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I think that what is referred to is that without a prop load, there is very little rotational inertia, and if you inadvertently (sp?) 'blip' the throttle, it may over rev before you can reduce the setting.
Sure, this can also happen is an automobile with the engine idling in neutral, you could press the accelerator and over-rev the engine. I don't know if the engine control module in an automobile contains some sort of 'overrev' protection programming or not, but I suspect it might. The EC-2 does not.
There is a report on Tracy's web site of someone destroying an engine when trying to start it without a prop load, and ending up with the throttle open more than desired when it fired up, ran to high rpm and blew apart the redrive drive plate.
Bill Schertz
KIS Cruiser # 4045
----- Original Message ----- From: <bbradburry@allvantage.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, October 25, 2005 7:44 AM
Subject: [FlyRotary] Re: Its a start!
Snip!
Running without a prop is a bit risky - overrev can happen suddenly.
Snip!
I don't understand how this is true...The engine has everything attached
that it has when it is installed in a car. It should run fine with just the
flywheel...adding the PSRU would be similar to turning the clutch and front
half of the tranny...????
Please explain.
Bill Bradburry
--
Homepage: http://www.flyrotary.com/
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