Mailing List flyrotary@lancaironline.net Message #38118
From: Ed Anderson <eanderson@carolina.rr.com>
Subject: Spinning Prop was [FlyRotary] Re: Chris' Engine Saga......
Date: Wed, 27 Jun 2007 11:47:22 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
No question that spinning prop is the most dangerous thing on the ground.  I do not find it pleasant to be standing within a couple of feet of a spinning prop myself. 
 
 I have a habit I have followed over the years, when the engine is running and I need to approach the engine compartment, I make certain my hip is against the leading edge of the wing as from the time I round the wingtip and start toward the engine.   I do not break contact until my front hits the fuselage, I then step one step sideways toward the nose and no further.  I also remind my self no arm waving until I reverse those steps and am past the wing tip once again. 
 
Once you get things squared away, there is seldom any need to approach the engine compartment with the engine running.
 
FWIW
 
Ed
 
 
----- Original Message -----
Sent: Wednesday, June 27, 2007 11:09 AM
Subject: [FlyRotary] Re: Chris' Engine Saga......

I understand what Chris is thinking. I dont want to get my motor setup dialed in with a prop spinnin' around me. Wonder if there would be another way to load the engine without a prop while tuning? maybe like a temporary generator or alternator under a hard load? Anybody got any ideas?

Bob Mears
Supermarine Spitfire


-----Original Message-----
From: thomas walter <roundrocktom@yahoo.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Wed, 27 Jun 2007 10:00 am
Subject: [FlyRotary] Re: Chris' Engine Saga......

Chris,
 
Trying to get the engine running, or setting parameters, without  a prop is just too darn frustrating!
 
With a heavy flywheel it will help absorp the rpm impulses to "smooth" things out. With the light weight automatic flexplate, rpm will bounce all over the place and confuse things.   With a heavy flywheel that "600 rpm" is really 580 to 620 rpm. With the flex plate, who knows!
 
I worked with the folks at Conti doing an early ISAD (integrated starter alternator dampener) function. Basically remove the flywheel and put in a large poly phase motor. Trick was on expansion stroke to absorb energy, on compression is would add energy. This was the dampening function.  Cool part was on the small diesel you turn ISAD off and 'rattle rattle rattle' was heard, flip the switch and engine was smooth as glass!   Huge difference in noise in the vehicle.  Pull up to a stop light and kill the engine. The red light in Germany has a sweep hand so you know "when to start your engine".  With the engine warmed up, push in the clutch and it was 0 to 700 rpm in 200mS.  :)
 
Best one... pulled up along a BMW. Our diesel Ford making a racket. Killed the engine at the red light. Light turned green and we 'jack rabbited' away as the 70kw diesel had a 50kw electric power added. BMW owner was going to get at the next light... repeated it. Really confused that poor BMW driver. :)
 
Tom
 
 

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