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  #1  
Old 04-27-2004, 08:38 AM
John Slade's Avatar
John Slade John Slade is offline
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Default Turbo Rotary N96PM takes to the air

I'm happy to announce that, after just over 5 years building, Cozy IV plans # 757 danced the skies this morning in a short but sucessful flight.

I've read others say that their first flight was "uneventful" and thought this to be a strange choice of words. Now I can appreciate the term because that's exactly what it was - uneventful.

Take off run was about 2000 ft on just over 1/2 throttle and wastegate fully open. Coolant temp was at about 185 in the climb, and 175 on the downwind. The engine purred smoothly, if a litle rich. (The fuel injection computer still needs some airborne tuning at various Manifold pressures.) The approach was a little fast but I managed to put her on the numbers at 75kts (thanks, Paul) and the touchdown was smooth. I used only a little braking to pull off at the end of the 3400 ft runway. I flew her once around the pattern - total time about 6 minutes. Ambient temp was 69F.

So now, the adventure begins...

John Slade

Cozy Mk IV Turbo Rotary N96PM
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  #2  
Old 04-28-2004, 01:17 PM
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Okay... the last thing I remember the turbo compressor broke off the spindle. (I wonder how many other engines would keep operating... maybe this is just a benign failure.) Anyway... don't keep us in suspense! What's the latest?!?!?
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  #3  
Old 04-28-2004, 01:59 PM
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Got the replacement (stock) turbo 20 minutes ago. Hope to be flying again in a day or so. Watch this space.
John
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  #4  
Old 04-28-2004, 02:43 PM
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Thumbs up Rock on John

Living through anothers experiences is inspiriational to say the least.
Lead on McDuff lead on....
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  #5  
Old 04-28-2004, 03:53 PM
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Quote:
Originally Posted by MarbleTurtle
I wonder how many other engines would keep operating... maybe this is just a benign failure.
As long as the engine doesn't ingest the wheel, just about any engine will keep running after this failure, but it will feel like a reduced throttle position as the wheel is now an obstruction.

Its just..weird...I've never heard of one just snapping like that for no reason. John I take it there was no heat darkening of the shaft?
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  #6  
Old 04-28-2004, 04:23 PM
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Quote:
I take it there was no heat darkening of the shaft?
Nope. No sign that the two were ever connected.

Quote:
Lead on McDuff lead on....
I once read a really good scifi book - forget the name, where the lead character was called "Hindmost" because he always hid behind the others. That's what I feel I'm doing. The real credit should go to Tracy Crook, Ed Anderson, George Graham, Greg Richter, Todd Bartrim, Rusty, Perry Mick, ..... I'm sure I've forgotten some important ones. These are the guys who really proved this can be made to work. I just stole a few ideas from each of them.

John Slade
"Hindmost"
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  #7  
Old 04-28-2004, 04:35 PM
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Maybe ring world and others by larry nevin, great books
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Enjoy the build,njut av byggandet, godere il costruire, nyd bygningen, geniesse den Bau, apolafse tin kataskevi, disfrute la construcción, curta a construção, Pidä hauskaa rakentamisen parissa, bouw lekker,uživaj grade?inaslajdaites postroikoi, geniet die bou
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maker of wood, fiberglass, foam dust, metal bits and one day a Cozy will pop out and swiftly whisk me from meeting old friends and family to adventures throughout the world
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  #8  
Old 04-28-2004, 04:46 PM
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Yea, thats the one - ringworld. But who has time to READ scfi these days - we're all too busy writing it.
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  #9  
Old 04-28-2004, 05:07 PM
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John;
Didnt a witness see a large amount of white smoke?
This means to me the oil seal failed. How much oil did you still have in the engine?
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  #10  
Old 04-30-2004, 05:15 PM
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Default Gotcha!

Quote:
Didnt a witness see a large amount of white smoke?
Not a large amount. A "puff" was what the one guy said. I lost 1 pint of oil & 1 pint of coolant.

Anyway - good news - I found the problem.

My oil feed line was routed under the alternator. There WAS plenty of clearance, but the alternator adjustment bolt can't have been tight enough. The belt pulled the alternator down onto the oil feed line and crimped it. New line - new routing - new turbo. Problem solved!
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  #11  
Old 04-30-2004, 06:54 PM
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It is great you got down to the root cause.
Are you going to increase the size of the feed tube anyway?
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  #12  
Old 04-30-2004, 08:22 PM
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Quote:
Are you going to increase the size of the feed tube anyway?
Absolutely. I went up to 1/4 ID. I just added a picture of the crimped hose on my website http://canardaviation.com/cozy/chap29.htm
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  #13  
Old 05-02-2004, 04:08 PM
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Default Flight # 4 report

I just posted a report decribing flight 4 to http://canardaviation.com/cozy/chap29.htm#flight4

This flight was "interesting" to put it mildly.
Enjoy!
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  #14  
Old 05-02-2004, 07:52 PM
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John - isn't there an ECU cross-over at around 2500 RPM? I'm assuming a RWS ECU.

From my manual it looks like that's about where the secondary injectors should kick in.

While it could be air intake, is this also a possibility? I don't know if you've tried switching to B, or if your MAP tables are setup in that computer also.

I don't know if you have a MAP guage - if so, for this type of fail should be indicated there as an obstruction to air-flow.

Just something to think about!

/dan
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  #15  
Old 05-02-2004, 07:59 PM
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Quote:
isn't there an ECU cross-over at around 2500 RPM? I'm assuming a RWS ECU.
Yes, I guess it's about there. I am running the EC2.

Quote:
While it could be air intake, is this also a possibility?
I really don't think so. The engine was running beautifully until the point where it cut back. When I got back I looked inside the cowl and saw that the pipe had come completely off the intercooler. 2 + 2 = 4.

Quote:
I don't know if you've tried switching to B, or if your MAP tables are setup in that computer also.
Nah. Not at 300 ft over a lake. I was too busy, and I had a running engine. I sure didnt want to make things worse.
At 5000ft I'd have tried a few things, but this was one of those "fly the airplane" times. Yes, the B computer is loaded with workable settings, and I do have a MAP gauge. Never even glanced at it
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