Continental O-200 ?

On 19 Sep 2006 18:59:35 -0700, "Bret Ludwig"
wrote:


Peter Dohm wrote:
What diameter of prop can you turn at 4000 rpm?

A Volkswagen is NOT a good direct drive aircraft engine because it
produces good power at 3200 to 3800 rpm. But it's a hell of a lot
easier to put a redrive on a VW than an O-200.

Actually, 46 to 48"

The VW 1600 was used that way with considerable success in the early KR-2
aircraft. However, that only meant 60 to 65 HP with the small displacement,
and the modestly oversized cylinders which would be fitted without fairly
radical case machining provided only a very modest addition of take-off
power. Cruising speed was only about 115 kts within the thermal capacity of
the stock heads--which has been discussed previously in this NG--so pilots
who were heavier or wanted to fly faster sought more oomph.


Since VW engines in race cars and hot rods (sand rails, etc) operate
under continuous power at higher power settings than this (I have
driven Bugs up tall mountains in 90 degree weather at 25+ inches Hg at
3000-3700 rpm for as long as the mountain lasted, which was longer than
enough to heat the head all the way through) this thermal analysis
theory is flawed. The 356/912 Porsche has a head not much bigger and
they run for hours on the Autobahn flat out.

The difference is these engines have a cooling blower, where most
aircraft installations run them as free cooled engines.

Free air cooling and direct drive are simple. In the old A-65 and the
airframes it went into that worked okay. But the time has come to
recognize that for an airplane to not be something looked on as an
antique, it needs a liquid cooled engine with a flywneel, redrive,
single lever power control and enough power to haul fat people and lots
of crap out of high and hot fields with healthy margins to spare.

totally clueless nonsense brown eyes.
aircraft have a pressure plenum. almost no aircooled aircraft engine
are free cooled engines. everything with a cowling uses the very
effective technique of the pressure plenum.

I'd suggest you learn about them.
Stealth Pilot

On 19 Sep 2006 17:46:12 -0700, "Bret Ludwig"
wrote:


Stealth Pilot wrote:
snip

you are definately in need of a laxative.

If you'd ever flown an O-200 you would realise that you are wrong.
did you know that at 4,000rpm they deliver 150hp.


What diameter of prop can you turn at 4000 rpm?

A Volkswagen is NOT a good direct drive aircraft engine because it
produces good power at 3200 to 3800 rpm. But it's a hell of a lot
easier to put a redrive on a VW than an O-200.

What is TBO of a O-200 at 4000 rpm?

Except for a very esoteric and crowd-unappealing, masturbatory sport
of F1 air racing no one is going to turn a O-200 at these RPMs. So you
are talking smack.

so I gather you find Formula 1 aircraft too hot to handle and the
engines too difficult to understand.

there is no TBO at 4,000 rpm and I never suggested there was.

I dont know where vw engines come in a discussion on the new O-200 LSA
engine but from personal experience both engines perform quite well as
direct drive powerplants with two and three bladed propellers.

sorry I missed a question there brown eyes. what diameter of prop?
dunno. ask the formula one guys they've managed to find suitable props
for nearly 50 years now.
when you're next as oshkosh have a look at wittman's hangar wall.
there were rows of them in the last photo I saw of the wall.

Stealth Pilot

Stealth Pilot wrote:
snip

Except for a very esoteric and crowd-unappealing, masturbatory sport
of F1 air racing no one is going to turn a O-200 at these RPMs. So you
are talking smack.

so I gather you find Formula 1 aircraft too hot to handle and the
engines too difficult to understand.


I find F1 air racing a misnomer in the extreme and a snoozefest. I go
to Reno to see warbirds, big warbirds with big engines. When those
annoying gnats are out there I am at the casinos or doing other
interesting things like watching girls in cherries dresses do the
paddleball thing at Mia's.

Stealth Pilot wrote:
snip
If you'd ever flown an O-200 you would realise that you are wrong.

I soloed behind one at 18. My ears still ring.

On 19 Sep 2006 18:15:13 -0700, "Bret Ludwig"
wrote:


Stealth Pilot wrote:
snip
If you'd ever flown an O-200 you would realise that you are wrong.

I soloed behind one at 18. My ears still ring.

it might take a few hours but the ringing will ease. :-)
Stealth Pilot