REBEL AIR SPEED INDICATOR

Ian Donaldson · Post by **Ian Donaldson** » Fri Feb 17, 2012 10:13 pm

G'day

I was suspicious about the airspeed readings that I was getting, so today I took a GPS along and after flying triangular courses, I have come to the opinion that when the ASI is showing 70k I am in fact doing about 85k. (that's a more reasonable cruise sped)

I have fitted the standard factory supplied pitot on the left wing, and in the position recommended by the factory.

Does any one have any suggestions as to how I can get a more accurate reading!

Thanks and regards

Ian Donaldson

Rick Harper · Post by **Rick Harper** » Fri Feb 17, 2012 10:13 pm

Ian ...

I made my own $1 special ....it hangs UNDER the wing and has both pitot & static tubes on it ....and it works very well ( cross checked against the GPS)

Not much help for your application though ...sorry

Rick

----- Original Message -----
From: Ian Donaldson (allsure@iprimus.com.au)
To: murphy-rebel@dcsol.com (murphy-rebel@dcsol.com)
Sent: Sunday, May 26, 2002 10:48 PM
Subject: REBEL AIR SPEED INDICATOR

G'day

I was suspicious about the airspeed readings that I was getting, so today I took a GPS along and after flying triangular courses, I have come to the opinion that when the ASI is showing 70k I am in fact doing about 85k. (that's a more reasonable cruise sped)

I have fitted the standard factory supplied pitot on the left wing, and in the position recommended by the factory.

Does any one have any suggestions as to how I can get a more accurate reading!

Thanks and regards

Ian Donaldson

Ian Donaldson · Post by **Ian Donaldson** » Fri Feb 17, 2012 10:13 pm

G'day Rick

Thanks for your reply.

I really don't know what the problem is, but I'm sure someone out there will!

How is the planning for the trip to the Rock going?

Regards

Ian

Ian ...

I made my own $1 special ....it hangs UNDER the wing and has both pitot & static tubes on it ....and it works very well ( cross checked against the GPS)

Not much help for your application though ...sorry

Rick

Drew Dalgleish · Post by **Drew Dalgleish** » Fri Feb 17, 2012 10:13 pm

Ian Have you checked to make sure there aren't any leaks in the pitot
line. Just gently blow into the tube while someone else watches the
indicator when it shows about 100k slip your finger over top the tube and
wait the airspeed should stay the same if it doesn't you have a leak.
Drew Dalgleish
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SWSLOANLK · Post by **SWSLOANLK** » Fri Feb 17, 2012 10:13 pm

Ian

Disconnect the static line under the inst. pannel and it will give you a much closer ASI reading. Many small GA aircraft ( Cessna, Piper ) use the cabin air with a small valve for the Alt static source incase the outside port freezes over. I had the same problem as you untill I installed the static port on the side of the aft fuselage.

Steve Sloan 536R

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Rick Harper · Post by **Rick Harper** » Fri Feb 17, 2012 10:13 pm

BLOW VERY GENTLY !!! .... or you will STUFF the Air Speed gauge !

Rick

----- Original Message -----
From: Drew Dalgleish (drewjan@cabletv.on.ca)
To: murphy-rebel@dcsol.com (murphy-rebel@dcsol.com)
Sent: Sunday, May 26, 2002 11:50 PM
Subject: Re: REBEL AIR SPEED INDICATOR

Ian Have you checked to make sure there aren't any leaks in the pitot
line. Just gently blow into the tube while someone else watches the
indicator when it shows about 100k slip your finger over top the tube and
wait the airspeed should stay the same if it doesn't you have a leak.
Drew Dalgleish
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Rick Harper · Post by **Rick Harper** » Fri Feb 17, 2012 10:13 pm

G'day Ian ;

The trip planning is going well :-) ...and we leave in 6 or 7 days YAY !!! .....(depends on the weather )..

We will be in Echuca on the night of the 3rd, (arriving at noonish) & staying at the
Echuca Caravan Park 08 5482 4248 ...on the 4th we fly to Swan Hill (about 10 AM) and then catch a taxi back to Lake Boga as we are doing the Catalina Flying Boat museum tour, then back to Swan Hill and on to Mildura the same day.

If you are able to intercept us at some point , we'd love to have a sticky at your new bird ( and the plane too ! :-)

My mobile is 0416 041 007

Rick

----- Original Message -----
From: Ian Donaldson (allsure@iprimus.com.au)
To: murphy-rebel@dcsol.com (murphy-rebel@dcsol.com)
Sent: Sunday, May 26, 2002 11:08 PM
Subject: Re: REBEL AIR SPEED INDICATOR

G'day Rick

Thanks for your reply.

I really don't know what the problem is, but I'm sure someone out there will!

How is the planning for the trip to the Rock going?

Regards

Ian

Ian ...

I made my own $1 special ....it hangs UNDER the wing and has both pitot & static tubes on it ....and it works very well ( cross checked against the GPS)

Not much help for your application though ...sorry

Rick

Ian Donaldson · Post by **Ian Donaldson** » Fri Feb 17, 2012 10:13 pm

G'day Rick

Well now you must be excited!

Sounds like you will be having some fun.

You just never know, I might be able to extend the 25 mile testing radius to include Echuca.

I hope all goes well for your team. Please post some details as you go.

Regards

Ian Donaldson

PS Thanks for the tip on not blowing too hard into the pitot tube.

Ian Donaldson · Post by **Ian Donaldson** » Fri Feb 17, 2012 10:13 pm

G'day Drew

Thanks for your tip. I will try the system for leaks. Never thought of doing
that!

Regards

Ian Donaldson

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Ian Donaldson · Post by **Ian Donaldson** » Fri Feb 17, 2012 10:13 pm

G'day Steve.

Thanks for the tip. There have been a number of replies to my question and I'm sure that I will get it right.

Thanks and regards

Ian Donaldson