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Safety Cable Attached to Engine

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jose_m_toro(at)yahoo.com
Guest

Posted: Tue Feb 20, 2007 11:59 am Post subject: Safety Cable Attached to Engine

Hi All:



Coud someone explain how the cable is attached to the engine and to the airframe? Could you provide pictures?



Thanks!



Jose



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d(at)cfisher.com
Guest

Posted: Tue Feb 20, 2007 12:10 pm Post subject: Safety Cable Attached to Engine

I just looked and cannot find a pic but next time I have cowl off I will get 

a pic.



Basically I drilled 2 holes in firewall and feed 1/8" cable  through the 

holes and fished it around I think 4 tubes aft of firewall and back out 

through  the second hole in hte firewall.

Then I made a loop on each end  of cable and crimped a nico pres on each 

one.

Each Cable end loop is attached to 2 existing studs on bottom of engine then 

a large flat washer and double nuts. I think they are metric  but about 

7/16" size approx.



I will add that I posted this a while ago and here it is ...............



Dave

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jose_m_toro(at)yahoo.com
Guest

Posted: Tue Feb 20, 2007 12:51 pm Post subject: Safety Cable Attached to Engine

Thanks Dave!



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Bob

Joined: 24 Oct 2006
Posts: 89
Location: Damascus, Maryland, USA

Posted: Sun Feb 25, 2007 6:52 am Post subject: Re: Safety Cable Attached to Engine

Sorry to be a bit late to the thread on this but was out of town on work.

In answer to the question about whether safety cables have ever saved a life, the answer is definitely.  The formula one racers turn high rpms on their O-200s and are required to have cables.  There've been some engines kept in the mount that demonstrate the idea has value.



As for how to install the cable, you can get somewhat creative, as Dave's post shows.  The idea is to simply keep the weight of the engine as close to it's original location as possible if the mount breaks.



Two thoughts with respect to props breaking.  If one blades leaves, the cg change may not be so radical, which is a good thing, but the whirling asymmetric load can pull the engine out of the mount or break the mount.  If one blade breaks, the instant change in prop loading can lead to separation of other blades. If all blades do separate, the engine is less likely to be thrown out of the mounts, but losing the prop weight on the nose instantaneously throws the cg aft, the tail goes down, and the pilot better be able to respond really fast if he's close to the ground.  With the light props on Kitfoxes, this will probably be just a fast pitch-up, but we had a Bonanza lose a prop (much heavier prop than GSC) on approach to Gaithersburg when the owner was trying to go-around after the prop ticked the runway. The airplane stalled at about 30-40 feet altitude, fatal to him and wife.



Second thought if you've lost a prop blade(s) is to make sure to do a really good disassembly and inspection of the mount, airframe behind it, all welds, a run-out inspection of the prop shaft, mounting of accessories (like the loose carb mentioned), and anything else that high side/pulse loads may have affected.  Seriously consider whether an engine tear-down is needed, as the rpms went astronomical for at least a short time when the prop wasn't there.  



From the forensic aspect, it would be good for the community to determine which blade went first, then why. This is an art that will cost money and is not something that can be done by photos in a chat group, or by non-specialists. 

Bob

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