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EMAproducts(at)aol.com
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 Posted: Sat Jan 01, 2011 9:59 pm Post subject: Alternate Air |
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Alternate Air intake
I'm sure some of you have flown the Mooney with the "Ram Air" door in the nose, pulled open gained about 2" MP (at) cruise, look at most injected production planes, sucker doors in the inlet somewhere in case filter gets plugged. All sorts of ideas that work excellent. Personally over 25000 hours, still instructing my comment if your air filter freezes over that is the least of your problems, if I recall you can't legally fly in icing conditions anyway, and your wings will shortly lose lift to support you. Be safe live a long life,
Elbie Mendenhall EAA 38308
[quote][b]
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Sun Jan 02, 2011 1:34 pm Post subject: Alternate Air |
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The Mooney Ram Air is in NO way an alternate air. In fact it is prohibited from use in precipitation. There is a separate alternate air door that is spring loaded, automatic operation whenever intake suction overcomes the spring.
On Sat, Jan 1, 2011 at 10:56 PM, <EMAproducts(at)aol.com (EMAproducts(at)aol.com)> wrote:
| Quote: | Alternate Air intake
I'm sure some of you have flown the Mooney with the "Ram Air" door in the nose, pulled open gained about 2" MP (at) cruise, look at most injected production planes, sucker doors in the inlet somewhere in case filter gets plugged. All sorts of ideas that work excellent. Personally over 25000 hours, still instructing my comment if your air filter freezes over that is the least of your problems, if I recall you can't legally fly in icing conditions anyway, and your wings will shortly lose lift to support you. Be safe live a long life,
Elbie Mendenhall EAA 38308
| Quote: |
get="_blank">http://www.matronics.com/Navigator?RV10-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
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#avg_ls_inline_popup{position: absolute;z-index: 9999;padding: 0px 0px;margin-left: 0px;margin-top: 0px;overflow: hidden;word-wrap: break-word;color: black;font-size: 10px;text-align: left;line-height: 130%;} [quote][b]
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Kelly McMullen
A&P/IA, EAA Tech Counselor
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pitts_pilot(at)bellsouth.
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| Posted: Sun Jan 02, 2011 2:15 pm Post subject: Alternate Air |
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I'm no expert, but I believe almost all the intake filters on certified aircraft are either a foam or folded filter element that is easily blocked by snow/freezing rain, bird feathers, or just plain dirt, and may be easily have a problem if there wasn't some alternate air source or carb heat.
The ring type of filter we use is far more forgiving of stuff entering the intake and clogging the filter. I just don't see how the whole FAB would fill with enough stuff to cause a problem. With this thread, I have yet to hear from anybody that's had any type of intake malfunction ...... due to clogging ..... unless I just plain missed it.
So, are there any flying -10s out there that have actually had a problem???
Linn
On 1/2/2011 4:26 PM, Kelly McMullen wrote: [quote]The Mooney Ram Air is in NO way an alternate air. In fact it is prohibited from use in precipitation. There is a separate alternate air door that is spring loaded, automatic operation whenever intake suction overcomes the spring.
On Sat, Jan 1, 2011 at 10:56 PM, <EMAproducts(at)aol.com (EMAproducts(at)aol.com)> wrote:
| Quote: | RV10-List: Alternate Air intake
I'm sure some of you have flown the Mooney with the "Ram Air" door in the nose, pulled open gained about 2" MP (at) cruise, look at most injected production planes, sucker doors in the inlet somewhere in case filter gets plugged. All sorts of ideas that work excellent. Personally over 25000 hours, still instructing my comment if your air filter freezes over that is the least of your problems, if I recall you can't legally fly in icing conditions anyway, and your wings will shortly lose lift to support you. Be safe live a long life,
Elbie Mendenhall EAA 38308
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#avg_ls_inline_popup{position: absolute;z-index: 9999;padding: 0px 0px;margin-left: 0px;margin-top: 0px;overflow: hidden;word-wrap: break-word;color: black;font-size: 10px;text-align: left;line-height: 130%;} [b]
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pietflyr(at)bellsouth.net
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| Posted: Sun Jan 02, 2011 4:44 pm Post subject: Alternate Air |
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I can sort of chime in here – at least about the reliability of the ring type air filters.
