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  #211  
Old 12-16-2018, 08:30 PM
Bill Boyd's Avatar
Bill Boyd Bill Boyd is offline
 
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Location: Landing field "12VA"
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I don't know, Larry - you start getting the ends of a water level too far apart and you'll need to consult a tide chart to see which end is being affected by lunar gravitation.
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Bill Boyd

Hop-Along Aerodrome (12VA)
RV-6A - N30YD - Built '98 / sold '20
RV-10 - N130YD - 50 hours +
65 years running stock DNA
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  #212  
Old 01-20-2019, 08:31 PM
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Bill Boyd Bill Boyd is offline
 
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This is what a Quincy compressor looks like when it's been hit with an ABC fire extinguisher because flames were shooting out of the motor's air vents

I was in the shop riveting tonight when the compressor cycled and started squealing and groaning. I took my hearing pro off and walked over to the compressor closet when I heard and saw a POP and foot-tall flames began issuing from all the vent grilles in the motor. I unplugged the 220V, ran upstairs and fetched a dry chemical extinguisher and let fly, probably unnecessarily since the flames were just a couple inches tall by then. Acrid smoke and monoammonium phosphate dust are a bad combo in a confined space.

The compressor turns freely by hand, as does the motor, and the belt was not burnished anywhere. The motor will be going to a rebuild shop, while I hope that the compressor is not the culprit. It's full of clean oil, and has never given a moment's trouble in the 38 months I've owned it.

I guess I will revert to fiberglass work while this happens. I was on chapter 42, getting ready to stab the wings and do control alignment. Sad...

At least the house didn't burn down this time! The starting caps look fine and the thermal reset switch never popped. Strange


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Bill Boyd

Hop-Along Aerodrome (12VA)
RV-6A - N30YD - Built '98 / sold '20
RV-10 - N130YD - 50 hours +
65 years running stock DNA
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  #213  
Old 01-20-2019, 09:45 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
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Quote:
Originally Posted by Bill Boyd View Post
This is what a Quincy compressor looks like when it's been hit with an ABC fire extinguisher because flames were shooting out of the motor's air vents

I was in the shop riveting tonight when the compressor cycled and started squealing and groaning. I took my hearing pro off and walked over to the compressor closet when I heard and saw a POP and foot-tall flames began issuing from all the vent grilles in the motor. I unplugged the 220V, ran upstairs and fetched a dry chemical extinguisher and let fly, probably unnecessarily since the flames were just a couple inches tall by then. Acrid smoke and monoammonium phosphate dust are a bad combo in a confined space.

The compressor turns freely by hand, as does the motor, and the belt was not burnished anywhere. The motor will be going to a rebuild shop, while I hope that the compressor is not the culprit. It's full of clean oil, and has never given a moment's trouble in the 38 months I've owned it.

I guess I will revert to fiberglass work while this happens. I was on chapter 42, getting ready to stab the wings and do control alignment. Sad...

At least the house didn't burn down this time! The starting caps look fine and the thermal reset switch never popped. Strange
No warranty? Sounds like the start winding. But . . . if the compressor moves easily, did the pressure release work? Belt squealing and compressor free seems contradictory.
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  #214  
Old 01-21-2019, 06:24 AM
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Bill Boyd Bill Boyd is offline
 
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The over-pressure valve didn't open, nor should it have. As far as I know this was a normal operating cycle initiated by my usage of enough air in the tank to call for a run cycle. It was the first such of the evening, so the compressor had probably not run in several hours.

I will get the motor to an overhaul shop this week. Should be repairable for less that the 750 that Quincy wants for a new one. Meanwhile I can shift to fiberglass work on the wheel pants as there's still some cosmetics to address.
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Bill Boyd

Hop-Along Aerodrome (12VA)
RV-6A - N30YD - Built '98 / sold '20
RV-10 - N130YD - 50 hours +
65 years running stock DNA
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  #215  
Old 01-21-2019, 07:39 AM
BillL BillL is offline
 
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Location: Central IL
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Bill, that motor does not have enough torque at start to overcome back pressure of the tank, so there is a pressure relief so the first couple of revs of the compressor is pumping against a low pressure. It is typically a valve triggered by the pressure regulator to relieve the pressure from the compressor to the tank.

I think the only reason the motor is $750 is because of the direction of the motor rotation, and it is not reversible with normal means. My compressor motor was the same 5 hp on an IR and exactly motors like it turning the opposite direction are only in the $300 range IIRC. Ain't marketing and market access wonderful.

