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Radial Questions. (Read 262 times)
Aug 7
th
, 2005 at 9:16am
Jakemaster
Ex Member
Actual, only one. Do real radials turn with the prop? On the Caudron I just got for fs, the engine rotates. It just doesn't seem right to me.
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Reply #1 -
Aug 7
th
, 2005 at 10:02am
Felix/FFDS
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The Caudron you got - probably a WW1 - is not a "radial" per se.
Through WW1, rotary engines were used in which the crankshft was stationary while the engine block rotated around it. The propeller was bolted directly to the engine block.
Examples were the Gnome, LeRhone, Oberursel and a few others, including the Bristol Rotary (BR) that powered the Sopwith Camel.
Radial engines, while developed in that time, didn't come into the forefront until after the first World War.
In essence, your model is "right".
The rotary engine's torque is what gave the Camel (to name one airplane) it's legendary turning maneouverability - it could turn like a bat in hell to the right, but slightly sluggish to the left...... Rotary engines though had two speeds - full on, or full off, (fuel flow)... plus the pilots of single seaters probably never suffered from constipation - the l;ubricatin system was a total loss system, and so the exhaust included the spent CASTOR oil...
As an aside, Siemens Schukert developed a contra rotating rotary engine in which the prop spun opposite the engine block.
Felix/
FFDS
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Reply #2 -
Aug 7
th
, 2005 at 11:09am
Jakemaster
Ex Member
oh. I thought that's what it was. Thanks
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Reply #3 -
Aug 7
th
, 2005 at 5:38pm
turbo_skylane
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ido believe it but i dont.
does this stuf happen in fs?
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Reply #4 -
Aug 7
th
, 2005 at 5:56pm
Felix/FFDS
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Quote:
ido believe it but i dont.
does this stuf happen in fs?
???
I don't understand the question? If the question is can rotary engines be animated in FS, of course. For flightsim modelling purposes they're just another propeller!
Felix/
FFDS
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Reply #5 -
Aug 7
th
, 2005 at 6:02pm
C
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Quote:
???
I don't understand the question? If the question is can rotary engines be animated in FS, of course. For flightsim modelling purposes they're just another propeller!
Neither did I...
Have you seen the nice rotary (Pup) and radial (Gladiator) I left for you in the photo section Felix?
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Reply #6 -
Aug 7
th
, 2005 at 10:04pm
Jakemaster
Ex Member
the question isn't really about fs. It's about the engines in general
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Reply #7 -
Aug 7
th
, 2005 at 10:55pm
beaky
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"Radial" refers to the geometry of the engine- the cyinders are arranged around the crankshaft like spokes on a wheel (a line between the center and edge of a circle is called a "radius", so...).
Not all radials are rotaries, but all rotaries are radials.
Even a Wankel rotary, but that's a whole 'nother thing...
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Reply #8 -
Aug 8
th
, 2005 at 6:36am
Hagar
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My Spitfire Girl
Costa Geriatrica
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To avoid confusion, early aero engines with the propeller bolted direct to the engine & the whole caboodle rotating around a fixed crankshaft are referred to as Rotary type. The later & more familiar type with a stationary crankcase & cylinder assembly fixed to the airframe with the prop attached to a rotating crankshaft are called Radials.
Quote:
Rotary engines though had two speeds - full on, or full off, (fuel flow)...
Contrary to popular belief, some WWI rotary engines have a rudimentary throttle. I found this article by Kermit Weeks describing the arrangement used on the popular Le Rhone rotary as fitted to aircraft like the Camel. This is actually a smaller (80 hp) Le Rhone rotary on his Standard E-1 but I imagine the principle is the same as I know the Camel had a throttle.
http://www.fantasyofflight.com/aircraftpages/standarde1.htm
Quote:
Kermit Comment
The 80 hp Le Rhone was a very dependable engine. It was used on many early World War I aircraft. The Le Rhone design is one of the few rotary engines that have any amount of throttle control. As in all rotary engines, the engine crankshaft is bolted to the airplane and the propeller is bolted to the engine, where the whole combination spins around as one unit.
All rotaries utilize a blip switch, which is generally mounted on the top of the control stick. With it, the pilot can control the engine power by turning the electricity from the magnetos to the spark plugs on and off. The Le Rhone design is one of the few rotaries that have any degree of throttle ability. There are 2 levers in the cockpit to control the engine. One controls a tapered needle valve that regulates how much fuel the engine receives. The other operates a slide valve located in an air box, mounted on the rear of the fixed crankshaft. The slide valve opens and closes, which determines how much air the engine is allowed to take in. When the air and the fuel enter the hollow, fixed crankshaft and are sucked into the engine crankcase. Maximum engine speed is 1200 rpm. With the 2 levers, he can throttle the engine down to a speed around 800 rpm. Below that point, the engine just quits. Since 800 rpm is too fast for taxiing and landing, the blip switch on the control stick is utilized to kill the engine and keep the aircraft slowed down. With the 2 levers to control the fuel and the air, the pilot is the carburetor.
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