Today's Message Index:
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1. 12:46 AM - Ram Air Boost? (jchang10)
2. 07:21 AM - Re: Ram Air Boost? (Bill Watson)
3. 08:10 AM - Re: Ram Air Boost? (Don McDonald)
4. 10:11 AM - Re: Ram Air Boost? (rv10flyer)
5. 12:14 PM - wheels and brakes (DLM)
6. 12:59 PM - Re: wheels and brakes (Tim Olson)
7. 01:15 PM - Garmin 300XL NAV/COM (John Dunne)
8. 03:21 PM - Re: Garmin 300XL NAV/COM (Rob Kermanj)
9. 04:59 PM - Re: Garmin 300XL NAV/COM (Roxanne and Mike Lefever)
10. 05:30 PM - Re: Garmin 300XL NAV/COM (Bill Watson)
Message 1
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Just out of curiosity, has anyone else noticed getting any kind of ram air boost
in MAP? I am stock plans, engine, etc.
Specifically, i notice a little boost when pitching over to start a descent from
cruise. I noticed this a few times now where I am cruising along at 22" x 2200
rpm or so at 3,000ft and 145 to 150 KIAS. Shortly after pitching over a bit
and having only lost 500ft of altitude but now showing 160 KIAS, i will notice
i am running oversquared at 24" x 2200 rpm for instance. How did i gain 2 inches
all of a sudden?
I wonder if the MAP reading is accurate? The plane doesn't know it's pitched down
per se, so is there something special about 160 KIAS? Sanity check?
Jae
--------
#40533 RV-10
First flight 10/19/2011
Phase 1 Done 11/26/2011
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=366580#366580
Message 2
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| Subject: | Re: Ram Air Boost? |
I know nothing about ram air, MAP, etc, but intuition has me believing
that this is as it should be. That we do have a ram air inlet, that a
forward facing inlet gives us a positive boost in MAP at all speeds, and
that if all things are equal, a 10 knot increase in speed would result
in some increase in MAP. The pitch angle is not really involved, it's
just speed.
But I don't have a clue....
"Curious" Bill
> --> RV10-List message posted by: "jchang10"<jc-matronics_rv10@jline.com>
>
> Just out of curiosity, has anyone else noticed getting any kind of ram air boost
in MAP? I am stock plans, engine, etc.
>
> Specifically, i notice a little boost when pitching over to start a descent from
cruise. I noticed this a few times now where I am cruising along at 22" x
2200 rpm or so at 3,000ft and 145 to 150 KIAS. Shortly after pitching over a bit
and having only lost 500ft of altitude but now showing 160 KIAS, i will notice
i am running oversquared at 24" x 2200 rpm for instance. How did i gain 2
inches all of a sudden?
>
> I wonder if the MAP reading is accurate? The plane doesn't know it's pitched
down per se, so is there something special about 160 KIAS? Sanity check?
>
> Jae
>
>
Message 3
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| Subject: | Re: Ram Air Boost? |
I think if you monitored the MP closely/continuously, you would see that pa
rt of the increase is due to altitude change, and part is due to increased
airspeed.- I continually reduce my MP on decent,,, usually maintaining so
mewhere between 18 and 19".=0ADon=0A =0A=0A________________________________
=0A From: jchang10 <jc-matronics_rv10@jline.com>=0ATo: rv10-list@matronics.
com =0ASent: Sunday, February 19, 2012 2:45 AM=0ASubject: RV10-List: Ram Ai
v10@jline.com>=0A=0AJust out of curiosity, has anyone else noticed getting
any kind of ram air boost in MAP? I am stock plans, engine, etc.=0A=0ASpeci
fically, i notice a little boost when pitching over to start a descent from
cruise. I noticed this a few times now where I am cruising along at 22" x
2200 rpm or so at 3,000ft and 145 to 150 KIAS. Shortly after pitching over
a bit and having only lost 500ft of altitude but now showing 160 KIAS, i wi
ll notice i am running oversquared at 24" x 2200 rpm for instance. How did
i gain 2 inches all of a sudden?=0A=0AI wonder if the MAP reading is accura
te? The plane doesn't know it's pitched down per se, so is there something
special about 160 KIAS? Sanity check?=0A=0AJae=0A=0A--------=0A#40533 RV-10
=0AFirst flight 10/19/2011=0APhase 1 Done 11/26/2011=0A=0A=0A=0A=0ARead thi
s topic online here:=0A=0Ahttp://forums.matronics.com/viewtopic.php?p=366
========================
Message 4
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| Subject: | Re: Ram Air Boost? |
I'll have to check that out next time we go up.
The decrease in angle of attack exposes a slightly larger engine air inlet area.
Then you have the airspeed increase, altitude decrease, propeller pitch increase
that will also raise MP.
When I begin descent I slowly pull power back to maintain cruise airspeed and leave
mixture alone until I get down close to pattern altitude.
--------
Wayne Gillispie, A&P 05/93 PP 10/08
40983SB 12/1/2009-12/1/2011
N715WD 382nd Flying. TT= 31 hrs.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=366620#366620
Message 5
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| Subject: | wheels and brakes |
This is uneconomic for flying aircraft but I believe MATCO also makes a
comparable wheel/brake to replace the Cleveland mains. Considering the cost
of the brake linings of either RAPCO or Cleveland 066-11200, perhaps Matco
alternate wheels/brakes for the mains ought to be considered before ordering
the Cleveland's from Vans. New builders will need to exchange the Matco nose
wheel with Matco directly to get the correct one that provides adequate
valve stem clearance and also the appropriate axle for the 10 nose wheel.
