Standards for H.P. corr. factors ??

Wow, big post. I'll just hit a couple points to respond to. ;-)

Automotive engines today are exceptionally reliable. No where did I
impugn automotive engines. It is also obvious that all readers are not
clear on the use of the adjective "many". Many does not mean all or even
imply a majority, it at most implies more than "several".

I may have jumped in without fully understanding the response to the OP.
That never happens around here, does it? g

Interestingly, it is most always not the core auto engine that
experiences failure when an auto engine conversion has problems, but the
prop speed reducer, or fuel system, or non original fuel system, or
whatever else has been added or re-engineered by the experimenter.

What the heck does that have to do with it?

I was making a point that the experimenter that builds his ow PSRU does so
at much risk, unless it is really well engineered. There are comercial
units out there that have very good reliability records. People get into
trouble when they try to improve on the standard conversion, usually. You
are correct though, the engine and PSRU and any other additions that make
the whole package is what really counts in the end.

I am not a certified engine bigot and I believe experimental aviation
should be experimental ( I also believe homebuilts should be homebuilt as
well) I was more specifically aiming at the vendors targeting the
experimental market with uncertified engines that make outlandish claims
regarding reliability, fuel burn and most especially power.

I get a kick out of the 100 HP VW's, especially.
--
Jim in NC

I get a kick out of the 100 HP VW's, especially.
--
Jim in NC
-------------------------------------------------------------------------------------------

Even 80hp should have you rolling on the floor :-)

After waving the magical 80hp flag at a tent-full of round-eyed
admirers the next kerchief out of his sleeve is usually "3.3 gph"
followed by a round of patting himself on the back in routine worth of
a French circus. Are we great or what?

Truth is, if you know engines and want some serious fun, get a bunch
of real engine guys together and show them the Aero-vee assembly
video. I swear to God it's the funniest thing I've seen in years.
Seriously. Most guys assume it's a put-on. When they realize it's
being sold as a 'expert advice' their reactions range from blowing
beer out their nose to simply sitting there in stunned amazement.

-R.S.Hoover

wrote in message
oups.com...

I get a kick out of the 100 HP VW's, especially.
--
Jim in NC
--------------------------------------------------------------------------
-----------------

Even 80hp should have you rolling on the floor :-)

After waving the magical 80hp flag at a tent-full of round-eyed
admirers the next kerchief out of his sleeve is usually "3.3 gph"
followed by a round of patting himself on the back in routine worth of
a French circus. Are we great or what?

Truth is, if you know engines and want some serious fun, get a bunch
of real engine guys together and show them the Aero-vee assembly
video. I swear to God it's the funniest thing I've seen in years.
Seriously. Most guys assume it's a put-on. When they realize it's
being sold as a 'expert advice' their reactions range from blowing
beer out their nose to simply sitting there in stunned amazement.

-R.S.Hoover

I am much more of a theoretical engine guy than a real engine guy, and IIRC
it took a little effort on your part to set me straight on the thermal
limits of the VW heads; so I have faith that you will help to clear up
whatever misconceptions I may have on this as well.

With that disclaimer...

it seems to me that there is an additional way to look at the 80HP VW issue:
80HP from 130CID at 3450RPM is plausible in standard air; for a time limited
by cooling, etc. However, my limited knowledge of propellers suggests that
either the RPM or the manifold pressure must change quite soon--even with an
engine that could handle the load continuously--and I am not convinced that
it is achievable more than momentarily

Soooo.... the 3.3GPH may be the real key to the puzzle. Given a fixed
pitch prop, there is no way for this all to happen at the most efficient RPM
and MP. Therefore, 3.3GPH means to me that cruise is less than 43HP; since
about 13 horsepower hours per gallon is the best it can get under the
circumstances and with the type of engine and fuel system in use.

And then... dividing 43 by 0.75 it becomes clear that, when the subsequent
round table discussion is included, this is at least a 3-Beer video.

Peter
(Also starting to wonder about that little jewel from down under... )

I get a kick out of the 100 HP VW's, especially.
--
Jim in NC

--------------------------------------------------------------------------
-----------------

Even 80hp should have you rolling on the floor :-)

After waving the magical 80hp flag at a tent-full of round-eyed
admirers the next kerchief out of his sleeve is usually "3.3 gph"
followed by a round of patting himself on the back in routine worth of
a French circus. Are we great or what?

Truth is, if you know engines and want some serious fun, get a bunch
of real engine guys together and show them the Aero-vee assembly
video. I swear to God it's the funniest thing I've seen in years.
Seriously. Most guys assume it's a put-on. When they realize it's
being sold as a 'expert advice' their reactions range from blowing
beer out their nose to simply sitting there in stunned amazement.

