bubble in the fuel system can stop the flow
of fuel... "vapor lock". The problem is increased in the summer, of course, because
when we land with a nice warmed-up engine and taxi over to the fuel pump
and shut down, the areas inside the cowling become heat-soaked and since there
is no flow of cooler fuel in the lines when the engine is shut down, the fuel
can vaporize and lock the system, making startup more difficult.
The reason why you don't see cars sitting all over the shoulders of the road with
vapor lock is because most vehicles now are fuel injected or they have fuel
pumps that deliver the fuel under pressure, not gravity, and the boiling point
of a liquid increases as the pressure increases. You know this from your camping
experiences when you try to boil water while camping up in the mountains.
It boils at a lower temperature up where the atmospheric pressure is lower,
and your beans never cook! Of course this same effect means that flying at higher
altitudes lowers the boiling point of fuel that contains ethanol, but most
Piets fly down pretty low where that isn't a big factor. More than you wanted
to know, I'm sure ;o)
--------
Oscar Zuniga
Medford, OR
Air Camper NX41CC "Scout"
A75 power
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=447027#447027
Message 3
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Steve,
I have been "washing" Ethanol from gasoline and burning it in my old Bonanza for
years. It's a simple process and requires patience. I determine how much ethanol
is in the fuel, then add enough water to produce a 50/50 mixture of water
and alcohol. I process 45 gallons at a time as my cone shaped tank only holds
50 gallons. The yield is 40 gallons of Ethanol free gasoline, if the gas contains
10% Ethanol. You loose about 3 octane points when the ethanol is removed.
Right now in NJ, avgas is $5.35/ gallon and regular gas is $1.98. My finished
product cost is about $2.20/ gallon and I burn about 12 gallons per hour. $58.50/
hour v.s. $24.20.
Stu
Sent from my iPad
Message 4
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| Subject: | Re: The quiet after a good day in the shop..... |
By the way, I love your shop and your building style....
My next door neighbor's bed room window is pretty close to my small shop.
I have to pace myself on those nights when I can't sleep and I am up at 3:30
4:00 AM. I want to work in the shop, but my power tools are too noisy and hammering
is also a problem, so I have to find something quiet to work on.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=447035#447035
Message 5
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Great Read.
John Cox
Aurora, OR
On Sep 12, 2015 11:10, "taildrags" <taildrags@hotmail.com> wrote:
>
> Douwe; while I don't claim to be "in the know", as a fire protection
> engineer I do have some knowledge of fuels and I can read a table of
> physical properties of fuels. Strictly from the "fuel as energy"
> standpoint, ethanol has an energy content of about 11,590 Btu per lb and
> gasoline (including 100LL avgas) has an energy content of about 18,700 Btu
> per lb. This means when you're burning a blend of gasoline and ethanol,
> you're leaving some power on the table. Here in Oregon, regulations
> mandate the sale of "E10" in some areas of the state and at certain times
> of the year. This is a blend of 90% gasoline and 10% ethanol and it
> results in a fuel with somewhere between 3% and 4% less energy than
> straight gas. To put it in practical terms, but greatly oversimplifying,
> your engine that produces 100HP running on avgas will only produce 96-97HP
> on E10 mogas. Granted, the E10 will cost quite a bit less and that's the
> attraction of it. As you've read from other posts here, ther!
> e are downsides and one of them is the fact that ethanol is incompatible
> with a lot of materials.
>
> Another downside is the potential for vapor lock. Ethanol has a lower
> boiling point than straight gasoline, so it is less tolerant of high
> temperatures under the cowling and it can vaporize in the fuel lines or
> anywhere it's close to a hot surface. A vapor pocket or bubble in the fuel
> system can stop the flow of fuel... "vapor lock". The problem is increased
> in the summer, of course, because when we land with a nice warmed-up engine
> and taxi over to the fuel pump and shut down, the areas inside the cowling
> become heat-soaked and since there is no flow of cooler fuel in the lines
> when the engine is shut down, the fuel can vaporize and lock the system,
> making startup more difficult.
>
> The reason why you don't see cars sitting all over the shoulders of the
> road with vapor lock is because most vehicles now are fuel injected or they
> have fuel pumps that deliver the fuel under pressure, not gravity, and the
> boiling point of a liquid increases as the pressure increases. You know
> this from your camping experiences when you try to boil water while camping
> up in the mountains. It boils at a lower temperature up where the
> atmospheric pressure is lower, and your beans never cook! Of course this
> same effect means that flying at higher altitudes lowers the boiling point
> of fuel that contains ethanol, but most Piets fly down pretty low where
> that isn't a big factor. More than you wanted to know, I'm sure ;o)
>
> --------
> Oscar Zuniga
> Medford, OR
> Air Camper NX41CC "Scout"
> A75 power
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=447027#447027
>
>
Message 6
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| Subject: | Re: The 'Piet Builder's Bible' Project - Want In? |
I'm assuming you have Two Years Before The Mast and Voyage of the Cachalot?
This message is Piet related because there are wings and control cables
involved.
Clif
Life is uncertain. Eat dessert first.
>
> Clif: thank you for the book recommendations. I've always wanted to learn
> how to sail and "The Craft of Sail" sounds like a wonderful addition to my
> reading stack for this fall and winter! I'll nestle it in between
> Hornblower and Aubrey & Maturin books ;o)
> Oscar Zuniga
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