A couple of years ago, a friend with little current tailwheel time had just bought an RV-6. I ferried the plane back home for him and it was tied down at a temporary home on a grass field awaiting completion of his hangar. That fall, a hurricane was approaching and he was out of town. I got a frantic call asking me to fly his plane up to Lakeridge airport in Durham, NC, because Bill “MauleDriver” Watson had enough room in his hangar (along with his Maule and his RV-10 project) to allow the RV-6 to be under shelter. I was to fly the plane to Lakeridge at dawn, and then Bill would take me to work.
I told him I’d be happy to help. The storm was to hit that evening, so the weather should be good enough to fly it there in the morning.
I got to the field before dawn and untied the plane. I pre-flighted it, including removing the cowling cooling inlet plugs (with their flags that draped over the propeller) and the “Remove Before Flight” pitot cover. I started the engine and taxied to the end of the runway where I did a runup. The engine ran normally and I was soon ready to takeoff, with the sky lightening behind me. I announced my departure on 122.9, swung into the wind and began the takeoff roll. It seemed a bit sluggish, but I had noticed it was sluggish when I ferried it – at least compared to my RV-4. I attributed this to the cruise prop it had installed.
I climbed out and set my course for Lakeridge. As I passed through 500’ AGL there was a THUMP that I both heard and felt. I immediately turned back toward the runway behind me, but the engine actually increased its RPM and the airspeed increased by nearly 10 knots. I circled the field to make sure it ws going to continue running before turning again for Lakeridge. Twenty minutes later I was taxiing up to Bill’s hangar, and in the confusion of trying to fit the RV-6 under the wing of his Maule I forgot about the thump.
Later that evening I talked to the owner and remembered the thump. He went to Bill’s as soon as he got back in town and inspected his plane. What he found surprised him (and shocked me). Unbeknownst to me, since the last time I had flown the plane he had added a foam plug for the carburetor air inlet, a plug of black foam rubber and he had not gotten around to adding a “Remove Before Flight” tag for it. I had taken off with the foam plugging the inlet, and the “thump” was the foam getting sucked through the opening and up against the air filter.
Even with that foam plug plastered on the ring-type air filter, the filter prevented the plug from getting into the carburetor (which really would have gotten interesting). The filter still allowed enough air to get through to make for a safe flight.
Rest assured that I have learned from this to do a VERY thorough preflight when flying a strange airplane, particularly when that preflight takes place in the dark. I had a flashlight (which I inadvertantly left in his airplane), but I still didn’t see that black foam plug in the carburetor inlet. Another lesson learned is to NEVER add any sort of cover that needs to be removed before flight without tagging it and making it obvious to any idiot that it must be removed. You never know which idiot might have to fly that plane next – it might be you.
Jack Phillips
#40610 - Wings
Raleigh, NC
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Linn Walters
Sent: Sunday, January 02, 2011 5:13 PM
To: rv10-list(at)matronics.com
Subject: Re: Re: Alternate Air
I'm no expert, but I believe almost all the intake filters on certified aircraft are either a foam or folded filter element that is easily blocked by snow/freezing rain, bird feathers, or just plain dirt, and may be easily have a problem if there wasn't some alternate air source or carb heat.
The ring type of filter we use is far more forgiving of stuff entering the intake and clogging the filter. I just don't see how the whole FAB would fill with enough stuff to cause a problem. With this thread, I have yet to hear from anybody that's had any type of intake malfunction ...... due to clogging ..... unless I just plain missed it.
So, are there any flying -10s out there that have actually had a problem???
Linn
[quote] [b]
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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