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full throttle ?????

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taffy8706(at)yahoo.com
Guest

Posted: Tue Apr 18, 2006 10:49 am Post subject: full throttle ?????

List,

  Full throttle in case of linkage failure ???  When building my 701, I had the very same thoughts about going "full throttle" with any linkage failure.  It sounded like a great idea to me.  I talked it over with a couple of friends, and they both said the same thing:   "What if you have a throttle failure on engine start, at a fly-in, crowed ramp conditions,  with all kinds of  people  and airplanes around".

  In a panic situation, the shut-down procedure might not get done as quickly as one might expect and a lot of folks and equipment could be severly damaged.

  I opted for a conventional set up,  make the throttle system as "murphy proof" as possible and check it on every preflight.  I feel the dangers of "full throttle, if linkage fails" outweigh the advantages.    (Of course it all depends on when the failure occurs,  In Michel's situation it would have paid off, but what if it had happened 15-20 minutes earlier ??-------my opimion only--- Fritz



		

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leogates(at)allvantage.co
Guest

Posted: Tue Apr 18, 2006 12:55 pm Post subject: full throttle ?????

List,

I am very happy with my Rotax 912 throttle hook-up.  I always start the 

engine with my feet on the breaks.  My HDS will creep (tires skid) at 

full throttle.  A runaway at start up is a simple "turn off the 

ignition".  My hand is already 2" away on the throttle.  I don't see a 

problem and I would MUCH more prefer full throttle failure than idle.



My 2 cents.

Do not archive.



Leo Gates

N601Z



Fritz Gurschick wrote:



 	  Quote: 	
		  



List,

  "What if you have a throttle failure on engine start, at a fly-in, crowed ramp conditions,  with all kinds of  people  and airplanes around".

  In a panic situation, the shut-down procedure might not get done as quickly as one might expect and a lot of folks and equipment could be severly damaged.

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jean-paul.roy4(at)tlb.sym
Guest

Posted: Tue Apr 18, 2006 5:51 pm Post subject: full throttle ?????

Has anyone heard of John Croke who also tought the full throttle failure set

up wasn't up to par.



On  one approach, he decided to overshoot an applied full throttle without

getting any engine response or partial response,,,,,,,,,,,, and crashed his

701 in  some trees.



He had removed the heavy spring Rotax or Bing install on the carbs and

replaced it with a weaker spring.



Just ask him what he thinks:

 feedback(at)HomebuiltHELP.com



Jean-Paul

do not archive

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steveadams

Joined: 10 Jan 2006
Posts: 191

Posted: Wed Apr 19, 2006 6:00 am Post subject: Re: full throttle ?????

I guess you all are talking primarily about the Rotax, but most carburated Lycomings also have a "safety spring" intregal to the carb throttle linkage which goes full throttle in the case of a broken cable. I don't know about FI engines. I think this just makes sense. I have never started an aircraft with anyone standing anywhere close to the front of my plane and always have brakes on when starting. Even with a little creep or sliding forward when mashing on the brakes and full throttle, you should still have plenty of time to figure out what is happening and shut down before doing any damage or hurting someone. Now, if you start up without your feet on the brakes or with someone standing 10 feet in front of your prop, there might be a problem even if there's nothing wrong with your throttle cable. I'll take an unexpected full throttle on the ground any day over the throttle going to idle in flight. Just my 2 cents worth.

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