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Flight Test Progress

 
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JOHNTMEY(at)aol.com
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PostPosted: Fri Feb 17, 2006 3:18 pm    Post subject: Flight Test Progress Reply with 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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b.m.carr(at)telus.net
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PostPosted: Fri Feb 17, 2006 6:14 pm    Post subject: Flight Test Progress Reply with quote

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)

PostPosted: Sat Feb 18, 2006 8:00 am    Post subject: Flight Test Progress Reply with quote

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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HR II N144HR
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ehale(at)cheyenne-enviro.
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PostPosted: Sun Feb 19, 2006 8:02 am    Post subject: Flight Test Progress Reply with quote

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
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PostPosted: Mon Feb 20, 2006 3:39 am    Post subject: Flight Test Progress Reply with quote

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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