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  #1  
Old 08-27-2017, 09:17 PM
airguy's Avatar
airguy airguy is offline
 
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 3,856
Default Rejected takeoff

I got my airplane out of the paint shop today (finally!) and I had pulled my fuel divider off the engine to do some work on the Airflow Performance purge valve while it was down for paint. I reinstalled it yesterday while the painter was doing final touchup, and today pulled the airplane over to the fuel farm and fueled it up. I then flushed the lines quite well (or what I thought was quite well, anyway) and replaced the supply line to the purge valve, flushed it again back to the tank return, then flushed the divider without the spider lines on it, then with the spider lines on the divider but not the injectors, and then finally attached the spider lines to the injector.

Satisfied with all that, I put the plenum and cowl on and decided to fly my bird home (yes, a good mechanical QC of all flight surfaces happened already). I cranked up and did a good warmup and runup right there at the paint shop, no anomalies. Taxied out to the runway, repeated the good runup with no anomalies. Took the runway and opened up full power, and just as the nosewheel is breaking ground the engine goes to ****. RPM dropped down to around 1500-ish, power was almost nothing, and it was vibrating pretty strongly. I instinctively pulled power, let the nose settle down and with light braking made the mid-field turnoff. Taxied back and the engine was obviously sick - still running but barely, smoking, #2 temps were dropping fast and it obviously wasn't firing. Suspecting a plugged injector I pulled the mixture way lean and the engine cleaned up nicely - but was still shaking, and #2 was still dead. Shut down, decowled, pulled #2 injector orifice, and sure enough there was something small lodged in there. Blew it out with air, flushed everything again, and did a couple full-power runups at high fuel flow to make sure - and then flew home uneventfully.

Not sure what I could have done differently - my eyes are pretty good and I had trouble seeing whatever it was in the injector - obviously my line flushing failed to dislodge whatever it was until the fuel flow got up into the 15+ gpm range and then it was just a question of which injector orifice it would hit. Once it did, that cylinder went dead lean and the other three went hyper-rich. I was spring-loaded for a problem after taking it out of paint - but I was expecting a flight control issue or trim issue, not an engine problem.

Live and learn.

On the plus side - the new paint looks great! As soon as I can figure out a new photo sharing setup, I'll share some of the pics.
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Greg Niehues - VAF 2017 dues paid
Garden City, TX
N16GN flying! http://websites.expercraft.com/airguy/
Built an off-plan 9A with too much fuel and too much HP. Should drop dead any minute now.
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  #2  
Old 08-28-2017, 06:18 AM
vic syracuse vic syracuse is offline
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Default

Well done.

Vic
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Vic Syracuse

Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
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  #3  
Old 08-28-2017, 08:41 AM
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DanH DanH is offline
 
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Location: 08A
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Default

Quote:
Shut down, decowled, pulled #2 injector orifice, and sure enough there was something small lodged in there.
A lighted 10x magnifier may not have helped with the actual problem (can't see something which has not yet flushed its way into the restrictor), but it does allow inspecting the bore of carb jets and FI restrictors in great detail after cleaning.

Great for all kinds of things ("Is that a crack or a scratch?"). Put one in your toolbox. Trust me, you'll be amazed at what you've been missing.

Bausch and Lomb's 10x is probably the most common. Mine is 20 or 25 years old. B&L really needs to upgrade it with an LED light. It's relatively expensive, but the optics are excellent:

http://www.bausch.com/our-products/v...ted-coddington

Recently added one of these to an order. Turned out to be surprisingly good all around. The head is large compared to the B&L, so it's not going into tight corners when doing airframe inspections, but it's great for the price.

https://www.tomtop.com/magnifier-204/p-h9152.html

There are others.
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  #4  
Old 08-28-2017, 10:17 PM
Derek.Hardie Derek.Hardie is offline
 
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Location: Australia
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Default This is what I found

http://www.vansairforce.com/communit...ferrerid=24074
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  #5  
Old 08-28-2017, 10:21 PM
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Don Jones Don Jones is offline
 
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Location: Las Cruces, New Mexico
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So......where are the paint pictures??? Good job on the abort!
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  #6  
Old 08-29-2017, 10:14 AM
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airguy airguy is offline
 
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Location: Garden City, Tx
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Quote:
Originally Posted by Don Jones View Post
So......where are the paint pictures??? Good job on the abort!
I gotta find a new photohosting method! What are you guys using now that Photobucket went all capitalistic on us?

Quote:
Originally Posted by DanH View Post
A lighted 10x magnifier may not have helped with the actual problem (can't see something which has not yet flushed its way into the restrictor), but it does allow inspecting the bore of carb jets and FI restrictors in great detail after cleaning.
Excellent point Dan - I'll pick one up for the in-flight toolkit.
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Greg Niehues - VAF 2017 dues paid
Garden City, TX
N16GN flying! http://websites.expercraft.com/airguy/
Built an off-plan 9A with too much fuel and too much HP. Should drop dead any minute now.
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