Mailing List flyrotary@lancaironline.net Message #21258
From: rijakits <rijakits@cwpanama.net>
Subject: Re: [FlyRotary] Re: Ed's new rotor housings
Date: Mon, 2 May 2005 07:30:20 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
 
----- Original Message -----
From: Al Gietzen
Sent: Monday, May 02, 2005 1:17 AM
Subject: [FlyRotary] Re: Ed's new rotor housings

 Group

I hate to stir the pot again, but using fuses instead of circuit brakers is asking for dead stick landings.

Georges B.

 

The fuse blew because of a wiring problem; Reset the breaker and it either won’t reset, or it will trip again.  How does that help?

 

Al

 

You just figured out you really have a wiring problem!  ....not just a surge, intermitent switch short, etc.
I understand the idea is to be able:
a) Reset - overheated, temp. shorted circuits
b) See/feel a tripped CB

 

Though I do wonder, why e.g. on our Robinson Helicopters everything has CBs,but the clutch actuation motor, which has a fuse.......

However, this probably is a safety-measure: You only need the clutch to engage the rotor system. Once engaged it will retension in flight 1-2 times, but can do without it (in case the fuse blows). However you can't ever get near "take-off" if the fuse blows during the initial engagement (or dis-engagement on shut-down). You HAVE to get out and investigate WHY the fuse blew. However there is a spare fuse holder to be able to change the blown one in the field. Sometimes the fuse seems to just "wear" out. Just put in a new one and it keeps working fine, so I really don't see the need for the fuse. A CB will also let me "change" the fuse (reset).

I believe everyone is smart enough to watch a system closer once it pops a CB. Reset - watch/observe - if it pops immediately again - you probably have a serious problem. Does it hold - probably a surge or temporary overheat - BUT I still will be observing for quit a while....

 

Thomas Jakits (CB's for me...)

 

 

 

 

 

 

 

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