Today's Message Index:
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1. 02:29 AM - Re: Re: 582 static rpm (Dave)
2. 02:08 PM - Re: Re: 582 static rpm (Patrick Reilly)
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| Subject: | Re: 582 static rpm |
Set your RPM for 6000 to 6200 static. on large props like 72" possibly
up to 6400
with stock pipe - this is a few HP loss due to shorter length - not a
big deal on a kitfox.
@ 5500 static is too low RPM you about 80% max power so about 50 to 55
HP
Cheers
----- Original Message -----
From: Patrick Reilly
To: kitfox-list@matronics.com
Sent: Thursday, May 29, 2014 4:25 PM
Subject: Re: Kitfox-List: Re: 582 static rpm
Mike, Thanks for the quick reply and info. I took the Kitfox out today
with 12 1/2 decrees of pitch on the Warp Drive prop. Same setting as
yesterday with 5500rpm static (plane tied down). All I could get on a
full throttle take off taxi was 4800rpm. Needless to say I didn't
takeoff. I'm frustrated now with these different results 2 days in a row
with identical prop setting. Plugs look good with rear plugs slightly
blacker than front cyl. Guess I'll do a compression check next. I think
it has to be carb related problem.
Pat Reilly
Mod 3 582 Rebuilt
Rockford, IL
On Thu, May 29, 2014 at 10:13 AM, mikeperkins <flybyewire@gmail.com>
wrote:
<flybyewire@gmail.com>
Hi Pat,
Jared and I talked the other day offline. I mentioned my 532 static
RPM was about 5800. But what I was shooting for was a Vx climb of 6600
RPM. When I finally got that, my static speed was 5800 RPM. But when I
had a new crankshaft installed, along with the necessary seals and
re-timed, I was getting only 4200 or so. The certified rebuilder's
recommendation was to reduce the pitch because I had a "new" engine. I
thought he was crazy because I was already convinced he'd screwed
something up. But in fact by taking some pitch off the prop, I got back
to about 6000 static. I'm also getting 6800 RPM on a Vx climb instead of
6600. So I probably need to add back in about 1/4 degree to get back
6600 again. But my overall performance numbers are close to what they
were before the rebuild, so I'm not worried that I lost horsepower when
it was rebuilt. Rather, the torque/RPM curve probably just moved
somewhat.
The one thing I've used as a rule is to not run my engine at high
power until the coolant temp stabilizes. I don't exceed 3000 RPM until
it does. The cylinder bores on the Rotax 2-strokes are round but the
pistons are cam-ground, eccentric by about .010". That compensates for
the cylinders' uneven expansion when everything heats up to operating
temp. But at lower temperatures, the piston/cylinder clearances are not
correct, and that often leads to scored pistons, which eventually leads
to cold seizures. Following that rule has been pretty good for my
engine; the pistons and cylinders are still looking good after 385
hours. I get the feeling that the big oil debate comes down to something
else - full warm-ups prior to full power, getting the prop load matched
to the engine, and watching the EGTs. (What I mean by matching the prop
load to the engine is to get max RPM at max throttle in a Vx or Vy
climb, your choice.)
It's still possible in my airplane to exceed the 1200 degree EGT
limit. I find that if I'm in a cruise descent with low power, say 30
percent, my EGTs soar. When I see that, I pull up to load the engine
again and add a little power. Nothing brings the EGTs down quicker than
that. It screws up my descent profile, but it helps the engine.
The max RPM for a 582 is listed as 6800 (for 5 minutes), whereas my
532 is 6600. So your numbers will be different than mine. But I think
the principles are the same.
Good seeing you here again, Pat. Hope things are well with you.
--------
Mike Perkins
Havana, Illinois
Model I, 532, B gearbox, GSC prop
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=423969#423969
==========
st" target="_blank">http://www.matronics.com/Navigator?Kitfox-List
==========
MS -
k">http://forums.matronics.com
==========
e -
-Matt Dralle, List Admin.
t="_blank">http://www.matronics.com/contribution
==========
--
Pat Reilly
Mod 3 582 Rebuild
Rockford,IL
Message 2
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| Subject: | Re: 582 static rpm |
Dave, Thanks for info. Great to hear from you. Wish this site was what it
was 5 years ago. I'd still be trying to build my plane without some of the
previous posters.
Pat Reilly
On Fri, May 30, 2014 at 4:28 AM, Dave <dave@cfisher.com> wrote:
> Set your RPM for 6000 to 6200 static. on large props like 72" possibly
> up to 6400
> with stock pipe - this is a few HP loss due to shorter length - not a big
> deal on a kitfox.