I bought a fully enclosed 7.5HP motor that was reversible, added a fuse for the windings (that size has more protection) a new pulley taper insert and happy days. The compressor (torque) sets the amperage demand, so it actually drew fewer amps than the old motor since it was a little more efficient.

I did not know the motor could be rebuilt, but I did find that the so-called non-reversible motor turning the wrong direction can be reversed at the winding bundle. It might be cheaper at the shop to get a new motor and modify it's rotation.

Please post your findings on the rebuild, I have a core handy.

edit: One last comment - the start winding has a smaller wire diameter than the run winding. The thermal switch is only for the run winding in this model.
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  #216  
Old 01-21-2019, 08:08 AM
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Bill Boyd Bill Boyd is offline
 
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Location: Landing field "12VA"
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Default Interesting. Thanks for the info!

IIRC, in looking over the motor last night there were instructions on the label for selecting direction of rotation based on some externally accessible connections.

Based on your info, I wonder if I suffered a failure of a pressure unloader valve in the control switch. Maybe that's a remove and replace just to be safe item after I sink $$$ in the motor rebuild.
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Bill Boyd

Hop-Along Aerodrome (12VA)
RV-6A - N30YD - Built '98 / sold '20
RV-10 - N130YD - 50 hours +
65 years running stock DNA

Last edited by Bill Boyd : 01-21-2019 at 08:12 AM.
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  #217  
Old 01-23-2019, 12:32 PM
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Bill Boyd Bill Boyd is offline
 
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Location: Landing field "12VA"
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A great psychological barrier has been crossed in this build: not only is she on her gear now, but this happened last night. Very visible progress, probably the most there will ever be at one swoop.

Thanks to my son and my daughter's boyfriend for manhandling the expensive and delicate pieces without a mishap.







I should probably write "WASH ME!" in the dust before some wiseacre beats me to it.
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Bill Boyd

Hop-Along Aerodrome (12VA)
RV-6A - N30YD - Built '98 / sold '20
RV-10 - N130YD - 50 hours +
65 years running stock DNA

Last edited by Bill Boyd : 01-23-2019 at 12:35 PM.
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  #218  
Old 01-23-2019, 01:00 PM
Bill Boyd's Avatar
Bill Boyd Bill Boyd is offline
 
Join Date: Sep 2006
Location: Landing field "12VA"
Posts: 1,706
Default Mystery

Taking the wings out of the cradle and seeing the previous builder's protective tape over the gas caps reminded me that I have not uncovered anything resembling a gas cap key in my many rummages through the kit bits.

I wonder if Andair uses more than one key pattern for their locking caps, and if they'd have a record of a purchase from a decade ago. I see no serial number of any kind on the caps themselves.

I guess I need to ask them. If the keys had made it to my shop, they'd have surfaced in the last 3 years.

Locked out of my own gas tanks
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Bill Boyd

Hop-Along Aerodrome (12VA)
RV-6A - N30YD - Built '98 / sold '20
RV-10 - N130YD - 50 hours +
65 years running stock DNA
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  #219  
Old 01-24-2019, 06:39 AM
daddyman's Avatar
daddyman daddyman is offline
 
Join Date: Jan 2014
Location: Fredericksburg, Virginia
Posts: 326
Default What, it doesn't look like a canoe any longer!

Quote:
Originally Posted by Bill Boyd View Post
A great psychological barrier has been crossed in this build: not only is she on her gear now, but this happened last night. Very visible progress, probably the most there will ever be at one swoop.

Thanks to my son and my daughter's boyfriend for manhandling the expensive and delicate pieces without a mishap.







I should probably write "WASH ME!" in the dust before some wiseacre beats me to it.
Bill,
Way to go.
Those guys are handy to have around.
Daddyman
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  #220  
Old 01-24-2019, 01:45 PM
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Bob Martin Bob Martin is offline
 
Join Date: Jan 2005
Location: Charlottesville, Virginia
Posts: 1,277
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Bill,
Looking good.......
Nice to have a basement shop that can handle a RV-10!
Congrats on making it that far.
Bob
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RV-6, 0-360 Hartzell C/S, Tip up, 1200+TT
James extended cowl/plenum, induction, -8VS and Rudder. TSFlightline hoses. Oregon Aero leather seats.
D100-KMD150-660-TT ADI2- AS air/oil seperator. Vetterman exhaust with turndown tips.
Louisa, Virginia KLKU N94TB
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