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Flight Test Progress

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JOHNTMEY(at)aol.com
Guest

Posted: Fri Feb 17, 2006 3:18 pm Post subject: Flight Test Progress

Listers,

 

N 5800 has about 15 hours now.  Test period is 25 hrs.  I've  played with Vso 

and top end etc.

 

I need some corelation on fuel capacity, unusable, and burn rate.

 

I think I have 52 gallons max (bigger HR tank skins) ?

 

2.5 gallons unusable each tank, eh ?

 

14.5 gph at 20"/2300 rpm giving 190 mph indicated at 3500'msl (ballpark  

speed confirmed by GPS)

 

I get some backfiring at random moments... and always when chopping for  

flare-out.

Whats that all about ?  Right now, it runs pretty warm, SoCal OATs  were 60 

to 80 F.

Mineral oil temp is around 200 +-10 and is sensitive to OAT.  All EGTs  line 

up and CHTs arent too bad.   No.1 runs cool on CHT.

 

When heat soaked on ground (and cruising) it shows signs of vapor effect,  

wiggles and lowering of fuel pressure... but it stabilizes with shot of electric 

 pump.

 

Anyone care to compare ?

 

John Meyers

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b.m.carr(at)telus.net
Guest

Posted: Fri Feb 17, 2006 6:14 pm Post subject: Flight Test Progress

John



I have a HR2 with large tanks and can add about 27 gal. to a tank when I 

blow it out. So I don't think you can have 2.5 gal. unusable.



I put heat risers on both front cylinders to keep cylinder temps. more 

uniform.



I also get popping when I pull the throttle back for landing.



Regards



Bryan Carr

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Jim Anglin

Joined: 10 Jan 2006
Posts: 47
Location: Independence, OR (7S5 Airpark)

Posted: Sat Feb 18, 2006 8:00 am Post subject: Flight Test Progress

I have been flying my HR II since May last year and would have to agree with your observations, with the exception of unusable fuel.  If you indeed have that much unusable I would have to question where you placed your fuel pickup - of course, it's too late to change it so......  Your speed and fuel burn are realistic although I think you burn a higher rate than mine but not much.  Mine also backfired when I reduced power but now I leave it quite lean and it doesn't do it.  At reduced power lean mixture won't hurt anything.  Just try leaning a little on each approach and see if it reduces backfiring.  Mine also pops a little on the ground when it is hot.   My fuel pressures don't remain steady, and never have on any of the airplanes I have owned - as long as it has pressure and the engine is happy, I'm happy.  Have Fun.

Jim Anglin

HR II N144HR

DO NOT ARCHIVE

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_________________
Jim Anglin
HR II N144HR

ehale(at)cheyenne-enviro.
Guest

Posted: Sun Feb 19, 2006 8:02 am Post subject: Flight Test Progress

I have a terrible time with fuel pressure due to vapor lock as well,  

any advice will be greatly appreciated, I have done just about  

everything I can think of.

On Feb 17, 2006, at 6:15 PM, JOHNTMEY(at)aol.com wrote:



 	  Quote: 	
		   



 Listers,



 N 5800 has about 15 hours now.  Test period is 25 hrs.  I've   

 played with Vso

 and top end etc.



 I need some corelation on fuel capacity, unusable, and burn rate.



 I think I have 52 gallons max (bigger HR tank skins) ?



 2.5 gallons unusable each tank, eh ?



 14.5 gph at 20"/2300 rpm giving 190 mph indicated at 3500'msl  

 (ballpark

 speed confirmed by GPS)



 I get some backfiring at random moments... and always when chopping  

 for

 flare-out.

 Whats that all about ?  Right now, it runs pretty warm, SoCal OATs   

 were 60

 to 80 F.

 Mineral oil temp is around 200 +-10 and is sensitive to OAT.  All  

 EGTs  line

 up and CHTs arent too bad.   No.1 runs cool on CHT.



 When heat soaked on ground (and cruising) it shows signs of vapor  

 effect,

 wiggles and lowering of fuel pressure... but it stabilizes with  

 shot of electric

  pump.



 Anyone care to compare ?



 John Meyers

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JOHNTMEY(at)aol.com
Guest

Posted: Mon Feb 20, 2006 3:39 am Post subject: Flight Test Progress

For e-hale, wondering what your symptoms are (vapor lock).  So far, I  have 

recovered mine from the hottest of starts and when I notice flicker of fuel  

pressure in flight, I give minute of boost pump and it soon  stablilizes.

 

Anyone.  When I shoot the fuel pump, the fuel flow instrument shows  some 

increase in fuel flow (cruise flight).  Where does that fuel go  ?  I don't think 

it goes thru the cylinders... there is  absolutely no change to the analyzer 

instrument. Eh ?

 

Continentals have a fuel return but not Lycomings.  I did buy the  Airflow 

mechanically-selected fuel-bypass-return valve... and I have used it for  hot 

starts, but I'm not sure it really does anything.

 

jtm   N5800

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