-R.S.Hoover

I am much more of a theoretical engine guy than a real engine guy, and
IIRC
it took a little effort on your part to set me straight on the thermal
limits of the VW heads; so I have faith that you will help to clear up
whatever misconceptions I may have on this as well.

With that disclaimer...

it seems to me that there is an additional way to look at the 80HP VW
issue:
80HP from 130CID at 3450RPM is plausible in standard air; for a time
limited
by cooling, etc. However, my limited knowledge of propellers suggests
that
either the RPM or the manifold pressure must change quite soon--even with
an
engine that could handle the load continuously--and I am not convinced
that
it is achievable more than momentarily

Soooo.... the 3.3GPH may be the real key to the puzzle. Given a fixed
pitch prop, there is no way for this all to happen at the most efficient
RPM
and MP. Therefore, 3.3GPH means to me that cruise is less than 43HP;
since
about 13 horsepower hours per gallon is the best it can get under the
circumstances and with the type of engine and fuel system in use.

And then... dividing 43 by 0.75 it becomes clear that, when the
subsequent
round table discussion is included, this is at least a 3-Beer video.

Peter
(Also starting to wonder about that little jewel from down under... )


It seems that I got so wrapped up in my writing that I forgot just how close
that cruising power might be to the practical maximum continuous....

Peter :-(

On Jul 7, 1:39 pm, "Peter Dohm" wrote:

I am much more of a theoretical engine guy than a real engine guy, and IIRC
it took a little effort on your part to set me straight on the thermal
limits of the VW heads; so I have faith that you will help to clear up
whatever misconceptions I may have on this as well.
----------------------------------------------------------------------------------------

Dear Peter,

The magnesium crankcase is referred to as aluminum, old, used parts
are referred to as 'factory new,' bearing shells are installed atop a
splatter of spray-paint... But the humor has more to do with the
overall incompetence of the video rather than the fallacious
statements. The video is larded with hilarious Mechanical Sight-Gags
that can't be described without losing the essence of the humor; you
NEED to see it for yourself.

The Beer Fountain erupted when, upon completing some mundane task, the
assembler puts thumb to forefinger and gives the camera a close-up
'okay' for all the deaf-mutes in the audience. Doing it once was
funny but the second time even Old Stoneface cracked up: 'This guy
makes Dubya look like a Whiz Kid.'

Giiven the nature of the medium -- the ability to re-shoot a take
until they got it right -- it's hard to understand why they would
leave in so many scenes showing them doing things wrong. That caused
a bit of discussion, some arguing that it had to be a put-on... until
someone pointed out that they probably HAD re-shot and edited TO THE
BEST OF THEIR ABILITY. Which makes the video a ****-up of truly
monumental proportions.

Like I said, you've GOT to see it. This thing is a collector's item.

-R.S.Hoover

wrote in message
oups.com...
On Jul 7, 1:39 pm, "Peter Dohm" wrote:

I am much more of a theoretical engine guy than a real engine guy, and
IIRC
it took a little effort on your part to set me straight on the thermal
limits of the VW heads; so I have faith that you will help to clear up
whatever misconceptions I may have on this as well.

--------------------------------------------------------------------------
--------------

Dear Peter,

The magnesium crankcase is referred to as aluminum, old, used parts
are referred to as 'factory new,' bearing shells are installed atop a
splatter of spray-paint... But the humor has more to do with the
overall incompetence of the video rather than the fallacious
statements. The video is larded with hilarious Mechanical Sight-Gags
that can't be described without losing the essence of the humor; you
NEED to see it for yourself.

The Beer Fountain erupted when, upon completing some mundane task, the
assembler puts thumb to forefinger and gives the camera a close-up
'okay' for all the deaf-mutes in the audience. Doing it once was
funny but the second time even Old Stoneface cracked up: 'This guy
makes Dubya look like a Whiz Kid.'

Giiven the nature of the medium -- the ability to re-shoot a take
until they got it right -- it's hard to understand why they would
leave in so many scenes showing them doing things wrong. That caused
a bit of discussion, some arguing that it had to be a put-on... until
someone pointed out that they probably HAD re-shot and edited TO THE
BEST OF THEIR ABILITY. Which makes the video a ****-up of truly
monumental proportions.

Like I said, you've GOT to see it. This thing is a collector's item.

-R.S.Hoover

The search for a copy is now under way!

Thanks,
Peter