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Hot Starting Rocket

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JOHNTMEY(at)aol.com
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Posted: Mon Oct 01, 2007 9:39 am Post subject: Hot Starting Rocket

Current thread reminds me of question of hot starting the IO-540.   (cold start never a problem)

  

 Every now and then, mine gets cranky.  Won't start hot.  I have  an Airflow recirculating valve which seems to complicate the matter.  After  pumping, I can't tell if I'm wet or dry.  Guess I don't know how to use  it.

  

 My best bet is to open the oil door after parking... then later re-start  with no recirculation, no prime, mix cut-off, throttle 1/2 open.  It  usually pops right off while enrichening mixture, then  will smooth-out with a short burst of electric pump.  Requires  lots of hand movements 

  

 Any other hints ? 

  

 JohnM   N5800



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CalBru(at)aol.com
Guest

Posted: Mon Oct 01, 2007 10:04 am Post subject: Hot Starting Rocket

My hot start procedure from my checklist, as provided by Ron Carter:

  

 HOT  START 

Mixture  Closed 

Throttle  Closed 

Fuel  Pump    run it until you hear it load up 

Starter            run  starter --BTW, my starter switch is on my stick so I can hold it  back Mixture  to 1 inch Upon firing, full rich, throttle     slowly  move the mixture forward no more than one inch( while running the starter)   When if fires, push it full forward and add some throttle  Keep the stick  full back during all this

  

 This  has always worked for me, and I appreciate Ron's telling me how to do  it.    Before I learned this, I jump started two times.   Once at my hangar--no big deal, but once at a small airport duing the test  hours.  His rust bucket Nissan PU was parked between my wing and  tail!  You can bet I kept my feet firmly on the brakes during that  episode.

  

 Cal  B.

  

 F1    116      125 hours



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cjensen(at)dts9000.com
Guest

Posted: Mon Oct 01, 2007 10:45 am Post subject: Hot Starting Rocket

I concur with the start procedure suggested  by Cal but I modify it by, after flooding the hot engine,  by cutting the mixture to full off.  The engine will always catch as  you spin the engine with the starter.  As it passes from  the flooded condition toward lean cutoff, the fuel mixture, at some  point, it will be perfect.  When the engine catches, there will be enough  momentum in the engine that pushing the mixture full rich will allow the  engine to continue to run.  This techniques saves having to carry a ruler  to measure the 1" of mixture movement. 

  

 Chuck Jensen 

 [quote]   

[Chuck    Jensen]  --

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nico(at)cybersuperstore.c
Guest

Posted: Mon Oct 01, 2007 2:16 pm Post subject: Hot Starting Rocket

That sounds like how Continental would start, except that the mix is full rich and the throttle is advanced slowly. I believe that the Contis have a boost pump on the throttle, not sure about that at all. But the Lycs are a different beast altogether.   

My theory behind intentional flooding is that I get to start from a known point in the procedure. Most failed starts I had before adopting this procedure were because I didn’t know whether it was flooded or starved and cranked the battery dead before I could figure out what to do. Since I cannot intentionally starve the cylinders of fuel, I went the other direction. Fuel pumps on until fuel spills out the overflow line, fuel cutoff, full throttle and crank until it fires (burst of power) and then lots of hand movement to keep it running. Works every time, even the 380HP geared motor in the Commander 680.  

   

Nico  

   

         

  

From: owner-rocket-list-server(at)matronics.com [mailto:owner-rocket-list-server(at)matronics.com] On Behalf Of JOHNTMEY(at)aol.com

 Sent: Monday, October 01, 2007 10:37 AM

 To: rocket-list(at)matronics.com

 Subject: Hot Starting Rocket  

  

     

Current thread reminds me of question of hot starting the IO-540.  (cold start never a problem)  

    

   

    

Every now and then, mine gets cranky.  Won't start hot.  I have an Airflow recirculating valve which seems to complicate the matter.  After pumping, I can't tell if I'm wet or dry.  Guess I don't know how to use it.  

    

   

    

My best bet is to open the oil door after parking... then later re-start with no recirculation, no prime, mix cut-off, throttle 1/2 open.  It usually pops right off while enrichening mixture, then will smooth-out with a short burst of electric pump.  Requires lots of hand movements   

    

   

    

Any other hints ?   

    

   

    

JohnM   N5800  

  



 

         

  

Make AOL Your Homepage.  

  

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href="http://www.matronics.com/Navigator?Rocket-List">http://www.matronhref="http://forums.matronics.com">http://forums.matronics.com



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jrstone(at)insightbb.com
Guest

Posted: Mon Oct 01, 2007 5:54 pm Post subject: Hot Starting Rocket

I can't believe the heat that comes out the dipstick door when pointed into  the wind.  That really helps after a failed attempt.

 Thanks,

 Jim Stone

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jrstone(at)insightbb.com
Guest

Posted: Mon Oct 01, 2007 5:57 pm Post subject: Hot Starting Rocket

I'll give that a try.

 Thanks,

 Jim Stone

  

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jrstone(at)insightbb.com
Guest

Posted: Mon Oct 01, 2007 6:05 pm Post subject: Hot Starting Rocket

Thanks Chuck,

 Jim Stone

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