<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake &raquo;</TD></TR><TR><TD CLASS="quote">
Here's another strange configuration for you...
http://www.wpafb.af.mil/museum/engines/eng30a.htm

The French LeRhone & German Oberursel engines were 'rotary' engines which doesn't mean the same thing as Mazda... On an airplane, the crankshaft came out the back of the engine & was bolted to the firewall. So the ENTIRE ENGINE was spinning around. They bolted the propeller directly to the crankcase.
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that is some crazy **** right there

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">The French LeRhone & German Oberursel engines were 'rotary' engines which doesn't mean the same thing as Mazda... On an airplane, the crankshaft came out the back of the engine & was bolted to the firewall. So the ENTIRE ENGINE was spinning around. They bolted the propeller directly to the crankcase.</TD></TR></TABLE>
Wrong, the engine was stationary, but the crankshaft was spinning the propeller, lots of these engines still being used. They're called radial engines by the way.
Oh and having the engine spin around on itself wouldnt work, because at 2000rpm it would disintegrate beacuse theres no way you can balance it, especially with ww1 technology. This engine was 1917's era creation. Not to mention none of the sparkplugs or fuellines, intake manifold or exhaust pipes would be able to be run.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">If I remember correctly, one of the reasons for the whole engine spinning was better air cooling, but I can't remember if there was another reason or not. Do you know?</TD></TR></TABLE>
They're aircooled by air drawn through the prop and blown past the engine, engine was stationary.


Modified by Flashmn at 7:45 AM 8/11/2005


Modified by Flashmn at 7:47 AM 8/11/2005

 

"Radial" refers to the configuration of cylinders radially around a shared crankcase. So technically, the LeRhone is a rotary-radial engine because it DOES spin. In fact, it acted as such a big flywheel that when it was used the aircraft generally had bigger ailerons on one side. See the Fokker DR-1 & some Nieuports...

Most radial engines didn't spin, but I believe it was done for cooling. They may have even used the 'centifugal force' for fuel feed up to the heads. Long after wards, one of the biggest problems with radial engines was always uneven cooling. Especially multi-row radials like the R-4360 with 4 rows!

 

Hmmh, I guess you're right about it
http://www.pilotfriend.com/air...e.htm

...Never ever seen one being used.

 

Good info. I knew they existed, I just couldn't find anything on them.

 

Flashman, that's a pretty cool article. I never thought about how they don't need counterweights on the crank, that's pretty cool.

I've never seen one run, only in museums. It was like 20 years ago that Cole Palen had one in his replica DR-1 at Old Rhinebeck.
http://www.oldrhinebeck.org/co...okker

But check this one out. Read the caption!
http://www.oldrhinebeck.org/co...2.htm

Disco... that particular engine had 100 hp, from 782 cubic inch displacement. Still impressed?

 

ok you guys came through for me on that question now i got another one for you

its 3 question about the same topic i will explain each one.

what do you call an engine that when the piston is at TDC (top dead center) the very top of the piston or the crown sits flat and even with the deck of the block?

what do you call an engine that when the piston is at TDC the very top of the piston sits just below the deck of the block?

what do you call an engine that when the piston is at TDC the very top of the piston sits above the deck of the block?

that was the question my teacher left us to think about over the weekend.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">Disco... that particular engine had 100 hp, from 782 cubic inch displacement. Still impressed?</TD></TR></TABLE>
Well it was cool in ww1 spec, but then again, what RPM it had that power, not alot thats for sure.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">what do you call an engine that when the piston is at TDC (top dead center) the very top of the piston or the crown sits flat and even with the deck of the block?

what do you call an engine that when the piston is at TDC the very top of the piston sits just below the deck of the block?

what do you call an engine that when the piston is at TDC the very top of the piston sits above the deck of the block?</TD></TR></TABLE>
If we're talking about piston shapes here, they would be as follows:
-Flathead
-Recessed/dished/cupped head
but the last one has several possibilities, but I would say Dome/Wedge or Crown head

 

thats what i though but i didnt know if it was that simple i guess so thanks

so what they are really talking about is the piston design

 

Sounds like that to me.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Flashmn &raquo;</TD></TR><TR><TD CLASS="quote">
Well it was cool in ww1 spec, but then again, what RPM it had that power, not alot thats for sure.</TD></TR></TABLE>Yeah, that's true. I couldn't find rpm, but newer props were geared down to maybe 1800 rpm. Since this didn't have a gearbox, & the plane was much slower, maybe it was closer to 1000 rpm??

Normally flathead means something completely different. I haven't heard that term being used to describe the piston crown.

Flat head or "L" head engine is like an old lawnmower. The head has NOTHING in it, it's just flat... The valves are in the block next to the piston.