Well I just question the old 'truth' about 0.5 hp per cu inch.
I am pretty sure that this was a truth in the old days, and may actually apply
to some certified engines as well, as you are not able to change certified
engines.
However, there are no inherent limit in an engine that says that you can only
take out 0.5 hp out of it.
With 80 octane avgas, and 5.5 compression ratio this was pretty much the
standard back then.
Chances are you own a car or a lawnmower that is getting much more HP out of
those cu inces than 0.5 hp per cu inch.
Any modern industrial engine, today (and yes, they have an RPM band suitable
for direct drive) have more than 0.5 hp per cu inch, and those engies are
designed to do hoooours of long haul.
If you take, like we're talking about here, the AO32, and fix it up in
performance comparable to a modern aircooled VW direct drive engine, you shoud
come pretty much into the 20 hp range.
That would not be a very hot tuning, but a tuning that would be comparable to
the tuning the modern VW engies are tuned to.
The AO32 is a bit over 500 cc, an 80 horse VW is around 2 liter.
So it is not any inherent, built in, redline, or mechanical or physical law
that will prevent an engine to be developed passed 0.5 hp per cu inch. The VW ,
and most other modern engines are a daily testament to that.
The 0.5 hp per cu inch was pretty much a law when it was a law that you could
not fly faster than the speed of sound.
Some got close to those speeds with catastrophic results, with the airplanes
of those days, so that became a law.
How the 0.5 hp per cu inch became a law, I dont know, but it's for sure far
far from the truth today.
Stan Susman <
stanpfa@...
> wrote:
An old(fart) A P told me when I was just a youngin that any direct
drive aero motor should be able to make about .5 HP per inch with mild c/r. so
O-84= 42 O-42=21
O-32 = 16 Works for me and it cheaper then a dyno. that begs the question,
what's the weight of an O-42
Stan Susman <
stanpfa@...
> wrote:
Isaksson Roger <
scratchdeeper@...
> wrote: The AO32 have two ratings a
military standard. The peak rating is 10.8 and the 'continous use' is 6 hp.
Armilite@...
wrote: Hello Ryan:
This info is off
saturnsurplus.com/engine/engine.htm
web site. That
engine only makes 6hp@3600RPM. Now I'm pretty sure that rating is a 10,000ft. I
would bet your turning less RPM's in the Q1. I would guess max HP in airplane
trim is only 15HP. Check with the guys on surpluss engine group.
The 4A084-4 is rated at 20 H.P. @ 3,600 RPM(USG Rating) Now I'm pretty sure
that rating is a 10,000ft also. The guys at surpluss engines rate the 084 in
airplane trim at MAX 46HP.
There is a 2A042-3 rated at 10 H.P. @ 3,600 RPM(USG Rating) I'm pretty sure
that rating is also at 10,000ft. $650 at this web site. This engine I think
would be better suited to your purpose. In airplane trim I would guess MAX HP
around 22-24HP. Check with the guys on surpluss engine group. This engine may
weight more than a 032.
What is the maximum weight of engine for the Q1?
If you want HP and SPEED the rotax engines sounds like the best solution.
Subaru EA71 is small, around 60HP. A custom 1 rotor engine made from a Mazda 13B
using AL racing parts instead of cast iron parts, 110HP@7200RPM. :)
Rich Gillen
Manufacturer: Teledyne
Note: While TCM was the primary contractor for these engines, some were
manufactured by other companies. All of these engines are built to the same
specifications, and all parts are interchangeable regardless of manufacturer
Model Number: 4A032-4
Part Number: 13206E0000-4
National Stock Number: 2805-01-276-5946
Manufacture Date: February 1990
Engine Type: 4 Cylinder, Air Cooled
These are NEW (not Refurbished)4 Cylinder, Horizontally Opposed, Air Cooled
Engines with Overhead Valves, and Electronic Ignition
Rating: 6 H.P. @ 3,600 RPM(USG Rating)
Dimensions: Length: 191/8 Inches
Width: 205/8 Inches
Height: 153/4 Inches
Weight: 110 Pounds
Bore: 2.250 Inch
Stroke: 2.0 Inch
Displacement: 32 Cubic Inches; 524.48cc
Compression: 6.0 to 1
Other Features: Radio Frequency Suppressed
Fungus Proofed
Dual Coil Electronic Ignition
Technical Specs and Service Manuals Included
Available Options KeyShaft: $48.50
Manufacturer: Teledyne
Note: While TCM was the primary contractor for these engines, some were
manufactured by other companies. All of these engines are built to the same
specifications, and all parts are interchangeable regardless of manufacturer
Model Number: 2A042-3
Part Number: 13206E0500
National Stock Number: 2805-00-872-5971
Manufacture Date: Varies: Produced over a long period
Engine Type: 2 Cylinder, Air Cooled
These are NEW (not Refurbished) 2 Cylinder, Air Cooled Engines with Overhead
Valves, 24V Electric Starter, and Electronic Ignition
Rating: 10 H.P. @ 3,600 RPM(USG Rating)
Dimensions: Length: 19 Inches
Width: 24 Inches
Height: 22.10 Inches
Weight: 205 Pounds
Displacement: 42 Cubic Inches
Other Features: Radio Frequency Suppressed
Fungus Proofed
Technical Specs and Service Manuals Included
Manufacturer: Teledyne
Note: While TCM was the primary contractor for these engines, some were
manufactured by other companies. All of these engines are built to the same
specifications, and all parts are interchangeable regardless of manufacturer
Model Number: 4A084-4
Part Number: 13206E1000-4
National Stock Number: 2805-01-276-5947
Manufacture Date: Varies: Produced over a long period
Engine Type: 4 Cylinder, Air Cooled
Rating: 20 H.P. @ 3,600 RPM(USG Rating)
Dimensions: Length: 20 Inches
Width: 28.5 Inches
Height: 22.10 Inches
Weight: 265 Pounds
Displacement: 84 Cubic Inches
Other Features: Radio Frequency Suppressed
Fungus Proofed
**************
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