[elky] Re: [non] Engines (was re: Fwd: Response to a car dealer)
- From: Jared Ryan <jryan@xxxxxxxxxxxx>
- To: elky@xxxxxxxxxxxxx
- Date: Tue, 2 Nov 2010 12:36:35 -0500
There is noticeable vibration in the aircraft. It's not alarming or anything,
but it's there. Like on a car, it's more noticeable at different engine
speeds. It's actually very smooth at 2000 or above (normal cruising speeds for
the engine).
There is NOTHING like yelling out the door "CLEAR PROP!", turning the mag key
to the "start" position, and seeing that prop start to spin.
On Nov 2, 2010, at 10:24 AM, Chris Lindh wrote:
> That is a gigantic 4 cylinder. I would think even though it is
> opposed you would get a fair amount of vibration.
>
> On Tue, Nov 2, 2010 at 11:20 AM, Jared Ryan <jryan@xxxxxxxxxxxx> wrote:
>> Speaking of Dodge, this is tangential, but I was just browsing yesterday,
>> being my curious self, and came upon the specifications for the Lycoming
>> engine used in the Cessna 172 I got to fly.
>>
>> Four-cylinder opposed air-cooled engine, not unlike a VW, but 5.9L
>> displacement. WOW. 160 HP. Not a powerful engine but strong torque. A
>> propellor is tough to spin (it is also the engine's flywheel).
>>
>> I understand now why the redline is at about 2500 RPM and you tend to cruise
>> at about 2200. I was thinking at the time, "That is really slow for having
>> four cylinders", but I didn't realize it had the same displacement as the
>> Cummins six-cylinder used in Dodge pickups.
>>
>> I also see why it has two spark plugs per cylinder. Redundancy, yes, but
>> the bore is over 5". You need two spark plugs to light the mixture
>> completely. If you run on only one magneto (so only one plug per cylinder
>> is firing), the engine slows down 200-300 RPM.
>>
>> Part of the pre-flight is to run up the engine to full throttle and switch
>> to only one magneto, then to the other, to check for a fouled spark plug.
>> We had one before our flight, and leaning out the mixture for a few moments
>> corrected it.
>>
>>
>> On Nov 2, 2010, at 10:07 AM, Chris Lindh wrote:
>>
>>> Congrats on paying off the Honda. We've got a ways to go... we're
>>> loving the Dodge.
>
>
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