Fixing Roll

[Wolf_Rider]

flywheel is part of the crankshaft though and has no air drag as such


"torque: prop rotates clockwise, aircraft rotates anti-clockwise"

crankshaft rotates (on which the prop is attached) clockwise, inside the engine block. the crankshaft rotates because of the pistons driving the shaft, the pitons push against the engine block, because the pistons/ cranshaft is the movable object when the engine block is securely mounted on a firm surface. when there is no firm mount, the engine block floats... so the crankshaft/ pistons pushes against the engine block which in turn is moved in the opposite direction

prop wash is applicable until airspeed is greater

[bongodriver]

torque is not really an effect purely of air resistance, it is more to do with inertia, the flywheel is a heavy mass (just like a prop) and causes resistance to the power of the engine, that energy needs to find its way somewhere, inevitably it will cause the whole engine block to rotate in the opposite direction, I know.. I've seen it, an engine on a static test bench being revved will lurch in the opposite direction of crankshaft rotation, essentially we are in agreement on this effect but with slightly differing perceptions on its cause.

propwash is a factor as soon as the power is applied and is harder to control at low speeds because the aerodynamic controls havent got a 'bite' on the airflow

[Wolf_Rider]

basic law of motion... "For every action there is an equal and opposite reaction"





http://www.aerospaceweb.org/question...s/q0015a.shtml

might help/ might not

[bongodriver]

Me personally no, I studied enough of that on my ATPL theory, so I am fully up to speed on all these effects.

[Wolf_Rider]

sorry, I meant "might help" for readers in general not directly for you... my bad


(I'd take a heavier flywheel, than stock, in my daily ride any day... they're so good for storing all that kinetic energy, eh)

[bongodriver]

Originally Posted by Wolf_Rider

sorry, I meant "might help" for readers in general not directly for you... my bad

Ah! OK......my bad too for assuming, I figured we were saying the same thing anyway.

[StreetGang]

So after 3 pages, what was the technique to reduce roll ? I do at the moment just trim the rudder, but then your craft is crabbing across the sky, surely this isn't what actually happened, I couldn't imagine BoB pilots being happy with crabbing.

[madrebel]

the italians solved this by extending the left wing of the macchi aircraft by 8.5". left wing created more lift and counter acted the roll.

[jimbop]

I trim elevator first, then rudder to remove crabbing, then manually hold against the roll with the stick.

[_RAAF_Mini]

I know for a fact that the Spitfire did have trim tabs on the airlerons for trimming but they could not be adjusted in flight. When the pilots lands he made his own corrections using a block of steel and a malet.

Small excesses of metal on the airlerons surface could be bent up or down to counter act any trim issues the pilot was having on his next flight, the problem would then hopefully be solved for his next hop.

Here is a video where a Spitfire is shipped form Duxford to the USA and it shows when they are doing the flight testing after it is rebuilt the pilot trimming it. Go to 40 minutes in. He trims it just after he lands. Sorry for any adverts on this video, it's a TV Channels on demand service.

http://www.youtube.com/watch?v=24eu9cQJ0cY

Cheers
Mini