>
> @ 5500 static is too low RPM you about 80% max power so about 50 to 55 H
P
>
>
> Cheers
>
> ----- Original Message -----
>
> *From:* Patrick Reilly <patreilly43@gmail.com>
> *To:* kitfox-list@matronics.com
> *Sent:* Thursday, May 29, 2014 4:25 PM
> *Subject:* Re: Kitfox-List: Re: 582 static rpm
>
> Mike, Thanks for the quick reply and info. I took the Kitfox out today
> with 12 1/2 decrees of pitch on the Warp Drive prop. Same setting as
> yesterday with 5500rpm static (plane tied down). All I could get on a ful
l
> throttle take off taxi was 4800rpm. Needless to say I didn't takeoff. I'm
> frustrated now with these different results 2 days in a row with identica
l
> prop setting. Plugs look good with rear plugs slightly blacker than front
> cyl. Guess I'll do a compression check next. I think it has to be carb
> related problem.
>
> Pat Reilly
> Mod 3 582 Rebuilt
> Rockford, IL
>
>
> On Thu, May 29, 2014 at 10:13 AM, mikeperkins <flybyewire@gmail.com>
> wrote:
>
>>
>> Hi Pat,
>>
>> Jared and I talked the other day offline. I mentioned my 532 static RPM
>> was about 5800. But what I was shooting for was a Vx climb of 6600 RPM.
>> When I finally got that, my static speed was 5800 RPM. But when I had a
new
>> crankshaft installed, along with the necessary seals and re-timed, I was
>> getting only 4200 or so. The certified rebuilder's recommendation was to
>> reduce the pitch because I had a "new" engine. I thought he was crazy
>> because I was already convinced he'd screwed something up. But in fact b
y
>> taking some pitch off the prop, I got back to about 6000 static. I'm als
o
>> getting 6800 RPM on a Vx climb instead of 6600. So I probably need to ad
d
>> back in about 1/4 degree to get back 6600 again. But my overall performa
nce
>> numbers are close to what they were before the rebuild, so I'm not worri
ed
>> that I lost horsepower when it was rebuilt. Rather, the torque/RPM curve
>> probably just moved somewhat.
>>
>> The one thing I've used as a rule is to not run my engine at high power
>> until the coolant temp stabilizes. I don't exceed 3000 RPM until it does
.
>> The cylinder bores on the Rotax 2-strokes are round but the pistons are
>> cam-ground, eccentric by about .010". That compensates for the cylinders
'
>> uneven expansion when everything heats up to operating temp. But at lowe
r
>> temperatures, the piston/cylinder clearances are not correct, and that
>> often leads to scored pistons, which eventually leads to cold seizures.
>> Following that rule has been pretty good for my engine; the pistons and
>> cylinders are still looking good after 385 hours. I get the feeling that
>> the big oil debate comes down to something else - full warm-ups prior to
>> full power, getting the prop load matched to the engine, and watching th
e
>> EGTs. (What I mean by matching the prop load to the engine is to get max
>> RPM at max throttle in a Vx or Vy climb, your choice.)
>>
>> It's still possible in my airplane to exceed the 1200 degree EGT limit.
I
>> find that if I'm in a cruise descent with low power, say 30 percent, my
>> EGTs soar. When I see that, I pull up to load the engine again and add a
>> little power. Nothing brings the EGTs down quicker than that. It screws
up
>> my descent profile, but it helps the engine.
>>
>> The max RPM for a 582 is listed as 6800 (for 5 minutes), whereas my 532
>> is 6600. So your numbers will be different than mine. But I think the
>> principles are the same.
>>
>> Good seeing you here again, Pat. Hope things are well with you.
>>
>> --------
>> Mike Perkins
>> Havana, Illinois
>> Model I, 532, B gearbox, GSC prop
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=423969#423969
>>
>>
>>
>>
>>
>>
>>
>> ==========
>> st" target="_blank">http://www.matronics.com/Navigator?Kitfox-List
>> ==========
>> MS -
>> k">http://forums.matronics.com
>> ==========
>> e -
>> -Matt Dralle, List Admin.
>> t="_blank">http://www.matronics.com/contribution
>> ==========
>>
>>
>>
>>
>
>
> --
> Pat Reilly
> Mod 3 582 Rebuild
> Rockford,IL
>
> *
>
> href="http://www.matronics.com/Navigator?Kitfox-List <http://www.matron
ics.com/Navigator?Kitfox-List>">http://www.matronhref <http://www.matronhre
f>="http://forums.matronics.com <http://forums.matronics.com>">http://for
ums.matronics.com <http://forums.matronics.com>
> href="http://www.matronics.com/contribution <http://www.matronics.com/c
ontribution>">http://www.matronics.com/c <http://www.matronics.com/c>
> *
>
> *
>
===========
tronics.com/Navigator?Kitfox-List>
===========
===========
om/contribution>
===========
>
> *
>
>
--
Pat Reilly
Mod 3 582 Rebuild
Rockford,IL
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