what every boy needs - yeah seriously

"Anyolmouse" wrote in message
...

"oilsardine" wrote in message
...
: fan-cooled VW/Porsche http://popnet.ch/reichen/HB207/image035.htm
:
: it's the powerplant of a ALFA HB 207, quite a few flying here in
Europe
: http://popnet.ch/reichen/HB207/index.htm
:
:
: "Anyolmouse" schrieb im Newsbeitrag
: ...
:
: wrote in message
:
...
: On Jan 14, 4:55 pm, "Peter Dohm" wrote:
:
: I am really not dissagreeing with you--as the pressure system that
I
: am
: thinking of would use a VW type cooling fan to augment the ram air
: pressure.
: That would be a rather obvious source of added weight and an easily
: visible
: use of power--and would never be popular.
:
---------------------------------------------------------------------
-
: --------
:
: The trouble with the coaxial blower mods was the SAME as with the
: turbo people, in that there simply was not enough fin area for the
: increased density/flow to do much good. Everyone seemed determine
to
: get "60hp" sixty mythical horsepower from an engine that in its most
: powerful configuration only produced 57bhp @ 4400rpm.... and you
only
: got to pull that for something less than 5 minutes.
:
: So you increase the displacement to something seriously silly and
: USING THE SAME HEADS & FIN AREA start pulling as much as 85hp(!!)
from
: that configuration... and wondering why things weren't working
right.
:
: Maximum SUSTAINABLE OUTPUT of the '1600' (displacement 1584cc) under
: Standard Day conditions was something like 36bhp, whereas PEAK
OUTPUT
: can be just about anything you're willing to pay for. It doesn't
blow
: up (although it can) but it blows your bhp right into the porcelain
: fixture.
: SNIP
: -R.S.Hoover
:
: Hope you don't mind my jumping in here Bob. Do you remember the
Porsche
: engine with the cooling fan behind the prop? It was supposed to
: eliminate the need for cowl flaps and also prevent shock cooling
too.
: What happened to it?
:
: --
: Anyolmouse
:

Nice site. It isn't the same configuration as the one I saw in a
magazine here in the US though. There was a large air intake filled with
a fan just behind the prop. The fan was supposed to supply all the
cooling needed and protect the engine from over cooling from ram air as
well as supply cooling during taxi and low speed operation.

--
Anyolmouse

What you describe is basically what I had in mind. It would most commonly
be accomplished with an annular intake; but could be done in several ways,
mostly depending on the specifics of how the prop is driven.

Peter