Message 6
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| Subject: | Re: wheels and brakes |
On the other hand, if you're stuck somewhere on the ground in need of parts,
it may be easier to get parts for something that is stocked in many shops, o
r available from multiple sources. And in the case of brake pads, they're n
ow made by two separate companies which is nice in these uncertain times. I
like the stuff Matco sells, but I want to know that in 15 years I can still
get parts. No argument, just showing another side of the coin.
Tim
On Feb 19, 2012, at 2:12 PM, "DLM" <dlm34077@q.com> wrote:
> This is uneconomic for flying aircraft but I believe MATCO also makes a co
mparable wheel/brake to replace the Cleveland mains. Considering the cost of
the brake linings of either RAPCO or Cleveland 066-11200, perhaps Matco alt
ernate wheels/brakes for the mains ought to be considered before ordering th
e Cleveland=99s from Vans. New builders will need to exchange the Matc
o nose wheel with Matco directly to get the correct one that provides adequa
te valve stem clearance and also the appropriate axle for the 10 nose wheel.
>
>
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Message 7
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| Subject: | Garmin 300XL NAV/COM |
Looking for some suggestions from anyone who may recognise this problem.
Yesterday after making a missed GPS approach, I noticed the 300XL screen
starting to go blank.
Couldn't read anything worthwhile.
Turned the unit off for a few minutes or so and then powered up
again...very faint but readable.
The unit was still working but I couldn't see enough to change frequencies
etc...
Back home and in the hangar unit worked fine.
Is this a heat issue or something else? hasn't happened before and
yesterday wasn't the hottest it has operated in.
Garmin info says not compulsory to have ducted cooling to the unit but a
very good idea.
I don't have a cooling fan behind the avionics stack.
ambient temps were in the low 90F's.
Does anyone recognise the symptoms here?
John 40315
*
*
Message 8
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| Subject: | Re: Garmin 300XL NAV/COM |
My old VW Passat has the same issue with its digital display. Left in the su
n, the display fades out but once the a/c cools the car, it comes alive. It s
tarted happening with age.
Do not archive.
Rob Kermanj
Sent from my iPad
On Feb 19, 2012, at 4:14 PM, John Dunne <acs@acspropeller.com.au> wrote:
> Looking for some suggestions from anyone who may recognise this problem.
> Yesterday after making a missed GPS approach, I noticed the 300XL screen s
tarting to go blank.
> Couldn't read anything worthwhile.
> Turned the unit off for a few minutes or so and then powered up again...ve
ry faint but readable.
> The unit was still working but I couldn't see enough to change frequencies
etc...
> Back home and in the hangar unit worked fine.
> Is this a heat issue or something else? hasn't happened before and yesterd
ay wasn't the hottest it has operated in.
> Garmin info says not compulsory to have ducted cooling to the unit but a v
ery good idea.
> I don't have a cooling fan behind the avionics stack.
> ambient temps were in the low 90F's.
> Does anyone recognise the symptoms here?
>
> John 40315
>
>
>
>
>
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Message 9
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| Subject: | Garmin 300XL NAV/COM |
I had a 300XL in my Cessna here in Arizona for 5 years and it sat outside 3
of those years I never had any problems due to heat.
Date: Mon=2C 20 Feb 2012 07:14:20 +1000
Subject: RV10-List: Garmin 300XL NAV/COM
From: acs@acspropeller.com.au
Looking for some suggestions from anyone who may recognise this problem.
Yesterday after making a missed GPS approach=2C I noticed the 300XL screen
starting to go blank.Couldn't read anything worthwhile.
Turned the unit off for a few minutes or so and then powered up again...ver
y faint but readable.
The unit was still working but I couldn't see enough to change frequencies
etc...Back home and in the hangar unit worked fine.
Is this a heat issue or something else? hasn't happened before and yesterda
y wasn't the hottest it has operated in.
Garmin info says not compulsory to have ducted cooling to the unit but a ve
ry good idea.I don't have a cooling fan behind the avionics stack.
ambient temps were in the low 90F's.
Does anyone recognise the symptoms here?
John 40315
Message 10
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| Subject: | Re: Garmin 300XL NAV/COM |
The unit I had my Maule was dim and slow when very cold... Doesnt apply to y
ou.
I also had some water that would get into the stack and that caused the unit
to not come on at first.. And then start up dim. This only happened when p
arked outside overnight AND if there had been rain or heavy condensate. I'd
roll the plane into the sun and wait 30 mins. Then power up and go.
Bill
Sent from my iPad
On Feb 19, 2012, at 4:14 PM, John Dunne <acs@acspropeller.com.au> wrote:
> Looking for some suggestions from anyone who may recognise this problem.
> Yesterday after making a missed GPS approach, I noticed the 300XL screen s
tarting to go blank.
> Couldn't read anything worthwhile.
> Turned the unit off for a few minutes or so and then powered up again...ve
ry faint but readable.
> The unit was still working but I couldn't see enough to change frequencies
etc...
> Back home and in the hangar unit worked fine.
> Is this a heat issue or something else? hasn't happened before and yesterd
ay wasn't the hottest it has operated in.
> Garmin info says not compulsory to have ducted cooling to the unit but a v
ery good idea.
> I don't have a cooling fan behind the avionics stack.
> ambient temps were in the low 90F's.
> Does anyone recognise the symptoms here?
>
> John 40315
>
>
>
>
>
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