Multi engine training.

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Colonel
Posts: 3450
Joined: Wed Apr 29, 2015 10:31 am

props forward .... I can tell I've got it right by the fact that there's virtually no change in the sound
Exactly!  That's because as the power is reduced, the governor
is backing the props back all the way to the fine pitch stops,
so that when the props are advanced, it doesn't make any
difference to the pitch of the props - they are ALREADY at
full fine pitch.

Practically speaking, as soon as the RPM falls, you can
advance the props - gently - without any zinging.

I do not know of a single instructor or FTU in Canada
that knows of or teaches this.  But that's the way a
professional operates the equipment.


Throttle handling might not seem to be that important
if you aren't paying the repair bills on a piston/prop, but
when it comes to learning to fly a jet, it's ALL about the
throttles!

Bad habits picked up flying piston aircraft are going to
make transitioning to a jet harder.  Good habits are
going to make the transition easier.

When I train people for their jet type ratings, I tell
them it's all about controlling the airspeed on final.

Ask the guy that crashed a T-33 800 feet short of
an 8000 foot runway at YHM about it.

You wouldn't believe the number of four-bars that
have run off the end of runway 07/25 at CYOW
because they insisted on coming in too fast and
wouldn't overshoot.

Anyone remember the time Air France tried to land
at Pearson in horrible wx (no overshoot or divert,
of course) and came in hot and landed long and
destroyed the A340 in the ravine and let the pax
out on the 400?  I am not making this up.  Nice
people driving down the highway stopped and
picked them up and drove them back to the terminal.

More than once, Porter pilots have scared the shit
out of themselves, landing fast and long at the
Island and using all (and I mean all) of the runway.

Control the airspeed on final - even (and especially!)
when the wx is shit. 

It is the hallmark of a professional and if there is
ONE THING you learn from all my rants here, make
it that  :D


Tailwind W10
Posts: 110
Joined: Fri May 22, 2015 5:39 pm

I once watched a Cardinal do circuits at ZVL.  On every take-off i heard the engine RPM surge till the prop pitch could catch up, and yes even to this extremely low time novice, the guy sounded like a putz.  I happened to be standing by a friend, a PWA guy from the DC-6 days.  About all he could do was shake his head.


To pick a nit: When the 4 cylinder Lycoming model number has a digit in the 4th position of the suffix, it has counterweights on the crankshaft.  EG: O-360-A1A no counterweights vs O-360-A1G6 has one 6th order and one 8th order counterweights on the front con-rod web.


Sorry for the thread drift.


Gerry
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Chuck Ellsworth

When you go to bigger and more complex engines slow smooth throttle movements becomes extremely important and counterweights especially in big radials are one of the main reasons.

Many instructors see nothing wrong wit a student punching the throttle in in one swift movement if you allow them to do this at the start of their training it becomes ingrained in their engine handling and very difficult to retrain them.

Quick throttle movement is one of the worst habits a pilot can get into.

Colonel
Posts: 3450
Joined: Wed Apr 29, 2015 10:31 am

When the 4 cylinder Lycoming model number has a digit in the 4th position of the suffix, it has counterweights on the crankshaft
Correct!  Most of the little parallel-valve 4 cyl Lycs
in trainers I have flown do not have counterweights
(and sometimes have yellow arcs on the tach). 

Counterweights seem more common on the bigger
angle-valve 4 cyl Lycs ... I used to fly a Mooney M20J
with an angle-valve IO-360A3B6D (horrible dual magneto).
Colonel
Posts: 3450
Joined: Wed Apr 29, 2015 10:31 am

Pop Quiz: (no answer from Chuck allowed  ;D

Why do you never use negative thrust on a
radial engine?  That is, why do you never
drive the engine with the prop, with the
throttle all the way back in descent?

You would be amazed at the number of
people who own radial-engine aircraft,
and don't know this!
Chuck Ellsworth

The lack of knowledge about these engines can be partially blamed on the fact that the era of radial engines is slowly fading into the past.

However that does not change the simple fact that slow smooth throttle and prop control levers movement not only extends engine and prop life it is a sign of an aviator instead of a throttle monkey.

I am back in the land of cold and rain once again....in Salem Oregon for tonight.

Hey Colonel if I tie a brick to my wrist and jack off will the brick act like a counter weight in a radial engine, I did not stay in school long enough to understand physics and thought you might help me out.

Thanks in advance.

Chuck E.
David MacRay
Posts: 1259
Joined: Wed Jun 03, 2015 3:00 pm

I don't know enough about radials but as an elementary guess, I think the way all the other rods are attached to the master rod could cause some nasty stress if you subject them to back pressure.
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